jshint.js

/*! 2.13.4 */
var JSHINT;
if (typeof window === 'undefined') window = {};
(function () {
var require;
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var identifierStartTable = [];

for (var i = 0; i < 128; i++) {
  identifierStartTable[i] =
    i === 36 ||           // $
    i >= 65 && i <= 90 || // A-Z
    i === 95 ||           // _
    i >= 97 && i <= 122;  // a-z
}

var identifierPartTable = [];

for (var i = 0; i < 128; i++) {
  identifierPartTable[i] =
    identifierStartTable[i] || // $, _, A-Z, a-z
    i >= 48 && i <= 57;        // 0-9
}

module.exports = {
  asciiIdentifierStartTable: identifierStartTable,
  asciiIdentifierPartTable: identifierPartTable
};

},{}],2:[function(require,module,exports){
module.exports = 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},{}],3:[function(require,module,exports){
var str = 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var arr = str.split(',').map(function(code) {
  return parseInt(code, 10);
});
module.exports = arr;
},{}],4:[function(require,module,exports){
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932,64933,64934,64935,64936,64937,64938,64939,64940,64941,64942,64943,64944,64945,64946,64947,64948,64949,64950,64951,64952,64953,64954,64955,64956,64957,64958,64959,64960,64961,64962,64963,64964,64965,64966,64967,65008,65009,65010,65011,65012,65013,65014,65015,65016,65017,65018,65019,65136,65137,65138,65139,65140,65142,65143,65144,65145,65146,65147,65148,65149,65150,65151,65152,65153,65154,65155,65156,65157,65158,65159,65160,65161,65162,65163,65164,65165,65166,65167,65168,65169,65170,65171,65172,65173,65174,65175,65176,65177,65178,65179,65180,65181,65182,65183,65184,65185,65186,65187,65188,65189,65190,65191,65192,65193,65194,65195,65196,65197,65198,65199,65200,65201,65202,65203,65204,65205,65206,65207,65208,65209,65210,65211,65212,65213,65214,65215,65216,65217,65218,65219,65220,65221,65222,65223,65224,65225,65226,65227,65228,65229,65230,65231,65232,65233,65234,65235,65236,65237,65238,65239,65240,65241,65242,65243,65244,65245,65246,65247,65248,65249,65250,65251,65252,65253,65254,65255,65256,65257,65258,65259,65260,65261,65262,65263,65264,65265,65266,65267,65268,65269,65270,65271,65272,65273,65274,65275,65276,65313,65314,65315,65316,65317,65318,65319,65320,65321,65322,65323,65324,65325,65326,65327,65328,65329,65330,65331,65332,65333,65334,65335,65336,65337,65338,65345,65346,65347,65348,65349,65350,65351,65352,65353,65354,65355,65356,65357,65358,65359,65360,65361,65362,65363,65364,65365,65366,65367,65368,65369,65370,65382,65383,65384,65385,65386,65387,65388,65389,65390,65391,65392,65393,65394,65395,65396,65397,65398,65399,65400,65401,65402,65403,65404,65405,65406,65407,65408,65409,65410,65411,65412,65413,65414,65415,65416,65417,65418,65419,65420,65421,65422,65423,65424,65425,65426,65427,65428,65429,65430,65431,65432,65433,65434,65435,65436,65437,65438,65439,65440,65441,65442,65443,65444,65445,65446,65447,65448,65449,65450,65451,65452,65453,65454,65455,65456,65457,65458,65459,65460,65461,65462,65463,65464,65465,65466,65467,65468,65469,65470,65474,65475,65476,65477,65478,65479,65482,65483,65484,65485,65486,65487,65490,65491,65492,65493,65494,65495,65498,65499,65500';
var arr = str.split(',').map(function(code) {
  return parseInt(code, 10);
});
module.exports = arr;
},{}],5:[function(require,module,exports){
// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
//
// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
//
// Originally from narwhal.js (http://narwhaljs.org)
// Copyright (c) 2009 Thomas Robinson <280north.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the 'Software'), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// when used in node, this will actually load the util module we depend on
// versus loading the builtin util module as happens otherwise
// this is a bug in node module loading as far as I am concerned
var util = require('util/');

var pSlice = Array.prototype.slice;
var hasOwn = Object.prototype.hasOwnProperty;

// 1. The assert module provides functions that throw
// AssertionError's when particular conditions are not met. The
// assert module must conform to the following interface.

var assert = module.exports = ok;

// 2. The AssertionError is defined in assert.
// new assert.AssertionError({ message: message,
//                             actual: actual,
//                             expected: expected })

assert.AssertionError = function AssertionError(options) {
  this.name = 'AssertionError';
  this.actual = options.actual;
  this.expected = options.expected;
  this.operator = options.operator;
  if (options.message) {
    this.message = options.message;
    this.generatedMessage = false;
  } else {
    this.message = getMessage(this);
    this.generatedMessage = true;
  }
  var stackStartFunction = options.stackStartFunction || fail;

  if (Error.captureStackTrace) {
    Error.captureStackTrace(this, stackStartFunction);
  }
  else {
    // non v8 browsers so we can have a stacktrace
    var err = new Error();
    if (err.stack) {
      var out = err.stack;

      // try to strip useless frames
      var fn_name = stackStartFunction.name;
      var idx = out.indexOf('\n' + fn_name);
      if (idx >= 0) {
        // once we have located the function frame
        // we need to strip out everything before it (and its line)
        var next_line = out.indexOf('\n', idx + 1);
        out = out.substring(next_line + 1);
      }

      this.stack = out;
    }
  }
};

// assert.AssertionError instanceof Error
util.inherits(assert.AssertionError, Error);

function replacer(key, value) {
  if (util.isUndefined(value)) {
    return '' + value;
  }
  if (util.isNumber(value) && !isFinite(value)) {
    return value.toString();
  }
  if (util.isFunction(value) || util.isRegExp(value)) {
    return value.toString();
  }
  return value;
}

function truncate(s, n) {
  if (util.isString(s)) {
    return s.length < n ? s : s.slice(0, n);
  } else {
    return s;
  }
}

function getMessage(self) {
  return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
         self.operator + ' ' +
         truncate(JSON.stringify(self.expected, replacer), 128);
}

// At present only the three keys mentioned above are used and
// understood by the spec. Implementations or sub modules can pass
// other keys to the AssertionError's constructor - they will be
// ignored.

// 3. All of the following functions must throw an AssertionError
// when a corresponding condition is not met, with a message that
// may be undefined if not provided.  All assertion methods provide
// both the actual and expected values to the assertion error for
// display purposes.

function fail(actual, expected, message, operator, stackStartFunction) {
  throw new assert.AssertionError({
    message: message,
    actual: actual,
    expected: expected,
    operator: operator,
    stackStartFunction: stackStartFunction
  });
}

// EXTENSION! allows for well behaved errors defined elsewhere.
assert.fail = fail;

// 4. Pure assertion tests whether a value is truthy, as determined
// by !!guard.
// assert.ok(guard, message_opt);
// This statement is equivalent to assert.equal(true, !!guard,
// message_opt);. To test strictly for the value true, use
// assert.strictEqual(true, guard, message_opt);.

function ok(value, message) {
  if (!value) fail(value, true, message, '==', assert.ok);
}
assert.ok = ok;

// 5. The equality assertion tests shallow, coercive equality with
// ==.
// assert.equal(actual, expected, message_opt);

assert.equal = function equal(actual, expected, message) {
  if (actual != expected) fail(actual, expected, message, '==', assert.equal);
};

// 6. The non-equality assertion tests for whether two objects are not equal
// with != assert.notEqual(actual, expected, message_opt);

assert.notEqual = function notEqual(actual, expected, message) {
  if (actual == expected) {
    fail(actual, expected, message, '!=', assert.notEqual);
  }
};

// 7. The equivalence assertion tests a deep equality relation.
// assert.deepEqual(actual, expected, message_opt);

assert.deepEqual = function deepEqual(actual, expected, message) {
  if (!_deepEqual(actual, expected)) {
    fail(actual, expected, message, 'deepEqual', assert.deepEqual);
  }
};

function _deepEqual(actual, expected) {
  // 7.1. All identical values are equivalent, as determined by ===.
  if (actual === expected) {
    return true;

  } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
    if (actual.length != expected.length) return false;

    for (var i = 0; i < actual.length; i++) {
      if (actual[i] !== expected[i]) return false;
    }

    return true;

  // 7.2. If the expected value is a Date object, the actual value is
  // equivalent if it is also a Date object that refers to the same time.
  } else if (util.isDate(actual) && util.isDate(expected)) {
    return actual.getTime() === expected.getTime();

  // 7.3 If the expected value is a RegExp object, the actual value is
  // equivalent if it is also a RegExp object with the same source and
  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
  } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
    return actual.source === expected.source &&
           actual.global === expected.global &&
           actual.multiline === expected.multiline &&
           actual.lastIndex === expected.lastIndex &&
           actual.ignoreCase === expected.ignoreCase;

  // 7.4. Other pairs that do not both pass typeof value == 'object',
  // equivalence is determined by ==.
  } else if (!util.isObject(actual) && !util.isObject(expected)) {
    return actual == expected;

  // 7.5 For all other Object pairs, including Array objects, equivalence is
  // determined by having the same number of owned properties (as verified
  // with Object.prototype.hasOwnProperty.call), the same set of keys
  // (although not necessarily the same order), equivalent values for every
  // corresponding key, and an identical 'prototype' property. Note: this
  // accounts for both named and indexed properties on Arrays.
  } else {
    return objEquiv(actual, expected);
  }
}

function isArguments(object) {
  return Object.prototype.toString.call(object) == '[object Arguments]';
}

function objEquiv(a, b) {
  if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
    return false;
  // an identical 'prototype' property.
  if (a.prototype !== b.prototype) return false;
  // if one is a primitive, the other must be same
  if (util.isPrimitive(a) || util.isPrimitive(b)) {
    return a === b;
  }
  var aIsArgs = isArguments(a),
      bIsArgs = isArguments(b);
  if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
    return false;
  if (aIsArgs) {
    a = pSlice.call(a);
    b = pSlice.call(b);
    return _deepEqual(a, b);
  }
  var ka = objectKeys(a),
      kb = objectKeys(b),
      key, i;
  // having the same number of owned properties (keys incorporates
  // hasOwnProperty)
  if (ka.length != kb.length)
    return false;
  //the same set of keys (although not necessarily the same order),
  ka.sort();
  kb.sort();
  //~~~cheap key test
  for (i = ka.length - 1; i >= 0; i--) {
    if (ka[i] != kb[i])
      return false;
  }
  //equivalent values for every corresponding key, and
  //~~~possibly expensive deep test
  for (i = ka.length - 1; i >= 0; i--) {
    key = ka[i];
    if (!_deepEqual(a[key], b[key])) return false;
  }
  return true;
}

// 8. The non-equivalence assertion tests for any deep inequality.
// assert.notDeepEqual(actual, expected, message_opt);

assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
  if (_deepEqual(actual, expected)) {
    fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
  }
};

// 9. The strict equality assertion tests strict equality, as determined by ===.
// assert.strictEqual(actual, expected, message_opt);

assert.strictEqual = function strictEqual(actual, expected, message) {
  if (actual !== expected) {
    fail(actual, expected, message, '===', assert.strictEqual);
  }
};

// 10. The strict non-equality assertion tests for strict inequality, as
// determined by !==.  assert.notStrictEqual(actual, expected, message_opt);

assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
  if (actual === expected) {
    fail(actual, expected, message, '!==', assert.notStrictEqual);
  }
};

function expectedException(actual, expected) {
  if (!actual || !expected) {
    return false;
  }

  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
    return expected.test(actual);
  } else if (actual instanceof expected) {
    return true;
  } else if (expected.call({}, actual) === true) {
    return true;
  }

  return false;
}

function _throws(shouldThrow, block, expected, message) {
  var actual;

  if (util.isString(expected)) {
    message = expected;
    expected = null;
  }

  try {
    block();
  } catch (e) {
    actual = e;
  }

  message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
            (message ? ' ' + message : '.');

  if (shouldThrow && !actual) {
    fail(actual, expected, 'Missing expected exception' + message);
  }

  if (!shouldThrow && expectedException(actual, expected)) {
    fail(actual, expected, 'Got unwanted exception' + message);
  }

  if ((shouldThrow && actual && expected &&
      !expectedException(actual, expected)) || (!shouldThrow && actual)) {
    throw actual;
  }
}

// 11. Expected to throw an error:
// assert.throws(block, Error_opt, message_opt);

assert.throws = function(block, /*optional*/error, /*optional*/message) {
  _throws.apply(this, [true].concat(pSlice.call(arguments)));
};

// EXTENSION! This is annoying to write outside this module.
assert.doesNotThrow = function(block, /*optional*/message) {
  _throws.apply(this, [false].concat(pSlice.call(arguments)));
};

assert.ifError = function(err) { if (err) {throw err;}};

var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) {
    if (hasOwn.call(obj, key)) keys.push(key);
  }
  return keys;
};

},{"util/":8}],6:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],7:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],8:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = require('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":7,"_process":13,"inherits":6}],9:[function(require,module,exports){
(function (global){
/*global window, global*/
var util = require("util")
var assert = require("assert")
var now = require("date-now")

var slice = Array.prototype.slice
var console
var times = {}

if (typeof global !== "undefined" && global.console) {
    console = global.console
} else if (typeof window !== "undefined" && window.console) {
    console = window.console
} else {
    console = {}
}

var functions = [
    [log, "log"],
    [info, "info"],
    [warn, "warn"],
    [error, "error"],
    [time, "time"],
    [timeEnd, "timeEnd"],
    [trace, "trace"],
    [dir, "dir"],
    [consoleAssert, "assert"]
]

for (var i = 0; i < functions.length; i++) {
    var tuple = functions[i]
    var f = tuple[0]
    var name = tuple[1]

    if (!console[name]) {
        console[name] = f
    }
}

module.exports = console

function log() {}

function info() {
    console.log.apply(console, arguments)
}

function warn() {
    console.log.apply(console, arguments)
}

function error() {
    console.warn.apply(console, arguments)
}

function time(label) {
    times[label] = now()
}

function timeEnd(label) {
    var time = times[label]
    if (!time) {
        throw new Error("No such label: " + label)
    }

    var duration = now() - time
    console.log(label + ": " + duration + "ms")
}

function trace() {
    var err = new Error()
    err.name = "Trace"
    err.message = util.format.apply(null, arguments)
    console.error(err.stack)
}

function dir(object) {
    console.log(util.inspect(object) + "\n")
}

function consoleAssert(expression) {
    if (!expression) {
        var arr = slice.call(arguments, 1)
        assert.ok(false, util.format.apply(null, arr))
    }
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"assert":5,"date-now":10,"util":16}],10:[function(require,module,exports){
module.exports = now

function now() {
    return new Date().getTime()
}

},{}],11:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      }
      throw TypeError('Uncaught, unspecified "error" event.');
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    len = arguments.length;
    args = new Array(len - 1);
    for (i = 1; i < len; i++)
      args[i - 1] = arguments[i];

    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    var m;
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  var ret;
  if (!emitter._events || !emitter._events[type])
    ret = 0;
  else if (isFunction(emitter._events[type]))
    ret = 1;
  else
    ret = emitter._events[type].length;
  return ret;
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],12:[function(require,module,exports){
(function (global){
/**
 * @license
 * Lodash <https://lodash.com/>
 * Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
 * Released under MIT license <https://lodash.com/license>
 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
 * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 */
;(function() {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /** Used as the semantic version number. */
  var VERSION = '4.17.21';

  /** Used as the size to enable large array optimizations. */
  var LARGE_ARRAY_SIZE = 200;

  /** Error message constants. */
  var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
      FUNC_ERROR_TEXT = 'Expected a function',
      INVALID_TEMPL_VAR_ERROR_TEXT = 'Invalid `variable` option passed into `_.template`';

  /** Used to stand-in for `undefined` hash values. */
  var HASH_UNDEFINED = '__lodash_hash_undefined__';

  /** Used as the maximum memoize cache size. */
  var MAX_MEMOIZE_SIZE = 500;

  /** Used as the internal argument placeholder. */
  var PLACEHOLDER = '__lodash_placeholder__';

  /** Used to compose bitmasks for cloning. */
  var CLONE_DEEP_FLAG = 1,
      CLONE_FLAT_FLAG = 2,
      CLONE_SYMBOLS_FLAG = 4;

  /** Used to compose bitmasks for value comparisons. */
  var COMPARE_PARTIAL_FLAG = 1,
      COMPARE_UNORDERED_FLAG = 2;

  /** Used to compose bitmasks for function metadata. */
  var WRAP_BIND_FLAG = 1,
      WRAP_BIND_KEY_FLAG = 2,
      WRAP_CURRY_BOUND_FLAG = 4,
      WRAP_CURRY_FLAG = 8,
      WRAP_CURRY_RIGHT_FLAG = 16,
      WRAP_PARTIAL_FLAG = 32,
      WRAP_PARTIAL_RIGHT_FLAG = 64,
      WRAP_ARY_FLAG = 128,
      WRAP_REARG_FLAG = 256,
      WRAP_FLIP_FLAG = 512;

  /** Used as default options for `_.truncate`. */
  var DEFAULT_TRUNC_LENGTH = 30,
      DEFAULT_TRUNC_OMISSION = '...';

  /** Used to detect hot functions by number of calls within a span of milliseconds. */
  var HOT_COUNT = 800,
      HOT_SPAN = 16;

  /** Used to indicate the type of lazy iteratees. */
  var LAZY_FILTER_FLAG = 1,
      LAZY_MAP_FLAG = 2,
      LAZY_WHILE_FLAG = 3;

  /** Used as references for various `Number` constants. */
  var INFINITY = 1 / 0,
      MAX_SAFE_INTEGER = 9007199254740991,
      MAX_INTEGER = 1.7976931348623157e+308,
      NAN = 0 / 0;

  /** Used as references for the maximum length and index of an array. */
  var MAX_ARRAY_LENGTH = 4294967295,
      MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
      HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;

  /** Used to associate wrap methods with their bit flags. */
  var wrapFlags = [
    ['ary', WRAP_ARY_FLAG],
    ['bind', WRAP_BIND_FLAG],
    ['bindKey', WRAP_BIND_KEY_FLAG],
    ['curry', WRAP_CURRY_FLAG],
    ['curryRight', WRAP_CURRY_RIGHT_FLAG],
    ['flip', WRAP_FLIP_FLAG],
    ['partial', WRAP_PARTIAL_FLAG],
    ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
    ['rearg', WRAP_REARG_FLAG]
  ];

  /** `Object#toString` result references. */
  var argsTag = '[object Arguments]',
      arrayTag = '[object Array]',
      asyncTag = '[object AsyncFunction]',
      boolTag = '[object Boolean]',
      dateTag = '[object Date]',
      domExcTag = '[object DOMException]',
      errorTag = '[object Error]',
      funcTag = '[object Function]',
      genTag = '[object GeneratorFunction]',
      mapTag = '[object Map]',
      numberTag = '[object Number]',
      nullTag = '[object Null]',
      objectTag = '[object Object]',
      promiseTag = '[object Promise]',
      proxyTag = '[object Proxy]',
      regexpTag = '[object RegExp]',
      setTag = '[object Set]',
      stringTag = '[object String]',
      symbolTag = '[object Symbol]',
      undefinedTag = '[object Undefined]',
      weakMapTag = '[object WeakMap]',
      weakSetTag = '[object WeakSet]';

  var arrayBufferTag = '[object ArrayBuffer]',
      dataViewTag = '[object DataView]',
      float32Tag = '[object Float32Array]',
      float64Tag = '[object Float64Array]',
      int8Tag = '[object Int8Array]',
      int16Tag = '[object Int16Array]',
      int32Tag = '[object Int32Array]',
      uint8Tag = '[object Uint8Array]',
      uint8ClampedTag = '[object Uint8ClampedArray]',
      uint16Tag = '[object Uint16Array]',
      uint32Tag = '[object Uint32Array]';

  /** Used to match empty string literals in compiled template source. */
  var reEmptyStringLeading = /\b__p \+= '';/g,
      reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
      reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;

  /** Used to match HTML entities and HTML characters. */
  var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
      reUnescapedHtml = /[&<>"']/g,
      reHasEscapedHtml = RegExp(reEscapedHtml.source),
      reHasUnescapedHtml = RegExp(reUnescapedHtml.source);

  /** Used to match template delimiters. */
  var reEscape = /<%-([\s\S]+?)%>/g,
      reEvaluate = /<%([\s\S]+?)%>/g,
      reInterpolate = /<%=([\s\S]+?)%>/g;

  /** Used to match property names within property paths. */
  var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
      reIsPlainProp = /^\w*$/,
      rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;

  /**
   * Used to match `RegExp`
   * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
   */
  var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
      reHasRegExpChar = RegExp(reRegExpChar.source);

  /** Used to match leading whitespace. */
  var reTrimStart = /^\s+/;

  /** Used to match a single whitespace character. */
  var reWhitespace = /\s/;

  /** Used to match wrap detail comments. */
  var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
      reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
      reSplitDetails = /,? & /;

  /** Used to match words composed of alphanumeric characters. */
  var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;

  /**
   * Used to validate the `validate` option in `_.template` variable.
   *
   * Forbids characters which could potentially change the meaning of the function argument definition:
   * - "()," (modification of function parameters)
   * - "=" (default value)
   * - "[]{}" (destructuring of function parameters)
   * - "/" (beginning of a comment)
   * - whitespace
   */
  var reForbiddenIdentifierChars = /[()=,{}\[\]\/\s]/;

  /** Used to match backslashes in property paths. */
  var reEscapeChar = /\\(\\)?/g;

  /**
   * Used to match
   * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
   */
  var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;

  /** Used to match `RegExp` flags from their coerced string values. */
  var reFlags = /\w*$/;

  /** Used to detect bad signed hexadecimal string values. */
  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;

  /** Used to detect binary string values. */
  var reIsBinary = /^0b[01]+$/i;

  /** Used to detect host constructors (Safari). */
  var reIsHostCtor = /^\[object .+?Constructor\]$/;

  /** Used to detect octal string values. */
  var reIsOctal = /^0o[0-7]+$/i;

  /** Used to detect unsigned integer values. */
  var reIsUint = /^(?:0|[1-9]\d*)$/;

  /** Used to match Latin Unicode letters (excluding mathematical operators). */
  var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;

  /** Used to ensure capturing order of template delimiters. */
  var reNoMatch = /($^)/;

  /** Used to match unescaped characters in compiled string literals. */
  var reUnescapedString = /['\n\r\u2028\u2029\\]/g;

  /** Used to compose unicode character classes. */
  var rsAstralRange = '\\ud800-\\udfff',
      rsComboMarksRange = '\\u0300-\\u036f',
      reComboHalfMarksRange = '\\ufe20-\\ufe2f',
      rsComboSymbolsRange = '\\u20d0-\\u20ff',
      rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
      rsDingbatRange = '\\u2700-\\u27bf',
      rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
      rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
      rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
      rsPunctuationRange = '\\u2000-\\u206f',
      rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
      rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
      rsVarRange = '\\ufe0e\\ufe0f',
      rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;

  /** Used to compose unicode capture groups. */
  var rsApos = "['\u2019]",
      rsAstral = '[' + rsAstralRange + ']',
      rsBreak = '[' + rsBreakRange + ']',
      rsCombo = '[' + rsComboRange + ']',
      rsDigits = '\\d+',
      rsDingbat = '[' + rsDingbatRange + ']',
      rsLower = '[' + rsLowerRange + ']',
      rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
      rsFitz = '\\ud83c[\\udffb-\\udfff]',
      rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
      rsNonAstral = '[^' + rsAstralRange + ']',
      rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
      rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
      rsUpper = '[' + rsUpperRange + ']',
      rsZWJ = '\\u200d';

  /** Used to compose unicode regexes. */
  var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
      rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
      rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
      rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
      reOptMod = rsModifier + '?',
      rsOptVar = '[' + rsVarRange + ']?',
      rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
      rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
      rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
      rsSeq = rsOptVar + reOptMod + rsOptJoin,
      rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
      rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';

  /** Used to match apostrophes. */
  var reApos = RegExp(rsApos, 'g');

  /**
   * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
   * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
   */
  var reComboMark = RegExp(rsCombo, 'g');

  /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
  var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');

  /** Used to match complex or compound words. */
  var reUnicodeWord = RegExp([
    rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
    rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
    rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
    rsUpper + '+' + rsOptContrUpper,
    rsOrdUpper,
    rsOrdLower,
    rsDigits,
    rsEmoji
  ].join('|'), 'g');

  /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
  var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');

  /** Used to detect strings that need a more robust regexp to match words. */
  var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;

  /** Used to assign default `context` object properties. */
  var contextProps = [
    'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
    'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
    'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
    '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
  ];

  /** Used to make template sourceURLs easier to identify. */
  var templateCounter = -1;

  /** Used to identify `toStringTag` values of typed arrays. */
  var typedArrayTags = {};
  typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
  typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
  typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
  typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
  typedArrayTags[uint32Tag] = true;
  typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
  typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
  typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
  typedArrayTags[errorTag] = typedArrayTags[funcTag] =
  typedArrayTags[mapTag] = typedArrayTags[numberTag] =
  typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
  typedArrayTags[setTag] = typedArrayTags[stringTag] =
  typedArrayTags[weakMapTag] = false;

  /** Used to identify `toStringTag` values supported by `_.clone`. */
  var cloneableTags = {};
  cloneableTags[argsTag] = cloneableTags[arrayTag] =
  cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
  cloneableTags[boolTag] = cloneableTags[dateTag] =
  cloneableTags[float32Tag] = cloneableTags[float64Tag] =
  cloneableTags[int8Tag] = cloneableTags[int16Tag] =
  cloneableTags[int32Tag] = cloneableTags[mapTag] =
  cloneableTags[numberTag] = cloneableTags[objectTag] =
  cloneableTags[regexpTag] = cloneableTags[setTag] =
  cloneableTags[stringTag] = cloneableTags[symbolTag] =
  cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
  cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
  cloneableTags[errorTag] = cloneableTags[funcTag] =
  cloneableTags[weakMapTag] = false;

  /** Used to map Latin Unicode letters to basic Latin letters. */
  var deburredLetters = {
    // Latin-1 Supplement block.
    '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
    '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
    '\xc7': 'C',  '\xe7': 'c',
    '\xd0': 'D',  '\xf0': 'd',
    '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
    '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
    '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
    '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
    '\xd1': 'N',  '\xf1': 'n',
    '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
    '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
    '\xd9': 'U',  '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
    '\xf9': 'u',  '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
    '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
    '\xc6': 'Ae', '\xe6': 'ae',
    '\xde': 'Th', '\xfe': 'th',
    '\xdf': 'ss',
    // Latin Extended-A block.
    '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
    '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
    '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
    '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
    '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
    '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
    '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
    '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
    '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
    '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
    '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
    '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
    '\u0134': 'J',  '\u0135': 'j',
    '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
    '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
    '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
    '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
    '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
    '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
    '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
    '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
    '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
    '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
    '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
    '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
    '\u0163': 't',  '\u0165': 't', '\u0167': 't',
    '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
    '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
    '\u0174': 'W',  '\u0175': 'w',
    '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
    '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
    '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
    '\u0132': 'IJ', '\u0133': 'ij',
    '\u0152': 'Oe', '\u0153': 'oe',
    '\u0149': "'n", '\u017f': 's'
  };

  /** Used to map characters to HTML entities. */
  var htmlEscapes = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#39;'
  };

  /** Used to map HTML entities to characters. */
  var htmlUnescapes = {
    '&amp;': '&',
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&#39;': "'"
  };

  /** Used to escape characters for inclusion in compiled string literals. */
  var stringEscapes = {
    '\\': '\\',
    "'": "'",
    '\n': 'n',
    '\r': 'r',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  /** Built-in method references without a dependency on `root`. */
  var freeParseFloat = parseFloat,
      freeParseInt = parseInt;

  /** Detect free variable `global` from Node.js. */
  var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;

  /** Detect free variable `self`. */
  var freeSelf = typeof self == 'object' && self && self.Object === Object && self;

  /** Used as a reference to the global object. */
  var root = freeGlobal || freeSelf || Function('return this')();

  /** Detect free variable `exports`. */
  var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;

  /** Detect free variable `module`. */
  var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;

  /** Detect the popular CommonJS extension `module.exports`. */
  var moduleExports = freeModule && freeModule.exports === freeExports;

  /** Detect free variable `process` from Node.js. */
  var freeProcess = moduleExports && freeGlobal.process;

  /** Used to access faster Node.js helpers. */
  var nodeUtil = (function() {
    try {
      // Use `util.types` for Node.js 10+.
      var types = freeModule && freeModule.require && freeModule.require('util').types;

      if (types) {
        return types;
      }

      // Legacy `process.binding('util')` for Node.js < 10.
      return freeProcess && freeProcess.binding && freeProcess.binding('util');
    } catch (e) {}
  }());

  /* Node.js helper references. */
  var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
      nodeIsDate = nodeUtil && nodeUtil.isDate,
      nodeIsMap = nodeUtil && nodeUtil.isMap,
      nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
      nodeIsSet = nodeUtil && nodeUtil.isSet,
      nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;

  /*--------------------------------------------------------------------------*/

  /**
   * A faster alternative to `Function#apply`, this function invokes `func`
   * with the `this` binding of `thisArg` and the arguments of `args`.
   *
   * @private
   * @param {Function} func The function to invoke.
   * @param {*} thisArg The `this` binding of `func`.
   * @param {Array} args The arguments to invoke `func` with.
   * @returns {*} Returns the result of `func`.
   */
  function apply(func, thisArg, args) {
    switch (args.length) {
      case 0: return func.call(thisArg);
      case 1: return func.call(thisArg, args[0]);
      case 2: return func.call(thisArg, args[0], args[1]);
      case 3: return func.call(thisArg, args[0], args[1], args[2]);
    }
    return func.apply(thisArg, args);
  }

  /**
   * A specialized version of `baseAggregator` for arrays.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} setter The function to set `accumulator` values.
   * @param {Function} iteratee The iteratee to transform keys.
   * @param {Object} accumulator The initial aggregated object.
   * @returns {Function} Returns `accumulator`.
   */
  function arrayAggregator(array, setter, iteratee, accumulator) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index < length) {
      var value = array[index];
      setter(accumulator, value, iteratee(value), array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.forEach` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns `array`.
   */
  function arrayEach(array, iteratee) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index < length) {
      if (iteratee(array[index], index, array) === false) {
        break;
      }
    }
    return array;
  }

  /**
   * A specialized version of `_.forEachRight` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns `array`.
   */
  function arrayEachRight(array, iteratee) {
    var length = array == null ? 0 : array.length;

    while (length--) {
      if (iteratee(array[length], length, array) === false) {
        break;
      }
    }
    return array;
  }

  /**
   * A specialized version of `_.every` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {boolean} Returns `true` if all elements pass the predicate check,
   *  else `false`.
   */
  function arrayEvery(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index < length) {
      if (!predicate(array[index], index, array)) {
        return false;
      }
    }
    return true;
  }

  /**
   * A specialized version of `_.filter` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {Array} Returns the new filtered array.
   */
  function arrayFilter(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length,
        resIndex = 0,
        result = [];

    while (++index < length) {
      var value = array[index];
      if (predicate(value, index, array)) {
        result[resIndex++] = value;
      }
    }
    return result;
  }

  /**
   * A specialized version of `_.includes` for arrays without support for
   * specifying an index to search from.
   *
   * @private
   * @param {Array} [array] The array to inspect.
   * @param {*} target The value to search for.
   * @returns {boolean} Returns `true` if `target` is found, else `false`.
   */
  function arrayIncludes(array, value) {
    var length = array == null ? 0 : array.length;
    return !!length && baseIndexOf(array, value, 0) > -1;
  }

  /**
   * This function is like `arrayIncludes` except that it accepts a comparator.
   *
   * @private
   * @param {Array} [array] The array to inspect.
   * @param {*} target The value to search for.
   * @param {Function} comparator The comparator invoked per element.
   * @returns {boolean} Returns `true` if `target` is found, else `false`.
   */
  function arrayIncludesWith(array, value, comparator) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index < length) {
      if (comparator(value, array[index])) {
        return true;
      }
    }
    return false;
  }

  /**
   * A specialized version of `_.map` for arrays without support for iteratee
   * shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns the new mapped array.
   */
  function arrayMap(array, iteratee) {
    var index = -1,
        length = array == null ? 0 : array.length,
        result = Array(length);

    while (++index < length) {
      result[index] = iteratee(array[index], index, array);
    }
    return result;
  }

  /**
   * Appends the elements of `values` to `array`.
   *
   * @private
   * @param {Array} array The array to modify.
   * @param {Array} values The values to append.
   * @returns {Array} Returns `array`.
   */
  function arrayPush(array, values) {
    var index = -1,
        length = values.length,
        offset = array.length;

    while (++index < length) {
      array[offset + index] = values[index];
    }
    return array;
  }

  /**
   * A specialized version of `_.reduce` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} [accumulator] The initial value.
   * @param {boolean} [initAccum] Specify using the first element of `array` as
   *  the initial value.
   * @returns {*} Returns the accumulated value.
   */
  function arrayReduce(array, iteratee, accumulator, initAccum) {
    var index = -1,
        length = array == null ? 0 : array.length;

    if (initAccum && length) {
      accumulator = array[++index];
    }
    while (++index < length) {
      accumulator = iteratee(accumulator, array[index], index, array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.reduceRight` for arrays without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} [accumulator] The initial value.
   * @param {boolean} [initAccum] Specify using the last element of `array` as
   *  the initial value.
   * @returns {*} Returns the accumulated value.
   */
  function arrayReduceRight(array, iteratee, accumulator, initAccum) {
    var length = array == null ? 0 : array.length;
    if (initAccum && length) {
      accumulator = array[--length];
    }
    while (length--) {
      accumulator = iteratee(accumulator, array[length], length, array);
    }
    return accumulator;
  }

  /**
   * A specialized version of `_.some` for arrays without support for iteratee
   * shorthands.
   *
   * @private
   * @param {Array} [array] The array to iterate over.
   * @param {Function} predicate The function invoked per iteration.
   * @returns {boolean} Returns `true` if any element passes the predicate check,
   *  else `false`.
   */
  function arraySome(array, predicate) {
    var index = -1,
        length = array == null ? 0 : array.length;

    while (++index < length) {
      if (predicate(array[index], index, array)) {
        return true;
      }
    }
    return false;
  }

  /**
   * Gets the size of an ASCII `string`.
   *
   * @private
   * @param {string} string The string inspect.
   * @returns {number} Returns the string size.
   */
  var asciiSize = baseProperty('length');

  /**
   * Converts an ASCII `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function asciiToArray(string) {
    return string.split('');
  }

  /**
   * Splits an ASCII `string` into an array of its words.
   *
   * @private
   * @param {string} The string to inspect.
   * @returns {Array} Returns the words of `string`.
   */
  function asciiWords(string) {
    return string.match(reAsciiWord) || [];
  }

  /**
   * The base implementation of methods like `_.findKey` and `_.findLastKey`,
   * without support for iteratee shorthands, which iterates over `collection`
   * using `eachFunc`.
   *
   * @private
   * @param {Array|Object} collection The collection to inspect.
   * @param {Function} predicate The function invoked per iteration.
   * @param {Function} eachFunc The function to iterate over `collection`.
   * @returns {*} Returns the found element or its key, else `undefined`.
   */
  function baseFindKey(collection, predicate, eachFunc) {
    var result;
    eachFunc(collection, function(value, key, collection) {
      if (predicate(value, key, collection)) {
        result = key;
        return false;
      }
    });
    return result;
  }

  /**
   * The base implementation of `_.findIndex` and `_.findLastIndex` without
   * support for iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {Function} predicate The function invoked per iteration.
   * @param {number} fromIndex The index to search from.
   * @param {boolean} [fromRight] Specify iterating from right to left.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseFindIndex(array, predicate, fromIndex, fromRight) {
    var length = array.length,
        index = fromIndex + (fromRight ? 1 : -1);

    while ((fromRight ? index-- : ++index < length)) {
      if (predicate(array[index], index, array)) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseIndexOf(array, value, fromIndex) {
    return value === value
      ? strictIndexOf(array, value, fromIndex)
      : baseFindIndex(array, baseIsNaN, fromIndex);
  }

  /**
   * This function is like `baseIndexOf` except that it accepts a comparator.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @param {Function} comparator The comparator invoked per element.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function baseIndexOfWith(array, value, fromIndex, comparator) {
    var index = fromIndex - 1,
        length = array.length;

    while (++index < length) {
      if (comparator(array[index], value)) {
        return index;
      }
    }
    return -1;
  }

  /**
   * The base implementation of `_.isNaN` without support for number objects.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
   */
  function baseIsNaN(value) {
    return value !== value;
  }

  /**
   * The base implementation of `_.mean` and `_.meanBy` without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {number} Returns the mean.
   */
  function baseMean(array, iteratee) {
    var length = array == null ? 0 : array.length;
    return length ? (baseSum(array, iteratee) / length) : NAN;
  }

  /**
   * The base implementation of `_.property` without support for deep paths.
   *
   * @private
   * @param {string} key The key of the property to get.
   * @returns {Function} Returns the new accessor function.
   */
  function baseProperty(key) {
    return function(object) {
      return object == null ? undefined : object[key];
    };
  }

  /**
   * The base implementation of `_.propertyOf` without support for deep paths.
   *
   * @private
   * @param {Object} object The object to query.
   * @returns {Function} Returns the new accessor function.
   */
  function basePropertyOf(object) {
    return function(key) {
      return object == null ? undefined : object[key];
    };
  }

  /**
   * The base implementation of `_.reduce` and `_.reduceRight`, without support
   * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
   *
   * @private
   * @param {Array|Object} collection The collection to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @param {*} accumulator The initial value.
   * @param {boolean} initAccum Specify using the first or last element of
   *  `collection` as the initial value.
   * @param {Function} eachFunc The function to iterate over `collection`.
   * @returns {*} Returns the accumulated value.
   */
  function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
    eachFunc(collection, function(value, index, collection) {
      accumulator = initAccum
        ? (initAccum = false, value)
        : iteratee(accumulator, value, index, collection);
    });
    return accumulator;
  }

  /**
   * The base implementation of `_.sortBy` which uses `comparer` to define the
   * sort order of `array` and replaces criteria objects with their corresponding
   * values.
   *
   * @private
   * @param {Array} array The array to sort.
   * @param {Function} comparer The function to define sort order.
   * @returns {Array} Returns `array`.
   */
  function baseSortBy(array, comparer) {
    var length = array.length;

    array.sort(comparer);
    while (length--) {
      array[length] = array[length].value;
    }
    return array;
  }

  /**
   * The base implementation of `_.sum` and `_.sumBy` without support for
   * iteratee shorthands.
   *
   * @private
   * @param {Array} array The array to iterate over.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {number} Returns the sum.
   */
  function baseSum(array, iteratee) {
    var result,
        index = -1,
        length = array.length;

    while (++index < length) {
      var current = iteratee(array[index]);
      if (current !== undefined) {
        result = result === undefined ? current : (result + current);
      }
    }
    return result;
  }

  /**
   * The base implementation of `_.times` without support for iteratee shorthands
   * or max array length checks.
   *
   * @private
   * @param {number} n The number of times to invoke `iteratee`.
   * @param {Function} iteratee The function invoked per iteration.
   * @returns {Array} Returns the array of results.
   */
  function baseTimes(n, iteratee) {
    var index = -1,
        result = Array(n);

    while (++index < n) {
      result[index] = iteratee(index);
    }
    return result;
  }

  /**
   * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
   * of key-value pairs for `object` corresponding to the property names of `props`.
   *
   * @private
   * @param {Object} object The object to query.
   * @param {Array} props The property names to get values for.
   * @returns {Object} Returns the key-value pairs.
   */
  function baseToPairs(object, props) {
    return arrayMap(props, function(key) {
      return [key, object[key]];
    });
  }

  /**
   * The base implementation of `_.trim`.
   *
   * @private
   * @param {string} string The string to trim.
   * @returns {string} Returns the trimmed string.
   */
  function baseTrim(string) {
    return string
      ? string.slice(0, trimmedEndIndex(string) + 1).replace(reTrimStart, '')
      : string;
  }

  /**
   * The base implementation of `_.unary` without support for storing metadata.
   *
   * @private
   * @param {Function} func The function to cap arguments for.
   * @returns {Function} Returns the new capped function.
   */
  function baseUnary(func) {
    return function(value) {
      return func(value);
    };
  }

  /**
   * The base implementation of `_.values` and `_.valuesIn` which creates an
   * array of `object` property values corresponding to the property names
   * of `props`.
   *
   * @private
   * @param {Object} object The object to query.
   * @param {Array} props The property names to get values for.
   * @returns {Object} Returns the array of property values.
   */
  function baseValues(object, props) {
    return arrayMap(props, function(key) {
      return object[key];
    });
  }

  /**
   * Checks if a `cache` value for `key` exists.
   *
   * @private
   * @param {Object} cache The cache to query.
   * @param {string} key The key of the entry to check.
   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
   */
  function cacheHas(cache, key) {
    return cache.has(key);
  }

  /**
   * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
   * that is not found in the character symbols.
   *
   * @private
   * @param {Array} strSymbols The string symbols to inspect.
   * @param {Array} chrSymbols The character symbols to find.
   * @returns {number} Returns the index of the first unmatched string symbol.
   */
  function charsStartIndex(strSymbols, chrSymbols) {
    var index = -1,
        length = strSymbols.length;

    while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
    return index;
  }

  /**
   * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
   * that is not found in the character symbols.
   *
   * @private
   * @param {Array} strSymbols The string symbols to inspect.
   * @param {Array} chrSymbols The character symbols to find.
   * @returns {number} Returns the index of the last unmatched string symbol.
   */
  function charsEndIndex(strSymbols, chrSymbols) {
    var index = strSymbols.length;

    while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
    return index;
  }

  /**
   * Gets the number of `placeholder` occurrences in `array`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} placeholder The placeholder to search for.
   * @returns {number} Returns the placeholder count.
   */
  function countHolders(array, placeholder) {
    var length = array.length,
        result = 0;

    while (length--) {
      if (array[length] === placeholder) {
        ++result;
      }
    }
    return result;
  }

  /**
   * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
   * letters to basic Latin letters.
   *
   * @private
   * @param {string} letter The matched letter to deburr.
   * @returns {string} Returns the deburred letter.
   */
  var deburrLetter = basePropertyOf(deburredLetters);

  /**
   * Used by `_.escape` to convert characters to HTML entities.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  var escapeHtmlChar = basePropertyOf(htmlEscapes);

  /**
   * Used by `_.template` to escape characters for inclusion in compiled string literals.
   *
   * @private
   * @param {string} chr The matched character to escape.
   * @returns {string} Returns the escaped character.
   */
  function escapeStringChar(chr) {
    return '\\' + stringEscapes[chr];
  }

  /**
   * Gets the value at `key` of `object`.
   *
   * @private
   * @param {Object} [object] The object to query.
   * @param {string} key The key of the property to get.
   * @returns {*} Returns the property value.
   */
  function getValue(object, key) {
    return object == null ? undefined : object[key];
  }

  /**
   * Checks if `string` contains Unicode symbols.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {boolean} Returns `true` if a symbol is found, else `false`.
   */
  function hasUnicode(string) {
    return reHasUnicode.test(string);
  }

  /**
   * Checks if `string` contains a word composed of Unicode symbols.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {boolean} Returns `true` if a word is found, else `false`.
   */
  function hasUnicodeWord(string) {
    return reHasUnicodeWord.test(string);
  }

  /**
   * Converts `iterator` to an array.
   *
   * @private
   * @param {Object} iterator The iterator to convert.
   * @returns {Array} Returns the converted array.
   */
  function iteratorToArray(iterator) {
    var data,
        result = [];

    while (!(data = iterator.next()).done) {
      result.push(data.value);
    }
    return result;
  }

  /**
   * Converts `map` to its key-value pairs.
   *
   * @private
   * @param {Object} map The map to convert.
   * @returns {Array} Returns the key-value pairs.
   */
  function mapToArray(map) {
    var index = -1,
        result = Array(map.size);

    map.forEach(function(value, key) {
      result[++index] = [key, value];
    });
    return result;
  }

  /**
   * Creates a unary function that invokes `func` with its argument transformed.
   *
   * @private
   * @param {Function} func The function to wrap.
   * @param {Function} transform The argument transform.
   * @returns {Function} Returns the new function.
   */
  function overArg(func, transform) {
    return function(arg) {
      return func(transform(arg));
    };
  }

  /**
   * Replaces all `placeholder` elements in `array` with an internal placeholder
   * and returns an array of their indexes.
   *
   * @private
   * @param {Array} array The array to modify.
   * @param {*} placeholder The placeholder to replace.
   * @returns {Array} Returns the new array of placeholder indexes.
   */
  function replaceHolders(array, placeholder) {
    var index = -1,
        length = array.length,
        resIndex = 0,
        result = [];

    while (++index < length) {
      var value = array[index];
      if (value === placeholder || value === PLACEHOLDER) {
        array[index] = PLACEHOLDER;
        result[resIndex++] = index;
      }
    }
    return result;
  }

  /**
   * Converts `set` to an array of its values.
   *
   * @private
   * @param {Object} set The set to convert.
   * @returns {Array} Returns the values.
   */
  function setToArray(set) {
    var index = -1,
        result = Array(set.size);

    set.forEach(function(value) {
      result[++index] = value;
    });
    return result;
  }

  /**
   * Converts `set` to its value-value pairs.
   *
   * @private
   * @param {Object} set The set to convert.
   * @returns {Array} Returns the value-value pairs.
   */
  function setToPairs(set) {
    var index = -1,
        result = Array(set.size);

    set.forEach(function(value) {
      result[++index] = [value, value];
    });
    return result;
  }

  /**
   * A specialized version of `_.indexOf` which performs strict equality
   * comparisons of values, i.e. `===`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function strictIndexOf(array, value, fromIndex) {
    var index = fromIndex - 1,
        length = array.length;

    while (++index < length) {
      if (array[index] === value) {
        return index;
      }
    }
    return -1;
  }

  /**
   * A specialized version of `_.lastIndexOf` which performs strict equality
   * comparisons of values, i.e. `===`.
   *
   * @private
   * @param {Array} array The array to inspect.
   * @param {*} value The value to search for.
   * @param {number} fromIndex The index to search from.
   * @returns {number} Returns the index of the matched value, else `-1`.
   */
  function strictLastIndexOf(array, value, fromIndex) {
    var index = fromIndex + 1;
    while (index--) {
      if (array[index] === value) {
        return index;
      }
    }
    return index;
  }

  /**
   * Gets the number of symbols in `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the string size.
   */
  function stringSize(string) {
    return hasUnicode(string)
      ? unicodeSize(string)
      : asciiSize(string);
  }

  /**
   * Converts `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function stringToArray(string) {
    return hasUnicode(string)
      ? unicodeToArray(string)
      : asciiToArray(string);
  }

  /**
   * Used by `_.trim` and `_.trimEnd` to get the index of the last non-whitespace
   * character of `string`.
   *
   * @private
   * @param {string} string The string to inspect.
   * @returns {number} Returns the index of the last non-whitespace character.
   */
  function trimmedEndIndex(string) {
    var index = string.length;

    while (index-- && reWhitespace.test(string.charAt(index))) {}
    return index;
  }

  /**
   * Used by `_.unescape` to convert HTML entities to characters.
   *
   * @private
   * @param {string} chr The matched character to unescape.
   * @returns {string} Returns the unescaped character.
   */
  var unescapeHtmlChar = basePropertyOf(htmlUnescapes);

  /**
   * Gets the size of a Unicode `string`.
   *
   * @private
   * @param {string} string The string inspect.
   * @returns {number} Returns the string size.
   */
  function unicodeSize(string) {
    var result = reUnicode.lastIndex = 0;
    while (reUnicode.test(string)) {
      ++result;
    }
    return result;
  }

  /**
   * Converts a Unicode `string` to an array.
   *
   * @private
   * @param {string} string The string to convert.
   * @returns {Array} Returns the converted array.
   */
  function unicodeToArray(string) {
    return string.match(reUnicode) || [];
  }

  /**
   * Splits a Unicode `string` into an array of its words.
   *
   * @private
   * @param {string} The string to inspect.
   * @returns {Array} Returns the words of `string`.
   */
  function unicodeWords(string) {
    return string.match(reUnicodeWord) || [];
  }

  /*--------------------------------------------------------------------------*/

  /**
   * Create a new pristine `lodash` function using the `context` object.
   *
   * @static
   * @memberOf _
   * @since 1.1.0
   * @category Util
   * @param {Object} [context=root] The context object.
   * @returns {Function} Returns a new `lodash` function.
   * @example
   *
   * _.mixin({ 'foo': _.constant('foo') });
   *
   * var lodash = _.runInContext();
   * lodash.mixin({ 'bar': lodash.constant('bar') });
   *
   * _.isFunction(_.foo);
   * // => true
   * _.isFunction(_.bar);
   * // => false
   *
   * lodash.isFunction(lodash.foo);
   * // => false
   * lodash.isFunction(lodash.bar);
   * // => true
   *
   * // Create a suped-up `defer` in Node.js.
   * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
   */
  var runInContext = (function runInContext(context) {
    context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));

    /** Built-in constructor references. */
    var Array = context.Array,
        Date = context.Date,
        Error = context.Error,
        Function = context.Function,
        Math = context.Math,
        Object = context.Object,
        RegExp = context.RegExp,
        String = context.String,
        TypeError = context.TypeError;

    /** Used for built-in method references. */
    var arrayProto = Array.prototype,
        funcProto = Function.prototype,
        objectProto = Object.prototype;

    /** Used to detect overreaching core-js shims. */
    var coreJsData = context['__core-js_shared__'];

    /** Used to resolve the decompiled source of functions. */
    var funcToString = funcProto.toString;

    /** Used to check objects for own properties. */
    var hasOwnProperty = objectProto.hasOwnProperty;

    /** Used to generate unique IDs. */
    var idCounter = 0;

    /** Used to detect methods masquerading as native. */
    var maskSrcKey = (function() {
      var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
      return uid ? ('Symbol(src)_1.' + uid) : '';
    }());

    /**
     * Used to resolve the
     * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
     * of values.
     */
    var nativeObjectToString = objectProto.toString;

    /** Used to infer the `Object` constructor. */
    var objectCtorString = funcToString.call(Object);

    /** Used to restore the original `_` reference in `_.noConflict`. */
    var oldDash = root._;

    /** Used to detect if a method is native. */
    var reIsNative = RegExp('^' +
      funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
      .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
    );

    /** Built-in value references. */
    var Buffer = moduleExports ? context.Buffer : undefined,
        Symbol = context.Symbol,
        Uint8Array = context.Uint8Array,
        allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
        getPrototype = overArg(Object.getPrototypeOf, Object),
        objectCreate = Object.create,
        propertyIsEnumerable = objectProto.propertyIsEnumerable,
        splice = arrayProto.splice,
        spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
        symIterator = Symbol ? Symbol.iterator : undefined,
        symToStringTag = Symbol ? Symbol.toStringTag : undefined;

    var defineProperty = (function() {
      try {
        var func = getNative(Object, 'defineProperty');
        func({}, '', {});
        return func;
      } catch (e) {}
    }());

    /** Mocked built-ins. */
    var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
        ctxNow = Date && Date.now !== root.Date.now && Date.now,
        ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;

    /* Built-in method references for those with the same name as other `lodash` methods. */
    var nativeCeil = Math.ceil,
        nativeFloor = Math.floor,
        nativeGetSymbols = Object.getOwnPropertySymbols,
        nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
        nativeIsFinite = context.isFinite,
        nativeJoin = arrayProto.join,
        nativeKeys = overArg(Object.keys, Object),
        nativeMax = Math.max,
        nativeMin = Math.min,
        nativeNow = Date.now,
        nativeParseInt = context.parseInt,
        nativeRandom = Math.random,
        nativeReverse = arrayProto.reverse;

    /* Built-in method references that are verified to be native. */
    var DataView = getNative(context, 'DataView'),
        Map = getNative(context, 'Map'),
        Promise = getNative(context, 'Promise'),
        Set = getNative(context, 'Set'),
        WeakMap = getNative(context, 'WeakMap'),
        nativeCreate = getNative(Object, 'create');

    /** Used to store function metadata. */
    var metaMap = WeakMap && new WeakMap;

    /** Used to lookup unminified function names. */
    var realNames = {};

    /** Used to detect maps, sets, and weakmaps. */
    var dataViewCtorString = toSource(DataView),
        mapCtorString = toSource(Map),
        promiseCtorString = toSource(Promise),
        setCtorString = toSource(Set),
        weakMapCtorString = toSource(WeakMap);

    /** Used to convert symbols to primitives and strings. */
    var symbolProto = Symbol ? Symbol.prototype : undefined,
        symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
        symbolToString = symbolProto ? symbolProto.toString : undefined;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` object which wraps `value` to enable implicit method
     * chain sequences. Methods that operate on and return arrays, collections,
     * and functions can be chained together. Methods that retrieve a single value
     * or may return a primitive value will automatically end the chain sequence
     * and return the unwrapped value. Otherwise, the value must be unwrapped
     * with `_#value`.
     *
     * Explicit chain sequences, which must be unwrapped with `_#value`, may be
     * enabled using `_.chain`.
     *
     * The execution of chained methods is lazy, that is, it's deferred until
     * `_#value` is implicitly or explicitly called.
     *
     * Lazy evaluation allows several methods to support shortcut fusion.
     * Shortcut fusion is an optimization to merge iteratee calls; this avoids
     * the creation of intermediate arrays and can greatly reduce the number of
     * iteratee executions. Sections of a chain sequence qualify for shortcut
     * fusion if the section is applied to an array and iteratees accept only
     * one argument. The heuristic for whether a section qualifies for shortcut
     * fusion is subject to change.
     *
     * Chaining is supported in custom builds as long as the `_#value` method is
     * directly or indirectly included in the build.
     *
     * In addition to lodash methods, wrappers have `Array` and `String` methods.
     *
     * The wrapper `Array` methods are:
     * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
     *
     * The wrapper `String` methods are:
     * `replace` and `split`
     *
     * The wrapper methods that support shortcut fusion are:
     * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
     * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
     * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
     *
     * The chainable wrapper methods are:
     * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
     * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
     * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
     * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
     * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
     * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
     * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
     * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
     * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
     * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
     * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
     * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
     * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
     * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
     * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
     * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
     * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
     * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
     * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
     * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
     * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
     * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
     * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
     * `zipObject`, `zipObjectDeep`, and `zipWith`
     *
     * The wrapper methods that are **not** chainable by default are:
     * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
     * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
     * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
     * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
     * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
     * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
     * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
     * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
     * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
     * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
     * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
     * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
     * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
     * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
     * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
     * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
     * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
     * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
     * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
     * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
     * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
     * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
     * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
     * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
     * `upperFirst`, `value`, and `words`
     *
     * @name _
     * @constructor
     * @category Seq
     * @param {*} value The value to wrap in a `lodash` instance.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var wrapped = _([1, 2, 3]);
     *
     * // Returns an unwrapped value.
     * wrapped.reduce(_.add);
     * // => 6
     *
     * // Returns a wrapped value.
     * var squares = wrapped.map(square);
     *
     * _.isArray(squares);
     * // => false
     *
     * _.isArray(squares.value());
     * // => true
     */
    function lodash(value) {
      if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
        if (value instanceof LodashWrapper) {
          return value;
        }
        if (hasOwnProperty.call(value, '__wrapped__')) {
          return wrapperClone(value);
        }
      }
      return new LodashWrapper(value);
    }

    /**
     * The base implementation of `_.create` without support for assigning
     * properties to the created object.
     *
     * @private
     * @param {Object} proto The object to inherit from.
     * @returns {Object} Returns the new object.
     */
    var baseCreate = (function() {
      function object() {}
      return function(proto) {
        if (!isObject(proto)) {
          return {};
        }
        if (objectCreate) {
          return objectCreate(proto);
        }
        object.prototype = proto;
        var result = new object;
        object.prototype = undefined;
        return result;
      };
    }());

    /**
     * The function whose prototype chain sequence wrappers inherit from.
     *
     * @private
     */
    function baseLodash() {
      // No operation performed.
    }

    /**
     * The base constructor for creating `lodash` wrapper objects.
     *
     * @private
     * @param {*} value The value to wrap.
     * @param {boolean} [chainAll] Enable explicit method chain sequences.
     */
    function LodashWrapper(value, chainAll) {
      this.__wrapped__ = value;
      this.__actions__ = [];
      this.__chain__ = !!chainAll;
      this.__index__ = 0;
      this.__values__ = undefined;
    }

    /**
     * By default, the template delimiters used by lodash are like those in
     * embedded Ruby (ERB) as well as ES2015 template strings. Change the
     * following template settings to use alternative delimiters.
     *
     * @static
     * @memberOf _
     * @type {Object}
     */
    lodash.templateSettings = {

      /**
       * Used to detect `data` property values to be HTML-escaped.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      'escape': reEscape,

      /**
       * Used to detect code to be evaluated.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      'evaluate': reEvaluate,

      /**
       * Used to detect `data` property values to inject.
       *
       * @memberOf _.templateSettings
       * @type {RegExp}
       */
      'interpolate': reInterpolate,

      /**
       * Used to reference the data object in the template text.
       *
       * @memberOf _.templateSettings
       * @type {string}
       */
      'variable': '',

      /**
       * Used to import variables into the compiled template.
       *
       * @memberOf _.templateSettings
       * @type {Object}
       */
      'imports': {

        /**
         * A reference to the `lodash` function.
         *
         * @memberOf _.templateSettings.imports
         * @type {Function}
         */
        '_': lodash
      }
    };

    // Ensure wrappers are instances of `baseLodash`.
    lodash.prototype = baseLodash.prototype;
    lodash.prototype.constructor = lodash;

    LodashWrapper.prototype = baseCreate(baseLodash.prototype);
    LodashWrapper.prototype.constructor = LodashWrapper;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
     *
     * @private
     * @constructor
     * @param {*} value The value to wrap.
     */
    function LazyWrapper(value) {
      this.__wrapped__ = value;
      this.__actions__ = [];
      this.__dir__ = 1;
      this.__filtered__ = false;
      this.__iteratees__ = [];
      this.__takeCount__ = MAX_ARRAY_LENGTH;
      this.__views__ = [];
    }

    /**
     * Creates a clone of the lazy wrapper object.
     *
     * @private
     * @name clone
     * @memberOf LazyWrapper
     * @returns {Object} Returns the cloned `LazyWrapper` object.
     */
    function lazyClone() {
      var result = new LazyWrapper(this.__wrapped__);
      result.__actions__ = copyArray(this.__actions__);
      result.__dir__ = this.__dir__;
      result.__filtered__ = this.__filtered__;
      result.__iteratees__ = copyArray(this.__iteratees__);
      result.__takeCount__ = this.__takeCount__;
      result.__views__ = copyArray(this.__views__);
      return result;
    }

    /**
     * Reverses the direction of lazy iteration.
     *
     * @private
     * @name reverse
     * @memberOf LazyWrapper
     * @returns {Object} Returns the new reversed `LazyWrapper` object.
     */
    function lazyReverse() {
      if (this.__filtered__) {
        var result = new LazyWrapper(this);
        result.__dir__ = -1;
        result.__filtered__ = true;
      } else {
        result = this.clone();
        result.__dir__ *= -1;
      }
      return result;
    }

    /**
     * Extracts the unwrapped value from its lazy wrapper.
     *
     * @private
     * @name value
     * @memberOf LazyWrapper
     * @returns {*} Returns the unwrapped value.
     */
    function lazyValue() {
      var array = this.__wrapped__.value(),
          dir = this.__dir__,
          isArr = isArray(array),
          isRight = dir < 0,
          arrLength = isArr ? array.length : 0,
          view = getView(0, arrLength, this.__views__),
          start = view.start,
          end = view.end,
          length = end - start,
          index = isRight ? end : (start - 1),
          iteratees = this.__iteratees__,
          iterLength = iteratees.length,
          resIndex = 0,
          takeCount = nativeMin(length, this.__takeCount__);

      if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
        return baseWrapperValue(array, this.__actions__);
      }
      var result = [];

      outer:
      while (length-- && resIndex < takeCount) {
        index += dir;

        var iterIndex = -1,
            value = array[index];

        while (++iterIndex < iterLength) {
          var data = iteratees[iterIndex],
              iteratee = data.iteratee,
              type = data.type,
              computed = iteratee(value);

          if (type == LAZY_MAP_FLAG) {
            value = computed;
          } else if (!computed) {
            if (type == LAZY_FILTER_FLAG) {
              continue outer;
            } else {
              break outer;
            }
          }
        }
        result[resIndex++] = value;
      }
      return result;
    }

    // Ensure `LazyWrapper` is an instance of `baseLodash`.
    LazyWrapper.prototype = baseCreate(baseLodash.prototype);
    LazyWrapper.prototype.constructor = LazyWrapper;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a hash object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function Hash(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the hash.
     *
     * @private
     * @name clear
     * @memberOf Hash
     */
    function hashClear() {
      this.__data__ = nativeCreate ? nativeCreate(null) : {};
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the hash.
     *
     * @private
     * @name delete
     * @memberOf Hash
     * @param {Object} hash The hash to modify.
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function hashDelete(key) {
      var result = this.has(key) && delete this.__data__[key];
      this.size -= result ? 1 : 0;
      return result;
    }

    /**
     * Gets the hash value for `key`.
     *
     * @private
     * @name get
     * @memberOf Hash
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function hashGet(key) {
      var data = this.__data__;
      if (nativeCreate) {
        var result = data[key];
        return result === HASH_UNDEFINED ? undefined : result;
      }
      return hasOwnProperty.call(data, key) ? data[key] : undefined;
    }

    /**
     * Checks if a hash value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf Hash
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function hashHas(key) {
      var data = this.__data__;
      return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
    }

    /**
     * Sets the hash `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf Hash
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the hash instance.
     */
    function hashSet(key, value) {
      var data = this.__data__;
      this.size += this.has(key) ? 0 : 1;
      data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
      return this;
    }

    // Add methods to `Hash`.
    Hash.prototype.clear = hashClear;
    Hash.prototype['delete'] = hashDelete;
    Hash.prototype.get = hashGet;
    Hash.prototype.has = hashHas;
    Hash.prototype.set = hashSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates an list cache object.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function ListCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the list cache.
     *
     * @private
     * @name clear
     * @memberOf ListCache
     */
    function listCacheClear() {
      this.__data__ = [];
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the list cache.
     *
     * @private
     * @name delete
     * @memberOf ListCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function listCacheDelete(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index < 0) {
        return false;
      }
      var lastIndex = data.length - 1;
      if (index == lastIndex) {
        data.pop();
      } else {
        splice.call(data, index, 1);
      }
      --this.size;
      return true;
    }

    /**
     * Gets the list cache value for `key`.
     *
     * @private
     * @name get
     * @memberOf ListCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function listCacheGet(key) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      return index < 0 ? undefined : data[index][1];
    }

    /**
     * Checks if a list cache value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf ListCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function listCacheHas(key) {
      return assocIndexOf(this.__data__, key) > -1;
    }

    /**
     * Sets the list cache `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf ListCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the list cache instance.
     */
    function listCacheSet(key, value) {
      var data = this.__data__,
          index = assocIndexOf(data, key);

      if (index < 0) {
        ++this.size;
        data.push([key, value]);
      } else {
        data[index][1] = value;
      }
      return this;
    }

    // Add methods to `ListCache`.
    ListCache.prototype.clear = listCacheClear;
    ListCache.prototype['delete'] = listCacheDelete;
    ListCache.prototype.get = listCacheGet;
    ListCache.prototype.has = listCacheHas;
    ListCache.prototype.set = listCacheSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a map cache object to store key-value pairs.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function MapCache(entries) {
      var index = -1,
          length = entries == null ? 0 : entries.length;

      this.clear();
      while (++index < length) {
        var entry = entries[index];
        this.set(entry[0], entry[1]);
      }
    }

    /**
     * Removes all key-value entries from the map.
     *
     * @private
     * @name clear
     * @memberOf MapCache
     */
    function mapCacheClear() {
      this.size = 0;
      this.__data__ = {
        'hash': new Hash,
        'map': new (Map || ListCache),
        'string': new Hash
      };
    }

    /**
     * Removes `key` and its value from the map.
     *
     * @private
     * @name delete
     * @memberOf MapCache
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function mapCacheDelete(key) {
      var result = getMapData(this, key)['delete'](key);
      this.size -= result ? 1 : 0;
      return result;
    }

    /**
     * Gets the map value for `key`.
     *
     * @private
     * @name get
     * @memberOf MapCache
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function mapCacheGet(key) {
      return getMapData(this, key).get(key);
    }

    /**
     * Checks if a map value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf MapCache
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function mapCacheHas(key) {
      return getMapData(this, key).has(key);
    }

    /**
     * Sets the map `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf MapCache
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the map cache instance.
     */
    function mapCacheSet(key, value) {
      var data = getMapData(this, key),
          size = data.size;

      data.set(key, value);
      this.size += data.size == size ? 0 : 1;
      return this;
    }

    // Add methods to `MapCache`.
    MapCache.prototype.clear = mapCacheClear;
    MapCache.prototype['delete'] = mapCacheDelete;
    MapCache.prototype.get = mapCacheGet;
    MapCache.prototype.has = mapCacheHas;
    MapCache.prototype.set = mapCacheSet;

    /*------------------------------------------------------------------------*/

    /**
     *
     * Creates an array cache object to store unique values.
     *
     * @private
     * @constructor
     * @param {Array} [values] The values to cache.
     */
    function SetCache(values) {
      var index = -1,
          length = values == null ? 0 : values.length;

      this.__data__ = new MapCache;
      while (++index < length) {
        this.add(values[index]);
      }
    }

    /**
     * Adds `value` to the array cache.
     *
     * @private
     * @name add
     * @memberOf SetCache
     * @alias push
     * @param {*} value The value to cache.
     * @returns {Object} Returns the cache instance.
     */
    function setCacheAdd(value) {
      this.__data__.set(value, HASH_UNDEFINED);
      return this;
    }

    /**
     * Checks if `value` is in the array cache.
     *
     * @private
     * @name has
     * @memberOf SetCache
     * @param {*} value The value to search for.
     * @returns {number} Returns `true` if `value` is found, else `false`.
     */
    function setCacheHas(value) {
      return this.__data__.has(value);
    }

    // Add methods to `SetCache`.
    SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
    SetCache.prototype.has = setCacheHas;

    /*------------------------------------------------------------------------*/

    /**
     * Creates a stack cache object to store key-value pairs.
     *
     * @private
     * @constructor
     * @param {Array} [entries] The key-value pairs to cache.
     */
    function Stack(entries) {
      var data = this.__data__ = new ListCache(entries);
      this.size = data.size;
    }

    /**
     * Removes all key-value entries from the stack.
     *
     * @private
     * @name clear
     * @memberOf Stack
     */
    function stackClear() {
      this.__data__ = new ListCache;
      this.size = 0;
    }

    /**
     * Removes `key` and its value from the stack.
     *
     * @private
     * @name delete
     * @memberOf Stack
     * @param {string} key The key of the value to remove.
     * @returns {boolean} Returns `true` if the entry was removed, else `false`.
     */
    function stackDelete(key) {
      var data = this.__data__,
          result = data['delete'](key);

      this.size = data.size;
      return result;
    }

    /**
     * Gets the stack value for `key`.
     *
     * @private
     * @name get
     * @memberOf Stack
     * @param {string} key The key of the value to get.
     * @returns {*} Returns the entry value.
     */
    function stackGet(key) {
      return this.__data__.get(key);
    }

    /**
     * Checks if a stack value for `key` exists.
     *
     * @private
     * @name has
     * @memberOf Stack
     * @param {string} key The key of the entry to check.
     * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
     */
    function stackHas(key) {
      return this.__data__.has(key);
    }

    /**
     * Sets the stack `key` to `value`.
     *
     * @private
     * @name set
     * @memberOf Stack
     * @param {string} key The key of the value to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns the stack cache instance.
     */
    function stackSet(key, value) {
      var data = this.__data__;
      if (data instanceof ListCache) {
        var pairs = data.__data__;
        if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
          pairs.push([key, value]);
          this.size = ++data.size;
          return this;
        }
        data = this.__data__ = new MapCache(pairs);
      }
      data.set(key, value);
      this.size = data.size;
      return this;
    }

    // Add methods to `Stack`.
    Stack.prototype.clear = stackClear;
    Stack.prototype['delete'] = stackDelete;
    Stack.prototype.get = stackGet;
    Stack.prototype.has = stackHas;
    Stack.prototype.set = stackSet;

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of the enumerable property names of the array-like `value`.
     *
     * @private
     * @param {*} value The value to query.
     * @param {boolean} inherited Specify returning inherited property names.
     * @returns {Array} Returns the array of property names.
     */
    function arrayLikeKeys(value, inherited) {
      var isArr = isArray(value),
          isArg = !isArr && isArguments(value),
          isBuff = !isArr && !isArg && isBuffer(value),
          isType = !isArr && !isArg && !isBuff && isTypedArray(value),
          skipIndexes = isArr || isArg || isBuff || isType,
          result = skipIndexes ? baseTimes(value.length, String) : [],
          length = result.length;

      for (var key in value) {
        if ((inherited || hasOwnProperty.call(value, key)) &&
            !(skipIndexes && (
               // Safari 9 has enumerable `arguments.length` in strict mode.
               key == 'length' ||
               // Node.js 0.10 has enumerable non-index properties on buffers.
               (isBuff && (key == 'offset' || key == 'parent')) ||
               // PhantomJS 2 has enumerable non-index properties on typed arrays.
               (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
               // Skip index properties.
               isIndex(key, length)
            ))) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * A specialized version of `_.sample` for arrays.
     *
     * @private
     * @param {Array} array The array to sample.
     * @returns {*} Returns the random element.
     */
    function arraySample(array) {
      var length = array.length;
      return length ? array[baseRandom(0, length - 1)] : undefined;
    }

    /**
     * A specialized version of `_.sampleSize` for arrays.
     *
     * @private
     * @param {Array} array The array to sample.
     * @param {number} n The number of elements to sample.
     * @returns {Array} Returns the random elements.
     */
    function arraySampleSize(array, n) {
      return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
    }

    /**
     * A specialized version of `_.shuffle` for arrays.
     *
     * @private
     * @param {Array} array The array to shuffle.
     * @returns {Array} Returns the new shuffled array.
     */
    function arrayShuffle(array) {
      return shuffleSelf(copyArray(array));
    }

    /**
     * This function is like `assignValue` except that it doesn't assign
     * `undefined` values.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function assignMergeValue(object, key, value) {
      if ((value !== undefined && !eq(object[key], value)) ||
          (value === undefined && !(key in object))) {
        baseAssignValue(object, key, value);
      }
    }

    /**
     * Assigns `value` to `key` of `object` if the existing value is not equivalent
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function assignValue(object, key, value) {
      var objValue = object[key];
      if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
          (value === undefined && !(key in object))) {
        baseAssignValue(object, key, value);
      }
    }

    /**
     * Gets the index at which the `key` is found in `array` of key-value pairs.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {*} key The key to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     */
    function assocIndexOf(array, key) {
      var length = array.length;
      while (length--) {
        if (eq(array[length][0], key)) {
          return length;
        }
      }
      return -1;
    }

    /**
     * Aggregates elements of `collection` on `accumulator` with keys transformed
     * by `iteratee` and values set by `setter`.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform keys.
     * @param {Object} accumulator The initial aggregated object.
     * @returns {Function} Returns `accumulator`.
     */
    function baseAggregator(collection, setter, iteratee, accumulator) {
      baseEach(collection, function(value, key, collection) {
        setter(accumulator, value, iteratee(value), collection);
      });
      return accumulator;
    }

    /**
     * The base implementation of `_.assign` without support for multiple sources
     * or `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @returns {Object} Returns `object`.
     */
    function baseAssign(object, source) {
      return object && copyObject(source, keys(source), object);
    }

    /**
     * The base implementation of `_.assignIn` without support for multiple sources
     * or `customizer` functions.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @returns {Object} Returns `object`.
     */
    function baseAssignIn(object, source) {
      return object && copyObject(source, keysIn(source), object);
    }

    /**
     * The base implementation of `assignValue` and `assignMergeValue` without
     * value checks.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {string} key The key of the property to assign.
     * @param {*} value The value to assign.
     */
    function baseAssignValue(object, key, value) {
      if (key == '__proto__' && defineProperty) {
        defineProperty(object, key, {
          'configurable': true,
          'enumerable': true,
          'value': value,
          'writable': true
        });
      } else {
        object[key] = value;
      }
    }

    /**
     * The base implementation of `_.at` without support for individual paths.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {string[]} paths The property paths to pick.
     * @returns {Array} Returns the picked elements.
     */
    function baseAt(object, paths) {
      var index = -1,
          length = paths.length,
          result = Array(length),
          skip = object == null;

      while (++index < length) {
        result[index] = skip ? undefined : get(object, paths[index]);
      }
      return result;
    }

    /**
     * The base implementation of `_.clamp` which doesn't coerce arguments.
     *
     * @private
     * @param {number} number The number to clamp.
     * @param {number} [lower] The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the clamped number.
     */
    function baseClamp(number, lower, upper) {
      if (number === number) {
        if (upper !== undefined) {
          number = number <= upper ? number : upper;
        }
        if (lower !== undefined) {
          number = number >= lower ? number : lower;
        }
      }
      return number;
    }

    /**
     * The base implementation of `_.clone` and `_.cloneDeep` which tracks
     * traversed objects.
     *
     * @private
     * @param {*} value The value to clone.
     * @param {boolean} bitmask The bitmask flags.
     *  1 - Deep clone
     *  2 - Flatten inherited properties
     *  4 - Clone symbols
     * @param {Function} [customizer] The function to customize cloning.
     * @param {string} [key] The key of `value`.
     * @param {Object} [object] The parent object of `value`.
     * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
     * @returns {*} Returns the cloned value.
     */
    function baseClone(value, bitmask, customizer, key, object, stack) {
      var result,
          isDeep = bitmask & CLONE_DEEP_FLAG,
          isFlat = bitmask & CLONE_FLAT_FLAG,
          isFull = bitmask & CLONE_SYMBOLS_FLAG;

      if (customizer) {
        result = object ? customizer(value, key, object, stack) : customizer(value);
      }
      if (result !== undefined) {
        return result;
      }
      if (!isObject(value)) {
        return value;
      }
      var isArr = isArray(value);
      if (isArr) {
        result = initCloneArray(value);
        if (!isDeep) {
          return copyArray(value, result);
        }
      } else {
        var tag = getTag(value),
            isFunc = tag == funcTag || tag == genTag;

        if (isBuffer(value)) {
          return cloneBuffer(value, isDeep);
        }
        if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
          result = (isFlat || isFunc) ? {} : initCloneObject(value);
          if (!isDeep) {
            return isFlat
              ? copySymbolsIn(value, baseAssignIn(result, value))
              : copySymbols(value, baseAssign(result, value));
          }
        } else {
          if (!cloneableTags[tag]) {
            return object ? value : {};
          }
          result = initCloneByTag(value, tag, isDeep);
        }
      }
      // Check for circular references and return its corresponding clone.
      stack || (stack = new Stack);
      var stacked = stack.get(value);
      if (stacked) {
        return stacked;
      }
      stack.set(value, result);

      if (isSet(value)) {
        value.forEach(function(subValue) {
          result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
        });
      } else if (isMap(value)) {
        value.forEach(function(subValue, key) {
          result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
        });
      }

      var keysFunc = isFull
        ? (isFlat ? getAllKeysIn : getAllKeys)
        : (isFlat ? keysIn : keys);

      var props = isArr ? undefined : keysFunc(value);
      arrayEach(props || value, function(subValue, key) {
        if (props) {
          key = subValue;
          subValue = value[key];
        }
        // Recursively populate clone (susceptible to call stack limits).
        assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
      });
      return result;
    }

    /**
     * The base implementation of `_.conforms` which doesn't clone `source`.
     *
     * @private
     * @param {Object} source The object of property predicates to conform to.
     * @returns {Function} Returns the new spec function.
     */
    function baseConforms(source) {
      var props = keys(source);
      return function(object) {
        return baseConformsTo(object, source, props);
      };
    }

    /**
     * The base implementation of `_.conformsTo` which accepts `props` to check.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property predicates to conform to.
     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
     */
    function baseConformsTo(object, source, props) {
      var length = props.length;
      if (object == null) {
        return !length;
      }
      object = Object(object);
      while (length--) {
        var key = props[length],
            predicate = source[key],
            value = object[key];

        if ((value === undefined && !(key in object)) || !predicate(value)) {
          return false;
        }
      }
      return true;
    }

    /**
     * The base implementation of `_.delay` and `_.defer` which accepts `args`
     * to provide to `func`.
     *
     * @private
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {Array} args The arguments to provide to `func`.
     * @returns {number|Object} Returns the timer id or timeout object.
     */
    function baseDelay(func, wait, args) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return setTimeout(function() { func.apply(undefined, args); }, wait);
    }

    /**
     * The base implementation of methods like `_.difference` without support
     * for excluding multiple arrays or iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Array} values The values to exclude.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     */
    function baseDifference(array, values, iteratee, comparator) {
      var index = -1,
          includes = arrayIncludes,
          isCommon = true,
          length = array.length,
          result = [],
          valuesLength = values.length;

      if (!length) {
        return result;
      }
      if (iteratee) {
        values = arrayMap(values, baseUnary(iteratee));
      }
      if (comparator) {
        includes = arrayIncludesWith;
        isCommon = false;
      }
      else if (values.length >= LARGE_ARRAY_SIZE) {
        includes = cacheHas;
        isCommon = false;
        values = new SetCache(values);
      }
      outer:
      while (++index < length) {
        var value = array[index],
            computed = iteratee == null ? value : iteratee(value);

        value = (comparator || value !== 0) ? value : 0;
        if (isCommon && computed === computed) {
          var valuesIndex = valuesLength;
          while (valuesIndex--) {
            if (values[valuesIndex] === computed) {
              continue outer;
            }
          }
          result.push(value);
        }
        else if (!includes(values, computed, comparator)) {
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.forEach` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     */
    var baseEach = createBaseEach(baseForOwn);

    /**
     * The base implementation of `_.forEachRight` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     */
    var baseEachRight = createBaseEach(baseForOwnRight, true);

    /**
     * The base implementation of `_.every` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`
     */
    function baseEvery(collection, predicate) {
      var result = true;
      baseEach(collection, function(value, index, collection) {
        result = !!predicate(value, index, collection);
        return result;
      });
      return result;
    }

    /**
     * The base implementation of methods like `_.max` and `_.min` which accepts a
     * `comparator` to determine the extremum value.
     *
     * @private
     * @param {Array} array The array to iterate over.
     * @param {Function} iteratee The iteratee invoked per iteration.
     * @param {Function} comparator The comparator used to compare values.
     * @returns {*} Returns the extremum value.
     */
    function baseExtremum(array, iteratee, comparator) {
      var index = -1,
          length = array.length;

      while (++index < length) {
        var value = array[index],
            current = iteratee(value);

        if (current != null && (computed === undefined
              ? (current === current && !isSymbol(current))
              : comparator(current, computed)
            )) {
          var computed = current,
              result = value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.fill` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     */
    function baseFill(array, value, start, end) {
      var length = array.length;

      start = toInteger(start);
      if (start < 0) {
        start = -start > length ? 0 : (length + start);
      }
      end = (end === undefined || end > length) ? length : toInteger(end);
      if (end < 0) {
        end += length;
      }
      end = start > end ? 0 : toLength(end);
      while (start < end) {
        array[start++] = value;
      }
      return array;
    }

    /**
     * The base implementation of `_.filter` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     */
    function baseFilter(collection, predicate) {
      var result = [];
      baseEach(collection, function(value, index, collection) {
        if (predicate(value, index, collection)) {
          result.push(value);
        }
      });
      return result;
    }

    /**
     * The base implementation of `_.flatten` with support for restricting flattening.
     *
     * @private
     * @param {Array} array The array to flatten.
     * @param {number} depth The maximum recursion depth.
     * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
     * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
     * @param {Array} [result=[]] The initial result value.
     * @returns {Array} Returns the new flattened array.
     */
    function baseFlatten(array, depth, predicate, isStrict, result) {
      var index = -1,
          length = array.length;

      predicate || (predicate = isFlattenable);
      result || (result = []);

      while (++index < length) {
        var value = array[index];
        if (depth > 0 && predicate(value)) {
          if (depth > 1) {
            // Recursively flatten arrays (susceptible to call stack limits).
            baseFlatten(value, depth - 1, predicate, isStrict, result);
          } else {
            arrayPush(result, value);
          }
        } else if (!isStrict) {
          result[result.length] = value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `baseForOwn` which iterates over `object`
     * properties returned by `keysFunc` and invokes `iteratee` for each property.
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseFor = createBaseFor();

    /**
     * This function is like `baseFor` except that it iterates over properties
     * in the opposite order.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @returns {Object} Returns `object`.
     */
    var baseForRight = createBaseFor(true);

    /**
     * The base implementation of `_.forOwn` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwn(object, iteratee) {
      return object && baseFor(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Object} Returns `object`.
     */
    function baseForOwnRight(object, iteratee) {
      return object && baseForRight(object, iteratee, keys);
    }

    /**
     * The base implementation of `_.functions` which creates an array of
     * `object` function property names filtered from `props`.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Array} props The property names to filter.
     * @returns {Array} Returns the function names.
     */
    function baseFunctions(object, props) {
      return arrayFilter(props, function(key) {
        return isFunction(object[key]);
      });
    }

    /**
     * The base implementation of `_.get` without support for default values.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to get.
     * @returns {*} Returns the resolved value.
     */
    function baseGet(object, path) {
      path = castPath(path, object);

      var index = 0,
          length = path.length;

      while (object != null && index < length) {
        object = object[toKey(path[index++])];
      }
      return (index && index == length) ? object : undefined;
    }

    /**
     * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
     * `keysFunc` and `symbolsFunc` to get the enumerable property names and
     * symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Function} keysFunc The function to get the keys of `object`.
     * @param {Function} symbolsFunc The function to get the symbols of `object`.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function baseGetAllKeys(object, keysFunc, symbolsFunc) {
      var result = keysFunc(object);
      return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
    }

    /**
     * The base implementation of `getTag` without fallbacks for buggy environments.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the `toStringTag`.
     */
    function baseGetTag(value) {
      if (value == null) {
        return value === undefined ? undefinedTag : nullTag;
      }
      return (symToStringTag && symToStringTag in Object(value))
        ? getRawTag(value)
        : objectToString(value);
    }

    /**
     * The base implementation of `_.gt` which doesn't coerce arguments.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than `other`,
     *  else `false`.
     */
    function baseGt(value, other) {
      return value > other;
    }

    /**
     * The base implementation of `_.has` without support for deep paths.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {Array|string} key The key to check.
     * @returns {boolean} Returns `true` if `key` exists, else `false`.
     */
    function baseHas(object, key) {
      return object != null && hasOwnProperty.call(object, key);
    }

    /**
     * The base implementation of `_.hasIn` without support for deep paths.
     *
     * @private
     * @param {Object} [object] The object to query.
     * @param {Array|string} key The key to check.
     * @returns {boolean} Returns `true` if `key` exists, else `false`.
     */
    function baseHasIn(object, key) {
      return object != null && key in Object(object);
    }

    /**
     * The base implementation of `_.inRange` which doesn't coerce arguments.
     *
     * @private
     * @param {number} number The number to check.
     * @param {number} start The start of the range.
     * @param {number} end The end of the range.
     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
     */
    function baseInRange(number, start, end) {
      return number >= nativeMin(start, end) && number < nativeMax(start, end);
    }

    /**
     * The base implementation of methods like `_.intersection`, without support
     * for iteratee shorthands, that accepts an array of arrays to inspect.
     *
     * @private
     * @param {Array} arrays The arrays to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of shared values.
     */
    function baseIntersection(arrays, iteratee, comparator) {
      var includes = comparator ? arrayIncludesWith : arrayIncludes,
          length = arrays[0].length,
          othLength = arrays.length,
          othIndex = othLength,
          caches = Array(othLength),
          maxLength = Infinity,
          result = [];

      while (othIndex--) {
        var array = arrays[othIndex];
        if (othIndex && iteratee) {
          array = arrayMap(array, baseUnary(iteratee));
        }
        maxLength = nativeMin(array.length, maxLength);
        caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
          ? new SetCache(othIndex && array)
          : undefined;
      }
      array = arrays[0];

      var index = -1,
          seen = caches[0];

      outer:
      while (++index < length && result.length < maxLength) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        value = (comparator || value !== 0) ? value : 0;
        if (!(seen
              ? cacheHas(seen, computed)
              : includes(result, computed, comparator)
            )) {
          othIndex = othLength;
          while (--othIndex) {
            var cache = caches[othIndex];
            if (!(cache
                  ? cacheHas(cache, computed)
                  : includes(arrays[othIndex], computed, comparator))
                ) {
              continue outer;
            }
          }
          if (seen) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.invert` and `_.invertBy` which inverts
     * `object` with values transformed by `iteratee` and set by `setter`.
     *
     * @private
     * @param {Object} object The object to iterate over.
     * @param {Function} setter The function to set `accumulator` values.
     * @param {Function} iteratee The iteratee to transform values.
     * @param {Object} accumulator The initial inverted object.
     * @returns {Function} Returns `accumulator`.
     */
    function baseInverter(object, setter, iteratee, accumulator) {
      baseForOwn(object, function(value, key, object) {
        setter(accumulator, iteratee(value), key, object);
      });
      return accumulator;
    }

    /**
     * The base implementation of `_.invoke` without support for individual
     * method arguments.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the method to invoke.
     * @param {Array} args The arguments to invoke the method with.
     * @returns {*} Returns the result of the invoked method.
     */
    function baseInvoke(object, path, args) {
      path = castPath(path, object);
      object = parent(object, path);
      var func = object == null ? object : object[toKey(last(path))];
      return func == null ? undefined : apply(func, object, args);
    }

    /**
     * The base implementation of `_.isArguments`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
     */
    function baseIsArguments(value) {
      return isObjectLike(value) && baseGetTag(value) == argsTag;
    }

    /**
     * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
     */
    function baseIsArrayBuffer(value) {
      return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
    }

    /**
     * The base implementation of `_.isDate` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
     */
    function baseIsDate(value) {
      return isObjectLike(value) && baseGetTag(value) == dateTag;
    }

    /**
     * The base implementation of `_.isEqual` which supports partial comparisons
     * and tracks traversed objects.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {boolean} bitmask The bitmask flags.
     *  1 - Unordered comparison
     *  2 - Partial comparison
     * @param {Function} [customizer] The function to customize comparisons.
     * @param {Object} [stack] Tracks traversed `value` and `other` objects.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     */
    function baseIsEqual(value, other, bitmask, customizer, stack) {
      if (value === other) {
        return true;
      }
      if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
        return value !== value && other !== other;
      }
      return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
    }

    /**
     * A specialized version of `baseIsEqual` for arrays and objects which performs
     * deep comparisons and tracks traversed objects enabling objects with circular
     * references to be compared.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} [stack] Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
      var objIsArr = isArray(object),
          othIsArr = isArray(other),
          objTag = objIsArr ? arrayTag : getTag(object),
          othTag = othIsArr ? arrayTag : getTag(other);

      objTag = objTag == argsTag ? objectTag : objTag;
      othTag = othTag == argsTag ? objectTag : othTag;

      var objIsObj = objTag == objectTag,
          othIsObj = othTag == objectTag,
          isSameTag = objTag == othTag;

      if (isSameTag && isBuffer(object)) {
        if (!isBuffer(other)) {
          return false;
        }
        objIsArr = true;
        objIsObj = false;
      }
      if (isSameTag && !objIsObj) {
        stack || (stack = new Stack);
        return (objIsArr || isTypedArray(object))
          ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
          : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
      }
      if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
        var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
            othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');

        if (objIsWrapped || othIsWrapped) {
          var objUnwrapped = objIsWrapped ? object.value() : object,
              othUnwrapped = othIsWrapped ? other.value() : other;

          stack || (stack = new Stack);
          return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
        }
      }
      if (!isSameTag) {
        return false;
      }
      stack || (stack = new Stack);
      return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
    }

    /**
     * The base implementation of `_.isMap` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
     */
    function baseIsMap(value) {
      return isObjectLike(value) && getTag(value) == mapTag;
    }

    /**
     * The base implementation of `_.isMatch` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @param {Array} matchData The property names, values, and compare flags to match.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     */
    function baseIsMatch(object, source, matchData, customizer) {
      var index = matchData.length,
          length = index,
          noCustomizer = !customizer;

      if (object == null) {
        return !length;
      }
      object = Object(object);
      while (index--) {
        var data = matchData[index];
        if ((noCustomizer && data[2])
              ? data[1] !== object[data[0]]
              : !(data[0] in object)
            ) {
          return false;
        }
      }
      while (++index < length) {
        data = matchData[index];
        var key = data[0],
            objValue = object[key],
            srcValue = data[1];

        if (noCustomizer && data[2]) {
          if (objValue === undefined && !(key in object)) {
            return false;
          }
        } else {
          var stack = new Stack;
          if (customizer) {
            var result = customizer(objValue, srcValue, key, object, source, stack);
          }
          if (!(result === undefined
                ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
                : result
              )) {
            return false;
          }
        }
      }
      return true;
    }

    /**
     * The base implementation of `_.isNative` without bad shim checks.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function,
     *  else `false`.
     */
    function baseIsNative(value) {
      if (!isObject(value) || isMasked(value)) {
        return false;
      }
      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
      return pattern.test(toSource(value));
    }

    /**
     * The base implementation of `_.isRegExp` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
     */
    function baseIsRegExp(value) {
      return isObjectLike(value) && baseGetTag(value) == regexpTag;
    }

    /**
     * The base implementation of `_.isSet` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
     */
    function baseIsSet(value) {
      return isObjectLike(value) && getTag(value) == setTag;
    }

    /**
     * The base implementation of `_.isTypedArray` without Node.js optimizations.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
     */
    function baseIsTypedArray(value) {
      return isObjectLike(value) &&
        isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
    }

    /**
     * The base implementation of `_.iteratee`.
     *
     * @private
     * @param {*} [value=_.identity] The value to convert to an iteratee.
     * @returns {Function} Returns the iteratee.
     */
    function baseIteratee(value) {
      // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
      // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
      if (typeof value == 'function') {
        return value;
      }
      if (value == null) {
        return identity;
      }
      if (typeof value == 'object') {
        return isArray(value)
          ? baseMatchesProperty(value[0], value[1])
          : baseMatches(value);
      }
      return property(value);
    }

    /**
     * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function baseKeys(object) {
      if (!isPrototype(object)) {
        return nativeKeys(object);
      }
      var result = [];
      for (var key in Object(object)) {
        if (hasOwnProperty.call(object, key) && key != 'constructor') {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function baseKeysIn(object) {
      if (!isObject(object)) {
        return nativeKeysIn(object);
      }
      var isProto = isPrototype(object),
          result = [];

      for (var key in object) {
        if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.lt` which doesn't coerce arguments.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than `other`,
     *  else `false`.
     */
    function baseLt(value, other) {
      return value < other;
    }

    /**
     * The base implementation of `_.map` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} iteratee The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     */
    function baseMap(collection, iteratee) {
      var index = -1,
          result = isArrayLike(collection) ? Array(collection.length) : [];

      baseEach(collection, function(value, key, collection) {
        result[++index] = iteratee(value, key, collection);
      });
      return result;
    }

    /**
     * The base implementation of `_.matches` which doesn't clone `source`.
     *
     * @private
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new spec function.
     */
    function baseMatches(source) {
      var matchData = getMatchData(source);
      if (matchData.length == 1 && matchData[0][2]) {
        return matchesStrictComparable(matchData[0][0], matchData[0][1]);
      }
      return function(object) {
        return object === source || baseIsMatch(object, source, matchData);
      };
    }

    /**
     * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
     *
     * @private
     * @param {string} path The path of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     */
    function baseMatchesProperty(path, srcValue) {
      if (isKey(path) && isStrictComparable(srcValue)) {
        return matchesStrictComparable(toKey(path), srcValue);
      }
      return function(object) {
        var objValue = get(object, path);
        return (objValue === undefined && objValue === srcValue)
          ? hasIn(object, path)
          : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
      };
    }

    /**
     * The base implementation of `_.merge` without support for multiple sources.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {number} srcIndex The index of `source`.
     * @param {Function} [customizer] The function to customize merged values.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     */
    function baseMerge(object, source, srcIndex, customizer, stack) {
      if (object === source) {
        return;
      }
      baseFor(source, function(srcValue, key) {
        stack || (stack = new Stack);
        if (isObject(srcValue)) {
          baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
        }
        else {
          var newValue = customizer
            ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
            : undefined;

          if (newValue === undefined) {
            newValue = srcValue;
          }
          assignMergeValue(object, key, newValue);
        }
      }, keysIn);
    }

    /**
     * A specialized version of `baseMerge` for arrays and objects which performs
     * deep merges and tracks traversed objects enabling objects with circular
     * references to be merged.
     *
     * @private
     * @param {Object} object The destination object.
     * @param {Object} source The source object.
     * @param {string} key The key of the value to merge.
     * @param {number} srcIndex The index of `source`.
     * @param {Function} mergeFunc The function to merge values.
     * @param {Function} [customizer] The function to customize assigned values.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     */
    function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
      var objValue = safeGet(object, key),
          srcValue = safeGet(source, key),
          stacked = stack.get(srcValue);

      if (stacked) {
        assignMergeValue(object, key, stacked);
        return;
      }
      var newValue = customizer
        ? customizer(objValue, srcValue, (key + ''), object, source, stack)
        : undefined;

      var isCommon = newValue === undefined;

      if (isCommon) {
        var isArr = isArray(srcValue),
            isBuff = !isArr && isBuffer(srcValue),
            isTyped = !isArr && !isBuff && isTypedArray(srcValue);

        newValue = srcValue;
        if (isArr || isBuff || isTyped) {
          if (isArray(objValue)) {
            newValue = objValue;
          }
          else if (isArrayLikeObject(objValue)) {
            newValue = copyArray(objValue);
          }
          else if (isBuff) {
            isCommon = false;
            newValue = cloneBuffer(srcValue, true);
          }
          else if (isTyped) {
            isCommon = false;
            newValue = cloneTypedArray(srcValue, true);
          }
          else {
            newValue = [];
          }
        }
        else if (isPlainObject(srcValue) || isArguments(srcValue)) {
          newValue = objValue;
          if (isArguments(objValue)) {
            newValue = toPlainObject(objValue);
          }
          else if (!isObject(objValue) || isFunction(objValue)) {
            newValue = initCloneObject(srcValue);
          }
        }
        else {
          isCommon = false;
        }
      }
      if (isCommon) {
        // Recursively merge objects and arrays (susceptible to call stack limits).
        stack.set(srcValue, newValue);
        mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
        stack['delete'](srcValue);
      }
      assignMergeValue(object, key, newValue);
    }

    /**
     * The base implementation of `_.nth` which doesn't coerce arguments.
     *
     * @private
     * @param {Array} array The array to query.
     * @param {number} n The index of the element to return.
     * @returns {*} Returns the nth element of `array`.
     */
    function baseNth(array, n) {
      var length = array.length;
      if (!length) {
        return;
      }
      n += n < 0 ? length : 0;
      return isIndex(n, length) ? array[n] : undefined;
    }

    /**
     * The base implementation of `_.orderBy` without param guards.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
     * @param {string[]} orders The sort orders of `iteratees`.
     * @returns {Array} Returns the new sorted array.
     */
    function baseOrderBy(collection, iteratees, orders) {
      if (iteratees.length) {
        iteratees = arrayMap(iteratees, function(iteratee) {
          if (isArray(iteratee)) {
            return function(value) {
              return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
            }
          }
          return iteratee;
        });
      } else {
        iteratees = [identity];
      }

      var index = -1;
      iteratees = arrayMap(iteratees, baseUnary(getIteratee()));

      var result = baseMap(collection, function(value, key, collection) {
        var criteria = arrayMap(iteratees, function(iteratee) {
          return iteratee(value);
        });
        return { 'criteria': criteria, 'index': ++index, 'value': value };
      });

      return baseSortBy(result, function(object, other) {
        return compareMultiple(object, other, orders);
      });
    }

    /**
     * The base implementation of `_.pick` without support for individual
     * property identifiers.
     *
     * @private
     * @param {Object} object The source object.
     * @param {string[]} paths The property paths to pick.
     * @returns {Object} Returns the new object.
     */
    function basePick(object, paths) {
      return basePickBy(object, paths, function(value, path) {
        return hasIn(object, path);
      });
    }

    /**
     * The base implementation of  `_.pickBy` without support for iteratee shorthands.
     *
     * @private
     * @param {Object} object The source object.
     * @param {string[]} paths The property paths to pick.
     * @param {Function} predicate The function invoked per property.
     * @returns {Object} Returns the new object.
     */
    function basePickBy(object, paths, predicate) {
      var index = -1,
          length = paths.length,
          result = {};

      while (++index < length) {
        var path = paths[index],
            value = baseGet(object, path);

        if (predicate(value, path)) {
          baseSet(result, castPath(path, object), value);
        }
      }
      return result;
    }

    /**
     * A specialized version of `baseProperty` which supports deep paths.
     *
     * @private
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new accessor function.
     */
    function basePropertyDeep(path) {
      return function(object) {
        return baseGet(object, path);
      };
    }

    /**
     * The base implementation of `_.pullAllBy` without support for iteratee
     * shorthands.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns `array`.
     */
    function basePullAll(array, values, iteratee, comparator) {
      var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
          index = -1,
          length = values.length,
          seen = array;

      if (array === values) {
        values = copyArray(values);
      }
      if (iteratee) {
        seen = arrayMap(array, baseUnary(iteratee));
      }
      while (++index < length) {
        var fromIndex = 0,
            value = values[index],
            computed = iteratee ? iteratee(value) : value;

        while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
          if (seen !== array) {
            splice.call(seen, fromIndex, 1);
          }
          splice.call(array, fromIndex, 1);
        }
      }
      return array;
    }

    /**
     * The base implementation of `_.pullAt` without support for individual
     * indexes or capturing the removed elements.
     *
     * @private
     * @param {Array} array The array to modify.
     * @param {number[]} indexes The indexes of elements to remove.
     * @returns {Array} Returns `array`.
     */
    function basePullAt(array, indexes) {
      var length = array ? indexes.length : 0,
          lastIndex = length - 1;

      while (length--) {
        var index = indexes[length];
        if (length == lastIndex || index !== previous) {
          var previous = index;
          if (isIndex(index)) {
            splice.call(array, index, 1);
          } else {
            baseUnset(array, index);
          }
        }
      }
      return array;
    }

    /**
     * The base implementation of `_.random` without support for returning
     * floating-point numbers.
     *
     * @private
     * @param {number} lower The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the random number.
     */
    function baseRandom(lower, upper) {
      return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
    }

    /**
     * The base implementation of `_.range` and `_.rangeRight` which doesn't
     * coerce arguments.
     *
     * @private
     * @param {number} start The start of the range.
     * @param {number} end The end of the range.
     * @param {number} step The value to increment or decrement by.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Array} Returns the range of numbers.
     */
    function baseRange(start, end, step, fromRight) {
      var index = -1,
          length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
          result = Array(length);

      while (length--) {
        result[fromRight ? length : ++index] = start;
        start += step;
      }
      return result;
    }

    /**
     * The base implementation of `_.repeat` which doesn't coerce arguments.
     *
     * @private
     * @param {string} string The string to repeat.
     * @param {number} n The number of times to repeat the string.
     * @returns {string} Returns the repeated string.
     */
    function baseRepeat(string, n) {
      var result = '';
      if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
        return result;
      }
      // Leverage the exponentiation by squaring algorithm for a faster repeat.
      // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
      do {
        if (n % 2) {
          result += string;
        }
        n = nativeFloor(n / 2);
        if (n) {
          string += string;
        }
      } while (n);

      return result;
    }

    /**
     * The base implementation of `_.rest` which doesn't validate or coerce arguments.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @returns {Function} Returns the new function.
     */
    function baseRest(func, start) {
      return setToString(overRest(func, start, identity), func + '');
    }

    /**
     * The base implementation of `_.sample`.
     *
     * @private
     * @param {Array|Object} collection The collection to sample.
     * @returns {*} Returns the random element.
     */
    function baseSample(collection) {
      return arraySample(values(collection));
    }

    /**
     * The base implementation of `_.sampleSize` without param guards.
     *
     * @private
     * @param {Array|Object} collection The collection to sample.
     * @param {number} n The number of elements to sample.
     * @returns {Array} Returns the random elements.
     */
    function baseSampleSize(collection, n) {
      var array = values(collection);
      return shuffleSelf(array, baseClamp(n, 0, array.length));
    }

    /**
     * The base implementation of `_.set`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @param {Function} [customizer] The function to customize path creation.
     * @returns {Object} Returns `object`.
     */
    function baseSet(object, path, value, customizer) {
      if (!isObject(object)) {
        return object;
      }
      path = castPath(path, object);

      var index = -1,
          length = path.length,
          lastIndex = length - 1,
          nested = object;

      while (nested != null && ++index < length) {
        var key = toKey(path[index]),
            newValue = value;

        if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
          return object;
        }

        if (index != lastIndex) {
          var objValue = nested[key];
          newValue = customizer ? customizer(objValue, key, nested) : undefined;
          if (newValue === undefined) {
            newValue = isObject(objValue)
              ? objValue
              : (isIndex(path[index + 1]) ? [] : {});
          }
        }
        assignValue(nested, key, newValue);
        nested = nested[key];
      }
      return object;
    }

    /**
     * The base implementation of `setData` without support for hot loop shorting.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var baseSetData = !metaMap ? identity : function(func, data) {
      metaMap.set(func, data);
      return func;
    };

    /**
     * The base implementation of `setToString` without support for hot loop shorting.
     *
     * @private
     * @param {Function} func The function to modify.
     * @param {Function} string The `toString` result.
     * @returns {Function} Returns `func`.
     */
    var baseSetToString = !defineProperty ? identity : function(func, string) {
      return defineProperty(func, 'toString', {
        'configurable': true,
        'enumerable': false,
        'value': constant(string),
        'writable': true
      });
    };

    /**
     * The base implementation of `_.shuffle`.
     *
     * @private
     * @param {Array|Object} collection The collection to shuffle.
     * @returns {Array} Returns the new shuffled array.
     */
    function baseShuffle(collection) {
      return shuffleSelf(values(collection));
    }

    /**
     * The base implementation of `_.slice` without an iteratee call guard.
     *
     * @private
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseSlice(array, start, end) {
      var index = -1,
          length = array.length;

      if (start < 0) {
        start = -start > length ? 0 : (length + start);
      }
      end = end > length ? length : end;
      if (end < 0) {
        end += length;
      }
      length = start > end ? 0 : ((end - start) >>> 0);
      start >>>= 0;

      var result = Array(length);
      while (++index < length) {
        result[index] = array[index + start];
      }
      return result;
    }

    /**
     * The base implementation of `_.some` without support for iteratee shorthands.
     *
     * @private
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} predicate The function invoked per iteration.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     */
    function baseSome(collection, predicate) {
      var result;

      baseEach(collection, function(value, index, collection) {
        result = predicate(value, index, collection);
        return !result;
      });
      return !!result;
    }

    /**
     * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
     * performs a binary search of `array` to determine the index at which `value`
     * should be inserted into `array` in order to maintain its sort order.
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function baseSortedIndex(array, value, retHighest) {
      var low = 0,
          high = array == null ? low : array.length;

      if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
        while (low < high) {
          var mid = (low + high) >>> 1,
              computed = array[mid];

          if (computed !== null && !isSymbol(computed) &&
              (retHighest ? (computed <= value) : (computed < value))) {
            low = mid + 1;
          } else {
            high = mid;
          }
        }
        return high;
      }
      return baseSortedIndexBy(array, value, identity, retHighest);
    }

    /**
     * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
     * which invokes `iteratee` for `value` and each element of `array` to compute
     * their sort ranking. The iteratee is invoked with one argument; (value).
     *
     * @private
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} iteratee The iteratee invoked per element.
     * @param {boolean} [retHighest] Specify returning the highest qualified index.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     */
    function baseSortedIndexBy(array, value, iteratee, retHighest) {
      var low = 0,
          high = array == null ? 0 : array.length;
      if (high === 0) {
        return 0;
      }

      value = iteratee(value);
      var valIsNaN = value !== value,
          valIsNull = value === null,
          valIsSymbol = isSymbol(value),
          valIsUndefined = value === undefined;

      while (low < high) {
        var mid = nativeFloor((low + high) / 2),
            computed = iteratee(array[mid]),
            othIsDefined = computed !== undefined,
            othIsNull = computed === null,
            othIsReflexive = computed === computed,
            othIsSymbol = isSymbol(computed);

        if (valIsNaN) {
          var setLow = retHighest || othIsReflexive;
        } else if (valIsUndefined) {
          setLow = othIsReflexive && (retHighest || othIsDefined);
        } else if (valIsNull) {
          setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
        } else if (valIsSymbol) {
          setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
        } else if (othIsNull || othIsSymbol) {
          setLow = false;
        } else {
          setLow = retHighest ? (computed <= value) : (computed < value);
        }
        if (setLow) {
          low = mid + 1;
        } else {
          high = mid;
        }
      }
      return nativeMin(high, MAX_ARRAY_INDEX);
    }

    /**
     * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
     * support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     */
    function baseSortedUniq(array, iteratee) {
      var index = -1,
          length = array.length,
          resIndex = 0,
          result = [];

      while (++index < length) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        if (!index || !eq(computed, seen)) {
          var seen = computed;
          result[resIndex++] = value === 0 ? 0 : value;
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.toNumber` which doesn't ensure correct
     * conversions of binary, hexadecimal, or octal string values.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {number} Returns the number.
     */
    function baseToNumber(value) {
      if (typeof value == 'number') {
        return value;
      }
      if (isSymbol(value)) {
        return NAN;
      }
      return +value;
    }

    /**
     * The base implementation of `_.toString` which doesn't convert nullish
     * values to empty strings.
     *
     * @private
     * @param {*} value The value to process.
     * @returns {string} Returns the string.
     */
    function baseToString(value) {
      // Exit early for strings to avoid a performance hit in some environments.
      if (typeof value == 'string') {
        return value;
      }
      if (isArray(value)) {
        // Recursively convert values (susceptible to call stack limits).
        return arrayMap(value, baseToString) + '';
      }
      if (isSymbol(value)) {
        return symbolToString ? symbolToString.call(value) : '';
      }
      var result = (value + '');
      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
    }

    /**
     * The base implementation of `_.uniqBy` without support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     */
    function baseUniq(array, iteratee, comparator) {
      var index = -1,
          includes = arrayIncludes,
          length = array.length,
          isCommon = true,
          result = [],
          seen = result;

      if (comparator) {
        isCommon = false;
        includes = arrayIncludesWith;
      }
      else if (length >= LARGE_ARRAY_SIZE) {
        var set = iteratee ? null : createSet(array);
        if (set) {
          return setToArray(set);
        }
        isCommon = false;
        includes = cacheHas;
        seen = new SetCache;
      }
      else {
        seen = iteratee ? [] : result;
      }
      outer:
      while (++index < length) {
        var value = array[index],
            computed = iteratee ? iteratee(value) : value;

        value = (comparator || value !== 0) ? value : 0;
        if (isCommon && computed === computed) {
          var seenIndex = seen.length;
          while (seenIndex--) {
            if (seen[seenIndex] === computed) {
              continue outer;
            }
          }
          if (iteratee) {
            seen.push(computed);
          }
          result.push(value);
        }
        else if (!includes(seen, computed, comparator)) {
          if (seen !== result) {
            seen.push(computed);
          }
          result.push(value);
        }
      }
      return result;
    }

    /**
     * The base implementation of `_.unset`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The property path to unset.
     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
     */
    function baseUnset(object, path) {
      path = castPath(path, object);
      object = parent(object, path);
      return object == null || delete object[toKey(last(path))];
    }

    /**
     * The base implementation of `_.update`.
     *
     * @private
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to update.
     * @param {Function} updater The function to produce the updated value.
     * @param {Function} [customizer] The function to customize path creation.
     * @returns {Object} Returns `object`.
     */
    function baseUpdate(object, path, updater, customizer) {
      return baseSet(object, path, updater(baseGet(object, path)), customizer);
    }

    /**
     * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
     * without support for iteratee shorthands.
     *
     * @private
     * @param {Array} array The array to query.
     * @param {Function} predicate The function invoked per iteration.
     * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Array} Returns the slice of `array`.
     */
    function baseWhile(array, predicate, isDrop, fromRight) {
      var length = array.length,
          index = fromRight ? length : -1;

      while ((fromRight ? index-- : ++index < length) &&
        predicate(array[index], index, array)) {}

      return isDrop
        ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
        : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
    }

    /**
     * The base implementation of `wrapperValue` which returns the result of
     * performing a sequence of actions on the unwrapped `value`, where each
     * successive action is supplied the return value of the previous.
     *
     * @private
     * @param {*} value The unwrapped value.
     * @param {Array} actions Actions to perform to resolve the unwrapped value.
     * @returns {*} Returns the resolved value.
     */
    function baseWrapperValue(value, actions) {
      var result = value;
      if (result instanceof LazyWrapper) {
        result = result.value();
      }
      return arrayReduce(actions, function(result, action) {
        return action.func.apply(action.thisArg, arrayPush([result], action.args));
      }, result);
    }

    /**
     * The base implementation of methods like `_.xor`, without support for
     * iteratee shorthands, that accepts an array of arrays to inspect.
     *
     * @private
     * @param {Array} arrays The arrays to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of values.
     */
    function baseXor(arrays, iteratee, comparator) {
      var length = arrays.length;
      if (length < 2) {
        return length ? baseUniq(arrays[0]) : [];
      }
      var index = -1,
          result = Array(length);

      while (++index < length) {
        var array = arrays[index],
            othIndex = -1;

        while (++othIndex < length) {
          if (othIndex != index) {
            result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
          }
        }
      }
      return baseUniq(baseFlatten(result, 1), iteratee, comparator);
    }

    /**
     * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
     *
     * @private
     * @param {Array} props The property identifiers.
     * @param {Array} values The property values.
     * @param {Function} assignFunc The function to assign values.
     * @returns {Object} Returns the new object.
     */
    function baseZipObject(props, values, assignFunc) {
      var index = -1,
          length = props.length,
          valsLength = values.length,
          result = {};

      while (++index < length) {
        var value = index < valsLength ? values[index] : undefined;
        assignFunc(result, props[index], value);
      }
      return result;
    }

    /**
     * Casts `value` to an empty array if it's not an array like object.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {Array|Object} Returns the cast array-like object.
     */
    function castArrayLikeObject(value) {
      return isArrayLikeObject(value) ? value : [];
    }

    /**
     * Casts `value` to `identity` if it's not a function.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {Function} Returns cast function.
     */
    function castFunction(value) {
      return typeof value == 'function' ? value : identity;
    }

    /**
     * Casts `value` to a path array if it's not one.
     *
     * @private
     * @param {*} value The value to inspect.
     * @param {Object} [object] The object to query keys on.
     * @returns {Array} Returns the cast property path array.
     */
    function castPath(value, object) {
      if (isArray(value)) {
        return value;
      }
      return isKey(value, object) ? [value] : stringToPath(toString(value));
    }

    /**
     * A `baseRest` alias which can be replaced with `identity` by module
     * replacement plugins.
     *
     * @private
     * @type {Function}
     * @param {Function} func The function to apply a rest parameter to.
     * @returns {Function} Returns the new function.
     */
    var castRest = baseRest;

    /**
     * Casts `array` to a slice if it's needed.
     *
     * @private
     * @param {Array} array The array to inspect.
     * @param {number} start The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the cast slice.
     */
    function castSlice(array, start, end) {
      var length = array.length;
      end = end === undefined ? length : end;
      return (!start && end >= length) ? array : baseSlice(array, start, end);
    }

    /**
     * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
     *
     * @private
     * @param {number|Object} id The timer id or timeout object of the timer to clear.
     */
    var clearTimeout = ctxClearTimeout || function(id) {
      return root.clearTimeout(id);
    };

    /**
     * Creates a clone of  `buffer`.
     *
     * @private
     * @param {Buffer} buffer The buffer to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Buffer} Returns the cloned buffer.
     */
    function cloneBuffer(buffer, isDeep) {
      if (isDeep) {
        return buffer.slice();
      }
      var length = buffer.length,
          result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);

      buffer.copy(result);
      return result;
    }

    /**
     * Creates a clone of `arrayBuffer`.
     *
     * @private
     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
     * @returns {ArrayBuffer} Returns the cloned array buffer.
     */
    function cloneArrayBuffer(arrayBuffer) {
      var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
      new Uint8Array(result).set(new Uint8Array(arrayBuffer));
      return result;
    }

    /**
     * Creates a clone of `dataView`.
     *
     * @private
     * @param {Object} dataView The data view to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the cloned data view.
     */
    function cloneDataView(dataView, isDeep) {
      var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
      return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
    }

    /**
     * Creates a clone of `regexp`.
     *
     * @private
     * @param {Object} regexp The regexp to clone.
     * @returns {Object} Returns the cloned regexp.
     */
    function cloneRegExp(regexp) {
      var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
      result.lastIndex = regexp.lastIndex;
      return result;
    }

    /**
     * Creates a clone of the `symbol` object.
     *
     * @private
     * @param {Object} symbol The symbol object to clone.
     * @returns {Object} Returns the cloned symbol object.
     */
    function cloneSymbol(symbol) {
      return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
    }

    /**
     * Creates a clone of `typedArray`.
     *
     * @private
     * @param {Object} typedArray The typed array to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the cloned typed array.
     */
    function cloneTypedArray(typedArray, isDeep) {
      var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
      return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
    }

    /**
     * Compares values to sort them in ascending order.
     *
     * @private
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {number} Returns the sort order indicator for `value`.
     */
    function compareAscending(value, other) {
      if (value !== other) {
        var valIsDefined = value !== undefined,
            valIsNull = value === null,
            valIsReflexive = value === value,
            valIsSymbol = isSymbol(value);

        var othIsDefined = other !== undefined,
            othIsNull = other === null,
            othIsReflexive = other === other,
            othIsSymbol = isSymbol(other);

        if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
            (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
            (valIsNull && othIsDefined && othIsReflexive) ||
            (!valIsDefined && othIsReflexive) ||
            !valIsReflexive) {
          return 1;
        }
        if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
            (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
            (othIsNull && valIsDefined && valIsReflexive) ||
            (!othIsDefined && valIsReflexive) ||
            !othIsReflexive) {
          return -1;
        }
      }
      return 0;
    }

    /**
     * Used by `_.orderBy` to compare multiple properties of a value to another
     * and stable sort them.
     *
     * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
     * specify an order of "desc" for descending or "asc" for ascending sort order
     * of corresponding values.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {boolean[]|string[]} orders The order to sort by for each property.
     * @returns {number} Returns the sort order indicator for `object`.
     */
    function compareMultiple(object, other, orders) {
      var index = -1,
          objCriteria = object.criteria,
          othCriteria = other.criteria,
          length = objCriteria.length,
          ordersLength = orders.length;

      while (++index < length) {
        var result = compareAscending(objCriteria[index], othCriteria[index]);
        if (result) {
          if (index >= ordersLength) {
            return result;
          }
          var order = orders[index];
          return result * (order == 'desc' ? -1 : 1);
        }
      }
      // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
      // that causes it, under certain circumstances, to provide the same value for
      // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
      // for more details.
      //
      // This also ensures a stable sort in V8 and other engines.
      // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
      return object.index - other.index;
    }

    /**
     * Creates an array that is the composition of partially applied arguments,
     * placeholders, and provided arguments into a single array of arguments.
     *
     * @private
     * @param {Array} args The provided arguments.
     * @param {Array} partials The arguments to prepend to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @params {boolean} [isCurried] Specify composing for a curried function.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgs(args, partials, holders, isCurried) {
      var argsIndex = -1,
          argsLength = args.length,
          holdersLength = holders.length,
          leftIndex = -1,
          leftLength = partials.length,
          rangeLength = nativeMax(argsLength - holdersLength, 0),
          result = Array(leftLength + rangeLength),
          isUncurried = !isCurried;

      while (++leftIndex < leftLength) {
        result[leftIndex] = partials[leftIndex];
      }
      while (++argsIndex < holdersLength) {
        if (isUncurried || argsIndex < argsLength) {
          result[holders[argsIndex]] = args[argsIndex];
        }
      }
      while (rangeLength--) {
        result[leftIndex++] = args[argsIndex++];
      }
      return result;
    }

    /**
     * This function is like `composeArgs` except that the arguments composition
     * is tailored for `_.partialRight`.
     *
     * @private
     * @param {Array} args The provided arguments.
     * @param {Array} partials The arguments to append to those provided.
     * @param {Array} holders The `partials` placeholder indexes.
     * @params {boolean} [isCurried] Specify composing for a curried function.
     * @returns {Array} Returns the new array of composed arguments.
     */
    function composeArgsRight(args, partials, holders, isCurried) {
      var argsIndex = -1,
          argsLength = args.length,
          holdersIndex = -1,
          holdersLength = holders.length,
          rightIndex = -1,
          rightLength = partials.length,
          rangeLength = nativeMax(argsLength - holdersLength, 0),
          result = Array(rangeLength + rightLength),
          isUncurried = !isCurried;

      while (++argsIndex < rangeLength) {
        result[argsIndex] = args[argsIndex];
      }
      var offset = argsIndex;
      while (++rightIndex < rightLength) {
        result[offset + rightIndex] = partials[rightIndex];
      }
      while (++holdersIndex < holdersLength) {
        if (isUncurried || argsIndex < argsLength) {
          result[offset + holders[holdersIndex]] = args[argsIndex++];
        }
      }
      return result;
    }

    /**
     * Copies the values of `source` to `array`.
     *
     * @private
     * @param {Array} source The array to copy values from.
     * @param {Array} [array=[]] The array to copy values to.
     * @returns {Array} Returns `array`.
     */
    function copyArray(source, array) {
      var index = -1,
          length = source.length;

      array || (array = Array(length));
      while (++index < length) {
        array[index] = source[index];
      }
      return array;
    }

    /**
     * Copies properties of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy properties from.
     * @param {Array} props The property identifiers to copy.
     * @param {Object} [object={}] The object to copy properties to.
     * @param {Function} [customizer] The function to customize copied values.
     * @returns {Object} Returns `object`.
     */
    function copyObject(source, props, object, customizer) {
      var isNew = !object;
      object || (object = {});

      var index = -1,
          length = props.length;

      while (++index < length) {
        var key = props[index];

        var newValue = customizer
          ? customizer(object[key], source[key], key, object, source)
          : undefined;

        if (newValue === undefined) {
          newValue = source[key];
        }
        if (isNew) {
          baseAssignValue(object, key, newValue);
        } else {
          assignValue(object, key, newValue);
        }
      }
      return object;
    }

    /**
     * Copies own symbols of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy symbols from.
     * @param {Object} [object={}] The object to copy symbols to.
     * @returns {Object} Returns `object`.
     */
    function copySymbols(source, object) {
      return copyObject(source, getSymbols(source), object);
    }

    /**
     * Copies own and inherited symbols of `source` to `object`.
     *
     * @private
     * @param {Object} source The object to copy symbols from.
     * @param {Object} [object={}] The object to copy symbols to.
     * @returns {Object} Returns `object`.
     */
    function copySymbolsIn(source, object) {
      return copyObject(source, getSymbolsIn(source), object);
    }

    /**
     * Creates a function like `_.groupBy`.
     *
     * @private
     * @param {Function} setter The function to set accumulator values.
     * @param {Function} [initializer] The accumulator object initializer.
     * @returns {Function} Returns the new aggregator function.
     */
    function createAggregator(setter, initializer) {
      return function(collection, iteratee) {
        var func = isArray(collection) ? arrayAggregator : baseAggregator,
            accumulator = initializer ? initializer() : {};

        return func(collection, setter, getIteratee(iteratee, 2), accumulator);
      };
    }

    /**
     * Creates a function like `_.assign`.
     *
     * @private
     * @param {Function} assigner The function to assign values.
     * @returns {Function} Returns the new assigner function.
     */
    function createAssigner(assigner) {
      return baseRest(function(object, sources) {
        var index = -1,
            length = sources.length,
            customizer = length > 1 ? sources[length - 1] : undefined,
            guard = length > 2 ? sources[2] : undefined;

        customizer = (assigner.length > 3 && typeof customizer == 'function')
          ? (length--, customizer)
          : undefined;

        if (guard && isIterateeCall(sources[0], sources[1], guard)) {
          customizer = length < 3 ? undefined : customizer;
          length = 1;
        }
        object = Object(object);
        while (++index < length) {
          var source = sources[index];
          if (source) {
            assigner(object, source, index, customizer);
          }
        }
        return object;
      });
    }

    /**
     * Creates a `baseEach` or `baseEachRight` function.
     *
     * @private
     * @param {Function} eachFunc The function to iterate over a collection.
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseEach(eachFunc, fromRight) {
      return function(collection, iteratee) {
        if (collection == null) {
          return collection;
        }
        if (!isArrayLike(collection)) {
          return eachFunc(collection, iteratee);
        }
        var length = collection.length,
            index = fromRight ? length : -1,
            iterable = Object(collection);

        while ((fromRight ? index-- : ++index < length)) {
          if (iteratee(iterable[index], index, iterable) === false) {
            break;
          }
        }
        return collection;
      };
    }

    /**
     * Creates a base function for methods like `_.forIn` and `_.forOwn`.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new base function.
     */
    function createBaseFor(fromRight) {
      return function(object, iteratee, keysFunc) {
        var index = -1,
            iterable = Object(object),
            props = keysFunc(object),
            length = props.length;

        while (length--) {
          var key = props[fromRight ? length : ++index];
          if (iteratee(iterable[key], key, iterable) === false) {
            break;
          }
        }
        return object;
      };
    }

    /**
     * Creates a function that wraps `func` to invoke it with the optional `this`
     * binding of `thisArg`.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createBind(func, bitmask, thisArg) {
      var isBind = bitmask & WRAP_BIND_FLAG,
          Ctor = createCtor(func);

      function wrapper() {
        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
        return fn.apply(isBind ? thisArg : this, arguments);
      }
      return wrapper;
    }

    /**
     * Creates a function like `_.lowerFirst`.
     *
     * @private
     * @param {string} methodName The name of the `String` case method to use.
     * @returns {Function} Returns the new case function.
     */
    function createCaseFirst(methodName) {
      return function(string) {
        string = toString(string);

        var strSymbols = hasUnicode(string)
          ? stringToArray(string)
          : undefined;

        var chr = strSymbols
          ? strSymbols[0]
          : string.charAt(0);

        var trailing = strSymbols
          ? castSlice(strSymbols, 1).join('')
          : string.slice(1);

        return chr[methodName]() + trailing;
      };
    }

    /**
     * Creates a function like `_.camelCase`.
     *
     * @private
     * @param {Function} callback The function to combine each word.
     * @returns {Function} Returns the new compounder function.
     */
    function createCompounder(callback) {
      return function(string) {
        return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
      };
    }

    /**
     * Creates a function that produces an instance of `Ctor` regardless of
     * whether it was invoked as part of a `new` expression or by `call` or `apply`.
     *
     * @private
     * @param {Function} Ctor The constructor to wrap.
     * @returns {Function} Returns the new wrapped function.
     */
    function createCtor(Ctor) {
      return function() {
        // Use a `switch` statement to work with class constructors. See
        // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
        // for more details.
        var args = arguments;
        switch (args.length) {
          case 0: return new Ctor;
          case 1: return new Ctor(args[0]);
          case 2: return new Ctor(args[0], args[1]);
          case 3: return new Ctor(args[0], args[1], args[2]);
          case 4: return new Ctor(args[0], args[1], args[2], args[3]);
          case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
          case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
          case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
        }
        var thisBinding = baseCreate(Ctor.prototype),
            result = Ctor.apply(thisBinding, args);

        // Mimic the constructor's `return` behavior.
        // See https://es5.github.io/#x13.2.2 for more details.
        return isObject(result) ? result : thisBinding;
      };
    }

    /**
     * Creates a function that wraps `func` to enable currying.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {number} arity The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createCurry(func, bitmask, arity) {
      var Ctor = createCtor(func);

      function wrapper() {
        var length = arguments.length,
            args = Array(length),
            index = length,
            placeholder = getHolder(wrapper);

        while (index--) {
          args[index] = arguments[index];
        }
        var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
          ? []
          : replaceHolders(args, placeholder);

        length -= holders.length;
        if (length < arity) {
          return createRecurry(
            func, bitmask, createHybrid, wrapper.placeholder, undefined,
            args, holders, undefined, undefined, arity - length);
        }
        var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
        return apply(fn, this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.find` or `_.findLast` function.
     *
     * @private
     * @param {Function} findIndexFunc The function to find the collection index.
     * @returns {Function} Returns the new find function.
     */
    function createFind(findIndexFunc) {
      return function(collection, predicate, fromIndex) {
        var iterable = Object(collection);
        if (!isArrayLike(collection)) {
          var iteratee = getIteratee(predicate, 3);
          collection = keys(collection);
          predicate = function(key) { return iteratee(iterable[key], key, iterable); };
        }
        var index = findIndexFunc(collection, predicate, fromIndex);
        return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
      };
    }

    /**
     * Creates a `_.flow` or `_.flowRight` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new flow function.
     */
    function createFlow(fromRight) {
      return flatRest(function(funcs) {
        var length = funcs.length,
            index = length,
            prereq = LodashWrapper.prototype.thru;

        if (fromRight) {
          funcs.reverse();
        }
        while (index--) {
          var func = funcs[index];
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
            var wrapper = new LodashWrapper([], true);
          }
        }
        index = wrapper ? index : length;
        while (++index < length) {
          func = funcs[index];

          var funcName = getFuncName(func),
              data = funcName == 'wrapper' ? getData(func) : undefined;

          if (data && isLaziable(data[0]) &&
                data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
                !data[4].length && data[9] == 1
              ) {
            wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
          } else {
            wrapper = (func.length == 1 && isLaziable(func))
              ? wrapper[funcName]()
              : wrapper.thru(func);
          }
        }
        return function() {
          var args = arguments,
              value = args[0];

          if (wrapper && args.length == 1 && isArray(value)) {
            return wrapper.plant(value).value();
          }
          var index = 0,
              result = length ? funcs[index].apply(this, args) : value;

          while (++index < length) {
            result = funcs[index].call(this, result);
          }
          return result;
        };
      });
    }

    /**
     * Creates a function that wraps `func` to invoke it with optional `this`
     * binding of `thisArg`, partial application, and currying.
     *
     * @private
     * @param {Function|string} func The function or method name to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to prepend to those provided to
     *  the new function.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [partialsRight] The arguments to append to those provided
     *  to the new function.
     * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
      var isAry = bitmask & WRAP_ARY_FLAG,
          isBind = bitmask & WRAP_BIND_FLAG,
          isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
          isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
          isFlip = bitmask & WRAP_FLIP_FLAG,
          Ctor = isBindKey ? undefined : createCtor(func);

      function wrapper() {
        var length = arguments.length,
            args = Array(length),
            index = length;

        while (index--) {
          args[index] = arguments[index];
        }
        if (isCurried) {
          var placeholder = getHolder(wrapper),
              holdersCount = countHolders(args, placeholder);
        }
        if (partials) {
          args = composeArgs(args, partials, holders, isCurried);
        }
        if (partialsRight) {
          args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
        }
        length -= holdersCount;
        if (isCurried && length < arity) {
          var newHolders = replaceHolders(args, placeholder);
          return createRecurry(
            func, bitmask, createHybrid, wrapper.placeholder, thisArg,
            args, newHolders, argPos, ary, arity - length
          );
        }
        var thisBinding = isBind ? thisArg : this,
            fn = isBindKey ? thisBinding[func] : func;

        length = args.length;
        if (argPos) {
          args = reorder(args, argPos);
        } else if (isFlip && length > 1) {
          args.reverse();
        }
        if (isAry && ary < length) {
          args.length = ary;
        }
        if (this && this !== root && this instanceof wrapper) {
          fn = Ctor || createCtor(fn);
        }
        return fn.apply(thisBinding, args);
      }
      return wrapper;
    }

    /**
     * Creates a function like `_.invertBy`.
     *
     * @private
     * @param {Function} setter The function to set accumulator values.
     * @param {Function} toIteratee The function to resolve iteratees.
     * @returns {Function} Returns the new inverter function.
     */
    function createInverter(setter, toIteratee) {
      return function(object, iteratee) {
        return baseInverter(object, setter, toIteratee(iteratee), {});
      };
    }

    /**
     * Creates a function that performs a mathematical operation on two values.
     *
     * @private
     * @param {Function} operator The function to perform the operation.
     * @param {number} [defaultValue] The value used for `undefined` arguments.
     * @returns {Function} Returns the new mathematical operation function.
     */
    function createMathOperation(operator, defaultValue) {
      return function(value, other) {
        var result;
        if (value === undefined && other === undefined) {
          return defaultValue;
        }
        if (value !== undefined) {
          result = value;
        }
        if (other !== undefined) {
          if (result === undefined) {
            return other;
          }
          if (typeof value == 'string' || typeof other == 'string') {
            value = baseToString(value);
            other = baseToString(other);
          } else {
            value = baseToNumber(value);
            other = baseToNumber(other);
          }
          result = operator(value, other);
        }
        return result;
      };
    }

    /**
     * Creates a function like `_.over`.
     *
     * @private
     * @param {Function} arrayFunc The function to iterate over iteratees.
     * @returns {Function} Returns the new over function.
     */
    function createOver(arrayFunc) {
      return flatRest(function(iteratees) {
        iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
        return baseRest(function(args) {
          var thisArg = this;
          return arrayFunc(iteratees, function(iteratee) {
            return apply(iteratee, thisArg, args);
          });
        });
      });
    }

    /**
     * Creates the padding for `string` based on `length`. The `chars` string
     * is truncated if the number of characters exceeds `length`.
     *
     * @private
     * @param {number} length The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padding for `string`.
     */
    function createPadding(length, chars) {
      chars = chars === undefined ? ' ' : baseToString(chars);

      var charsLength = chars.length;
      if (charsLength < 2) {
        return charsLength ? baseRepeat(chars, length) : chars;
      }
      var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
      return hasUnicode(chars)
        ? castSlice(stringToArray(result), 0, length).join('')
        : result.slice(0, length);
    }

    /**
     * Creates a function that wraps `func` to invoke it with the `this` binding
     * of `thisArg` and `partials` prepended to the arguments it receives.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {Array} partials The arguments to prepend to those provided to
     *  the new function.
     * @returns {Function} Returns the new wrapped function.
     */
    function createPartial(func, bitmask, thisArg, partials) {
      var isBind = bitmask & WRAP_BIND_FLAG,
          Ctor = createCtor(func);

      function wrapper() {
        var argsIndex = -1,
            argsLength = arguments.length,
            leftIndex = -1,
            leftLength = partials.length,
            args = Array(leftLength + argsLength),
            fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;

        while (++leftIndex < leftLength) {
          args[leftIndex] = partials[leftIndex];
        }
        while (argsLength--) {
          args[leftIndex++] = arguments[++argsIndex];
        }
        return apply(fn, isBind ? thisArg : this, args);
      }
      return wrapper;
    }

    /**
     * Creates a `_.range` or `_.rangeRight` function.
     *
     * @private
     * @param {boolean} [fromRight] Specify iterating from right to left.
     * @returns {Function} Returns the new range function.
     */
    function createRange(fromRight) {
      return function(start, end, step) {
        if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
          end = step = undefined;
        }
        // Ensure the sign of `-0` is preserved.
        start = toFinite(start);
        if (end === undefined) {
          end = start;
          start = 0;
        } else {
          end = toFinite(end);
        }
        step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
        return baseRange(start, end, step, fromRight);
      };
    }

    /**
     * Creates a function that performs a relational operation on two values.
     *
     * @private
     * @param {Function} operator The function to perform the operation.
     * @returns {Function} Returns the new relational operation function.
     */
    function createRelationalOperation(operator) {
      return function(value, other) {
        if (!(typeof value == 'string' && typeof other == 'string')) {
          value = toNumber(value);
          other = toNumber(other);
        }
        return operator(value, other);
      };
    }

    /**
     * Creates a function that wraps `func` to continue currying.
     *
     * @private
     * @param {Function} func The function to wrap.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @param {Function} wrapFunc The function to create the `func` wrapper.
     * @param {*} placeholder The placeholder value.
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to prepend to those provided to
     *  the new function.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
      var isCurry = bitmask & WRAP_CURRY_FLAG,
          newHolders = isCurry ? holders : undefined,
          newHoldersRight = isCurry ? undefined : holders,
          newPartials = isCurry ? partials : undefined,
          newPartialsRight = isCurry ? undefined : partials;

      bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
      bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);

      if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
        bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
      }
      var newData = [
        func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
        newHoldersRight, argPos, ary, arity
      ];

      var result = wrapFunc.apply(undefined, newData);
      if (isLaziable(func)) {
        setData(result, newData);
      }
      result.placeholder = placeholder;
      return setWrapToString(result, func, bitmask);
    }

    /**
     * Creates a function like `_.round`.
     *
     * @private
     * @param {string} methodName The name of the `Math` method to use when rounding.
     * @returns {Function} Returns the new round function.
     */
    function createRound(methodName) {
      var func = Math[methodName];
      return function(number, precision) {
        number = toNumber(number);
        precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
        if (precision && nativeIsFinite(number)) {
          // Shift with exponential notation to avoid floating-point issues.
          // See [MDN](https://mdn.io/round#Examples) for more details.
          var pair = (toString(number) + 'e').split('e'),
              value = func(pair[0] + 'e' + (+pair[1] + precision));

          pair = (toString(value) + 'e').split('e');
          return +(pair[0] + 'e' + (+pair[1] - precision));
        }
        return func(number);
      };
    }

    /**
     * Creates a set object of `values`.
     *
     * @private
     * @param {Array} values The values to add to the set.
     * @returns {Object} Returns the new set.
     */
    var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
      return new Set(values);
    };

    /**
     * Creates a `_.toPairs` or `_.toPairsIn` function.
     *
     * @private
     * @param {Function} keysFunc The function to get the keys of a given object.
     * @returns {Function} Returns the new pairs function.
     */
    function createToPairs(keysFunc) {
      return function(object) {
        var tag = getTag(object);
        if (tag == mapTag) {
          return mapToArray(object);
        }
        if (tag == setTag) {
          return setToPairs(object);
        }
        return baseToPairs(object, keysFunc(object));
      };
    }

    /**
     * Creates a function that either curries or invokes `func` with optional
     * `this` binding and partially applied arguments.
     *
     * @private
     * @param {Function|string} func The function or method name to wrap.
     * @param {number} bitmask The bitmask flags.
     *    1 - `_.bind`
     *    2 - `_.bindKey`
     *    4 - `_.curry` or `_.curryRight` of a bound function
     *    8 - `_.curry`
     *   16 - `_.curryRight`
     *   32 - `_.partial`
     *   64 - `_.partialRight`
     *  128 - `_.rearg`
     *  256 - `_.ary`
     *  512 - `_.flip`
     * @param {*} [thisArg] The `this` binding of `func`.
     * @param {Array} [partials] The arguments to be partially applied.
     * @param {Array} [holders] The `partials` placeholder indexes.
     * @param {Array} [argPos] The argument positions of the new function.
     * @param {number} [ary] The arity cap of `func`.
     * @param {number} [arity] The arity of `func`.
     * @returns {Function} Returns the new wrapped function.
     */
    function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
      var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
      if (!isBindKey && typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var length = partials ? partials.length : 0;
      if (!length) {
        bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
        partials = holders = undefined;
      }
      ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
      arity = arity === undefined ? arity : toInteger(arity);
      length -= holders ? holders.length : 0;

      if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
        var partialsRight = partials,
            holdersRight = holders;

        partials = holders = undefined;
      }
      var data = isBindKey ? undefined : getData(func);

      var newData = [
        func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
        argPos, ary, arity
      ];

      if (data) {
        mergeData(newData, data);
      }
      func = newData[0];
      bitmask = newData[1];
      thisArg = newData[2];
      partials = newData[3];
      holders = newData[4];
      arity = newData[9] = newData[9] === undefined
        ? (isBindKey ? 0 : func.length)
        : nativeMax(newData[9] - length, 0);

      if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
        bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
      }
      if (!bitmask || bitmask == WRAP_BIND_FLAG) {
        var result = createBind(func, bitmask, thisArg);
      } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
        result = createCurry(func, bitmask, arity);
      } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
        result = createPartial(func, bitmask, thisArg, partials);
      } else {
        result = createHybrid.apply(undefined, newData);
      }
      var setter = data ? baseSetData : setData;
      return setWrapToString(setter(result, newData), func, bitmask);
    }

    /**
     * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
     * of source objects to the destination object for all destination properties
     * that resolve to `undefined`.
     *
     * @private
     * @param {*} objValue The destination value.
     * @param {*} srcValue The source value.
     * @param {string} key The key of the property to assign.
     * @param {Object} object The parent object of `objValue`.
     * @returns {*} Returns the value to assign.
     */
    function customDefaultsAssignIn(objValue, srcValue, key, object) {
      if (objValue === undefined ||
          (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
        return srcValue;
      }
      return objValue;
    }

    /**
     * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
     * objects into destination objects that are passed thru.
     *
     * @private
     * @param {*} objValue The destination value.
     * @param {*} srcValue The source value.
     * @param {string} key The key of the property to merge.
     * @param {Object} object The parent object of `objValue`.
     * @param {Object} source The parent object of `srcValue`.
     * @param {Object} [stack] Tracks traversed source values and their merged
     *  counterparts.
     * @returns {*} Returns the value to assign.
     */
    function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
      if (isObject(objValue) && isObject(srcValue)) {
        // Recursively merge objects and arrays (susceptible to call stack limits).
        stack.set(srcValue, objValue);
        baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
        stack['delete'](srcValue);
      }
      return objValue;
    }

    /**
     * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
     * objects.
     *
     * @private
     * @param {*} value The value to inspect.
     * @param {string} key The key of the property to inspect.
     * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
     */
    function customOmitClone(value) {
      return isPlainObject(value) ? undefined : value;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for arrays with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Array} array The array to compare.
     * @param {Array} other The other array to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `array` and `other` objects.
     * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
     */
    function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
      var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
          arrLength = array.length,
          othLength = other.length;

      if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
        return false;
      }
      // Check that cyclic values are equal.
      var arrStacked = stack.get(array);
      var othStacked = stack.get(other);
      if (arrStacked && othStacked) {
        return arrStacked == other && othStacked == array;
      }
      var index = -1,
          result = true,
          seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;

      stack.set(array, other);
      stack.set(other, array);

      // Ignore non-index properties.
      while (++index < arrLength) {
        var arrValue = array[index],
            othValue = other[index];

        if (customizer) {
          var compared = isPartial
            ? customizer(othValue, arrValue, index, other, array, stack)
            : customizer(arrValue, othValue, index, array, other, stack);
        }
        if (compared !== undefined) {
          if (compared) {
            continue;
          }
          result = false;
          break;
        }
        // Recursively compare arrays (susceptible to call stack limits).
        if (seen) {
          if (!arraySome(other, function(othValue, othIndex) {
                if (!cacheHas(seen, othIndex) &&
                    (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
                  return seen.push(othIndex);
                }
              })) {
            result = false;
            break;
          }
        } else if (!(
              arrValue === othValue ||
                equalFunc(arrValue, othValue, bitmask, customizer, stack)
            )) {
          result = false;
          break;
        }
      }
      stack['delete'](array);
      stack['delete'](other);
      return result;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for comparing objects of
     * the same `toStringTag`.
     *
     * **Note:** This function only supports comparing values with tags of
     * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {string} tag The `toStringTag` of the objects to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
      switch (tag) {
        case dataViewTag:
          if ((object.byteLength != other.byteLength) ||
              (object.byteOffset != other.byteOffset)) {
            return false;
          }
          object = object.buffer;
          other = other.buffer;

        case arrayBufferTag:
          if ((object.byteLength != other.byteLength) ||
              !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
            return false;
          }
          return true;

        case boolTag:
        case dateTag:
        case numberTag:
          // Coerce booleans to `1` or `0` and dates to milliseconds.
          // Invalid dates are coerced to `NaN`.
          return eq(+object, +other);

        case errorTag:
          return object.name == other.name && object.message == other.message;

        case regexpTag:
        case stringTag:
          // Coerce regexes to strings and treat strings, primitives and objects,
          // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
          // for more details.
          return object == (other + '');

        case mapTag:
          var convert = mapToArray;

        case setTag:
          var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
          convert || (convert = setToArray);

          if (object.size != other.size && !isPartial) {
            return false;
          }
          // Assume cyclic values are equal.
          var stacked = stack.get(object);
          if (stacked) {
            return stacked == other;
          }
          bitmask |= COMPARE_UNORDERED_FLAG;

          // Recursively compare objects (susceptible to call stack limits).
          stack.set(object, other);
          var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
          stack['delete'](object);
          return result;

        case symbolTag:
          if (symbolValueOf) {
            return symbolValueOf.call(object) == symbolValueOf.call(other);
          }
      }
      return false;
    }

    /**
     * A specialized version of `baseIsEqualDeep` for objects with support for
     * partial deep comparisons.
     *
     * @private
     * @param {Object} object The object to compare.
     * @param {Object} other The other object to compare.
     * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
     * @param {Function} customizer The function to customize comparisons.
     * @param {Function} equalFunc The function to determine equivalents of values.
     * @param {Object} stack Tracks traversed `object` and `other` objects.
     * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
     */
    function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
      var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
          objProps = getAllKeys(object),
          objLength = objProps.length,
          othProps = getAllKeys(other),
          othLength = othProps.length;

      if (objLength != othLength && !isPartial) {
        return false;
      }
      var index = objLength;
      while (index--) {
        var key = objProps[index];
        if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
          return false;
        }
      }
      // Check that cyclic values are equal.
      var objStacked = stack.get(object);
      var othStacked = stack.get(other);
      if (objStacked && othStacked) {
        return objStacked == other && othStacked == object;
      }
      var result = true;
      stack.set(object, other);
      stack.set(other, object);

      var skipCtor = isPartial;
      while (++index < objLength) {
        key = objProps[index];
        var objValue = object[key],
            othValue = other[key];

        if (customizer) {
          var compared = isPartial
            ? customizer(othValue, objValue, key, other, object, stack)
            : customizer(objValue, othValue, key, object, other, stack);
        }
        // Recursively compare objects (susceptible to call stack limits).
        if (!(compared === undefined
              ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
              : compared
            )) {
          result = false;
          break;
        }
        skipCtor || (skipCtor = key == 'constructor');
      }
      if (result && !skipCtor) {
        var objCtor = object.constructor,
            othCtor = other.constructor;

        // Non `Object` object instances with different constructors are not equal.
        if (objCtor != othCtor &&
            ('constructor' in object && 'constructor' in other) &&
            !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
              typeof othCtor == 'function' && othCtor instanceof othCtor)) {
          result = false;
        }
      }
      stack['delete'](object);
      stack['delete'](other);
      return result;
    }

    /**
     * A specialized version of `baseRest` which flattens the rest array.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @returns {Function} Returns the new function.
     */
    function flatRest(func) {
      return setToString(overRest(func, undefined, flatten), func + '');
    }

    /**
     * Creates an array of own enumerable property names and symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function getAllKeys(object) {
      return baseGetAllKeys(object, keys, getSymbols);
    }

    /**
     * Creates an array of own and inherited enumerable property names and
     * symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names and symbols.
     */
    function getAllKeysIn(object) {
      return baseGetAllKeys(object, keysIn, getSymbolsIn);
    }

    /**
     * Gets metadata for `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {*} Returns the metadata for `func`.
     */
    var getData = !metaMap ? noop : function(func) {
      return metaMap.get(func);
    };

    /**
     * Gets the name of `func`.
     *
     * @private
     * @param {Function} func The function to query.
     * @returns {string} Returns the function name.
     */
    function getFuncName(func) {
      var result = (func.name + ''),
          array = realNames[result],
          length = hasOwnProperty.call(realNames, result) ? array.length : 0;

      while (length--) {
        var data = array[length],
            otherFunc = data.func;
        if (otherFunc == null || otherFunc == func) {
          return data.name;
        }
      }
      return result;
    }

    /**
     * Gets the argument placeholder value for `func`.
     *
     * @private
     * @param {Function} func The function to inspect.
     * @returns {*} Returns the placeholder value.
     */
    function getHolder(func) {
      var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
      return object.placeholder;
    }

    /**
     * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
     * this function returns the custom method, otherwise it returns `baseIteratee`.
     * If arguments are provided, the chosen function is invoked with them and
     * its result is returned.
     *
     * @private
     * @param {*} [value] The value to convert to an iteratee.
     * @param {number} [arity] The arity of the created iteratee.
     * @returns {Function} Returns the chosen function or its result.
     */
    function getIteratee() {
      var result = lodash.iteratee || iteratee;
      result = result === iteratee ? baseIteratee : result;
      return arguments.length ? result(arguments[0], arguments[1]) : result;
    }

    /**
     * Gets the data for `map`.
     *
     * @private
     * @param {Object} map The map to query.
     * @param {string} key The reference key.
     * @returns {*} Returns the map data.
     */
    function getMapData(map, key) {
      var data = map.__data__;
      return isKeyable(key)
        ? data[typeof key == 'string' ? 'string' : 'hash']
        : data.map;
    }

    /**
     * Gets the property names, values, and compare flags of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the match data of `object`.
     */
    function getMatchData(object) {
      var result = keys(object),
          length = result.length;

      while (length--) {
        var key = result[length],
            value = object[key];

        result[length] = [key, value, isStrictComparable(value)];
      }
      return result;
    }

    /**
     * Gets the native function at `key` of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {string} key The key of the method to get.
     * @returns {*} Returns the function if it's native, else `undefined`.
     */
    function getNative(object, key) {
      var value = getValue(object, key);
      return baseIsNative(value) ? value : undefined;
    }

    /**
     * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the raw `toStringTag`.
     */
    function getRawTag(value) {
      var isOwn = hasOwnProperty.call(value, symToStringTag),
          tag = value[symToStringTag];

      try {
        value[symToStringTag] = undefined;
        var unmasked = true;
      } catch (e) {}

      var result = nativeObjectToString.call(value);
      if (unmasked) {
        if (isOwn) {
          value[symToStringTag] = tag;
        } else {
          delete value[symToStringTag];
        }
      }
      return result;
    }

    /**
     * Creates an array of the own enumerable symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of symbols.
     */
    var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
      if (object == null) {
        return [];
      }
      object = Object(object);
      return arrayFilter(nativeGetSymbols(object), function(symbol) {
        return propertyIsEnumerable.call(object, symbol);
      });
    };

    /**
     * Creates an array of the own and inherited enumerable symbols of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of symbols.
     */
    var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
      var result = [];
      while (object) {
        arrayPush(result, getSymbols(object));
        object = getPrototype(object);
      }
      return result;
    };

    /**
     * Gets the `toStringTag` of `value`.
     *
     * @private
     * @param {*} value The value to query.
     * @returns {string} Returns the `toStringTag`.
     */
    var getTag = baseGetTag;

    // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
    if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
        (Map && getTag(new Map) != mapTag) ||
        (Promise && getTag(Promise.resolve()) != promiseTag) ||
        (Set && getTag(new Set) != setTag) ||
        (WeakMap && getTag(new WeakMap) != weakMapTag)) {
      getTag = function(value) {
        var result = baseGetTag(value),
            Ctor = result == objectTag ? value.constructor : undefined,
            ctorString = Ctor ? toSource(Ctor) : '';

        if (ctorString) {
          switch (ctorString) {
            case dataViewCtorString: return dataViewTag;
            case mapCtorString: return mapTag;
            case promiseCtorString: return promiseTag;
            case setCtorString: return setTag;
            case weakMapCtorString: return weakMapTag;
          }
        }
        return result;
      };
    }

    /**
     * Gets the view, applying any `transforms` to the `start` and `end` positions.
     *
     * @private
     * @param {number} start The start of the view.
     * @param {number} end The end of the view.
     * @param {Array} transforms The transformations to apply to the view.
     * @returns {Object} Returns an object containing the `start` and `end`
     *  positions of the view.
     */
    function getView(start, end, transforms) {
      var index = -1,
          length = transforms.length;

      while (++index < length) {
        var data = transforms[index],
            size = data.size;

        switch (data.type) {
          case 'drop':      start += size; break;
          case 'dropRight': end -= size; break;
          case 'take':      end = nativeMin(end, start + size); break;
          case 'takeRight': start = nativeMax(start, end - size); break;
        }
      }
      return { 'start': start, 'end': end };
    }

    /**
     * Extracts wrapper details from the `source` body comment.
     *
     * @private
     * @param {string} source The source to inspect.
     * @returns {Array} Returns the wrapper details.
     */
    function getWrapDetails(source) {
      var match = source.match(reWrapDetails);
      return match ? match[1].split(reSplitDetails) : [];
    }

    /**
     * Checks if `path` exists on `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @param {Function} hasFunc The function to check properties.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     */
    function hasPath(object, path, hasFunc) {
      path = castPath(path, object);

      var index = -1,
          length = path.length,
          result = false;

      while (++index < length) {
        var key = toKey(path[index]);
        if (!(result = object != null && hasFunc(object, key))) {
          break;
        }
        object = object[key];
      }
      if (result || ++index != length) {
        return result;
      }
      length = object == null ? 0 : object.length;
      return !!length && isLength(length) && isIndex(key, length) &&
        (isArray(object) || isArguments(object));
    }

    /**
     * Initializes an array clone.
     *
     * @private
     * @param {Array} array The array to clone.
     * @returns {Array} Returns the initialized clone.
     */
    function initCloneArray(array) {
      var length = array.length,
          result = new array.constructor(length);

      // Add properties assigned by `RegExp#exec`.
      if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
        result.index = array.index;
        result.input = array.input;
      }
      return result;
    }

    /**
     * Initializes an object clone.
     *
     * @private
     * @param {Object} object The object to clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneObject(object) {
      return (typeof object.constructor == 'function' && !isPrototype(object))
        ? baseCreate(getPrototype(object))
        : {};
    }

    /**
     * Initializes an object clone based on its `toStringTag`.
     *
     * **Note:** This function only supports cloning values with tags of
     * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
     *
     * @private
     * @param {Object} object The object to clone.
     * @param {string} tag The `toStringTag` of the object to clone.
     * @param {boolean} [isDeep] Specify a deep clone.
     * @returns {Object} Returns the initialized clone.
     */
    function initCloneByTag(object, tag, isDeep) {
      var Ctor = object.constructor;
      switch (tag) {
        case arrayBufferTag:
          return cloneArrayBuffer(object);

        case boolTag:
        case dateTag:
          return new Ctor(+object);

        case dataViewTag:
          return cloneDataView(object, isDeep);

        case float32Tag: case float64Tag:
        case int8Tag: case int16Tag: case int32Tag:
        case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
          return cloneTypedArray(object, isDeep);

        case mapTag:
          return new Ctor;

        case numberTag:
        case stringTag:
          return new Ctor(object);

        case regexpTag:
          return cloneRegExp(object);

        case setTag:
          return new Ctor;

        case symbolTag:
          return cloneSymbol(object);
      }
    }

    /**
     * Inserts wrapper `details` in a comment at the top of the `source` body.
     *
     * @private
     * @param {string} source The source to modify.
     * @returns {Array} details The details to insert.
     * @returns {string} Returns the modified source.
     */
    function insertWrapDetails(source, details) {
      var length = details.length;
      if (!length) {
        return source;
      }
      var lastIndex = length - 1;
      details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
      details = details.join(length > 2 ? ', ' : ' ');
      return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
    }

    /**
     * Checks if `value` is a flattenable `arguments` object or array.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
     */
    function isFlattenable(value) {
      return isArray(value) || isArguments(value) ||
        !!(spreadableSymbol && value && value[spreadableSymbol]);
    }

    /**
     * Checks if `value` is a valid array-like index.
     *
     * @private
     * @param {*} value The value to check.
     * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
     * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
     */
    function isIndex(value, length) {
      var type = typeof value;
      length = length == null ? MAX_SAFE_INTEGER : length;

      return !!length &&
        (type == 'number' ||
          (type != 'symbol' && reIsUint.test(value))) &&
            (value > -1 && value % 1 == 0 && value < length);
    }

    /**
     * Checks if the given arguments are from an iteratee call.
     *
     * @private
     * @param {*} value The potential iteratee value argument.
     * @param {*} index The potential iteratee index or key argument.
     * @param {*} object The potential iteratee object argument.
     * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
     *  else `false`.
     */
    function isIterateeCall(value, index, object) {
      if (!isObject(object)) {
        return false;
      }
      var type = typeof index;
      if (type == 'number'
            ? (isArrayLike(object) && isIndex(index, object.length))
            : (type == 'string' && index in object)
          ) {
        return eq(object[index], value);
      }
      return false;
    }

    /**
     * Checks if `value` is a property name and not a property path.
     *
     * @private
     * @param {*} value The value to check.
     * @param {Object} [object] The object to query keys on.
     * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
     */
    function isKey(value, object) {
      if (isArray(value)) {
        return false;
      }
      var type = typeof value;
      if (type == 'number' || type == 'symbol' || type == 'boolean' ||
          value == null || isSymbol(value)) {
        return true;
      }
      return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
        (object != null && value in Object(object));
    }

    /**
     * Checks if `value` is suitable for use as unique object key.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
     */
    function isKeyable(value) {
      var type = typeof value;
      return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
        ? (value !== '__proto__')
        : (value === null);
    }

    /**
     * Checks if `func` has a lazy counterpart.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
     *  else `false`.
     */
    function isLaziable(func) {
      var funcName = getFuncName(func),
          other = lodash[funcName];

      if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
        return false;
      }
      if (func === other) {
        return true;
      }
      var data = getData(other);
      return !!data && func === data[0];
    }

    /**
     * Checks if `func` has its source masked.
     *
     * @private
     * @param {Function} func The function to check.
     * @returns {boolean} Returns `true` if `func` is masked, else `false`.
     */
    function isMasked(func) {
      return !!maskSrcKey && (maskSrcKey in func);
    }

    /**
     * Checks if `func` is capable of being masked.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
     */
    var isMaskable = coreJsData ? isFunction : stubFalse;

    /**
     * Checks if `value` is likely a prototype object.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
     */
    function isPrototype(value) {
      var Ctor = value && value.constructor,
          proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;

      return value === proto;
    }

    /**
     * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
     *
     * @private
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` if suitable for strict
     *  equality comparisons, else `false`.
     */
    function isStrictComparable(value) {
      return value === value && !isObject(value);
    }

    /**
     * A specialized version of `matchesProperty` for source values suitable
     * for strict equality comparisons, i.e. `===`.
     *
     * @private
     * @param {string} key The key of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     */
    function matchesStrictComparable(key, srcValue) {
      return function(object) {
        if (object == null) {
          return false;
        }
        return object[key] === srcValue &&
          (srcValue !== undefined || (key in Object(object)));
      };
    }

    /**
     * A specialized version of `_.memoize` which clears the memoized function's
     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
     *
     * @private
     * @param {Function} func The function to have its output memoized.
     * @returns {Function} Returns the new memoized function.
     */
    function memoizeCapped(func) {
      var result = memoize(func, function(key) {
        if (cache.size === MAX_MEMOIZE_SIZE) {
          cache.clear();
        }
        return key;
      });

      var cache = result.cache;
      return result;
    }

    /**
     * Merges the function metadata of `source` into `data`.
     *
     * Merging metadata reduces the number of wrappers used to invoke a function.
     * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
     * may be applied regardless of execution order. Methods like `_.ary` and
     * `_.rearg` modify function arguments, making the order in which they are
     * executed important, preventing the merging of metadata. However, we make
     * an exception for a safe combined case where curried functions have `_.ary`
     * and or `_.rearg` applied.
     *
     * @private
     * @param {Array} data The destination metadata.
     * @param {Array} source The source metadata.
     * @returns {Array} Returns `data`.
     */
    function mergeData(data, source) {
      var bitmask = data[1],
          srcBitmask = source[1],
          newBitmask = bitmask | srcBitmask,
          isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);

      var isCombo =
        ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
        ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
        ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));

      // Exit early if metadata can't be merged.
      if (!(isCommon || isCombo)) {
        return data;
      }
      // Use source `thisArg` if available.
      if (srcBitmask & WRAP_BIND_FLAG) {
        data[2] = source[2];
        // Set when currying a bound function.
        newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
      }
      // Compose partial arguments.
      var value = source[3];
      if (value) {
        var partials = data[3];
        data[3] = partials ? composeArgs(partials, value, source[4]) : value;
        data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
      }
      // Compose partial right arguments.
      value = source[5];
      if (value) {
        partials = data[5];
        data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
        data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
      }
      // Use source `argPos` if available.
      value = source[7];
      if (value) {
        data[7] = value;
      }
      // Use source `ary` if it's smaller.
      if (srcBitmask & WRAP_ARY_FLAG) {
        data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
      }
      // Use source `arity` if one is not provided.
      if (data[9] == null) {
        data[9] = source[9];
      }
      // Use source `func` and merge bitmasks.
      data[0] = source[0];
      data[1] = newBitmask;

      return data;
    }

    /**
     * This function is like
     * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
     * except that it includes inherited enumerable properties.
     *
     * @private
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     */
    function nativeKeysIn(object) {
      var result = [];
      if (object != null) {
        for (var key in Object(object)) {
          result.push(key);
        }
      }
      return result;
    }

    /**
     * Converts `value` to a string using `Object.prototype.toString`.
     *
     * @private
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     */
    function objectToString(value) {
      return nativeObjectToString.call(value);
    }

    /**
     * A specialized version of `baseRest` which transforms the rest array.
     *
     * @private
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @param {Function} transform The rest array transform.
     * @returns {Function} Returns the new function.
     */
    function overRest(func, start, transform) {
      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
      return function() {
        var args = arguments,
            index = -1,
            length = nativeMax(args.length - start, 0),
            array = Array(length);

        while (++index < length) {
          array[index] = args[start + index];
        }
        index = -1;
        var otherArgs = Array(start + 1);
        while (++index < start) {
          otherArgs[index] = args[index];
        }
        otherArgs[start] = transform(array);
        return apply(func, this, otherArgs);
      };
    }

    /**
     * Gets the parent value at `path` of `object`.
     *
     * @private
     * @param {Object} object The object to query.
     * @param {Array} path The path to get the parent value of.
     * @returns {*} Returns the parent value.
     */
    function parent(object, path) {
      return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
    }

    /**
     * Reorder `array` according to the specified indexes where the element at
     * the first index is assigned as the first element, the element at
     * the second index is assigned as the second element, and so on.
     *
     * @private
     * @param {Array} array The array to reorder.
     * @param {Array} indexes The arranged array indexes.
     * @returns {Array} Returns `array`.
     */
    function reorder(array, indexes) {
      var arrLength = array.length,
          length = nativeMin(indexes.length, arrLength),
          oldArray = copyArray(array);

      while (length--) {
        var index = indexes[length];
        array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
      }
      return array;
    }

    /**
     * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
     *
     * @private
     * @param {Object} object The object to query.
     * @param {string} key The key of the property to get.
     * @returns {*} Returns the property value.
     */
    function safeGet(object, key) {
      if (key === 'constructor' && typeof object[key] === 'function') {
        return;
      }

      if (key == '__proto__') {
        return;
      }

      return object[key];
    }

    /**
     * Sets metadata for `func`.
     *
     * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
     * period of time, it will trip its breaker and transition to an identity
     * function to avoid garbage collection pauses in V8. See
     * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
     * for more details.
     *
     * @private
     * @param {Function} func The function to associate metadata with.
     * @param {*} data The metadata.
     * @returns {Function} Returns `func`.
     */
    var setData = shortOut(baseSetData);

    /**
     * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
     *
     * @private
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @returns {number|Object} Returns the timer id or timeout object.
     */
    var setTimeout = ctxSetTimeout || function(func, wait) {
      return root.setTimeout(func, wait);
    };

    /**
     * Sets the `toString` method of `func` to return `string`.
     *
     * @private
     * @param {Function} func The function to modify.
     * @param {Function} string The `toString` result.
     * @returns {Function} Returns `func`.
     */
    var setToString = shortOut(baseSetToString);

    /**
     * Sets the `toString` method of `wrapper` to mimic the source of `reference`
     * with wrapper details in a comment at the top of the source body.
     *
     * @private
     * @param {Function} wrapper The function to modify.
     * @param {Function} reference The reference function.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @returns {Function} Returns `wrapper`.
     */
    function setWrapToString(wrapper, reference, bitmask) {
      var source = (reference + '');
      return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
    }

    /**
     * Creates a function that'll short out and invoke `identity` instead
     * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
     * milliseconds.
     *
     * @private
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new shortable function.
     */
    function shortOut(func) {
      var count = 0,
          lastCalled = 0;

      return function() {
        var stamp = nativeNow(),
            remaining = HOT_SPAN - (stamp - lastCalled);

        lastCalled = stamp;
        if (remaining > 0) {
          if (++count >= HOT_COUNT) {
            return arguments[0];
          }
        } else {
          count = 0;
        }
        return func.apply(undefined, arguments);
      };
    }

    /**
     * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
     *
     * @private
     * @param {Array} array The array to shuffle.
     * @param {number} [size=array.length] The size of `array`.
     * @returns {Array} Returns `array`.
     */
    function shuffleSelf(array, size) {
      var index = -1,
          length = array.length,
          lastIndex = length - 1;

      size = size === undefined ? length : size;
      while (++index < size) {
        var rand = baseRandom(index, lastIndex),
            value = array[rand];

        array[rand] = array[index];
        array[index] = value;
      }
      array.length = size;
      return array;
    }

    /**
     * Converts `string` to a property path array.
     *
     * @private
     * @param {string} string The string to convert.
     * @returns {Array} Returns the property path array.
     */
    var stringToPath = memoizeCapped(function(string) {
      var result = [];
      if (string.charCodeAt(0) === 46 /* . */) {
        result.push('');
      }
      string.replace(rePropName, function(match, number, quote, subString) {
        result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
      });
      return result;
    });

    /**
     * Converts `value` to a string key if it's not a string or symbol.
     *
     * @private
     * @param {*} value The value to inspect.
     * @returns {string|symbol} Returns the key.
     */
    function toKey(value) {
      if (typeof value == 'string' || isSymbol(value)) {
        return value;
      }
      var result = (value + '');
      return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
    }

    /**
     * Converts `func` to its source code.
     *
     * @private
     * @param {Function} func The function to convert.
     * @returns {string} Returns the source code.
     */
    function toSource(func) {
      if (func != null) {
        try {
          return funcToString.call(func);
        } catch (e) {}
        try {
          return (func + '');
        } catch (e) {}
      }
      return '';
    }

    /**
     * Updates wrapper `details` based on `bitmask` flags.
     *
     * @private
     * @returns {Array} details The details to modify.
     * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
     * @returns {Array} Returns `details`.
     */
    function updateWrapDetails(details, bitmask) {
      arrayEach(wrapFlags, function(pair) {
        var value = '_.' + pair[0];
        if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
          details.push(value);
        }
      });
      return details.sort();
    }

    /**
     * Creates a clone of `wrapper`.
     *
     * @private
     * @param {Object} wrapper The wrapper to clone.
     * @returns {Object} Returns the cloned wrapper.
     */
    function wrapperClone(wrapper) {
      if (wrapper instanceof LazyWrapper) {
        return wrapper.clone();
      }
      var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
      result.__actions__ = copyArray(wrapper.__actions__);
      result.__index__  = wrapper.__index__;
      result.__values__ = wrapper.__values__;
      return result;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an array of elements split into groups the length of `size`.
     * If `array` can't be split evenly, the final chunk will be the remaining
     * elements.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to process.
     * @param {number} [size=1] The length of each chunk
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the new array of chunks.
     * @example
     *
     * _.chunk(['a', 'b', 'c', 'd'], 2);
     * // => [['a', 'b'], ['c', 'd']]
     *
     * _.chunk(['a', 'b', 'c', 'd'], 3);
     * // => [['a', 'b', 'c'], ['d']]
     */
    function chunk(array, size, guard) {
      if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
        size = 1;
      } else {
        size = nativeMax(toInteger(size), 0);
      }
      var length = array == null ? 0 : array.length;
      if (!length || size < 1) {
        return [];
      }
      var index = 0,
          resIndex = 0,
          result = Array(nativeCeil(length / size));

      while (index < length) {
        result[resIndex++] = baseSlice(array, index, (index += size));
      }
      return result;
    }

    /**
     * Creates an array with all falsey values removed. The values `false`, `null`,
     * `0`, `""`, `undefined`, and `NaN` are falsey.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to compact.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.compact([0, 1, false, 2, '', 3]);
     * // => [1, 2, 3]
     */
    function compact(array) {
      var index = -1,
          length = array == null ? 0 : array.length,
          resIndex = 0,
          result = [];

      while (++index < length) {
        var value = array[index];
        if (value) {
          result[resIndex++] = value;
        }
      }
      return result;
    }

    /**
     * Creates a new array concatenating `array` with any additional arrays
     * and/or values.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to concatenate.
     * @param {...*} [values] The values to concatenate.
     * @returns {Array} Returns the new concatenated array.
     * @example
     *
     * var array = [1];
     * var other = _.concat(array, 2, [3], [[4]]);
     *
     * console.log(other);
     * // => [1, 2, 3, [4]]
     *
     * console.log(array);
     * // => [1]
     */
    function concat() {
      var length = arguments.length;
      if (!length) {
        return [];
      }
      var args = Array(length - 1),
          array = arguments[0],
          index = length;

      while (index--) {
        args[index - 1] = arguments[index];
      }
      return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
    }

    /**
     * Creates an array of `array` values not included in the other given arrays
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. The order and references of result values are
     * determined by the first array.
     *
     * **Note:** Unlike `_.pullAll`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.without, _.xor
     * @example
     *
     * _.difference([2, 1], [2, 3]);
     * // => [1]
     */
    var difference = baseRest(function(array, values) {
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
        : [];
    });

    /**
     * This method is like `_.difference` except that it accepts `iteratee` which
     * is invoked for each element of `array` and `values` to generate the criterion
     * by which they're compared. The order and references of result values are
     * determined by the first array. The iteratee is invoked with one argument:
     * (value).
     *
     * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // => [1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
     * // => [{ 'x': 2 }]
     */
    var differenceBy = baseRest(function(array, values) {
      var iteratee = last(values);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
        : [];
    });

    /**
     * This method is like `_.difference` except that it accepts `comparator`
     * which is invoked to compare elements of `array` to `values`. The order and
     * references of result values are determined by the first array. The comparator
     * is invoked with two arguments: (arrVal, othVal).
     *
     * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...Array} [values] The values to exclude.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
     *
     * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
     * // => [{ 'x': 2, 'y': 1 }]
     */
    var differenceWith = baseRest(function(array, values) {
      var comparator = last(values);
      if (isArrayLikeObject(comparator)) {
        comparator = undefined;
      }
      return isArrayLikeObject(array)
        ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
        : [];
    });

    /**
     * Creates a slice of `array` with `n` elements dropped from the beginning.
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.drop([1, 2, 3]);
     * // => [2, 3]
     *
     * _.drop([1, 2, 3], 2);
     * // => [3]
     *
     * _.drop([1, 2, 3], 5);
     * // => []
     *
     * _.drop([1, 2, 3], 0);
     * // => [1, 2, 3]
     */
    function drop(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      return baseSlice(array, n < 0 ? 0 : n, length);
    }

    /**
     * Creates a slice of `array` with `n` elements dropped from the end.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to drop.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.dropRight([1, 2, 3]);
     * // => [1, 2]
     *
     * _.dropRight([1, 2, 3], 2);
     * // => [1]
     *
     * _.dropRight([1, 2, 3], 5);
     * // => []
     *
     * _.dropRight([1, 2, 3], 0);
     * // => [1, 2, 3]
     */
    function dropRight(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      n = length - n;
      return baseSlice(array, 0, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the end.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * _.dropRightWhile(users, function(o) { return !o.active; });
     * // => objects for ['barney']
     *
     * // The `_.matches` iteratee shorthand.
     * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
     * // => objects for ['barney', 'fred']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.dropRightWhile(users, ['active', false]);
     * // => objects for ['barney']
     *
     * // The `_.property` iteratee shorthand.
     * _.dropRightWhile(users, 'active');
     * // => objects for ['barney', 'fred', 'pebbles']
     */
    function dropRightWhile(array, predicate) {
      return (array && array.length)
        ? baseWhile(array, getIteratee(predicate, 3), true, true)
        : [];
    }

    /**
     * Creates a slice of `array` excluding elements dropped from the beginning.
     * Elements are dropped until `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * _.dropWhile(users, function(o) { return !o.active; });
     * // => objects for ['pebbles']
     *
     * // The `_.matches` iteratee shorthand.
     * _.dropWhile(users, { 'user': 'barney', 'active': false });
     * // => objects for ['fred', 'pebbles']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.dropWhile(users, ['active', false]);
     * // => objects for ['pebbles']
     *
     * // The `_.property` iteratee shorthand.
     * _.dropWhile(users, 'active');
     * // => objects for ['barney', 'fred', 'pebbles']
     */
    function dropWhile(array, predicate) {
      return (array && array.length)
        ? baseWhile(array, getIteratee(predicate, 3), true)
        : [];
    }

    /**
     * Fills elements of `array` with `value` from `start` up to, but not
     * including, `end`.
     *
     * **Note:** This method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Array
     * @param {Array} array The array to fill.
     * @param {*} value The value to fill `array` with.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _.fill(array, 'a');
     * console.log(array);
     * // => ['a', 'a', 'a']
     *
     * _.fill(Array(3), 2);
     * // => [2, 2, 2]
     *
     * _.fill([4, 6, 8, 10], '*', 1, 3);
     * // => [4, '*', '*', 10]
     */
    function fill(array, value, start, end) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
        start = 0;
        end = length;
      }
      return baseFill(array, value, start, end);
    }

    /**
     * This method is like `_.find` except that it returns the index of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * _.findIndex(users, function(o) { return o.user == 'barney'; });
     * // => 0
     *
     * // The `_.matches` iteratee shorthand.
     * _.findIndex(users, { 'user': 'fred', 'active': false });
     * // => 1
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findIndex(users, ['active', false]);
     * // => 0
     *
     * // The `_.property` iteratee shorthand.
     * _.findIndex(users, 'active');
     * // => 2
     */
    function findIndex(array, predicate, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = fromIndex == null ? 0 : toInteger(fromIndex);
      if (index < 0) {
        index = nativeMax(length + index, 0);
      }
      return baseFindIndex(array, getIteratee(predicate, 3), index);
    }

    /**
     * This method is like `_.findIndex` except that it iterates over elements
     * of `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=array.length-1] The index to search from.
     * @returns {number} Returns the index of the found element, else `-1`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
     * // => 2
     *
     * // The `_.matches` iteratee shorthand.
     * _.findLastIndex(users, { 'user': 'barney', 'active': true });
     * // => 0
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findLastIndex(users, ['active', false]);
     * // => 2
     *
     * // The `_.property` iteratee shorthand.
     * _.findLastIndex(users, 'active');
     * // => 0
     */
    function findLastIndex(array, predicate, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = length - 1;
      if (fromIndex !== undefined) {
        index = toInteger(fromIndex);
        index = fromIndex < 0
          ? nativeMax(length + index, 0)
          : nativeMin(index, length - 1);
      }
      return baseFindIndex(array, getIteratee(predicate, 3), index, true);
    }

    /**
     * Flattens `array` a single level deep.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flatten([1, [2, [3, [4]], 5]]);
     * // => [1, 2, [3, [4]], 5]
     */
    function flatten(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseFlatten(array, 1) : [];
    }

    /**
     * Recursively flattens `array`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * _.flattenDeep([1, [2, [3, [4]], 5]]);
     * // => [1, 2, 3, 4, 5]
     */
    function flattenDeep(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseFlatten(array, INFINITY) : [];
    }

    /**
     * Recursively flatten `array` up to `depth` times.
     *
     * @static
     * @memberOf _
     * @since 4.4.0
     * @category Array
     * @param {Array} array The array to flatten.
     * @param {number} [depth=1] The maximum recursion depth.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * var array = [1, [2, [3, [4]], 5]];
     *
     * _.flattenDepth(array, 1);
     * // => [1, 2, [3, [4]], 5]
     *
     * _.flattenDepth(array, 2);
     * // => [1, 2, 3, [4], 5]
     */
    function flattenDepth(array, depth) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      depth = depth === undefined ? 1 : toInteger(depth);
      return baseFlatten(array, depth);
    }

    /**
     * The inverse of `_.toPairs`; this method returns an object composed
     * from key-value `pairs`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} pairs The key-value pairs.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.fromPairs([['a', 1], ['b', 2]]);
     * // => { 'a': 1, 'b': 2 }
     */
    function fromPairs(pairs) {
      var index = -1,
          length = pairs == null ? 0 : pairs.length,
          result = {};

      while (++index < length) {
        var pair = pairs[index];
        result[pair[0]] = pair[1];
      }
      return result;
    }

    /**
     * Gets the first element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @alias first
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the first element of `array`.
     * @example
     *
     * _.head([1, 2, 3]);
     * // => 1
     *
     * _.head([]);
     * // => undefined
     */
    function head(array) {
      return (array && array.length) ? array[0] : undefined;
    }

    /**
     * Gets the index at which the first occurrence of `value` is found in `array`
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. If `fromIndex` is negative, it's used as the
     * offset from the end of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.indexOf([1, 2, 1, 2], 2);
     * // => 1
     *
     * // Search from the `fromIndex`.
     * _.indexOf([1, 2, 1, 2], 2, 2);
     * // => 3
     */
    function indexOf(array, value, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = fromIndex == null ? 0 : toInteger(fromIndex);
      if (index < 0) {
        index = nativeMax(length + index, 0);
      }
      return baseIndexOf(array, value, index);
    }

    /**
     * Gets all but the last element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.initial([1, 2, 3]);
     * // => [1, 2]
     */
    function initial(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseSlice(array, 0, -1) : [];
    }

    /**
     * Creates an array of unique values that are included in all given arrays
     * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons. The order and references of result values are
     * determined by the first array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * _.intersection([2, 1], [2, 3]);
     * // => [2]
     */
    var intersection = baseRest(function(arrays) {
      var mapped = arrayMap(arrays, castArrayLikeObject);
      return (mapped.length && mapped[0] === arrays[0])
        ? baseIntersection(mapped)
        : [];
    });

    /**
     * This method is like `_.intersection` except that it accepts `iteratee`
     * which is invoked for each element of each `arrays` to generate the criterion
     * by which they're compared. The order and references of result values are
     * determined by the first array. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // => [2.1]
     *
     * // The `_.property` iteratee shorthand.
     * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
     * // => [{ 'x': 1 }]
     */
    var intersectionBy = baseRest(function(arrays) {
      var iteratee = last(arrays),
          mapped = arrayMap(arrays, castArrayLikeObject);

      if (iteratee === last(mapped)) {
        iteratee = undefined;
      } else {
        mapped.pop();
      }
      return (mapped.length && mapped[0] === arrays[0])
        ? baseIntersection(mapped, getIteratee(iteratee, 2))
        : [];
    });

    /**
     * This method is like `_.intersection` except that it accepts `comparator`
     * which is invoked to compare elements of `arrays`. The order and references
     * of result values are determined by the first array. The comparator is
     * invoked with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of intersecting values.
     * @example
     *
     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
     *
     * _.intersectionWith(objects, others, _.isEqual);
     * // => [{ 'x': 1, 'y': 2 }]
     */
    var intersectionWith = baseRest(function(arrays) {
      var comparator = last(arrays),
          mapped = arrayMap(arrays, castArrayLikeObject);

      comparator = typeof comparator == 'function' ? comparator : undefined;
      if (comparator) {
        mapped.pop();
      }
      return (mapped.length && mapped[0] === arrays[0])
        ? baseIntersection(mapped, undefined, comparator)
        : [];
    });

    /**
     * Converts all elements in `array` into a string separated by `separator`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to convert.
     * @param {string} [separator=','] The element separator.
     * @returns {string} Returns the joined string.
     * @example
     *
     * _.join(['a', 'b', 'c'], '~');
     * // => 'a~b~c'
     */
    function join(array, separator) {
      return array == null ? '' : nativeJoin.call(array, separator);
    }

    /**
     * Gets the last element of `array`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {*} Returns the last element of `array`.
     * @example
     *
     * _.last([1, 2, 3]);
     * // => 3
     */
    function last(array) {
      var length = array == null ? 0 : array.length;
      return length ? array[length - 1] : undefined;
    }

    /**
     * This method is like `_.indexOf` except that it iterates over elements of
     * `array` from right to left.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=array.length-1] The index to search from.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.lastIndexOf([1, 2, 1, 2], 2);
     * // => 3
     *
     * // Search from the `fromIndex`.
     * _.lastIndexOf([1, 2, 1, 2], 2, 2);
     * // => 1
     */
    function lastIndexOf(array, value, fromIndex) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return -1;
      }
      var index = length;
      if (fromIndex !== undefined) {
        index = toInteger(fromIndex);
        index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
      }
      return value === value
        ? strictLastIndexOf(array, value, index)
        : baseFindIndex(array, baseIsNaN, index, true);
    }

    /**
     * Gets the element at index `n` of `array`. If `n` is negative, the nth
     * element from the end is returned.
     *
     * @static
     * @memberOf _
     * @since 4.11.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=0] The index of the element to return.
     * @returns {*} Returns the nth element of `array`.
     * @example
     *
     * var array = ['a', 'b', 'c', 'd'];
     *
     * _.nth(array, 1);
     * // => 'b'
     *
     * _.nth(array, -2);
     * // => 'c';
     */
    function nth(array, n) {
      return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
    }

    /**
     * Removes all given values from `array` using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
     * to remove elements from an array by predicate.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...*} [values] The values to remove.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
     *
     * _.pull(array, 'a', 'c');
     * console.log(array);
     * // => ['b', 'b']
     */
    var pull = baseRest(pullAll);

    /**
     * This method is like `_.pull` except that it accepts an array of values to remove.
     *
     * **Note:** Unlike `_.difference`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
     *
     * _.pullAll(array, ['a', 'c']);
     * console.log(array);
     * // => ['b', 'b']
     */
    function pullAll(array, values) {
      return (array && array.length && values && values.length)
        ? basePullAll(array, values)
        : array;
    }

    /**
     * This method is like `_.pullAll` except that it accepts `iteratee` which is
     * invoked for each element of `array` and `values` to generate the criterion
     * by which they're compared. The iteratee is invoked with one argument: (value).
     *
     * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
     *
     * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
     * console.log(array);
     * // => [{ 'x': 2 }]
     */
    function pullAllBy(array, values, iteratee) {
      return (array && array.length && values && values.length)
        ? basePullAll(array, values, getIteratee(iteratee, 2))
        : array;
    }

    /**
     * This method is like `_.pullAll` except that it accepts `comparator` which
     * is invoked to compare elements of `array` to `values`. The comparator is
     * invoked with two arguments: (arrVal, othVal).
     *
     * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Array} values The values to remove.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
     *
     * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
     * console.log(array);
     * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
     */
    function pullAllWith(array, values, comparator) {
      return (array && array.length && values && values.length)
        ? basePullAll(array, values, undefined, comparator)
        : array;
    }

    /**
     * Removes elements from `array` corresponding to `indexes` and returns an
     * array of removed elements.
     *
     * **Note:** Unlike `_.at`, this method mutates `array`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {...(number|number[])} [indexes] The indexes of elements to remove.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = ['a', 'b', 'c', 'd'];
     * var pulled = _.pullAt(array, [1, 3]);
     *
     * console.log(array);
     * // => ['a', 'c']
     *
     * console.log(pulled);
     * // => ['b', 'd']
     */
    var pullAt = flatRest(function(array, indexes) {
      var length = array == null ? 0 : array.length,
          result = baseAt(array, indexes);

      basePullAt(array, arrayMap(indexes, function(index) {
        return isIndex(index, length) ? +index : index;
      }).sort(compareAscending));

      return result;
    });

    /**
     * Removes all elements from `array` that `predicate` returns truthy for
     * and returns an array of the removed elements. The predicate is invoked
     * with three arguments: (value, index, array).
     *
     * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
     * to pull elements from an array by value.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new array of removed elements.
     * @example
     *
     * var array = [1, 2, 3, 4];
     * var evens = _.remove(array, function(n) {
     *   return n % 2 == 0;
     * });
     *
     * console.log(array);
     * // => [1, 3]
     *
     * console.log(evens);
     * // => [2, 4]
     */
    function remove(array, predicate) {
      var result = [];
      if (!(array && array.length)) {
        return result;
      }
      var index = -1,
          indexes = [],
          length = array.length;

      predicate = getIteratee(predicate, 3);
      while (++index < length) {
        var value = array[index];
        if (predicate(value, index, array)) {
          result.push(value);
          indexes.push(index);
        }
      }
      basePullAt(array, indexes);
      return result;
    }

    /**
     * Reverses `array` so that the first element becomes the last, the second
     * element becomes the second to last, and so on.
     *
     * **Note:** This method mutates `array` and is based on
     * [`Array#reverse`](https://mdn.io/Array/reverse).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to modify.
     * @returns {Array} Returns `array`.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _.reverse(array);
     * // => [3, 2, 1]
     *
     * console.log(array);
     * // => [3, 2, 1]
     */
    function reverse(array) {
      return array == null ? array : nativeReverse.call(array);
    }

    /**
     * Creates a slice of `array` from `start` up to, but not including, `end`.
     *
     * **Note:** This method is used instead of
     * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
     * returned.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to slice.
     * @param {number} [start=0] The start position.
     * @param {number} [end=array.length] The end position.
     * @returns {Array} Returns the slice of `array`.
     */
    function slice(array, start, end) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
        start = 0;
        end = length;
      }
      else {
        start = start == null ? 0 : toInteger(start);
        end = end === undefined ? length : toInteger(end);
      }
      return baseSlice(array, start, end);
    }

    /**
     * Uses a binary search to determine the lowest index at which `value`
     * should be inserted into `array` in order to maintain its sort order.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedIndex([30, 50], 40);
     * // => 1
     */
    function sortedIndex(array, value) {
      return baseSortedIndex(array, value);
    }

    /**
     * This method is like `_.sortedIndex` except that it accepts `iteratee`
     * which is invoked for `value` and each element of `array` to compute their
     * sort ranking. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * var objects = [{ 'x': 4 }, { 'x': 5 }];
     *
     * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
     * // => 0
     *
     * // The `_.property` iteratee shorthand.
     * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
     * // => 0
     */
    function sortedIndexBy(array, value, iteratee) {
      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
    }

    /**
     * This method is like `_.indexOf` except that it performs a binary
     * search on a sorted `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
     * // => 1
     */
    function sortedIndexOf(array, value) {
      var length = array == null ? 0 : array.length;
      if (length) {
        var index = baseSortedIndex(array, value);
        if (index < length && eq(array[index], value)) {
          return index;
        }
      }
      return -1;
    }

    /**
     * This method is like `_.sortedIndex` except that it returns the highest
     * index at which `value` should be inserted into `array` in order to
     * maintain its sort order.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
     * // => 4
     */
    function sortedLastIndex(array, value) {
      return baseSortedIndex(array, value, true);
    }

    /**
     * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
     * which is invoked for `value` and each element of `array` to compute their
     * sort ranking. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The sorted array to inspect.
     * @param {*} value The value to evaluate.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the index at which `value` should be inserted
     *  into `array`.
     * @example
     *
     * var objects = [{ 'x': 4 }, { 'x': 5 }];
     *
     * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
     * // => 1
     *
     * // The `_.property` iteratee shorthand.
     * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
     * // => 1
     */
    function sortedLastIndexBy(array, value, iteratee) {
      return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
    }

    /**
     * This method is like `_.lastIndexOf` except that it performs a binary
     * search on a sorted `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {*} value The value to search for.
     * @returns {number} Returns the index of the matched value, else `-1`.
     * @example
     *
     * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
     * // => 3
     */
    function sortedLastIndexOf(array, value) {
      var length = array == null ? 0 : array.length;
      if (length) {
        var index = baseSortedIndex(array, value, true) - 1;
        if (eq(array[index], value)) {
          return index;
        }
      }
      return -1;
    }

    /**
     * This method is like `_.uniq` except that it's designed and optimized
     * for sorted arrays.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.sortedUniq([1, 1, 2]);
     * // => [1, 2]
     */
    function sortedUniq(array) {
      return (array && array.length)
        ? baseSortedUniq(array)
        : [];
    }

    /**
     * This method is like `_.uniqBy` except that it's designed and optimized
     * for sorted arrays.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
     * // => [1.1, 2.3]
     */
    function sortedUniqBy(array, iteratee) {
      return (array && array.length)
        ? baseSortedUniq(array, getIteratee(iteratee, 2))
        : [];
    }

    /**
     * Gets all but the first element of `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.tail([1, 2, 3]);
     * // => [2, 3]
     */
    function tail(array) {
      var length = array == null ? 0 : array.length;
      return length ? baseSlice(array, 1, length) : [];
    }

    /**
     * Creates a slice of `array` with `n` elements taken from the beginning.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.take([1, 2, 3]);
     * // => [1]
     *
     * _.take([1, 2, 3], 2);
     * // => [1, 2]
     *
     * _.take([1, 2, 3], 5);
     * // => [1, 2, 3]
     *
     * _.take([1, 2, 3], 0);
     * // => []
     */
    function take(array, n, guard) {
      if (!(array && array.length)) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      return baseSlice(array, 0, n < 0 ? 0 : n);
    }

    /**
     * Creates a slice of `array` with `n` elements taken from the end.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {number} [n=1] The number of elements to take.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * _.takeRight([1, 2, 3]);
     * // => [3]
     *
     * _.takeRight([1, 2, 3], 2);
     * // => [2, 3]
     *
     * _.takeRight([1, 2, 3], 5);
     * // => [1, 2, 3]
     *
     * _.takeRight([1, 2, 3], 0);
     * // => []
     */
    function takeRight(array, n, guard) {
      var length = array == null ? 0 : array.length;
      if (!length) {
        return [];
      }
      n = (guard || n === undefined) ? 1 : toInteger(n);
      n = length - n;
      return baseSlice(array, n < 0 ? 0 : n, length);
    }

    /**
     * Creates a slice of `array` with elements taken from the end. Elements are
     * taken until `predicate` returns falsey. The predicate is invoked with
     * three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': true },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': false }
     * ];
     *
     * _.takeRightWhile(users, function(o) { return !o.active; });
     * // => objects for ['fred', 'pebbles']
     *
     * // The `_.matches` iteratee shorthand.
     * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
     * // => objects for ['pebbles']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.takeRightWhile(users, ['active', false]);
     * // => objects for ['fred', 'pebbles']
     *
     * // The `_.property` iteratee shorthand.
     * _.takeRightWhile(users, 'active');
     * // => []
     */
    function takeRightWhile(array, predicate) {
      return (array && array.length)
        ? baseWhile(array, getIteratee(predicate, 3), false, true)
        : [];
    }

    /**
     * Creates a slice of `array` with elements taken from the beginning. Elements
     * are taken until `predicate` returns falsey. The predicate is invoked with
     * three arguments: (value, index, array).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Array
     * @param {Array} array The array to query.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the slice of `array`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'active': false },
     *   { 'user': 'fred',    'active': false },
     *   { 'user': 'pebbles', 'active': true }
     * ];
     *
     * _.takeWhile(users, function(o) { return !o.active; });
     * // => objects for ['barney', 'fred']
     *
     * // The `_.matches` iteratee shorthand.
     * _.takeWhile(users, { 'user': 'barney', 'active': false });
     * // => objects for ['barney']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.takeWhile(users, ['active', false]);
     * // => objects for ['barney', 'fred']
     *
     * // The `_.property` iteratee shorthand.
     * _.takeWhile(users, 'active');
     * // => []
     */
    function takeWhile(array, predicate) {
      return (array && array.length)
        ? baseWhile(array, getIteratee(predicate, 3))
        : [];
    }

    /**
     * Creates an array of unique values, in order, from all given arrays using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * _.union([2], [1, 2]);
     * // => [2, 1]
     */
    var union = baseRest(function(arrays) {
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
    });

    /**
     * This method is like `_.union` except that it accepts `iteratee` which is
     * invoked for each element of each `arrays` to generate the criterion by
     * which uniqueness is computed. Result values are chosen from the first
     * array in which the value occurs. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * _.unionBy([2.1], [1.2, 2.3], Math.floor);
     * // => [2.1, 1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
     * // => [{ 'x': 1 }, { 'x': 2 }]
     */
    var unionBy = baseRest(function(arrays) {
      var iteratee = last(arrays);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
    });

    /**
     * This method is like `_.union` except that it accepts `comparator` which
     * is invoked to compare elements of `arrays`. Result values are chosen from
     * the first array in which the value occurs. The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of combined values.
     * @example
     *
     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
     *
     * _.unionWith(objects, others, _.isEqual);
     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
     */
    var unionWith = baseRest(function(arrays) {
      var comparator = last(arrays);
      comparator = typeof comparator == 'function' ? comparator : undefined;
      return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
    });

    /**
     * Creates a duplicate-free version of an array, using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons, in which only the first occurrence of each element
     * is kept. The order of result values is determined by the order they occur
     * in the array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.uniq([2, 1, 2]);
     * // => [2, 1]
     */
    function uniq(array) {
      return (array && array.length) ? baseUniq(array) : [];
    }

    /**
     * This method is like `_.uniq` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * uniqueness is computed. The order of result values is determined by the
     * order they occur in the array. The iteratee is invoked with one argument:
     * (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
     * // => [2.1, 1.2]
     *
     * // The `_.property` iteratee shorthand.
     * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
     * // => [{ 'x': 1 }, { 'x': 2 }]
     */
    function uniqBy(array, iteratee) {
      return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
    }

    /**
     * This method is like `_.uniq` except that it accepts `comparator` which
     * is invoked to compare elements of `array`. The order of result values is
     * determined by the order they occur in the array.The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new duplicate free array.
     * @example
     *
     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
     *
     * _.uniqWith(objects, _.isEqual);
     * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
     */
    function uniqWith(array, comparator) {
      comparator = typeof comparator == 'function' ? comparator : undefined;
      return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
    }

    /**
     * This method is like `_.zip` except that it accepts an array of grouped
     * elements and creates an array regrouping the elements to their pre-zip
     * configuration.
     *
     * @static
     * @memberOf _
     * @since 1.2.0
     * @category Array
     * @param {Array} array The array of grouped elements to process.
     * @returns {Array} Returns the new array of regrouped elements.
     * @example
     *
     * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
     * // => [['a', 1, true], ['b', 2, false]]
     *
     * _.unzip(zipped);
     * // => [['a', 'b'], [1, 2], [true, false]]
     */
    function unzip(array) {
      if (!(array && array.length)) {
        return [];
      }
      var length = 0;
      array = arrayFilter(array, function(group) {
        if (isArrayLikeObject(group)) {
          length = nativeMax(group.length, length);
          return true;
        }
      });
      return baseTimes(length, function(index) {
        return arrayMap(array, baseProperty(index));
      });
    }

    /**
     * This method is like `_.unzip` except that it accepts `iteratee` to specify
     * how regrouped values should be combined. The iteratee is invoked with the
     * elements of each group: (...group).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Array
     * @param {Array} array The array of grouped elements to process.
     * @param {Function} [iteratee=_.identity] The function to combine
     *  regrouped values.
     * @returns {Array} Returns the new array of regrouped elements.
     * @example
     *
     * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
     * // => [[1, 10, 100], [2, 20, 200]]
     *
     * _.unzipWith(zipped, _.add);
     * // => [3, 30, 300]
     */
    function unzipWith(array, iteratee) {
      if (!(array && array.length)) {
        return [];
      }
      var result = unzip(array);
      if (iteratee == null) {
        return result;
      }
      return arrayMap(result, function(group) {
        return apply(iteratee, undefined, group);
      });
    }

    /**
     * Creates an array excluding all given values using
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * for equality comparisons.
     *
     * **Note:** Unlike `_.pull`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {Array} array The array to inspect.
     * @param {...*} [values] The values to exclude.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.difference, _.xor
     * @example
     *
     * _.without([2, 1, 2, 3], 1, 2);
     * // => [3]
     */
    var without = baseRest(function(array, values) {
      return isArrayLikeObject(array)
        ? baseDifference(array, values)
        : [];
    });

    /**
     * Creates an array of unique values that is the
     * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
     * of the given arrays. The order of result values is determined by the order
     * they occur in the arrays.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @returns {Array} Returns the new array of filtered values.
     * @see _.difference, _.without
     * @example
     *
     * _.xor([2, 1], [2, 3]);
     * // => [1, 3]
     */
    var xor = baseRest(function(arrays) {
      return baseXor(arrayFilter(arrays, isArrayLikeObject));
    });

    /**
     * This method is like `_.xor` except that it accepts `iteratee` which is
     * invoked for each element of each `arrays` to generate the criterion by
     * which by which they're compared. The order of result values is determined
     * by the order they occur in the arrays. The iteratee is invoked with one
     * argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
     * // => [1.2, 3.4]
     *
     * // The `_.property` iteratee shorthand.
     * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
     * // => [{ 'x': 2 }]
     */
    var xorBy = baseRest(function(arrays) {
      var iteratee = last(arrays);
      if (isArrayLikeObject(iteratee)) {
        iteratee = undefined;
      }
      return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
    });

    /**
     * This method is like `_.xor` except that it accepts `comparator` which is
     * invoked to compare elements of `arrays`. The order of result values is
     * determined by the order they occur in the arrays. The comparator is invoked
     * with two arguments: (arrVal, othVal).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Array
     * @param {...Array} [arrays] The arrays to inspect.
     * @param {Function} [comparator] The comparator invoked per element.
     * @returns {Array} Returns the new array of filtered values.
     * @example
     *
     * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
     * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
     *
     * _.xorWith(objects, others, _.isEqual);
     * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
     */
    var xorWith = baseRest(function(arrays) {
      var comparator = last(arrays);
      comparator = typeof comparator == 'function' ? comparator : undefined;
      return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
    });

    /**
     * Creates an array of grouped elements, the first of which contains the
     * first elements of the given arrays, the second of which contains the
     * second elements of the given arrays, and so on.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Array
     * @param {...Array} [arrays] The arrays to process.
     * @returns {Array} Returns the new array of grouped elements.
     * @example
     *
     * _.zip(['a', 'b'], [1, 2], [true, false]);
     * // => [['a', 1, true], ['b', 2, false]]
     */
    var zip = baseRest(unzip);

    /**
     * This method is like `_.fromPairs` except that it accepts two arrays,
     * one of property identifiers and one of corresponding values.
     *
     * @static
     * @memberOf _
     * @since 0.4.0
     * @category Array
     * @param {Array} [props=[]] The property identifiers.
     * @param {Array} [values=[]] The property values.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.zipObject(['a', 'b'], [1, 2]);
     * // => { 'a': 1, 'b': 2 }
     */
    function zipObject(props, values) {
      return baseZipObject(props || [], values || [], assignValue);
    }

    /**
     * This method is like `_.zipObject` except that it supports property paths.
     *
     * @static
     * @memberOf _
     * @since 4.1.0
     * @category Array
     * @param {Array} [props=[]] The property identifiers.
     * @param {Array} [values=[]] The property values.
     * @returns {Object} Returns the new object.
     * @example
     *
     * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
     * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
     */
    function zipObjectDeep(props, values) {
      return baseZipObject(props || [], values || [], baseSet);
    }

    /**
     * This method is like `_.zip` except that it accepts `iteratee` to specify
     * how grouped values should be combined. The iteratee is invoked with the
     * elements of each group: (...group).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Array
     * @param {...Array} [arrays] The arrays to process.
     * @param {Function} [iteratee=_.identity] The function to combine
     *  grouped values.
     * @returns {Array} Returns the new array of grouped elements.
     * @example
     *
     * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
     *   return a + b + c;
     * });
     * // => [111, 222]
     */
    var zipWith = baseRest(function(arrays) {
      var length = arrays.length,
          iteratee = length > 1 ? arrays[length - 1] : undefined;

      iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
      return unzipWith(arrays, iteratee);
    });

    /*------------------------------------------------------------------------*/

    /**
     * Creates a `lodash` wrapper instance that wraps `value` with explicit method
     * chain sequences enabled. The result of such sequences must be unwrapped
     * with `_#value`.
     *
     * @static
     * @memberOf _
     * @since 1.3.0
     * @category Seq
     * @param {*} value The value to wrap.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36 },
     *   { 'user': 'fred',    'age': 40 },
     *   { 'user': 'pebbles', 'age': 1 }
     * ];
     *
     * var youngest = _
     *   .chain(users)
     *   .sortBy('age')
     *   .map(function(o) {
     *     return o.user + ' is ' + o.age;
     *   })
     *   .head()
     *   .value();
     * // => 'pebbles is 1'
     */
    function chain(value) {
      var result = lodash(value);
      result.__chain__ = true;
      return result;
    }

    /**
     * This method invokes `interceptor` and returns `value`. The interceptor
     * is invoked with one argument; (value). The purpose of this method is to
     * "tap into" a method chain sequence in order to modify intermediate results.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @returns {*} Returns `value`.
     * @example
     *
     * _([1, 2, 3])
     *  .tap(function(array) {
     *    // Mutate input array.
     *    array.pop();
     *  })
     *  .reverse()
     *  .value();
     * // => [2, 1]
     */
    function tap(value, interceptor) {
      interceptor(value);
      return value;
    }

    /**
     * This method is like `_.tap` except that it returns the result of `interceptor`.
     * The purpose of this method is to "pass thru" values replacing intermediate
     * results in a method chain sequence.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Seq
     * @param {*} value The value to provide to `interceptor`.
     * @param {Function} interceptor The function to invoke.
     * @returns {*} Returns the result of `interceptor`.
     * @example
     *
     * _('  abc  ')
     *  .chain()
     *  .trim()
     *  .thru(function(value) {
     *    return [value];
     *  })
     *  .value();
     * // => ['abc']
     */
    function thru(value, interceptor) {
      return interceptor(value);
    }

    /**
     * This method is the wrapper version of `_.at`.
     *
     * @name at
     * @memberOf _
     * @since 1.0.0
     * @category Seq
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
     *
     * _(object).at(['a[0].b.c', 'a[1]']).value();
     * // => [3, 4]
     */
    var wrapperAt = flatRest(function(paths) {
      var length = paths.length,
          start = length ? paths[0] : 0,
          value = this.__wrapped__,
          interceptor = function(object) { return baseAt(object, paths); };

      if (length > 1 || this.__actions__.length ||
          !(value instanceof LazyWrapper) || !isIndex(start)) {
        return this.thru(interceptor);
      }
      value = value.slice(start, +start + (length ? 1 : 0));
      value.__actions__.push({
        'func': thru,
        'args': [interceptor],
        'thisArg': undefined
      });
      return new LodashWrapper(value, this.__chain__).thru(function(array) {
        if (length && !array.length) {
          array.push(undefined);
        }
        return array;
      });
    });

    /**
     * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
     *
     * @name chain
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 40 }
     * ];
     *
     * // A sequence without explicit chaining.
     * _(users).head();
     * // => { 'user': 'barney', 'age': 36 }
     *
     * // A sequence with explicit chaining.
     * _(users)
     *   .chain()
     *   .head()
     *   .pick('user')
     *   .value();
     * // => { 'user': 'barney' }
     */
    function wrapperChain() {
      return chain(this);
    }

    /**
     * Executes the chain sequence and returns the wrapped result.
     *
     * @name commit
     * @memberOf _
     * @since 3.2.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2];
     * var wrapped = _(array).push(3);
     *
     * console.log(array);
     * // => [1, 2]
     *
     * wrapped = wrapped.commit();
     * console.log(array);
     * // => [1, 2, 3]
     *
     * wrapped.last();
     * // => 3
     *
     * console.log(array);
     * // => [1, 2, 3]
     */
    function wrapperCommit() {
      return new LodashWrapper(this.value(), this.__chain__);
    }

    /**
     * Gets the next value on a wrapped object following the
     * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
     *
     * @name next
     * @memberOf _
     * @since 4.0.0
     * @category Seq
     * @returns {Object} Returns the next iterator value.
     * @example
     *
     * var wrapped = _([1, 2]);
     *
     * wrapped.next();
     * // => { 'done': false, 'value': 1 }
     *
     * wrapped.next();
     * // => { 'done': false, 'value': 2 }
     *
     * wrapped.next();
     * // => { 'done': true, 'value': undefined }
     */
    function wrapperNext() {
      if (this.__values__ === undefined) {
        this.__values__ = toArray(this.value());
      }
      var done = this.__index__ >= this.__values__.length,
          value = done ? undefined : this.__values__[this.__index__++];

      return { 'done': done, 'value': value };
    }

    /**
     * Enables the wrapper to be iterable.
     *
     * @name Symbol.iterator
     * @memberOf _
     * @since 4.0.0
     * @category Seq
     * @returns {Object} Returns the wrapper object.
     * @example
     *
     * var wrapped = _([1, 2]);
     *
     * wrapped[Symbol.iterator]() === wrapped;
     * // => true
     *
     * Array.from(wrapped);
     * // => [1, 2]
     */
    function wrapperToIterator() {
      return this;
    }

    /**
     * Creates a clone of the chain sequence planting `value` as the wrapped value.
     *
     * @name plant
     * @memberOf _
     * @since 3.2.0
     * @category Seq
     * @param {*} value The value to plant.
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var wrapped = _([1, 2]).map(square);
     * var other = wrapped.plant([3, 4]);
     *
     * other.value();
     * // => [9, 16]
     *
     * wrapped.value();
     * // => [1, 4]
     */
    function wrapperPlant(value) {
      var result,
          parent = this;

      while (parent instanceof baseLodash) {
        var clone = wrapperClone(parent);
        clone.__index__ = 0;
        clone.__values__ = undefined;
        if (result) {
          previous.__wrapped__ = clone;
        } else {
          result = clone;
        }
        var previous = clone;
        parent = parent.__wrapped__;
      }
      previous.__wrapped__ = value;
      return result;
    }

    /**
     * This method is the wrapper version of `_.reverse`.
     *
     * **Note:** This method mutates the wrapped array.
     *
     * @name reverse
     * @memberOf _
     * @since 0.1.0
     * @category Seq
     * @returns {Object} Returns the new `lodash` wrapper instance.
     * @example
     *
     * var array = [1, 2, 3];
     *
     * _(array).reverse().value()
     * // => [3, 2, 1]
     *
     * console.log(array);
     * // => [3, 2, 1]
     */
    function wrapperReverse() {
      var value = this.__wrapped__;
      if (value instanceof LazyWrapper) {
        var wrapped = value;
        if (this.__actions__.length) {
          wrapped = new LazyWrapper(this);
        }
        wrapped = wrapped.reverse();
        wrapped.__actions__.push({
          'func': thru,
          'args': [reverse],
          'thisArg': undefined
        });
        return new LodashWrapper(wrapped, this.__chain__);
      }
      return this.thru(reverse);
    }

    /**
     * Executes the chain sequence to resolve the unwrapped value.
     *
     * @name value
     * @memberOf _
     * @since 0.1.0
     * @alias toJSON, valueOf
     * @category Seq
     * @returns {*} Returns the resolved unwrapped value.
     * @example
     *
     * _([1, 2, 3]).value();
     * // => [1, 2, 3]
     */
    function wrapperValue() {
      return baseWrapperValue(this.__wrapped__, this.__actions__);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The corresponding value of
     * each key is the number of times the key was returned by `iteratee`. The
     * iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.countBy([6.1, 4.2, 6.3], Math.floor);
     * // => { '4': 1, '6': 2 }
     *
     * // The `_.property` iteratee shorthand.
     * _.countBy(['one', 'two', 'three'], 'length');
     * // => { '3': 2, '5': 1 }
     */
    var countBy = createAggregator(function(result, value, key) {
      if (hasOwnProperty.call(result, key)) {
        ++result[key];
      } else {
        baseAssignValue(result, key, 1);
      }
    });

    /**
     * Checks if `predicate` returns truthy for **all** elements of `collection`.
     * Iteration is stopped once `predicate` returns falsey. The predicate is
     * invoked with three arguments: (value, index|key, collection).
     *
     * **Note:** This method returns `true` for
     * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
     * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
     * elements of empty collections.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {boolean} Returns `true` if all elements pass the predicate check,
     *  else `false`.
     * @example
     *
     * _.every([true, 1, null, 'yes'], Boolean);
     * // => false
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': false },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.every(users, { 'user': 'barney', 'active': false });
     * // => false
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.every(users, ['active', false]);
     * // => true
     *
     * // The `_.property` iteratee shorthand.
     * _.every(users, 'active');
     * // => false
     */
    function every(collection, predicate, guard) {
      var func = isArray(collection) ? arrayEvery : baseEvery;
      if (guard && isIterateeCall(collection, predicate, guard)) {
        predicate = undefined;
      }
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Iterates over elements of `collection`, returning an array of all elements
     * `predicate` returns truthy for. The predicate is invoked with three
     * arguments: (value, index|key, collection).
     *
     * **Note:** Unlike `_.remove`, this method returns a new array.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     * @see _.reject
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': true },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * _.filter(users, function(o) { return !o.active; });
     * // => objects for ['fred']
     *
     * // The `_.matches` iteratee shorthand.
     * _.filter(users, { 'age': 36, 'active': true });
     * // => objects for ['barney']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.filter(users, ['active', false]);
     * // => objects for ['fred']
     *
     * // The `_.property` iteratee shorthand.
     * _.filter(users, 'active');
     * // => objects for ['barney']
     *
     * // Combining several predicates using `_.overEvery` or `_.overSome`.
     * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
     * // => objects for ['fred', 'barney']
     */
    function filter(collection, predicate) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Iterates over elements of `collection`, returning the first element
     * `predicate` returns truthy for. The predicate is invoked with three
     * arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=0] The index to search from.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36, 'active': true },
     *   { 'user': 'fred',    'age': 40, 'active': false },
     *   { 'user': 'pebbles', 'age': 1,  'active': true }
     * ];
     *
     * _.find(users, function(o) { return o.age < 40; });
     * // => object for 'barney'
     *
     * // The `_.matches` iteratee shorthand.
     * _.find(users, { 'age': 1, 'active': true });
     * // => object for 'pebbles'
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.find(users, ['active', false]);
     * // => object for 'fred'
     *
     * // The `_.property` iteratee shorthand.
     * _.find(users, 'active');
     * // => object for 'barney'
     */
    var find = createFind(findIndex);

    /**
     * This method is like `_.find` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param {number} [fromIndex=collection.length-1] The index to search from.
     * @returns {*} Returns the matched element, else `undefined`.
     * @example
     *
     * _.findLast([1, 2, 3, 4], function(n) {
     *   return n % 2 == 1;
     * });
     * // => 3
     */
    var findLast = createFind(findLastIndex);

    /**
     * Creates a flattened array of values by running each element in `collection`
     * thru `iteratee` and flattening the mapped results. The iteratee is invoked
     * with three arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [n, n];
     * }
     *
     * _.flatMap([1, 2], duplicate);
     * // => [1, 1, 2, 2]
     */
    function flatMap(collection, iteratee) {
      return baseFlatten(map(collection, iteratee), 1);
    }

    /**
     * This method is like `_.flatMap` except that it recursively flattens the
     * mapped results.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
     *
     * _.flatMapDeep([1, 2], duplicate);
     * // => [1, 1, 2, 2]
     */
    function flatMapDeep(collection, iteratee) {
      return baseFlatten(map(collection, iteratee), INFINITY);
    }

    /**
     * This method is like `_.flatMap` except that it recursively flattens the
     * mapped results up to `depth` times.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {number} [depth=1] The maximum recursion depth.
     * @returns {Array} Returns the new flattened array.
     * @example
     *
     * function duplicate(n) {
     *   return [[[n, n]]];
     * }
     *
     * _.flatMapDepth([1, 2], duplicate, 2);
     * // => [[1, 1], [2, 2]]
     */
    function flatMapDepth(collection, iteratee, depth) {
      depth = depth === undefined ? 1 : toInteger(depth);
      return baseFlatten(map(collection, iteratee), depth);
    }

    /**
     * Iterates over elements of `collection` and invokes `iteratee` for each element.
     * The iteratee is invoked with three arguments: (value, index|key, collection).
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * **Note:** As with other "Collections" methods, objects with a "length"
     * property are iterated like arrays. To avoid this behavior use `_.forIn`
     * or `_.forOwn` for object iteration.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @alias each
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     * @see _.forEachRight
     * @example
     *
     * _.forEach([1, 2], function(value) {
     *   console.log(value);
     * });
     * // => Logs `1` then `2`.
     *
     * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
     *   console.log(key);
     * });
     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
     */
    function forEach(collection, iteratee) {
      var func = isArray(collection) ? arrayEach : baseEach;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.forEach` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @alias eachRight
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array|Object} Returns `collection`.
     * @see _.forEach
     * @example
     *
     * _.forEachRight([1, 2], function(value) {
     *   console.log(value);
     * });
     * // => Logs `2` then `1`.
     */
    function forEachRight(collection, iteratee) {
      var func = isArray(collection) ? arrayEachRight : baseEachRight;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The order of grouped values
     * is determined by the order they occur in `collection`. The corresponding
     * value of each key is an array of elements responsible for generating the
     * key. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * _.groupBy([6.1, 4.2, 6.3], Math.floor);
     * // => { '4': [4.2], '6': [6.1, 6.3] }
     *
     * // The `_.property` iteratee shorthand.
     * _.groupBy(['one', 'two', 'three'], 'length');
     * // => { '3': ['one', 'two'], '5': ['three'] }
     */
    var groupBy = createAggregator(function(result, value, key) {
      if (hasOwnProperty.call(result, key)) {
        result[key].push(value);
      } else {
        baseAssignValue(result, key, [value]);
      }
    });

    /**
     * Checks if `value` is in `collection`. If `collection` is a string, it's
     * checked for a substring of `value`, otherwise
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * is used for equality comparisons. If `fromIndex` is negative, it's used as
     * the offset from the end of `collection`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object|string} collection The collection to inspect.
     * @param {*} value The value to search for.
     * @param {number} [fromIndex=0] The index to search from.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
     * @returns {boolean} Returns `true` if `value` is found, else `false`.
     * @example
     *
     * _.includes([1, 2, 3], 1);
     * // => true
     *
     * _.includes([1, 2, 3], 1, 2);
     * // => false
     *
     * _.includes({ 'a': 1, 'b': 2 }, 1);
     * // => true
     *
     * _.includes('abcd', 'bc');
     * // => true
     */
    function includes(collection, value, fromIndex, guard) {
      collection = isArrayLike(collection) ? collection : values(collection);
      fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;

      var length = collection.length;
      if (fromIndex < 0) {
        fromIndex = nativeMax(length + fromIndex, 0);
      }
      return isString(collection)
        ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
        : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
    }

    /**
     * Invokes the method at `path` of each element in `collection`, returning
     * an array of the results of each invoked method. Any additional arguments
     * are provided to each invoked method. If `path` is a function, it's invoked
     * for, and `this` bound to, each element in `collection`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Array|Function|string} path The path of the method to invoke or
     *  the function invoked per iteration.
     * @param {...*} [args] The arguments to invoke each method with.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
     * // => [[1, 5, 7], [1, 2, 3]]
     *
     * _.invokeMap([123, 456], String.prototype.split, '');
     * // => [['1', '2', '3'], ['4', '5', '6']]
     */
    var invokeMap = baseRest(function(collection, path, args) {
      var index = -1,
          isFunc = typeof path == 'function',
          result = isArrayLike(collection) ? Array(collection.length) : [];

      baseEach(collection, function(value) {
        result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
      });
      return result;
    });

    /**
     * Creates an object composed of keys generated from the results of running
     * each element of `collection` thru `iteratee`. The corresponding value of
     * each key is the last element responsible for generating the key. The
     * iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
     * @returns {Object} Returns the composed aggregate object.
     * @example
     *
     * var array = [
     *   { 'dir': 'left', 'code': 97 },
     *   { 'dir': 'right', 'code': 100 }
     * ];
     *
     * _.keyBy(array, function(o) {
     *   return String.fromCharCode(o.code);
     * });
     * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
     *
     * _.keyBy(array, 'dir');
     * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
     */
    var keyBy = createAggregator(function(result, value, key) {
      baseAssignValue(result, key, value);
    });

    /**
     * Creates an array of values by running each element in `collection` thru
     * `iteratee`. The iteratee is invoked with three arguments:
     * (value, index|key, collection).
     *
     * Many lodash methods are guarded to work as iteratees for methods like
     * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
     *
     * The guarded methods are:
     * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
     * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
     * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
     * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new mapped array.
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * _.map([4, 8], square);
     * // => [16, 64]
     *
     * _.map({ 'a': 4, 'b': 8 }, square);
     * // => [16, 64] (iteration order is not guaranteed)
     *
     * var users = [
     *   { 'user': 'barney' },
     *   { 'user': 'fred' }
     * ];
     *
     * // The `_.property` iteratee shorthand.
     * _.map(users, 'user');
     * // => ['barney', 'fred']
     */
    function map(collection, iteratee) {
      var func = isArray(collection) ? arrayMap : baseMap;
      return func(collection, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.sortBy` except that it allows specifying the sort
     * orders of the iteratees to sort by. If `orders` is unspecified, all values
     * are sorted in ascending order. Otherwise, specify an order of "desc" for
     * descending or "asc" for ascending sort order of corresponding values.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
     *  The iteratees to sort by.
     * @param {string[]} [orders] The sort orders of `iteratees`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { 'user': 'fred',   'age': 48 },
     *   { 'user': 'barney', 'age': 34 },
     *   { 'user': 'fred',   'age': 40 },
     *   { 'user': 'barney', 'age': 36 }
     * ];
     *
     * // Sort by `user` in ascending order and by `age` in descending order.
     * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
     */
    function orderBy(collection, iteratees, orders, guard) {
      if (collection == null) {
        return [];
      }
      if (!isArray(iteratees)) {
        iteratees = iteratees == null ? [] : [iteratees];
      }
      orders = guard ? undefined : orders;
      if (!isArray(orders)) {
        orders = orders == null ? [] : [orders];
      }
      return baseOrderBy(collection, iteratees, orders);
    }

    /**
     * Creates an array of elements split into two groups, the first of which
     * contains elements `predicate` returns truthy for, the second of which
     * contains elements `predicate` returns falsey for. The predicate is
     * invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the array of grouped elements.
     * @example
     *
     * var users = [
     *   { 'user': 'barney',  'age': 36, 'active': false },
     *   { 'user': 'fred',    'age': 40, 'active': true },
     *   { 'user': 'pebbles', 'age': 1,  'active': false }
     * ];
     *
     * _.partition(users, function(o) { return o.active; });
     * // => objects for [['fred'], ['barney', 'pebbles']]
     *
     * // The `_.matches` iteratee shorthand.
     * _.partition(users, { 'age': 1, 'active': false });
     * // => objects for [['pebbles'], ['barney', 'fred']]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.partition(users, ['active', false]);
     * // => objects for [['barney', 'pebbles'], ['fred']]
     *
     * // The `_.property` iteratee shorthand.
     * _.partition(users, 'active');
     * // => objects for [['fred'], ['barney', 'pebbles']]
     */
    var partition = createAggregator(function(result, value, key) {
      result[key ? 0 : 1].push(value);
    }, function() { return [[], []]; });

    /**
     * Reduces `collection` to a value which is the accumulated result of running
     * each element in `collection` thru `iteratee`, where each successive
     * invocation is supplied the return value of the previous. If `accumulator`
     * is not given, the first element of `collection` is used as the initial
     * value. The iteratee is invoked with four arguments:
     * (accumulator, value, index|key, collection).
     *
     * Many lodash methods are guarded to work as iteratees for methods like
     * `_.reduce`, `_.reduceRight`, and `_.transform`.
     *
     * The guarded methods are:
     * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
     * and `sortBy`
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @returns {*} Returns the accumulated value.
     * @see _.reduceRight
     * @example
     *
     * _.reduce([1, 2], function(sum, n) {
     *   return sum + n;
     * }, 0);
     * // => 3
     *
     * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     *   return result;
     * }, {});
     * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
     */
    function reduce(collection, iteratee, accumulator) {
      var func = isArray(collection) ? arrayReduce : baseReduce,
          initAccum = arguments.length < 3;

      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
    }

    /**
     * This method is like `_.reduce` except that it iterates over elements of
     * `collection` from right to left.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The initial value.
     * @returns {*} Returns the accumulated value.
     * @see _.reduce
     * @example
     *
     * var array = [[0, 1], [2, 3], [4, 5]];
     *
     * _.reduceRight(array, function(flattened, other) {
     *   return flattened.concat(other);
     * }, []);
     * // => [4, 5, 2, 3, 0, 1]
     */
    function reduceRight(collection, iteratee, accumulator) {
      var func = isArray(collection) ? arrayReduceRight : baseReduce,
          initAccum = arguments.length < 3;

      return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
    }

    /**
     * The opposite of `_.filter`; this method returns the elements of `collection`
     * that `predicate` does **not** return truthy for.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the new filtered array.
     * @see _.filter
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': false },
     *   { 'user': 'fred',   'age': 40, 'active': true }
     * ];
     *
     * _.reject(users, function(o) { return !o.active; });
     * // => objects for ['fred']
     *
     * // The `_.matches` iteratee shorthand.
     * _.reject(users, { 'age': 40, 'active': true });
     * // => objects for ['barney']
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.reject(users, ['active', false]);
     * // => objects for ['fred']
     *
     * // The `_.property` iteratee shorthand.
     * _.reject(users, 'active');
     * // => objects for ['barney']
     */
    function reject(collection, predicate) {
      var func = isArray(collection) ? arrayFilter : baseFilter;
      return func(collection, negate(getIteratee(predicate, 3)));
    }

    /**
     * Gets a random element from `collection`.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to sample.
     * @returns {*} Returns the random element.
     * @example
     *
     * _.sample([1, 2, 3, 4]);
     * // => 2
     */
    function sample(collection) {
      var func = isArray(collection) ? arraySample : baseSample;
      return func(collection);
    }

    /**
     * Gets `n` random elements at unique keys from `collection` up to the
     * size of `collection`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Collection
     * @param {Array|Object} collection The collection to sample.
     * @param {number} [n=1] The number of elements to sample.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the random elements.
     * @example
     *
     * _.sampleSize([1, 2, 3], 2);
     * // => [3, 1]
     *
     * _.sampleSize([1, 2, 3], 4);
     * // => [2, 3, 1]
     */
    function sampleSize(collection, n, guard) {
      if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
        n = 1;
      } else {
        n = toInteger(n);
      }
      var func = isArray(collection) ? arraySampleSize : baseSampleSize;
      return func(collection, n);
    }

    /**
     * Creates an array of shuffled values, using a version of the
     * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to shuffle.
     * @returns {Array} Returns the new shuffled array.
     * @example
     *
     * _.shuffle([1, 2, 3, 4]);
     * // => [4, 1, 3, 2]
     */
    function shuffle(collection) {
      var func = isArray(collection) ? arrayShuffle : baseShuffle;
      return func(collection);
    }

    /**
     * Gets the size of `collection` by returning its length for array-like
     * values or the number of own enumerable string keyed properties for objects.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object|string} collection The collection to inspect.
     * @returns {number} Returns the collection size.
     * @example
     *
     * _.size([1, 2, 3]);
     * // => 3
     *
     * _.size({ 'a': 1, 'b': 2 });
     * // => 2
     *
     * _.size('pebbles');
     * // => 7
     */
    function size(collection) {
      if (collection == null) {
        return 0;
      }
      if (isArrayLike(collection)) {
        return isString(collection) ? stringSize(collection) : collection.length;
      }
      var tag = getTag(collection);
      if (tag == mapTag || tag == setTag) {
        return collection.size;
      }
      return baseKeys(collection).length;
    }

    /**
     * Checks if `predicate` returns truthy for **any** element of `collection`.
     * Iteration is stopped once `predicate` returns truthy. The predicate is
     * invoked with three arguments: (value, index|key, collection).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {boolean} Returns `true` if any element passes the predicate check,
     *  else `false`.
     * @example
     *
     * _.some([null, 0, 'yes', false], Boolean);
     * // => true
     *
     * var users = [
     *   { 'user': 'barney', 'active': true },
     *   { 'user': 'fred',   'active': false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.some(users, { 'user': 'barney', 'active': false });
     * // => false
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.some(users, ['active', false]);
     * // => true
     *
     * // The `_.property` iteratee shorthand.
     * _.some(users, 'active');
     * // => true
     */
    function some(collection, predicate, guard) {
      var func = isArray(collection) ? arraySome : baseSome;
      if (guard && isIterateeCall(collection, predicate, guard)) {
        predicate = undefined;
      }
      return func(collection, getIteratee(predicate, 3));
    }

    /**
     * Creates an array of elements, sorted in ascending order by the results of
     * running each element in a collection thru each iteratee. This method
     * performs a stable sort, that is, it preserves the original sort order of
     * equal elements. The iteratees are invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Collection
     * @param {Array|Object} collection The collection to iterate over.
     * @param {...(Function|Function[])} [iteratees=[_.identity]]
     *  The iteratees to sort by.
     * @returns {Array} Returns the new sorted array.
     * @example
     *
     * var users = [
     *   { 'user': 'fred',   'age': 48 },
     *   { 'user': 'barney', 'age': 36 },
     *   { 'user': 'fred',   'age': 30 },
     *   { 'user': 'barney', 'age': 34 }
     * ];
     *
     * _.sortBy(users, [function(o) { return o.user; }]);
     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
     *
     * _.sortBy(users, ['user', 'age']);
     * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
     */
    var sortBy = baseRest(function(collection, iteratees) {
      if (collection == null) {
        return [];
      }
      var length = iteratees.length;
      if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
        iteratees = [];
      } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
        iteratees = [iteratees[0]];
      }
      return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
    });

    /*------------------------------------------------------------------------*/

    /**
     * Gets the timestamp of the number of milliseconds that have elapsed since
     * the Unix epoch (1 January 1970 00:00:00 UTC).
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Date
     * @returns {number} Returns the timestamp.
     * @example
     *
     * _.defer(function(stamp) {
     *   console.log(_.now() - stamp);
     * }, _.now());
     * // => Logs the number of milliseconds it took for the deferred invocation.
     */
    var now = ctxNow || function() {
      return root.Date.now();
    };

    /*------------------------------------------------------------------------*/

    /**
     * The opposite of `_.before`; this method creates a function that invokes
     * `func` once it's called `n` or more times.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {number} n The number of calls before `func` is invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var saves = ['profile', 'settings'];
     *
     * var done = _.after(saves.length, function() {
     *   console.log('done saving!');
     * });
     *
     * _.forEach(saves, function(type) {
     *   asyncSave({ 'type': type, 'complete': done });
     * });
     * // => Logs 'done saving!' after the two async saves have completed.
     */
    function after(n, func) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      n = toInteger(n);
      return function() {
        if (--n < 1) {
          return func.apply(this, arguments);
        }
      };
    }

    /**
     * Creates a function that invokes `func`, with up to `n` arguments,
     * ignoring any additional arguments.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to cap arguments for.
     * @param {number} [n=func.length] The arity cap.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new capped function.
     * @example
     *
     * _.map(['6', '8', '10'], _.ary(parseInt, 1));
     * // => [6, 8, 10]
     */
    function ary(func, n, guard) {
      n = guard ? undefined : n;
      n = (func && n == null) ? func.length : n;
      return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
    }

    /**
     * Creates a function that invokes `func`, with the `this` binding and arguments
     * of the created function, while it's called less than `n` times. Subsequent
     * calls to the created function return the result of the last `func` invocation.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {number} n The number of calls at which `func` is no longer invoked.
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * jQuery(element).on('click', _.before(5, addContactToList));
     * // => Allows adding up to 4 contacts to the list.
     */
    function before(n, func) {
      var result;
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      n = toInteger(n);
      return function() {
        if (--n > 0) {
          result = func.apply(this, arguments);
        }
        if (n <= 1) {
          func = undefined;
        }
        return result;
      };
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of `thisArg`
     * and `partials` prepended to the arguments it receives.
     *
     * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for partially applied arguments.
     *
     * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
     * property of bound functions.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to bind.
     * @param {*} thisArg The `this` binding of `func`.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * function greet(greeting, punctuation) {
     *   return greeting + ' ' + this.user + punctuation;
     * }
     *
     * var object = { 'user': 'fred' };
     *
     * var bound = _.bind(greet, object, 'hi');
     * bound('!');
     * // => 'hi fred!'
     *
     * // Bound with placeholders.
     * var bound = _.bind(greet, object, _, '!');
     * bound('hi');
     * // => 'hi fred!'
     */
    var bind = baseRest(function(func, thisArg, partials) {
      var bitmask = WRAP_BIND_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, getHolder(bind));
        bitmask |= WRAP_PARTIAL_FLAG;
      }
      return createWrap(func, bitmask, thisArg, partials, holders);
    });

    /**
     * Creates a function that invokes the method at `object[key]` with `partials`
     * prepended to the arguments it receives.
     *
     * This method differs from `_.bind` by allowing bound functions to reference
     * methods that may be redefined or don't yet exist. See
     * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
     * for more details.
     *
     * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * @static
     * @memberOf _
     * @since 0.10.0
     * @category Function
     * @param {Object} object The object to invoke the method on.
     * @param {string} key The key of the method.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new bound function.
     * @example
     *
     * var object = {
     *   'user': 'fred',
     *   'greet': function(greeting, punctuation) {
     *     return greeting + ' ' + this.user + punctuation;
     *   }
     * };
     *
     * var bound = _.bindKey(object, 'greet', 'hi');
     * bound('!');
     * // => 'hi fred!'
     *
     * object.greet = function(greeting, punctuation) {
     *   return greeting + 'ya ' + this.user + punctuation;
     * };
     *
     * bound('!');
     * // => 'hiya fred!'
     *
     * // Bound with placeholders.
     * var bound = _.bindKey(object, 'greet', _, '!');
     * bound('hi');
     * // => 'hiya fred!'
     */
    var bindKey = baseRest(function(object, key, partials) {
      var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
      if (partials.length) {
        var holders = replaceHolders(partials, getHolder(bindKey));
        bitmask |= WRAP_PARTIAL_FLAG;
      }
      return createWrap(key, bitmask, object, partials, holders);
    });

    /**
     * Creates a function that accepts arguments of `func` and either invokes
     * `func` returning its result, if at least `arity` number of arguments have
     * been provided, or returns a function that accepts the remaining `func`
     * arguments, and so on. The arity of `func` may be specified if `func.length`
     * is not sufficient.
     *
     * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
     * may be used as a placeholder for provided arguments.
     *
     * **Note:** This method doesn't set the "length" property of curried functions.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curry(abc);
     *
     * curried(1)(2)(3);
     * // => [1, 2, 3]
     *
     * curried(1, 2)(3);
     * // => [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // => [1, 2, 3]
     *
     * // Curried with placeholders.
     * curried(1)(_, 3)(2);
     * // => [1, 2, 3]
     */
    function curry(func, arity, guard) {
      arity = guard ? undefined : arity;
      var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
      result.placeholder = curry.placeholder;
      return result;
    }

    /**
     * This method is like `_.curry` except that arguments are applied to `func`
     * in the manner of `_.partialRight` instead of `_.partial`.
     *
     * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for provided arguments.
     *
     * **Note:** This method doesn't set the "length" property of curried functions.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to curry.
     * @param {number} [arity=func.length] The arity of `func`.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the new curried function.
     * @example
     *
     * var abc = function(a, b, c) {
     *   return [a, b, c];
     * };
     *
     * var curried = _.curryRight(abc);
     *
     * curried(3)(2)(1);
     * // => [1, 2, 3]
     *
     * curried(2, 3)(1);
     * // => [1, 2, 3]
     *
     * curried(1, 2, 3);
     * // => [1, 2, 3]
     *
     * // Curried with placeholders.
     * curried(3)(1, _)(2);
     * // => [1, 2, 3]
     */
    function curryRight(func, arity, guard) {
      arity = guard ? undefined : arity;
      var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
      result.placeholder = curryRight.placeholder;
      return result;
    }

    /**
     * Creates a debounced function that delays invoking `func` until after `wait`
     * milliseconds have elapsed since the last time the debounced function was
     * invoked. The debounced function comes with a `cancel` method to cancel
     * delayed `func` invocations and a `flush` method to immediately invoke them.
     * Provide `options` to indicate whether `func` should be invoked on the
     * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
     * with the last arguments provided to the debounced function. Subsequent
     * calls to the debounced function return the result of the last `func`
     * invocation.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is
     * invoked on the trailing edge of the timeout only if the debounced function
     * is invoked more than once during the `wait` timeout.
     *
     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
     *
     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
     * for details over the differences between `_.debounce` and `_.throttle`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to debounce.
     * @param {number} [wait=0] The number of milliseconds to delay.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.leading=false]
     *  Specify invoking on the leading edge of the timeout.
     * @param {number} [options.maxWait]
     *  The maximum time `func` is allowed to be delayed before it's invoked.
     * @param {boolean} [options.trailing=true]
     *  Specify invoking on the trailing edge of the timeout.
     * @returns {Function} Returns the new debounced function.
     * @example
     *
     * // Avoid costly calculations while the window size is in flux.
     * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
     *
     * // Invoke `sendMail` when clicked, debouncing subsequent calls.
     * jQuery(element).on('click', _.debounce(sendMail, 300, {
     *   'leading': true,
     *   'trailing': false
     * }));
     *
     * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
     * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
     * var source = new EventSource('/stream');
     * jQuery(source).on('message', debounced);
     *
     * // Cancel the trailing debounced invocation.
     * jQuery(window).on('popstate', debounced.cancel);
     */
    function debounce(func, wait, options) {
      var lastArgs,
          lastThis,
          maxWait,
          result,
          timerId,
          lastCallTime,
          lastInvokeTime = 0,
          leading = false,
          maxing = false,
          trailing = true;

      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      wait = toNumber(wait) || 0;
      if (isObject(options)) {
        leading = !!options.leading;
        maxing = 'maxWait' in options;
        maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
        trailing = 'trailing' in options ? !!options.trailing : trailing;
      }

      function invokeFunc(time) {
        var args = lastArgs,
            thisArg = lastThis;

        lastArgs = lastThis = undefined;
        lastInvokeTime = time;
        result = func.apply(thisArg, args);
        return result;
      }

      function leadingEdge(time) {
        // Reset any `maxWait` timer.
        lastInvokeTime = time;
        // Start the timer for the trailing edge.
        timerId = setTimeout(timerExpired, wait);
        // Invoke the leading edge.
        return leading ? invokeFunc(time) : result;
      }

      function remainingWait(time) {
        var timeSinceLastCall = time - lastCallTime,
            timeSinceLastInvoke = time - lastInvokeTime,
            timeWaiting = wait - timeSinceLastCall;

        return maxing
          ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
          : timeWaiting;
      }

      function shouldInvoke(time) {
        var timeSinceLastCall = time - lastCallTime,
            timeSinceLastInvoke = time - lastInvokeTime;

        // Either this is the first call, activity has stopped and we're at the
        // trailing edge, the system time has gone backwards and we're treating
        // it as the trailing edge, or we've hit the `maxWait` limit.
        return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
          (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
      }

      function timerExpired() {
        var time = now();
        if (shouldInvoke(time)) {
          return trailingEdge(time);
        }
        // Restart the timer.
        timerId = setTimeout(timerExpired, remainingWait(time));
      }

      function trailingEdge(time) {
        timerId = undefined;

        // Only invoke if we have `lastArgs` which means `func` has been
        // debounced at least once.
        if (trailing && lastArgs) {
          return invokeFunc(time);
        }
        lastArgs = lastThis = undefined;
        return result;
      }

      function cancel() {
        if (timerId !== undefined) {
          clearTimeout(timerId);
        }
        lastInvokeTime = 0;
        lastArgs = lastCallTime = lastThis = timerId = undefined;
      }

      function flush() {
        return timerId === undefined ? result : trailingEdge(now());
      }

      function debounced() {
        var time = now(),
            isInvoking = shouldInvoke(time);

        lastArgs = arguments;
        lastThis = this;
        lastCallTime = time;

        if (isInvoking) {
          if (timerId === undefined) {
            return leadingEdge(lastCallTime);
          }
          if (maxing) {
            // Handle invocations in a tight loop.
            clearTimeout(timerId);
            timerId = setTimeout(timerExpired, wait);
            return invokeFunc(lastCallTime);
          }
        }
        if (timerId === undefined) {
          timerId = setTimeout(timerExpired, wait);
        }
        return result;
      }
      debounced.cancel = cancel;
      debounced.flush = flush;
      return debounced;
    }

    /**
     * Defers invoking the `func` until the current call stack has cleared. Any
     * additional arguments are provided to `func` when it's invoked.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to defer.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.defer(function(text) {
     *   console.log(text);
     * }, 'deferred');
     * // => Logs 'deferred' after one millisecond.
     */
    var defer = baseRest(function(func, args) {
      return baseDelay(func, 1, args);
    });

    /**
     * Invokes `func` after `wait` milliseconds. Any additional arguments are
     * provided to `func` when it's invoked.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to delay.
     * @param {number} wait The number of milliseconds to delay invocation.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {number} Returns the timer id.
     * @example
     *
     * _.delay(function(text) {
     *   console.log(text);
     * }, 1000, 'later');
     * // => Logs 'later' after one second.
     */
    var delay = baseRest(function(func, wait, args) {
      return baseDelay(func, toNumber(wait) || 0, args);
    });

    /**
     * Creates a function that invokes `func` with arguments reversed.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to flip arguments for.
     * @returns {Function} Returns the new flipped function.
     * @example
     *
     * var flipped = _.flip(function() {
     *   return _.toArray(arguments);
     * });
     *
     * flipped('a', 'b', 'c', 'd');
     * // => ['d', 'c', 'b', 'a']
     */
    function flip(func) {
      return createWrap(func, WRAP_FLIP_FLAG);
    }

    /**
     * Creates a function that memoizes the result of `func`. If `resolver` is
     * provided, it determines the cache key for storing the result based on the
     * arguments provided to the memoized function. By default, the first argument
     * provided to the memoized function is used as the map cache key. The `func`
     * is invoked with the `this` binding of the memoized function.
     *
     * **Note:** The cache is exposed as the `cache` property on the memoized
     * function. Its creation may be customized by replacing the `_.memoize.Cache`
     * constructor with one whose instances implement the
     * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
     * method interface of `clear`, `delete`, `get`, `has`, and `set`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to have its output memoized.
     * @param {Function} [resolver] The function to resolve the cache key.
     * @returns {Function} Returns the new memoized function.
     * @example
     *
     * var object = { 'a': 1, 'b': 2 };
     * var other = { 'c': 3, 'd': 4 };
     *
     * var values = _.memoize(_.values);
     * values(object);
     * // => [1, 2]
     *
     * values(other);
     * // => [3, 4]
     *
     * object.a = 2;
     * values(object);
     * // => [1, 2]
     *
     * // Modify the result cache.
     * values.cache.set(object, ['a', 'b']);
     * values(object);
     * // => ['a', 'b']
     *
     * // Replace `_.memoize.Cache`.
     * _.memoize.Cache = WeakMap;
     */
    function memoize(func, resolver) {
      if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      var memoized = function() {
        var args = arguments,
            key = resolver ? resolver.apply(this, args) : args[0],
            cache = memoized.cache;

        if (cache.has(key)) {
          return cache.get(key);
        }
        var result = func.apply(this, args);
        memoized.cache = cache.set(key, result) || cache;
        return result;
      };
      memoized.cache = new (memoize.Cache || MapCache);
      return memoized;
    }

    // Expose `MapCache`.
    memoize.Cache = MapCache;

    /**
     * Creates a function that negates the result of the predicate `func`. The
     * `func` predicate is invoked with the `this` binding and arguments of the
     * created function.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} predicate The predicate to negate.
     * @returns {Function} Returns the new negated function.
     * @example
     *
     * function isEven(n) {
     *   return n % 2 == 0;
     * }
     *
     * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
     * // => [1, 3, 5]
     */
    function negate(predicate) {
      if (typeof predicate != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      return function() {
        var args = arguments;
        switch (args.length) {
          case 0: return !predicate.call(this);
          case 1: return !predicate.call(this, args[0]);
          case 2: return !predicate.call(this, args[0], args[1]);
          case 3: return !predicate.call(this, args[0], args[1], args[2]);
        }
        return !predicate.apply(this, args);
      };
    }

    /**
     * Creates a function that is restricted to invoking `func` once. Repeat calls
     * to the function return the value of the first invocation. The `func` is
     * invoked with the `this` binding and arguments of the created function.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to restrict.
     * @returns {Function} Returns the new restricted function.
     * @example
     *
     * var initialize = _.once(createApplication);
     * initialize();
     * initialize();
     * // => `createApplication` is invoked once
     */
    function once(func) {
      return before(2, func);
    }

    /**
     * Creates a function that invokes `func` with its arguments transformed.
     *
     * @static
     * @since 4.0.0
     * @memberOf _
     * @category Function
     * @param {Function} func The function to wrap.
     * @param {...(Function|Function[])} [transforms=[_.identity]]
     *  The argument transforms.
     * @returns {Function} Returns the new function.
     * @example
     *
     * function doubled(n) {
     *   return n * 2;
     * }
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var func = _.overArgs(function(x, y) {
     *   return [x, y];
     * }, [square, doubled]);
     *
     * func(9, 3);
     * // => [81, 6]
     *
     * func(10, 5);
     * // => [100, 10]
     */
    var overArgs = castRest(function(func, transforms) {
      transforms = (transforms.length == 1 && isArray(transforms[0]))
        ? arrayMap(transforms[0], baseUnary(getIteratee()))
        : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));

      var funcsLength = transforms.length;
      return baseRest(function(args) {
        var index = -1,
            length = nativeMin(args.length, funcsLength);

        while (++index < length) {
          args[index] = transforms[index].call(this, args[index]);
        }
        return apply(func, this, args);
      });
    });

    /**
     * Creates a function that invokes `func` with `partials` prepended to the
     * arguments it receives. This method is like `_.bind` except it does **not**
     * alter the `this` binding.
     *
     * The `_.partial.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method doesn't set the "length" property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @since 0.2.0
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * function greet(greeting, name) {
     *   return greeting + ' ' + name;
     * }
     *
     * var sayHelloTo = _.partial(greet, 'hello');
     * sayHelloTo('fred');
     * // => 'hello fred'
     *
     * // Partially applied with placeholders.
     * var greetFred = _.partial(greet, _, 'fred');
     * greetFred('hi');
     * // => 'hi fred'
     */
    var partial = baseRest(function(func, partials) {
      var holders = replaceHolders(partials, getHolder(partial));
      return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
    });

    /**
     * This method is like `_.partial` except that partially applied arguments
     * are appended to the arguments it receives.
     *
     * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
     * builds, may be used as a placeholder for partially applied arguments.
     *
     * **Note:** This method doesn't set the "length" property of partially
     * applied functions.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Function
     * @param {Function} func The function to partially apply arguments to.
     * @param {...*} [partials] The arguments to be partially applied.
     * @returns {Function} Returns the new partially applied function.
     * @example
     *
     * function greet(greeting, name) {
     *   return greeting + ' ' + name;
     * }
     *
     * var greetFred = _.partialRight(greet, 'fred');
     * greetFred('hi');
     * // => 'hi fred'
     *
     * // Partially applied with placeholders.
     * var sayHelloTo = _.partialRight(greet, 'hello', _);
     * sayHelloTo('fred');
     * // => 'hello fred'
     */
    var partialRight = baseRest(function(func, partials) {
      var holders = replaceHolders(partials, getHolder(partialRight));
      return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
    });

    /**
     * Creates a function that invokes `func` with arguments arranged according
     * to the specified `indexes` where the argument value at the first index is
     * provided as the first argument, the argument value at the second index is
     * provided as the second argument, and so on.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Function
     * @param {Function} func The function to rearrange arguments for.
     * @param {...(number|number[])} indexes The arranged argument indexes.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var rearged = _.rearg(function(a, b, c) {
     *   return [a, b, c];
     * }, [2, 0, 1]);
     *
     * rearged('b', 'c', 'a')
     * // => ['a', 'b', 'c']
     */
    var rearg = flatRest(function(func, indexes) {
      return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
    });

    /**
     * Creates a function that invokes `func` with the `this` binding of the
     * created function and arguments from `start` and beyond provided as
     * an array.
     *
     * **Note:** This method is based on the
     * [rest parameter](https://mdn.io/rest_parameters).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to apply a rest parameter to.
     * @param {number} [start=func.length-1] The start position of the rest parameter.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.rest(function(what, names) {
     *   return what + ' ' + _.initial(names).join(', ') +
     *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
     * });
     *
     * say('hello', 'fred', 'barney', 'pebbles');
     * // => 'hello fred, barney, & pebbles'
     */
    function rest(func, start) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      start = start === undefined ? start : toInteger(start);
      return baseRest(func, start);
    }

    /**
     * Creates a function that invokes `func` with the `this` binding of the
     * create function and an array of arguments much like
     * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
     *
     * **Note:** This method is based on the
     * [spread operator](https://mdn.io/spread_operator).
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Function
     * @param {Function} func The function to spread arguments over.
     * @param {number} [start=0] The start position of the spread.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var say = _.spread(function(who, what) {
     *   return who + ' says ' + what;
     * });
     *
     * say(['fred', 'hello']);
     * // => 'fred says hello'
     *
     * var numbers = Promise.all([
     *   Promise.resolve(40),
     *   Promise.resolve(36)
     * ]);
     *
     * numbers.then(_.spread(function(x, y) {
     *   return x + y;
     * }));
     * // => a Promise of 76
     */
    function spread(func, start) {
      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      start = start == null ? 0 : nativeMax(toInteger(start), 0);
      return baseRest(function(args) {
        var array = args[start],
            otherArgs = castSlice(args, 0, start);

        if (array) {
          arrayPush(otherArgs, array);
        }
        return apply(func, this, otherArgs);
      });
    }

    /**
     * Creates a throttled function that only invokes `func` at most once per
     * every `wait` milliseconds. The throttled function comes with a `cancel`
     * method to cancel delayed `func` invocations and a `flush` method to
     * immediately invoke them. Provide `options` to indicate whether `func`
     * should be invoked on the leading and/or trailing edge of the `wait`
     * timeout. The `func` is invoked with the last arguments provided to the
     * throttled function. Subsequent calls to the throttled function return the
     * result of the last `func` invocation.
     *
     * **Note:** If `leading` and `trailing` options are `true`, `func` is
     * invoked on the trailing edge of the timeout only if the throttled function
     * is invoked more than once during the `wait` timeout.
     *
     * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
     * until to the next tick, similar to `setTimeout` with a timeout of `0`.
     *
     * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
     * for details over the differences between `_.throttle` and `_.debounce`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {Function} func The function to throttle.
     * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.leading=true]
     *  Specify invoking on the leading edge of the timeout.
     * @param {boolean} [options.trailing=true]
     *  Specify invoking on the trailing edge of the timeout.
     * @returns {Function} Returns the new throttled function.
     * @example
     *
     * // Avoid excessively updating the position while scrolling.
     * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
     *
     * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
     * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
     * jQuery(element).on('click', throttled);
     *
     * // Cancel the trailing throttled invocation.
     * jQuery(window).on('popstate', throttled.cancel);
     */
    function throttle(func, wait, options) {
      var leading = true,
          trailing = true;

      if (typeof func != 'function') {
        throw new TypeError(FUNC_ERROR_TEXT);
      }
      if (isObject(options)) {
        leading = 'leading' in options ? !!options.leading : leading;
        trailing = 'trailing' in options ? !!options.trailing : trailing;
      }
      return debounce(func, wait, {
        'leading': leading,
        'maxWait': wait,
        'trailing': trailing
      });
    }

    /**
     * Creates a function that accepts up to one argument, ignoring any
     * additional arguments.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Function
     * @param {Function} func The function to cap arguments for.
     * @returns {Function} Returns the new capped function.
     * @example
     *
     * _.map(['6', '8', '10'], _.unary(parseInt));
     * // => [6, 8, 10]
     */
    function unary(func) {
      return ary(func, 1);
    }

    /**
     * Creates a function that provides `value` to `wrapper` as its first
     * argument. Any additional arguments provided to the function are appended
     * to those provided to the `wrapper`. The wrapper is invoked with the `this`
     * binding of the created function.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Function
     * @param {*} value The value to wrap.
     * @param {Function} [wrapper=identity] The wrapper function.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var p = _.wrap(_.escape, function(func, text) {
     *   return '<p>' + func(text) + '</p>';
     * });
     *
     * p('fred, barney, & pebbles');
     * // => '<p>fred, barney, &amp; pebbles</p>'
     */
    function wrap(value, wrapper) {
      return partial(castFunction(wrapper), value);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Casts `value` as an array if it's not one.
     *
     * @static
     * @memberOf _
     * @since 4.4.0
     * @category Lang
     * @param {*} value The value to inspect.
     * @returns {Array} Returns the cast array.
     * @example
     *
     * _.castArray(1);
     * // => [1]
     *
     * _.castArray({ 'a': 1 });
     * // => [{ 'a': 1 }]
     *
     * _.castArray('abc');
     * // => ['abc']
     *
     * _.castArray(null);
     * // => [null]
     *
     * _.castArray(undefined);
     * // => [undefined]
     *
     * _.castArray();
     * // => []
     *
     * var array = [1, 2, 3];
     * console.log(_.castArray(array) === array);
     * // => true
     */
    function castArray() {
      if (!arguments.length) {
        return [];
      }
      var value = arguments[0];
      return isArray(value) ? value : [value];
    }

    /**
     * Creates a shallow clone of `value`.
     *
     * **Note:** This method is loosely based on the
     * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
     * and supports cloning arrays, array buffers, booleans, date objects, maps,
     * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
     * arrays. The own enumerable properties of `arguments` objects are cloned
     * as plain objects. An empty object is returned for uncloneable values such
     * as error objects, functions, DOM nodes, and WeakMaps.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to clone.
     * @returns {*} Returns the cloned value.
     * @see _.cloneDeep
     * @example
     *
     * var objects = [{ 'a': 1 }, { 'b': 2 }];
     *
     * var shallow = _.clone(objects);
     * console.log(shallow[0] === objects[0]);
     * // => true
     */
    function clone(value) {
      return baseClone(value, CLONE_SYMBOLS_FLAG);
    }

    /**
     * This method is like `_.clone` except that it accepts `customizer` which
     * is invoked to produce the cloned value. If `customizer` returns `undefined`,
     * cloning is handled by the method instead. The `customizer` is invoked with
     * up to four arguments; (value [, index|key, object, stack]).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to clone.
     * @param {Function} [customizer] The function to customize cloning.
     * @returns {*} Returns the cloned value.
     * @see _.cloneDeepWith
     * @example
     *
     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(false);
     *   }
     * }
     *
     * var el = _.cloneWith(document.body, customizer);
     *
     * console.log(el === document.body);
     * // => false
     * console.log(el.nodeName);
     * // => 'BODY'
     * console.log(el.childNodes.length);
     * // => 0
     */
    function cloneWith(value, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
    }

    /**
     * This method is like `_.clone` except that it recursively clones `value`.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Lang
     * @param {*} value The value to recursively clone.
     * @returns {*} Returns the deep cloned value.
     * @see _.clone
     * @example
     *
     * var objects = [{ 'a': 1 }, { 'b': 2 }];
     *
     * var deep = _.cloneDeep(objects);
     * console.log(deep[0] === objects[0]);
     * // => false
     */
    function cloneDeep(value) {
      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
    }

    /**
     * This method is like `_.cloneWith` except that it recursively clones `value`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to recursively clone.
     * @param {Function} [customizer] The function to customize cloning.
     * @returns {*} Returns the deep cloned value.
     * @see _.cloneWith
     * @example
     *
     * function customizer(value) {
     *   if (_.isElement(value)) {
     *     return value.cloneNode(true);
     *   }
     * }
     *
     * var el = _.cloneDeepWith(document.body, customizer);
     *
     * console.log(el === document.body);
     * // => false
     * console.log(el.nodeName);
     * // => 'BODY'
     * console.log(el.childNodes.length);
     * // => 20
     */
    function cloneDeepWith(value, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
    }

    /**
     * Checks if `object` conforms to `source` by invoking the predicate
     * properties of `source` with the corresponding property values of `object`.
     *
     * **Note:** This method is equivalent to `_.conforms` when `source` is
     * partially applied.
     *
     * @static
     * @memberOf _
     * @since 4.14.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property predicates to conform to.
     * @returns {boolean} Returns `true` if `object` conforms, else `false`.
     * @example
     *
     * var object = { 'a': 1, 'b': 2 };
     *
     * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
     * // => true
     *
     * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
     * // => false
     */
    function conformsTo(object, source) {
      return source == null || baseConformsTo(object, source, keys(source));
    }

    /**
     * Performs a
     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
     * comparison between two values to determine if they are equivalent.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { 'a': 1 };
     * var other = { 'a': 1 };
     *
     * _.eq(object, object);
     * // => true
     *
     * _.eq(object, other);
     * // => false
     *
     * _.eq('a', 'a');
     * // => true
     *
     * _.eq('a', Object('a'));
     * // => false
     *
     * _.eq(NaN, NaN);
     * // => true
     */
    function eq(value, other) {
      return value === other || (value !== value && other !== other);
    }

    /**
     * Checks if `value` is greater than `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than `other`,
     *  else `false`.
     * @see _.lt
     * @example
     *
     * _.gt(3, 1);
     * // => true
     *
     * _.gt(3, 3);
     * // => false
     *
     * _.gt(1, 3);
     * // => false
     */
    var gt = createRelationalOperation(baseGt);

    /**
     * Checks if `value` is greater than or equal to `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is greater than or equal to
     *  `other`, else `false`.
     * @see _.lte
     * @example
     *
     * _.gte(3, 1);
     * // => true
     *
     * _.gte(3, 3);
     * // => true
     *
     * _.gte(1, 3);
     * // => false
     */
    var gte = createRelationalOperation(function(value, other) {
      return value >= other;
    });

    /**
     * Checks if `value` is likely an `arguments` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an `arguments` object,
     *  else `false`.
     * @example
     *
     * _.isArguments(function() { return arguments; }());
     * // => true
     *
     * _.isArguments([1, 2, 3]);
     * // => false
     */
    var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
      return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
        !propertyIsEnumerable.call(value, 'callee');
    };

    /**
     * Checks if `value` is classified as an `Array` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array, else `false`.
     * @example
     *
     * _.isArray([1, 2, 3]);
     * // => true
     *
     * _.isArray(document.body.children);
     * // => false
     *
     * _.isArray('abc');
     * // => false
     *
     * _.isArray(_.noop);
     * // => false
     */
    var isArray = Array.isArray;

    /**
     * Checks if `value` is classified as an `ArrayBuffer` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
     * @example
     *
     * _.isArrayBuffer(new ArrayBuffer(2));
     * // => true
     *
     * _.isArrayBuffer(new Array(2));
     * // => false
     */
    var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;

    /**
     * Checks if `value` is array-like. A value is considered array-like if it's
     * not a function and has a `value.length` that's an integer greater than or
     * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
     * @example
     *
     * _.isArrayLike([1, 2, 3]);
     * // => true
     *
     * _.isArrayLike(document.body.children);
     * // => true
     *
     * _.isArrayLike('abc');
     * // => true
     *
     * _.isArrayLike(_.noop);
     * // => false
     */
    function isArrayLike(value) {
      return value != null && isLength(value.length) && !isFunction(value);
    }

    /**
     * This method is like `_.isArrayLike` except that it also checks if `value`
     * is an object.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an array-like object,
     *  else `false`.
     * @example
     *
     * _.isArrayLikeObject([1, 2, 3]);
     * // => true
     *
     * _.isArrayLikeObject(document.body.children);
     * // => true
     *
     * _.isArrayLikeObject('abc');
     * // => false
     *
     * _.isArrayLikeObject(_.noop);
     * // => false
     */
    function isArrayLikeObject(value) {
      return isObjectLike(value) && isArrayLike(value);
    }

    /**
     * Checks if `value` is classified as a boolean primitive or object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
     * @example
     *
     * _.isBoolean(false);
     * // => true
     *
     * _.isBoolean(null);
     * // => false
     */
    function isBoolean(value) {
      return value === true || value === false ||
        (isObjectLike(value) && baseGetTag(value) == boolTag);
    }

    /**
     * Checks if `value` is a buffer.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
     * @example
     *
     * _.isBuffer(new Buffer(2));
     * // => true
     *
     * _.isBuffer(new Uint8Array(2));
     * // => false
     */
    var isBuffer = nativeIsBuffer || stubFalse;

    /**
     * Checks if `value` is classified as a `Date` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
     * @example
     *
     * _.isDate(new Date);
     * // => true
     *
     * _.isDate('Mon April 23 2012');
     * // => false
     */
    var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;

    /**
     * Checks if `value` is likely a DOM element.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
     * @example
     *
     * _.isElement(document.body);
     * // => true
     *
     * _.isElement('<body>');
     * // => false
     */
    function isElement(value) {
      return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
    }

    /**
     * Checks if `value` is an empty object, collection, map, or set.
     *
     * Objects are considered empty if they have no own enumerable string keyed
     * properties.
     *
     * Array-like values such as `arguments` objects, arrays, buffers, strings, or
     * jQuery-like collections are considered empty if they have a `length` of `0`.
     * Similarly, maps and sets are considered empty if they have a `size` of `0`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is empty, else `false`.
     * @example
     *
     * _.isEmpty(null);
     * // => true
     *
     * _.isEmpty(true);
     * // => true
     *
     * _.isEmpty(1);
     * // => true
     *
     * _.isEmpty([1, 2, 3]);
     * // => false
     *
     * _.isEmpty({ 'a': 1 });
     * // => false
     */
    function isEmpty(value) {
      if (value == null) {
        return true;
      }
      if (isArrayLike(value) &&
          (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
            isBuffer(value) || isTypedArray(value) || isArguments(value))) {
        return !value.length;
      }
      var tag = getTag(value);
      if (tag == mapTag || tag == setTag) {
        return !value.size;
      }
      if (isPrototype(value)) {
        return !baseKeys(value).length;
      }
      for (var key in value) {
        if (hasOwnProperty.call(value, key)) {
          return false;
        }
      }
      return true;
    }

    /**
     * Performs a deep comparison between two values to determine if they are
     * equivalent.
     *
     * **Note:** This method supports comparing arrays, array buffers, booleans,
     * date objects, error objects, maps, numbers, `Object` objects, regexes,
     * sets, strings, symbols, and typed arrays. `Object` objects are compared
     * by their own, not inherited, enumerable properties. Functions and DOM
     * nodes are compared by strict equality, i.e. `===`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * var object = { 'a': 1 };
     * var other = { 'a': 1 };
     *
     * _.isEqual(object, other);
     * // => true
     *
     * object === other;
     * // => false
     */
    function isEqual(value, other) {
      return baseIsEqual(value, other);
    }

    /**
     * This method is like `_.isEqual` except that it accepts `customizer` which
     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
     * are handled by the method instead. The `customizer` is invoked with up to
     * six arguments: (objValue, othValue [, index|key, object, other, stack]).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
     * @example
     *
     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
     *
     * function customizer(objValue, othValue) {
     *   if (isGreeting(objValue) && isGreeting(othValue)) {
     *     return true;
     *   }
     * }
     *
     * var array = ['hello', 'goodbye'];
     * var other = ['hi', 'goodbye'];
     *
     * _.isEqualWith(array, other, customizer);
     * // => true
     */
    function isEqualWith(value, other, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      var result = customizer ? customizer(value, other) : undefined;
      return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
    }

    /**
     * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
     * `SyntaxError`, `TypeError`, or `URIError` object.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
     * @example
     *
     * _.isError(new Error);
     * // => true
     *
     * _.isError(Error);
     * // => false
     */
    function isError(value) {
      if (!isObjectLike(value)) {
        return false;
      }
      var tag = baseGetTag(value);
      return tag == errorTag || tag == domExcTag ||
        (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
    }

    /**
     * Checks if `value` is a finite primitive number.
     *
     * **Note:** This method is based on
     * [`Number.isFinite`](https://mdn.io/Number/isFinite).
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
     * @example
     *
     * _.isFinite(3);
     * // => true
     *
     * _.isFinite(Number.MIN_VALUE);
     * // => true
     *
     * _.isFinite(Infinity);
     * // => false
     *
     * _.isFinite('3');
     * // => false
     */
    function isFinite(value) {
      return typeof value == 'number' && nativeIsFinite(value);
    }

    /**
     * Checks if `value` is classified as a `Function` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a function, else `false`.
     * @example
     *
     * _.isFunction(_);
     * // => true
     *
     * _.isFunction(/abc/);
     * // => false
     */
    function isFunction(value) {
      if (!isObject(value)) {
        return false;
      }
      // The use of `Object#toString` avoids issues with the `typeof` operator
      // in Safari 9 which returns 'object' for typed arrays and other constructors.
      var tag = baseGetTag(value);
      return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
    }

    /**
     * Checks if `value` is an integer.
     *
     * **Note:** This method is based on
     * [`Number.isInteger`](https://mdn.io/Number/isInteger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
     * @example
     *
     * _.isInteger(3);
     * // => true
     *
     * _.isInteger(Number.MIN_VALUE);
     * // => false
     *
     * _.isInteger(Infinity);
     * // => false
     *
     * _.isInteger('3');
     * // => false
     */
    function isInteger(value) {
      return typeof value == 'number' && value == toInteger(value);
    }

    /**
     * Checks if `value` is a valid array-like length.
     *
     * **Note:** This method is loosely based on
     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
     * @example
     *
     * _.isLength(3);
     * // => true
     *
     * _.isLength(Number.MIN_VALUE);
     * // => false
     *
     * _.isLength(Infinity);
     * // => false
     *
     * _.isLength('3');
     * // => false
     */
    function isLength(value) {
      return typeof value == 'number' &&
        value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
    }

    /**
     * Checks if `value` is the
     * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
     * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is an object, else `false`.
     * @example
     *
     * _.isObject({});
     * // => true
     *
     * _.isObject([1, 2, 3]);
     * // => true
     *
     * _.isObject(_.noop);
     * // => true
     *
     * _.isObject(null);
     * // => false
     */
    function isObject(value) {
      var type = typeof value;
      return value != null && (type == 'object' || type == 'function');
    }

    /**
     * Checks if `value` is object-like. A value is object-like if it's not `null`
     * and has a `typeof` result of "object".
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
     * @example
     *
     * _.isObjectLike({});
     * // => true
     *
     * _.isObjectLike([1, 2, 3]);
     * // => true
     *
     * _.isObjectLike(_.noop);
     * // => false
     *
     * _.isObjectLike(null);
     * // => false
     */
    function isObjectLike(value) {
      return value != null && typeof value == 'object';
    }

    /**
     * Checks if `value` is classified as a `Map` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a map, else `false`.
     * @example
     *
     * _.isMap(new Map);
     * // => true
     *
     * _.isMap(new WeakMap);
     * // => false
     */
    var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;

    /**
     * Performs a partial deep comparison between `object` and `source` to
     * determine if `object` contains equivalent property values.
     *
     * **Note:** This method is equivalent to `_.matches` when `source` is
     * partially applied.
     *
     * Partial comparisons will match empty array and empty object `source`
     * values against any array or object value, respectively. See `_.isEqual`
     * for a list of supported value comparisons.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     * @example
     *
     * var object = { 'a': 1, 'b': 2 };
     *
     * _.isMatch(object, { 'b': 2 });
     * // => true
     *
     * _.isMatch(object, { 'b': 1 });
     * // => false
     */
    function isMatch(object, source) {
      return object === source || baseIsMatch(object, source, getMatchData(source));
    }

    /**
     * This method is like `_.isMatch` except that it accepts `customizer` which
     * is invoked to compare values. If `customizer` returns `undefined`, comparisons
     * are handled by the method instead. The `customizer` is invoked with five
     * arguments: (objValue, srcValue, index|key, object, source).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {Object} object The object to inspect.
     * @param {Object} source The object of property values to match.
     * @param {Function} [customizer] The function to customize comparisons.
     * @returns {boolean} Returns `true` if `object` is a match, else `false`.
     * @example
     *
     * function isGreeting(value) {
     *   return /^h(?:i|ello)$/.test(value);
     * }
     *
     * function customizer(objValue, srcValue) {
     *   if (isGreeting(objValue) && isGreeting(srcValue)) {
     *     return true;
     *   }
     * }
     *
     * var object = { 'greeting': 'hello' };
     * var source = { 'greeting': 'hi' };
     *
     * _.isMatchWith(object, source, customizer);
     * // => true
     */
    function isMatchWith(object, source, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      return baseIsMatch(object, source, getMatchData(source), customizer);
    }

    /**
     * Checks if `value` is `NaN`.
     *
     * **Note:** This method is based on
     * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
     * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
     * `undefined` and other non-number values.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
     * @example
     *
     * _.isNaN(NaN);
     * // => true
     *
     * _.isNaN(new Number(NaN));
     * // => true
     *
     * isNaN(undefined);
     * // => true
     *
     * _.isNaN(undefined);
     * // => false
     */
    function isNaN(value) {
      // An `NaN` primitive is the only value that is not equal to itself.
      // Perform the `toStringTag` check first to avoid errors with some
      // ActiveX objects in IE.
      return isNumber(value) && value != +value;
    }

    /**
     * Checks if `value` is a pristine native function.
     *
     * **Note:** This method can't reliably detect native functions in the presence
     * of the core-js package because core-js circumvents this kind of detection.
     * Despite multiple requests, the core-js maintainer has made it clear: any
     * attempt to fix the detection will be obstructed. As a result, we're left
     * with little choice but to throw an error. Unfortunately, this also affects
     * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
     * which rely on core-js.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a native function,
     *  else `false`.
     * @example
     *
     * _.isNative(Array.prototype.push);
     * // => true
     *
     * _.isNative(_);
     * // => false
     */
    function isNative(value) {
      if (isMaskable(value)) {
        throw new Error(CORE_ERROR_TEXT);
      }
      return baseIsNative(value);
    }

    /**
     * Checks if `value` is `null`.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
     * @example
     *
     * _.isNull(null);
     * // => true
     *
     * _.isNull(void 0);
     * // => false
     */
    function isNull(value) {
      return value === null;
    }

    /**
     * Checks if `value` is `null` or `undefined`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
     * @example
     *
     * _.isNil(null);
     * // => true
     *
     * _.isNil(void 0);
     * // => true
     *
     * _.isNil(NaN);
     * // => false
     */
    function isNil(value) {
      return value == null;
    }

    /**
     * Checks if `value` is classified as a `Number` primitive or object.
     *
     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
     * classified as numbers, use the `_.isFinite` method.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a number, else `false`.
     * @example
     *
     * _.isNumber(3);
     * // => true
     *
     * _.isNumber(Number.MIN_VALUE);
     * // => true
     *
     * _.isNumber(Infinity);
     * // => true
     *
     * _.isNumber('3');
     * // => false
     */
    function isNumber(value) {
      return typeof value == 'number' ||
        (isObjectLike(value) && baseGetTag(value) == numberTag);
    }

    /**
     * Checks if `value` is a plain object, that is, an object created by the
     * `Object` constructor or one with a `[[Prototype]]` of `null`.
     *
     * @static
     * @memberOf _
     * @since 0.8.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * _.isPlainObject(new Foo);
     * // => false
     *
     * _.isPlainObject([1, 2, 3]);
     * // => false
     *
     * _.isPlainObject({ 'x': 0, 'y': 0 });
     * // => true
     *
     * _.isPlainObject(Object.create(null));
     * // => true
     */
    function isPlainObject(value) {
      if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
        return false;
      }
      var proto = getPrototype(value);
      if (proto === null) {
        return true;
      }
      var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
      return typeof Ctor == 'function' && Ctor instanceof Ctor &&
        funcToString.call(Ctor) == objectCtorString;
    }

    /**
     * Checks if `value` is classified as a `RegExp` object.
     *
     * @static
     * @memberOf _
     * @since 0.1.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
     * @example
     *
     * _.isRegExp(/abc/);
     * // => true
     *
     * _.isRegExp('/abc/');
     * // => false
     */
    var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;

    /**
     * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
     * double precision number which isn't the result of a rounded unsafe integer.
     *
     * **Note:** This method is based on
     * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
     * @example
     *
     * _.isSafeInteger(3);
     * // => true
     *
     * _.isSafeInteger(Number.MIN_VALUE);
     * // => false
     *
     * _.isSafeInteger(Infinity);
     * // => false
     *
     * _.isSafeInteger('3');
     * // => false
     */
    function isSafeInteger(value) {
      return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
    }

    /**
     * Checks if `value` is classified as a `Set` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a set, else `false`.
     * @example
     *
     * _.isSet(new Set);
     * // => true
     *
     * _.isSet(new WeakSet);
     * // => false
     */
    var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;

    /**
     * Checks if `value` is classified as a `String` primitive or object.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a string, else `false`.
     * @example
     *
     * _.isString('abc');
     * // => true
     *
     * _.isString(1);
     * // => false
     */
    function isString(value) {
      return typeof value == 'string' ||
        (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
    }

    /**
     * Checks if `value` is classified as a `Symbol` primitive or object.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
     * @example
     *
     * _.isSymbol(Symbol.iterator);
     * // => true
     *
     * _.isSymbol('abc');
     * // => false
     */
    function isSymbol(value) {
      return typeof value == 'symbol' ||
        (isObjectLike(value) && baseGetTag(value) == symbolTag);
    }

    /**
     * Checks if `value` is classified as a typed array.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
     * @example
     *
     * _.isTypedArray(new Uint8Array);
     * // => true
     *
     * _.isTypedArray([]);
     * // => false
     */
    var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;

    /**
     * Checks if `value` is `undefined`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
     * @example
     *
     * _.isUndefined(void 0);
     * // => true
     *
     * _.isUndefined(null);
     * // => false
     */
    function isUndefined(value) {
      return value === undefined;
    }

    /**
     * Checks if `value` is classified as a `WeakMap` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
     * @example
     *
     * _.isWeakMap(new WeakMap);
     * // => true
     *
     * _.isWeakMap(new Map);
     * // => false
     */
    function isWeakMap(value) {
      return isObjectLike(value) && getTag(value) == weakMapTag;
    }

    /**
     * Checks if `value` is classified as a `WeakSet` object.
     *
     * @static
     * @memberOf _
     * @since 4.3.0
     * @category Lang
     * @param {*} value The value to check.
     * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
     * @example
     *
     * _.isWeakSet(new WeakSet);
     * // => true
     *
     * _.isWeakSet(new Set);
     * // => false
     */
    function isWeakSet(value) {
      return isObjectLike(value) && baseGetTag(value) == weakSetTag;
    }

    /**
     * Checks if `value` is less than `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than `other`,
     *  else `false`.
     * @see _.gt
     * @example
     *
     * _.lt(1, 3);
     * // => true
     *
     * _.lt(3, 3);
     * // => false
     *
     * _.lt(3, 1);
     * // => false
     */
    var lt = createRelationalOperation(baseLt);

    /**
     * Checks if `value` is less than or equal to `other`.
     *
     * @static
     * @memberOf _
     * @since 3.9.0
     * @category Lang
     * @param {*} value The value to compare.
     * @param {*} other The other value to compare.
     * @returns {boolean} Returns `true` if `value` is less than or equal to
     *  `other`, else `false`.
     * @see _.gte
     * @example
     *
     * _.lte(1, 3);
     * // => true
     *
     * _.lte(3, 3);
     * // => true
     *
     * _.lte(3, 1);
     * // => false
     */
    var lte = createRelationalOperation(function(value, other) {
      return value <= other;
    });

    /**
     * Converts `value` to an array.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Array} Returns the converted array.
     * @example
     *
     * _.toArray({ 'a': 1, 'b': 2 });
     * // => [1, 2]
     *
     * _.toArray('abc');
     * // => ['a', 'b', 'c']
     *
     * _.toArray(1);
     * // => []
     *
     * _.toArray(null);
     * // => []
     */
    function toArray(value) {
      if (!value) {
        return [];
      }
      if (isArrayLike(value)) {
        return isString(value) ? stringToArray(value) : copyArray(value);
      }
      if (symIterator && value[symIterator]) {
        return iteratorToArray(value[symIterator]());
      }
      var tag = getTag(value),
          func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);

      return func(value);
    }

    /**
     * Converts `value` to a finite number.
     *
     * @static
     * @memberOf _
     * @since 4.12.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted number.
     * @example
     *
     * _.toFinite(3.2);
     * // => 3.2
     *
     * _.toFinite(Number.MIN_VALUE);
     * // => 5e-324
     *
     * _.toFinite(Infinity);
     * // => 1.7976931348623157e+308
     *
     * _.toFinite('3.2');
     * // => 3.2
     */
    function toFinite(value) {
      if (!value) {
        return value === 0 ? value : 0;
      }
      value = toNumber(value);
      if (value === INFINITY || value === -INFINITY) {
        var sign = (value < 0 ? -1 : 1);
        return sign * MAX_INTEGER;
      }
      return value === value ? value : 0;
    }

    /**
     * Converts `value` to an integer.
     *
     * **Note:** This method is loosely based on
     * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toInteger(3.2);
     * // => 3
     *
     * _.toInteger(Number.MIN_VALUE);
     * // => 0
     *
     * _.toInteger(Infinity);
     * // => 1.7976931348623157e+308
     *
     * _.toInteger('3.2');
     * // => 3
     */
    function toInteger(value) {
      var result = toFinite(value),
          remainder = result % 1;

      return result === result ? (remainder ? result - remainder : result) : 0;
    }

    /**
     * Converts `value` to an integer suitable for use as the length of an
     * array-like object.
     *
     * **Note:** This method is based on
     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toLength(3.2);
     * // => 3
     *
     * _.toLength(Number.MIN_VALUE);
     * // => 0
     *
     * _.toLength(Infinity);
     * // => 4294967295
     *
     * _.toLength('3.2');
     * // => 3
     */
    function toLength(value) {
      return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
    }

    /**
     * Converts `value` to a number.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to process.
     * @returns {number} Returns the number.
     * @example
     *
     * _.toNumber(3.2);
     * // => 3.2
     *
     * _.toNumber(Number.MIN_VALUE);
     * // => 5e-324
     *
     * _.toNumber(Infinity);
     * // => Infinity
     *
     * _.toNumber('3.2');
     * // => 3.2
     */
    function toNumber(value) {
      if (typeof value == 'number') {
        return value;
      }
      if (isSymbol(value)) {
        return NAN;
      }
      if (isObject(value)) {
        var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
        value = isObject(other) ? (other + '') : other;
      }
      if (typeof value != 'string') {
        return value === 0 ? value : +value;
      }
      value = baseTrim(value);
      var isBinary = reIsBinary.test(value);
      return (isBinary || reIsOctal.test(value))
        ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
        : (reIsBadHex.test(value) ? NAN : +value);
    }

    /**
     * Converts `value` to a plain object flattening inherited enumerable string
     * keyed properties of `value` to own properties of the plain object.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {Object} Returns the converted plain object.
     * @example
     *
     * function Foo() {
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.assign({ 'a': 1 }, new Foo);
     * // => { 'a': 1, 'b': 2 }
     *
     * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
     * // => { 'a': 1, 'b': 2, 'c': 3 }
     */
    function toPlainObject(value) {
      return copyObject(value, keysIn(value));
    }

    /**
     * Converts `value` to a safe integer. A safe integer can be compared and
     * represented correctly.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.toSafeInteger(3.2);
     * // => 3
     *
     * _.toSafeInteger(Number.MIN_VALUE);
     * // => 0
     *
     * _.toSafeInteger(Infinity);
     * // => 9007199254740991
     *
     * _.toSafeInteger('3.2');
     * // => 3
     */
    function toSafeInteger(value) {
      return value
        ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
        : (value === 0 ? value : 0);
    }

    /**
     * Converts `value` to a string. An empty string is returned for `null`
     * and `undefined` values. The sign of `-0` is preserved.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Lang
     * @param {*} value The value to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.toString(null);
     * // => ''
     *
     * _.toString(-0);
     * // => '-0'
     *
     * _.toString([1, 2, 3]);
     * // => '1,2,3'
     */
    function toString(value) {
      return value == null ? '' : baseToString(value);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Assigns own enumerable string keyed properties of source objects to the
     * destination object. Source objects are applied from left to right.
     * Subsequent sources overwrite property assignments of previous sources.
     *
     * **Note:** This method mutates `object` and is loosely based on
     * [`Object.assign`](https://mdn.io/Object/assign).
     *
     * @static
     * @memberOf _
     * @since 0.10.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.assignIn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * function Bar() {
     *   this.c = 3;
     * }
     *
     * Foo.prototype.b = 2;
     * Bar.prototype.d = 4;
     *
     * _.assign({ 'a': 0 }, new Foo, new Bar);
     * // => { 'a': 1, 'c': 3 }
     */
    var assign = createAssigner(function(object, source) {
      if (isPrototype(source) || isArrayLike(source)) {
        copyObject(source, keys(source), object);
        return;
      }
      for (var key in source) {
        if (hasOwnProperty.call(source, key)) {
          assignValue(object, key, source[key]);
        }
      }
    });

    /**
     * This method is like `_.assign` except that it iterates over own and
     * inherited source properties.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias extend
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.assign
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     * }
     *
     * function Bar() {
     *   this.c = 3;
     * }
     *
     * Foo.prototype.b = 2;
     * Bar.prototype.d = 4;
     *
     * _.assignIn({ 'a': 0 }, new Foo, new Bar);
     * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
     */
    var assignIn = createAssigner(function(object, source) {
      copyObject(source, keysIn(source), object);
    });

    /**
     * This method is like `_.assignIn` except that it accepts `customizer`
     * which is invoked to produce the assigned values. If `customizer` returns
     * `undefined`, assignment is handled by the method instead. The `customizer`
     * is invoked with five arguments: (objValue, srcValue, key, object, source).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias extendWith
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @see _.assignWith
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
     *
     * var defaults = _.partialRight(_.assignInWith, customizer);
     *
     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
     * // => { 'a': 1, 'b': 2 }
     */
    var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
      copyObject(source, keysIn(source), object, customizer);
    });

    /**
     * This method is like `_.assign` except that it accepts `customizer`
     * which is invoked to produce the assigned values. If `customizer` returns
     * `undefined`, assignment is handled by the method instead. The `customizer`
     * is invoked with five arguments: (objValue, srcValue, key, object, source).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @see _.assignInWith
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   return _.isUndefined(objValue) ? srcValue : objValue;
     * }
     *
     * var defaults = _.partialRight(_.assignWith, customizer);
     *
     * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
     * // => { 'a': 1, 'b': 2 }
     */
    var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
      copyObject(source, keys(source), object, customizer);
    });

    /**
     * Creates an array of values corresponding to `paths` of `object`.
     *
     * @static
     * @memberOf _
     * @since 1.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Array} Returns the picked values.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
     *
     * _.at(object, ['a[0].b.c', 'a[1]']);
     * // => [3, 4]
     */
    var at = flatRest(baseAt);

    /**
     * Creates an object that inherits from the `prototype` object. If a
     * `properties` object is given, its own enumerable string keyed properties
     * are assigned to the created object.
     *
     * @static
     * @memberOf _
     * @since 2.3.0
     * @category Object
     * @param {Object} prototype The object to inherit from.
     * @param {Object} [properties] The properties to assign to the object.
     * @returns {Object} Returns the new object.
     * @example
     *
     * function Shape() {
     *   this.x = 0;
     *   this.y = 0;
     * }
     *
     * function Circle() {
     *   Shape.call(this);
     * }
     *
     * Circle.prototype = _.create(Shape.prototype, {
     *   'constructor': Circle
     * });
     *
     * var circle = new Circle;
     * circle instanceof Circle;
     * // => true
     *
     * circle instanceof Shape;
     * // => true
     */
    function create(prototype, properties) {
      var result = baseCreate(prototype);
      return properties == null ? result : baseAssign(result, properties);
    }

    /**
     * Assigns own and inherited enumerable string keyed properties of source
     * objects to the destination object for all destination properties that
     * resolve to `undefined`. Source objects are applied from left to right.
     * Once a property is set, additional values of the same property are ignored.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.defaultsDeep
     * @example
     *
     * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
     * // => { 'a': 1, 'b': 2 }
     */
    var defaults = baseRest(function(object, sources) {
      object = Object(object);

      var index = -1;
      var length = sources.length;
      var guard = length > 2 ? sources[2] : undefined;

      if (guard && isIterateeCall(sources[0], sources[1], guard)) {
        length = 1;
      }

      while (++index < length) {
        var source = sources[index];
        var props = keysIn(source);
        var propsIndex = -1;
        var propsLength = props.length;

        while (++propsIndex < propsLength) {
          var key = props[propsIndex];
          var value = object[key];

          if (value === undefined ||
              (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
            object[key] = source[key];
          }
        }
      }

      return object;
    });

    /**
     * This method is like `_.defaults` except that it recursively assigns
     * default properties.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @see _.defaults
     * @example
     *
     * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
     * // => { 'a': { 'b': 2, 'c': 3 } }
     */
    var defaultsDeep = baseRest(function(args) {
      args.push(undefined, customDefaultsMerge);
      return apply(mergeWith, undefined, args);
    });

    /**
     * This method is like `_.find` except that it returns the key of the first
     * element `predicate` returns truthy for instead of the element itself.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {string|undefined} Returns the key of the matched element,
     *  else `undefined`.
     * @example
     *
     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
     *
     * _.findKey(users, function(o) { return o.age < 40; });
     * // => 'barney' (iteration order is not guaranteed)
     *
     * // The `_.matches` iteratee shorthand.
     * _.findKey(users, { 'age': 1, 'active': true });
     * // => 'pebbles'
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findKey(users, ['active', false]);
     * // => 'fred'
     *
     * // The `_.property` iteratee shorthand.
     * _.findKey(users, 'active');
     * // => 'barney'
     */
    function findKey(object, predicate) {
      return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
    }

    /**
     * This method is like `_.findKey` except that it iterates over elements of
     * a collection in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @param {Function} [predicate=_.identity] The function invoked per iteration.
     * @returns {string|undefined} Returns the key of the matched element,
     *  else `undefined`.
     * @example
     *
     * var users = {
     *   'barney':  { 'age': 36, 'active': true },
     *   'fred':    { 'age': 40, 'active': false },
     *   'pebbles': { 'age': 1,  'active': true }
     * };
     *
     * _.findLastKey(users, function(o) { return o.age < 40; });
     * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
     *
     * // The `_.matches` iteratee shorthand.
     * _.findLastKey(users, { 'age': 36, 'active': true });
     * // => 'barney'
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.findLastKey(users, ['active', false]);
     * // => 'fred'
     *
     * // The `_.property` iteratee shorthand.
     * _.findLastKey(users, 'active');
     * // => 'pebbles'
     */
    function findLastKey(object, predicate) {
      return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
    }

    /**
     * Iterates over own and inherited enumerable string keyed properties of an
     * object and invokes `iteratee` for each property. The iteratee is invoked
     * with three arguments: (value, key, object). Iteratee functions may exit
     * iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 0.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forInRight
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forIn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
     */
    function forIn(object, iteratee) {
      return object == null
        ? object
        : baseFor(object, getIteratee(iteratee, 3), keysIn);
    }

    /**
     * This method is like `_.forIn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forIn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forInRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
     */
    function forInRight(object, iteratee) {
      return object == null
        ? object
        : baseForRight(object, getIteratee(iteratee, 3), keysIn);
    }

    /**
     * Iterates over own enumerable string keyed properties of an object and
     * invokes `iteratee` for each property. The iteratee is invoked with three
     * arguments: (value, key, object). Iteratee functions may exit iteration
     * early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 0.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forOwnRight
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwn(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => Logs 'a' then 'b' (iteration order is not guaranteed).
     */
    function forOwn(object, iteratee) {
      return object && baseForOwn(object, getIteratee(iteratee, 3));
    }

    /**
     * This method is like `_.forOwn` except that it iterates over properties of
     * `object` in the opposite order.
     *
     * @static
     * @memberOf _
     * @since 2.0.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns `object`.
     * @see _.forOwn
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.forOwnRight(new Foo, function(value, key) {
     *   console.log(key);
     * });
     * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
     */
    function forOwnRight(object, iteratee) {
      return object && baseForOwnRight(object, getIteratee(iteratee, 3));
    }

    /**
     * Creates an array of function property names from own enumerable properties
     * of `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns the function names.
     * @see _.functionsIn
     * @example
     *
     * function Foo() {
     *   this.a = _.constant('a');
     *   this.b = _.constant('b');
     * }
     *
     * Foo.prototype.c = _.constant('c');
     *
     * _.functions(new Foo);
     * // => ['a', 'b']
     */
    function functions(object) {
      return object == null ? [] : baseFunctions(object, keys(object));
    }

    /**
     * Creates an array of function property names from own and inherited
     * enumerable properties of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to inspect.
     * @returns {Array} Returns the function names.
     * @see _.functions
     * @example
     *
     * function Foo() {
     *   this.a = _.constant('a');
     *   this.b = _.constant('b');
     * }
     *
     * Foo.prototype.c = _.constant('c');
     *
     * _.functionsIn(new Foo);
     * // => ['a', 'b', 'c']
     */
    function functionsIn(object) {
      return object == null ? [] : baseFunctions(object, keysIn(object));
    }

    /**
     * Gets the value at `path` of `object`. If the resolved value is
     * `undefined`, the `defaultValue` is returned in its place.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to get.
     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.get(object, 'a[0].b.c');
     * // => 3
     *
     * _.get(object, ['a', '0', 'b', 'c']);
     * // => 3
     *
     * _.get(object, 'a.b.c', 'default');
     * // => 'default'
     */
    function get(object, path, defaultValue) {
      var result = object == null ? undefined : baseGet(object, path);
      return result === undefined ? defaultValue : result;
    }

    /**
     * Checks if `path` is a direct property of `object`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     * @example
     *
     * var object = { 'a': { 'b': 2 } };
     * var other = _.create({ 'a': _.create({ 'b': 2 }) });
     *
     * _.has(object, 'a');
     * // => true
     *
     * _.has(object, 'a.b');
     * // => true
     *
     * _.has(object, ['a', 'b']);
     * // => true
     *
     * _.has(other, 'a');
     * // => false
     */
    function has(object, path) {
      return object != null && hasPath(object, path, baseHas);
    }

    /**
     * Checks if `path` is a direct or inherited property of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path to check.
     * @returns {boolean} Returns `true` if `path` exists, else `false`.
     * @example
     *
     * var object = _.create({ 'a': _.create({ 'b': 2 }) });
     *
     * _.hasIn(object, 'a');
     * // => true
     *
     * _.hasIn(object, 'a.b');
     * // => true
     *
     * _.hasIn(object, ['a', 'b']);
     * // => true
     *
     * _.hasIn(object, 'b');
     * // => false
     */
    function hasIn(object, path) {
      return object != null && hasPath(object, path, baseHasIn);
    }

    /**
     * Creates an object composed of the inverted keys and values of `object`.
     * If `object` contains duplicate values, subsequent values overwrite
     * property assignments of previous values.
     *
     * @static
     * @memberOf _
     * @since 0.7.0
     * @category Object
     * @param {Object} object The object to invert.
     * @returns {Object} Returns the new inverted object.
     * @example
     *
     * var object = { 'a': 1, 'b': 2, 'c': 1 };
     *
     * _.invert(object);
     * // => { '1': 'c', '2': 'b' }
     */
    var invert = createInverter(function(result, value, key) {
      if (value != null &&
          typeof value.toString != 'function') {
        value = nativeObjectToString.call(value);
      }

      result[value] = key;
    }, constant(identity));

    /**
     * This method is like `_.invert` except that the inverted object is generated
     * from the results of running each element of `object` thru `iteratee`. The
     * corresponding inverted value of each inverted key is an array of keys
     * responsible for generating the inverted value. The iteratee is invoked
     * with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.1.0
     * @category Object
     * @param {Object} object The object to invert.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {Object} Returns the new inverted object.
     * @example
     *
     * var object = { 'a': 1, 'b': 2, 'c': 1 };
     *
     * _.invertBy(object);
     * // => { '1': ['a', 'c'], '2': ['b'] }
     *
     * _.invertBy(object, function(value) {
     *   return 'group' + value;
     * });
     * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
     */
    var invertBy = createInverter(function(result, value, key) {
      if (value != null &&
          typeof value.toString != 'function') {
        value = nativeObjectToString.call(value);
      }

      if (hasOwnProperty.call(result, value)) {
        result[value].push(key);
      } else {
        result[value] = [key];
      }
    }, getIteratee);

    /**
     * Invokes the method at `path` of `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the method to invoke.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {*} Returns the result of the invoked method.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
     *
     * _.invoke(object, 'a[0].b.c.slice', 1, 3);
     * // => [2, 3]
     */
    var invoke = baseRest(baseInvoke);

    /**
     * Creates an array of the own enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects. See the
     * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
     * for more details.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keys(new Foo);
     * // => ['a', 'b'] (iteration order is not guaranteed)
     *
     * _.keys('hi');
     * // => ['0', '1']
     */
    function keys(object) {
      return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
    }

    /**
     * Creates an array of the own and inherited enumerable property names of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property names.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.keysIn(new Foo);
     * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
     */
    function keysIn(object) {
      return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
    }

    /**
     * The opposite of `_.mapValues`; this method creates an object with the
     * same values as `object` and keys generated by running each own enumerable
     * string keyed property of `object` thru `iteratee`. The iteratee is invoked
     * with three arguments: (value, key, object).
     *
     * @static
     * @memberOf _
     * @since 3.8.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns the new mapped object.
     * @see _.mapValues
     * @example
     *
     * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
     *   return key + value;
     * });
     * // => { 'a1': 1, 'b2': 2 }
     */
    function mapKeys(object, iteratee) {
      var result = {};
      iteratee = getIteratee(iteratee, 3);

      baseForOwn(object, function(value, key, object) {
        baseAssignValue(result, iteratee(value, key, object), value);
      });
      return result;
    }

    /**
     * Creates an object with the same keys as `object` and values generated
     * by running each own enumerable string keyed property of `object` thru
     * `iteratee`. The iteratee is invoked with three arguments:
     * (value, key, object).
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Object} Returns the new mapped object.
     * @see _.mapKeys
     * @example
     *
     * var users = {
     *   'fred':    { 'user': 'fred',    'age': 40 },
     *   'pebbles': { 'user': 'pebbles', 'age': 1 }
     * };
     *
     * _.mapValues(users, function(o) { return o.age; });
     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
     *
     * // The `_.property` iteratee shorthand.
     * _.mapValues(users, 'age');
     * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
     */
    function mapValues(object, iteratee) {
      var result = {};
      iteratee = getIteratee(iteratee, 3);

      baseForOwn(object, function(value, key, object) {
        baseAssignValue(result, key, iteratee(value, key, object));
      });
      return result;
    }

    /**
     * This method is like `_.assign` except that it recursively merges own and
     * inherited enumerable string keyed properties of source objects into the
     * destination object. Source properties that resolve to `undefined` are
     * skipped if a destination value exists. Array and plain object properties
     * are merged recursively. Other objects and value types are overridden by
     * assignment. Source objects are applied from left to right. Subsequent
     * sources overwrite property assignments of previous sources.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 0.5.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} [sources] The source objects.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {
     *   'a': [{ 'b': 2 }, { 'd': 4 }]
     * };
     *
     * var other = {
     *   'a': [{ 'c': 3 }, { 'e': 5 }]
     * };
     *
     * _.merge(object, other);
     * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
     */
    var merge = createAssigner(function(object, source, srcIndex) {
      baseMerge(object, source, srcIndex);
    });

    /**
     * This method is like `_.merge` except that it accepts `customizer` which
     * is invoked to produce the merged values of the destination and source
     * properties. If `customizer` returns `undefined`, merging is handled by the
     * method instead. The `customizer` is invoked with six arguments:
     * (objValue, srcValue, key, object, source, stack).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The destination object.
     * @param {...Object} sources The source objects.
     * @param {Function} customizer The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * function customizer(objValue, srcValue) {
     *   if (_.isArray(objValue)) {
     *     return objValue.concat(srcValue);
     *   }
     * }
     *
     * var object = { 'a': [1], 'b': [2] };
     * var other = { 'a': [3], 'b': [4] };
     *
     * _.mergeWith(object, other, customizer);
     * // => { 'a': [1, 3], 'b': [2, 4] }
     */
    var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
      baseMerge(object, source, srcIndex, customizer);
    });

    /**
     * The opposite of `_.pick`; this method creates an object composed of the
     * own and inherited enumerable property paths of `object` that are not omitted.
     *
     * **Note:** This method is considerably slower than `_.pick`.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {...(string|string[])} [paths] The property paths to omit.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'a': 1, 'b': '2', 'c': 3 };
     *
     * _.omit(object, ['a', 'c']);
     * // => { 'b': '2' }
     */
    var omit = flatRest(function(object, paths) {
      var result = {};
      if (object == null) {
        return result;
      }
      var isDeep = false;
      paths = arrayMap(paths, function(path) {
        path = castPath(path, object);
        isDeep || (isDeep = path.length > 1);
        return path;
      });
      copyObject(object, getAllKeysIn(object), result);
      if (isDeep) {
        result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
      }
      var length = paths.length;
      while (length--) {
        baseUnset(result, paths[length]);
      }
      return result;
    });

    /**
     * The opposite of `_.pickBy`; this method creates an object composed of
     * the own and inherited enumerable string keyed properties of `object` that
     * `predicate` doesn't return truthy for. The predicate is invoked with two
     * arguments: (value, key).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The source object.
     * @param {Function} [predicate=_.identity] The function invoked per property.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'a': 1, 'b': '2', 'c': 3 };
     *
     * _.omitBy(object, _.isNumber);
     * // => { 'b': '2' }
     */
    function omitBy(object, predicate) {
      return pickBy(object, negate(getIteratee(predicate)));
    }

    /**
     * Creates an object composed of the picked `object` properties.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The source object.
     * @param {...(string|string[])} [paths] The property paths to pick.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'a': 1, 'b': '2', 'c': 3 };
     *
     * _.pick(object, ['a', 'c']);
     * // => { 'a': 1, 'c': 3 }
     */
    var pick = flatRest(function(object, paths) {
      return object == null ? {} : basePick(object, paths);
    });

    /**
     * Creates an object composed of the `object` properties `predicate` returns
     * truthy for. The predicate is invoked with two arguments: (value, key).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The source object.
     * @param {Function} [predicate=_.identity] The function invoked per property.
     * @returns {Object} Returns the new object.
     * @example
     *
     * var object = { 'a': 1, 'b': '2', 'c': 3 };
     *
     * _.pickBy(object, _.isNumber);
     * // => { 'a': 1, 'c': 3 }
     */
    function pickBy(object, predicate) {
      if (object == null) {
        return {};
      }
      var props = arrayMap(getAllKeysIn(object), function(prop) {
        return [prop];
      });
      predicate = getIteratee(predicate);
      return basePickBy(object, props, function(value, path) {
        return predicate(value, path[0]);
      });
    }

    /**
     * This method is like `_.get` except that if the resolved value is a
     * function it's invoked with the `this` binding of its parent object and
     * its result is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @param {Array|string} path The path of the property to resolve.
     * @param {*} [defaultValue] The value returned for `undefined` resolved values.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
     *
     * _.result(object, 'a[0].b.c1');
     * // => 3
     *
     * _.result(object, 'a[0].b.c2');
     * // => 4
     *
     * _.result(object, 'a[0].b.c3', 'default');
     * // => 'default'
     *
     * _.result(object, 'a[0].b.c3', _.constant('default'));
     * // => 'default'
     */
    function result(object, path, defaultValue) {
      path = castPath(path, object);

      var index = -1,
          length = path.length;

      // Ensure the loop is entered when path is empty.
      if (!length) {
        length = 1;
        object = undefined;
      }
      while (++index < length) {
        var value = object == null ? undefined : object[toKey(path[index])];
        if (value === undefined) {
          index = length;
          value = defaultValue;
        }
        object = isFunction(value) ? value.call(object) : value;
      }
      return object;
    }

    /**
     * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
     * it's created. Arrays are created for missing index properties while objects
     * are created for all other missing properties. Use `_.setWith` to customize
     * `path` creation.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.set(object, 'a[0].b.c', 4);
     * console.log(object.a[0].b.c);
     * // => 4
     *
     * _.set(object, ['x', '0', 'y', 'z'], 5);
     * console.log(object.x[0].y.z);
     * // => 5
     */
    function set(object, path, value) {
      return object == null ? object : baseSet(object, path, value);
    }

    /**
     * This method is like `_.set` except that it accepts `customizer` which is
     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
     * path creation is handled by the method instead. The `customizer` is invoked
     * with three arguments: (nsValue, key, nsObject).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {*} value The value to set.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {};
     *
     * _.setWith(object, '[0][1]', 'a', Object);
     * // => { '0': { '1': 'a' } }
     */
    function setWith(object, path, value, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      return object == null ? object : baseSet(object, path, value, customizer);
    }

    /**
     * Creates an array of own enumerable string keyed-value pairs for `object`
     * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
     * entries are returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias entries
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the key-value pairs.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.toPairs(new Foo);
     * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
     */
    var toPairs = createToPairs(keys);

    /**
     * Creates an array of own and inherited enumerable string keyed-value pairs
     * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
     * or set, its entries are returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @alias entriesIn
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the key-value pairs.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.toPairsIn(new Foo);
     * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
     */
    var toPairsIn = createToPairs(keysIn);

    /**
     * An alternative to `_.reduce`; this method transforms `object` to a new
     * `accumulator` object which is the result of running each of its own
     * enumerable string keyed properties thru `iteratee`, with each invocation
     * potentially mutating the `accumulator` object. If `accumulator` is not
     * provided, a new object with the same `[[Prototype]]` will be used. The
     * iteratee is invoked with four arguments: (accumulator, value, key, object).
     * Iteratee functions may exit iteration early by explicitly returning `false`.
     *
     * @static
     * @memberOf _
     * @since 1.3.0
     * @category Object
     * @param {Object} object The object to iterate over.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @param {*} [accumulator] The custom accumulator value.
     * @returns {*} Returns the accumulated value.
     * @example
     *
     * _.transform([2, 3, 4], function(result, n) {
     *   result.push(n *= n);
     *   return n % 2 == 0;
     * }, []);
     * // => [4, 9]
     *
     * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
     *   (result[value] || (result[value] = [])).push(key);
     * }, {});
     * // => { '1': ['a', 'c'], '2': ['b'] }
     */
    function transform(object, iteratee, accumulator) {
      var isArr = isArray(object),
          isArrLike = isArr || isBuffer(object) || isTypedArray(object);

      iteratee = getIteratee(iteratee, 4);
      if (accumulator == null) {
        var Ctor = object && object.constructor;
        if (isArrLike) {
          accumulator = isArr ? new Ctor : [];
        }
        else if (isObject(object)) {
          accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
        }
        else {
          accumulator = {};
        }
      }
      (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
        return iteratee(accumulator, value, index, object);
      });
      return accumulator;
    }

    /**
     * Removes the property at `path` of `object`.
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to unset.
     * @returns {boolean} Returns `true` if the property is deleted, else `false`.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 7 } }] };
     * _.unset(object, 'a[0].b.c');
     * // => true
     *
     * console.log(object);
     * // => { 'a': [{ 'b': {} }] };
     *
     * _.unset(object, ['a', '0', 'b', 'c']);
     * // => true
     *
     * console.log(object);
     * // => { 'a': [{ 'b': {} }] };
     */
    function unset(object, path) {
      return object == null ? true : baseUnset(object, path);
    }

    /**
     * This method is like `_.set` except that accepts `updater` to produce the
     * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
     * is invoked with one argument: (value).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {Function} updater The function to produce the updated value.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = { 'a': [{ 'b': { 'c': 3 } }] };
     *
     * _.update(object, 'a[0].b.c', function(n) { return n * n; });
     * console.log(object.a[0].b.c);
     * // => 9
     *
     * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
     * console.log(object.x[0].y.z);
     * // => 0
     */
    function update(object, path, updater) {
      return object == null ? object : baseUpdate(object, path, castFunction(updater));
    }

    /**
     * This method is like `_.update` except that it accepts `customizer` which is
     * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
     * path creation is handled by the method instead. The `customizer` is invoked
     * with three arguments: (nsValue, key, nsObject).
     *
     * **Note:** This method mutates `object`.
     *
     * @static
     * @memberOf _
     * @since 4.6.0
     * @category Object
     * @param {Object} object The object to modify.
     * @param {Array|string} path The path of the property to set.
     * @param {Function} updater The function to produce the updated value.
     * @param {Function} [customizer] The function to customize assigned values.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var object = {};
     *
     * _.updateWith(object, '[0][1]', _.constant('a'), Object);
     * // => { '0': { '1': 'a' } }
     */
    function updateWith(object, path, updater, customizer) {
      customizer = typeof customizer == 'function' ? customizer : undefined;
      return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
    }

    /**
     * Creates an array of the own enumerable string keyed property values of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.values(new Foo);
     * // => [1, 2] (iteration order is not guaranteed)
     *
     * _.values('hi');
     * // => ['h', 'i']
     */
    function values(object) {
      return object == null ? [] : baseValues(object, keys(object));
    }

    /**
     * Creates an array of the own and inherited enumerable string keyed property
     * values of `object`.
     *
     * **Note:** Non-object values are coerced to objects.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Object
     * @param {Object} object The object to query.
     * @returns {Array} Returns the array of property values.
     * @example
     *
     * function Foo() {
     *   this.a = 1;
     *   this.b = 2;
     * }
     *
     * Foo.prototype.c = 3;
     *
     * _.valuesIn(new Foo);
     * // => [1, 2, 3] (iteration order is not guaranteed)
     */
    function valuesIn(object) {
      return object == null ? [] : baseValues(object, keysIn(object));
    }

    /*------------------------------------------------------------------------*/

    /**
     * Clamps `number` within the inclusive `lower` and `upper` bounds.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Number
     * @param {number} number The number to clamp.
     * @param {number} [lower] The lower bound.
     * @param {number} upper The upper bound.
     * @returns {number} Returns the clamped number.
     * @example
     *
     * _.clamp(-10, -5, 5);
     * // => -5
     *
     * _.clamp(10, -5, 5);
     * // => 5
     */
    function clamp(number, lower, upper) {
      if (upper === undefined) {
        upper = lower;
        lower = undefined;
      }
      if (upper !== undefined) {
        upper = toNumber(upper);
        upper = upper === upper ? upper : 0;
      }
      if (lower !== undefined) {
        lower = toNumber(lower);
        lower = lower === lower ? lower : 0;
      }
      return baseClamp(toNumber(number), lower, upper);
    }

    /**
     * Checks if `n` is between `start` and up to, but not including, `end`. If
     * `end` is not specified, it's set to `start` with `start` then set to `0`.
     * If `start` is greater than `end` the params are swapped to support
     * negative ranges.
     *
     * @static
     * @memberOf _
     * @since 3.3.0
     * @category Number
     * @param {number} number The number to check.
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
     * @see _.range, _.rangeRight
     * @example
     *
     * _.inRange(3, 2, 4);
     * // => true
     *
     * _.inRange(4, 8);
     * // => true
     *
     * _.inRange(4, 2);
     * // => false
     *
     * _.inRange(2, 2);
     * // => false
     *
     * _.inRange(1.2, 2);
     * // => true
     *
     * _.inRange(5.2, 4);
     * // => false
     *
     * _.inRange(-3, -2, -6);
     * // => true
     */
    function inRange(number, start, end) {
      start = toFinite(start);
      if (end === undefined) {
        end = start;
        start = 0;
      } else {
        end = toFinite(end);
      }
      number = toNumber(number);
      return baseInRange(number, start, end);
    }

    /**
     * Produces a random number between the inclusive `lower` and `upper` bounds.
     * If only one argument is provided a number between `0` and the given number
     * is returned. If `floating` is `true`, or either `lower` or `upper` are
     * floats, a floating-point number is returned instead of an integer.
     *
     * **Note:** JavaScript follows the IEEE-754 standard for resolving
     * floating-point values which can produce unexpected results.
     *
     * @static
     * @memberOf _
     * @since 0.7.0
     * @category Number
     * @param {number} [lower=0] The lower bound.
     * @param {number} [upper=1] The upper bound.
     * @param {boolean} [floating] Specify returning a floating-point number.
     * @returns {number} Returns the random number.
     * @example
     *
     * _.random(0, 5);
     * // => an integer between 0 and 5
     *
     * _.random(5);
     * // => also an integer between 0 and 5
     *
     * _.random(5, true);
     * // => a floating-point number between 0 and 5
     *
     * _.random(1.2, 5.2);
     * // => a floating-point number between 1.2 and 5.2
     */
    function random(lower, upper, floating) {
      if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
        upper = floating = undefined;
      }
      if (floating === undefined) {
        if (typeof upper == 'boolean') {
          floating = upper;
          upper = undefined;
        }
        else if (typeof lower == 'boolean') {
          floating = lower;
          lower = undefined;
        }
      }
      if (lower === undefined && upper === undefined) {
        lower = 0;
        upper = 1;
      }
      else {
        lower = toFinite(lower);
        if (upper === undefined) {
          upper = lower;
          lower = 0;
        } else {
          upper = toFinite(upper);
        }
      }
      if (lower > upper) {
        var temp = lower;
        lower = upper;
        upper = temp;
      }
      if (floating || lower % 1 || upper % 1) {
        var rand = nativeRandom();
        return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
      }
      return baseRandom(lower, upper);
    }

    /*------------------------------------------------------------------------*/

    /**
     * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the camel cased string.
     * @example
     *
     * _.camelCase('Foo Bar');
     * // => 'fooBar'
     *
     * _.camelCase('--foo-bar--');
     * // => 'fooBar'
     *
     * _.camelCase('__FOO_BAR__');
     * // => 'fooBar'
     */
    var camelCase = createCompounder(function(result, word, index) {
      word = word.toLowerCase();
      return result + (index ? capitalize(word) : word);
    });

    /**
     * Converts the first character of `string` to upper case and the remaining
     * to lower case.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to capitalize.
     * @returns {string} Returns the capitalized string.
     * @example
     *
     * _.capitalize('FRED');
     * // => 'Fred'
     */
    function capitalize(string) {
      return upperFirst(toString(string).toLowerCase());
    }

    /**
     * Deburrs `string` by converting
     * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
     * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
     * letters to basic Latin letters and removing
     * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to deburr.
     * @returns {string} Returns the deburred string.
     * @example
     *
     * _.deburr('déjà vu');
     * // => 'deja vu'
     */
    function deburr(string) {
      string = toString(string);
      return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
    }

    /**
     * Checks if `string` ends with the given target string.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to inspect.
     * @param {string} [target] The string to search for.
     * @param {number} [position=string.length] The position to search up to.
     * @returns {boolean} Returns `true` if `string` ends with `target`,
     *  else `false`.
     * @example
     *
     * _.endsWith('abc', 'c');
     * // => true
     *
     * _.endsWith('abc', 'b');
     * // => false
     *
     * _.endsWith('abc', 'b', 2);
     * // => true
     */
    function endsWith(string, target, position) {
      string = toString(string);
      target = baseToString(target);

      var length = string.length;
      position = position === undefined
        ? length
        : baseClamp(toInteger(position), 0, length);

      var end = position;
      position -= target.length;
      return position >= 0 && string.slice(position, end) == target;
    }

    /**
     * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
     * corresponding HTML entities.
     *
     * **Note:** No other characters are escaped. To escape additional
     * characters use a third-party library like [_he_](https://mths.be/he).
     *
     * Though the ">" character is escaped for symmetry, characters like
     * ">" and "/" don't need escaping in HTML and have no special meaning
     * unless they're part of a tag or unquoted attribute value. See
     * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
     * (under "semi-related fun fact") for more details.
     *
     * When working with HTML you should always
     * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
     * XSS vectors.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category String
     * @param {string} [string=''] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escape('fred, barney, & pebbles');
     * // => 'fred, barney, &amp; pebbles'
     */
    function escape(string) {
      string = toString(string);
      return (string && reHasUnescapedHtml.test(string))
        ? string.replace(reUnescapedHtml, escapeHtmlChar)
        : string;
    }

    /**
     * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
     * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to escape.
     * @returns {string} Returns the escaped string.
     * @example
     *
     * _.escapeRegExp('[lodash](https://lodash.com/)');
     * // => '\[lodash\]\(https://lodash\.com/\)'
     */
    function escapeRegExp(string) {
      string = toString(string);
      return (string && reHasRegExpChar.test(string))
        ? string.replace(reRegExpChar, '\\$&')
        : string;
    }

    /**
     * Converts `string` to
     * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the kebab cased string.
     * @example
     *
     * _.kebabCase('Foo Bar');
     * // => 'foo-bar'
     *
     * _.kebabCase('fooBar');
     * // => 'foo-bar'
     *
     * _.kebabCase('__FOO_BAR__');
     * // => 'foo-bar'
     */
    var kebabCase = createCompounder(function(result, word, index) {
      return result + (index ? '-' : '') + word.toLowerCase();
    });

    /**
     * Converts `string`, as space separated words, to lower case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the lower cased string.
     * @example
     *
     * _.lowerCase('--Foo-Bar--');
     * // => 'foo bar'
     *
     * _.lowerCase('fooBar');
     * // => 'foo bar'
     *
     * _.lowerCase('__FOO_BAR__');
     * // => 'foo bar'
     */
    var lowerCase = createCompounder(function(result, word, index) {
      return result + (index ? ' ' : '') + word.toLowerCase();
    });

    /**
     * Converts the first character of `string` to lower case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.lowerFirst('Fred');
     * // => 'fred'
     *
     * _.lowerFirst('FRED');
     * // => 'fRED'
     */
    var lowerFirst = createCaseFirst('toLowerCase');

    /**
     * Pads `string` on the left and right sides if it's shorter than `length`.
     * Padding characters are truncated if they can't be evenly divided by `length`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.pad('abc', 8);
     * // => '  abc   '
     *
     * _.pad('abc', 8, '_-');
     * // => '_-abc_-_'
     *
     * _.pad('abc', 3);
     * // => 'abc'
     */
    function pad(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      if (!length || strLength >= length) {
        return string;
      }
      var mid = (length - strLength) / 2;
      return (
        createPadding(nativeFloor(mid), chars) +
        string +
        createPadding(nativeCeil(mid), chars)
      );
    }

    /**
     * Pads `string` on the right side if it's shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padEnd('abc', 6);
     * // => 'abc   '
     *
     * _.padEnd('abc', 6, '_-');
     * // => 'abc_-_'
     *
     * _.padEnd('abc', 3);
     * // => 'abc'
     */
    function padEnd(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      return (length && strLength < length)
        ? (string + createPadding(length - strLength, chars))
        : string;
    }

    /**
     * Pads `string` on the left side if it's shorter than `length`. Padding
     * characters are truncated if they exceed `length`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to pad.
     * @param {number} [length=0] The padding length.
     * @param {string} [chars=' '] The string used as padding.
     * @returns {string} Returns the padded string.
     * @example
     *
     * _.padStart('abc', 6);
     * // => '   abc'
     *
     * _.padStart('abc', 6, '_-');
     * // => '_-_abc'
     *
     * _.padStart('abc', 3);
     * // => 'abc'
     */
    function padStart(string, length, chars) {
      string = toString(string);
      length = toInteger(length);

      var strLength = length ? stringSize(string) : 0;
      return (length && strLength < length)
        ? (createPadding(length - strLength, chars) + string)
        : string;
    }

    /**
     * Converts `string` to an integer of the specified radix. If `radix` is
     * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
     * hexadecimal, in which case a `radix` of `16` is used.
     *
     * **Note:** This method aligns with the
     * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
     *
     * @static
     * @memberOf _
     * @since 1.1.0
     * @category String
     * @param {string} string The string to convert.
     * @param {number} [radix=10] The radix to interpret `value` by.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {number} Returns the converted integer.
     * @example
     *
     * _.parseInt('08');
     * // => 8
     *
     * _.map(['6', '08', '10'], _.parseInt);
     * // => [6, 8, 10]
     */
    function parseInt(string, radix, guard) {
      if (guard || radix == null) {
        radix = 0;
      } else if (radix) {
        radix = +radix;
      }
      return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
    }

    /**
     * Repeats the given string `n` times.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to repeat.
     * @param {number} [n=1] The number of times to repeat the string.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the repeated string.
     * @example
     *
     * _.repeat('*', 3);
     * // => '***'
     *
     * _.repeat('abc', 2);
     * // => 'abcabc'
     *
     * _.repeat('abc', 0);
     * // => ''
     */
    function repeat(string, n, guard) {
      if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
        n = 1;
      } else {
        n = toInteger(n);
      }
      return baseRepeat(toString(string), n);
    }

    /**
     * Replaces matches for `pattern` in `string` with `replacement`.
     *
     * **Note:** This method is based on
     * [`String#replace`](https://mdn.io/String/replace).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to modify.
     * @param {RegExp|string} pattern The pattern to replace.
     * @param {Function|string} replacement The match replacement.
     * @returns {string} Returns the modified string.
     * @example
     *
     * _.replace('Hi Fred', 'Fred', 'Barney');
     * // => 'Hi Barney'
     */
    function replace() {
      var args = arguments,
          string = toString(args[0]);

      return args.length < 3 ? string : string.replace(args[1], args[2]);
    }

    /**
     * Converts `string` to
     * [snake case](https://en.wikipedia.org/wiki/Snake_case).
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the snake cased string.
     * @example
     *
     * _.snakeCase('Foo Bar');
     * // => 'foo_bar'
     *
     * _.snakeCase('fooBar');
     * // => 'foo_bar'
     *
     * _.snakeCase('--FOO-BAR--');
     * // => 'foo_bar'
     */
    var snakeCase = createCompounder(function(result, word, index) {
      return result + (index ? '_' : '') + word.toLowerCase();
    });

    /**
     * Splits `string` by `separator`.
     *
     * **Note:** This method is based on
     * [`String#split`](https://mdn.io/String/split).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to split.
     * @param {RegExp|string} separator The separator pattern to split by.
     * @param {number} [limit] The length to truncate results to.
     * @returns {Array} Returns the string segments.
     * @example
     *
     * _.split('a-b-c', '-', 2);
     * // => ['a', 'b']
     */
    function split(string, separator, limit) {
      if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
        separator = limit = undefined;
      }
      limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
      if (!limit) {
        return [];
      }
      string = toString(string);
      if (string && (
            typeof separator == 'string' ||
            (separator != null && !isRegExp(separator))
          )) {
        separator = baseToString(separator);
        if (!separator && hasUnicode(string)) {
          return castSlice(stringToArray(string), 0, limit);
        }
      }
      return string.split(separator, limit);
    }

    /**
     * Converts `string` to
     * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
     *
     * @static
     * @memberOf _
     * @since 3.1.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the start cased string.
     * @example
     *
     * _.startCase('--foo-bar--');
     * // => 'Foo Bar'
     *
     * _.startCase('fooBar');
     * // => 'Foo Bar'
     *
     * _.startCase('__FOO_BAR__');
     * // => 'FOO BAR'
     */
    var startCase = createCompounder(function(result, word, index) {
      return result + (index ? ' ' : '') + upperFirst(word);
    });

    /**
     * Checks if `string` starts with the given target string.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to inspect.
     * @param {string} [target] The string to search for.
     * @param {number} [position=0] The position to search from.
     * @returns {boolean} Returns `true` if `string` starts with `target`,
     *  else `false`.
     * @example
     *
     * _.startsWith('abc', 'a');
     * // => true
     *
     * _.startsWith('abc', 'b');
     * // => false
     *
     * _.startsWith('abc', 'b', 1);
     * // => true
     */
    function startsWith(string, target, position) {
      string = toString(string);
      position = position == null
        ? 0
        : baseClamp(toInteger(position), 0, string.length);

      target = baseToString(target);
      return string.slice(position, position + target.length) == target;
    }

    /**
     * Creates a compiled template function that can interpolate data properties
     * in "interpolate" delimiters, HTML-escape interpolated data properties in
     * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
     * properties may be accessed as free variables in the template. If a setting
     * object is given, it takes precedence over `_.templateSettings` values.
     *
     * **Note:** In the development build `_.template` utilizes
     * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
     * for easier debugging.
     *
     * For more information on precompiling templates see
     * [lodash's custom builds documentation](https://lodash.com/custom-builds).
     *
     * For more information on Chrome extension sandboxes see
     * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category String
     * @param {string} [string=''] The template string.
     * @param {Object} [options={}] The options object.
     * @param {RegExp} [options.escape=_.templateSettings.escape]
     *  The HTML "escape" delimiter.
     * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
     *  The "evaluate" delimiter.
     * @param {Object} [options.imports=_.templateSettings.imports]
     *  An object to import into the template as free variables.
     * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
     *  The "interpolate" delimiter.
     * @param {string} [options.sourceURL='lodash.templateSources[n]']
     *  The sourceURL of the compiled template.
     * @param {string} [options.variable='obj']
     *  The data object variable name.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Function} Returns the compiled template function.
     * @example
     *
     * // Use the "interpolate" delimiter to create a compiled template.
     * var compiled = _.template('hello <%= user %>!');
     * compiled({ 'user': 'fred' });
     * // => 'hello fred!'
     *
     * // Use the HTML "escape" delimiter to escape data property values.
     * var compiled = _.template('<b><%- value %></b>');
     * compiled({ 'value': '<script>' });
     * // => '<b>&lt;script&gt;</b>'
     *
     * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
     * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
     * compiled({ 'users': ['fred', 'barney'] });
     * // => '<li>fred</li><li>barney</li>'
     *
     * // Use the internal `print` function in "evaluate" delimiters.
     * var compiled = _.template('<% print("hello " + user); %>!');
     * compiled({ 'user': 'barney' });
     * // => 'hello barney!'
     *
     * // Use the ES template literal delimiter as an "interpolate" delimiter.
     * // Disable support by replacing the "interpolate" delimiter.
     * var compiled = _.template('hello ${ user }!');
     * compiled({ 'user': 'pebbles' });
     * // => 'hello pebbles!'
     *
     * // Use backslashes to treat delimiters as plain text.
     * var compiled = _.template('<%= "\\<%- value %\\>" %>');
     * compiled({ 'value': 'ignored' });
     * // => '<%- value %>'
     *
     * // Use the `imports` option to import `jQuery` as `jq`.
     * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
     * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
     * compiled({ 'users': ['fred', 'barney'] });
     * // => '<li>fred</li><li>barney</li>'
     *
     * // Use the `sourceURL` option to specify a custom sourceURL for the template.
     * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
     * compiled(data);
     * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
     *
     * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
     * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
     * compiled.source;
     * // => function(data) {
     * //   var __t, __p = '';
     * //   __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
     * //   return __p;
     * // }
     *
     * // Use custom template delimiters.
     * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
     * var compiled = _.template('hello {{ user }}!');
     * compiled({ 'user': 'mustache' });
     * // => 'hello mustache!'
     *
     * // Use the `source` property to inline compiled templates for meaningful
     * // line numbers in error messages and stack traces.
     * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
     *   var JST = {\
     *     "main": ' + _.template(mainText).source + '\
     *   };\
     * ');
     */
    function template(string, options, guard) {
      // Based on John Resig's `tmpl` implementation
      // (http://ejohn.org/blog/javascript-micro-templating/)
      // and Laura Doktorova's doT.js (https://github.com/olado/doT).
      var settings = lodash.templateSettings;

      if (guard && isIterateeCall(string, options, guard)) {
        options = undefined;
      }
      string = toString(string);
      options = assignInWith({}, options, settings, customDefaultsAssignIn);

      var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
          importsKeys = keys(imports),
          importsValues = baseValues(imports, importsKeys);

      var isEscaping,
          isEvaluating,
          index = 0,
          interpolate = options.interpolate || reNoMatch,
          source = "__p += '";

      // Compile the regexp to match each delimiter.
      var reDelimiters = RegExp(
        (options.escape || reNoMatch).source + '|' +
        interpolate.source + '|' +
        (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
        (options.evaluate || reNoMatch).source + '|$'
      , 'g');

      // Use a sourceURL for easier debugging.
      // The sourceURL gets injected into the source that's eval-ed, so be careful
      // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can't sneak in
      // and escape the comment, thus injecting code that gets evaled.
      var sourceURL = '//# sourceURL=' +
        (hasOwnProperty.call(options, 'sourceURL')
          ? (options.sourceURL + '').replace(/\s/g, ' ')
          : ('lodash.templateSources[' + (++templateCounter) + ']')
        ) + '\n';

      string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
        interpolateValue || (interpolateValue = esTemplateValue);

        // Escape characters that can't be included in string literals.
        source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);

        // Replace delimiters with snippets.
        if (escapeValue) {
          isEscaping = true;
          source += "' +\n__e(" + escapeValue + ") +\n'";
        }
        if (evaluateValue) {
          isEvaluating = true;
          source += "';\n" + evaluateValue + ";\n__p += '";
        }
        if (interpolateValue) {
          source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
        }
        index = offset + match.length;

        // The JS engine embedded in Adobe products needs `match` returned in
        // order to produce the correct `offset` value.
        return match;
      });

      source += "';\n";

      // If `variable` is not specified wrap a with-statement around the generated
      // code to add the data object to the top of the scope chain.
      var variable = hasOwnProperty.call(options, 'variable') && options.variable;
      if (!variable) {
        source = 'with (obj) {\n' + source + '\n}\n';
      }
      // Throw an error if a forbidden character was found in `variable`, to prevent
      // potential command injection attacks.
      else if (reForbiddenIdentifierChars.test(variable)) {
        throw new Error(INVALID_TEMPL_VAR_ERROR_TEXT);
      }

      // Cleanup code by stripping empty strings.
      source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
        .replace(reEmptyStringMiddle, '$1')
        .replace(reEmptyStringTrailing, '$1;');

      // Frame code as the function body.
      source = 'function(' + (variable || 'obj') + ') {\n' +
        (variable
          ? ''
          : 'obj || (obj = {});\n'
        ) +
        "var __t, __p = ''" +
        (isEscaping
           ? ', __e = _.escape'
           : ''
        ) +
        (isEvaluating
          ? ', __j = Array.prototype.join;\n' +
            "function print() { __p += __j.call(arguments, '') }\n"
          : ';\n'
        ) +
        source +
        'return __p\n}';

      var result = attempt(function() {
        return Function(importsKeys, sourceURL + 'return ' + source)
          .apply(undefined, importsValues);
      });

      // Provide the compiled function's source by its `toString` method or
      // the `source` property as a convenience for inlining compiled templates.
      result.source = source;
      if (isError(result)) {
        throw result;
      }
      return result;
    }

    /**
     * Converts `string`, as a whole, to lower case just like
     * [String#toLowerCase](https://mdn.io/toLowerCase).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the lower cased string.
     * @example
     *
     * _.toLower('--Foo-Bar--');
     * // => '--foo-bar--'
     *
     * _.toLower('fooBar');
     * // => 'foobar'
     *
     * _.toLower('__FOO_BAR__');
     * // => '__foo_bar__'
     */
    function toLower(value) {
      return toString(value).toLowerCase();
    }

    /**
     * Converts `string`, as a whole, to upper case just like
     * [String#toUpperCase](https://mdn.io/toUpperCase).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the upper cased string.
     * @example
     *
     * _.toUpper('--foo-bar--');
     * // => '--FOO-BAR--'
     *
     * _.toUpper('fooBar');
     * // => 'FOOBAR'
     *
     * _.toUpper('__foo_bar__');
     * // => '__FOO_BAR__'
     */
    function toUpper(value) {
      return toString(value).toUpperCase();
    }

    /**
     * Removes leading and trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trim('  abc  ');
     * // => 'abc'
     *
     * _.trim('-_-abc-_-', '_-');
     * // => 'abc'
     *
     * _.map(['  foo  ', '  bar  '], _.trim);
     * // => ['foo', 'bar']
     */
    function trim(string, chars, guard) {
      string = toString(string);
      if (string && (guard || chars === undefined)) {
        return baseTrim(string);
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          chrSymbols = stringToArray(chars),
          start = charsStartIndex(strSymbols, chrSymbols),
          end = charsEndIndex(strSymbols, chrSymbols) + 1;

      return castSlice(strSymbols, start, end).join('');
    }

    /**
     * Removes trailing whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimEnd('  abc  ');
     * // => '  abc'
     *
     * _.trimEnd('-_-abc-_-', '_-');
     * // => '-_-abc'
     */
    function trimEnd(string, chars, guard) {
      string = toString(string);
      if (string && (guard || chars === undefined)) {
        return string.slice(0, trimmedEndIndex(string) + 1);
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;

      return castSlice(strSymbols, 0, end).join('');
    }

    /**
     * Removes leading whitespace or specified characters from `string`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to trim.
     * @param {string} [chars=whitespace] The characters to trim.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {string} Returns the trimmed string.
     * @example
     *
     * _.trimStart('  abc  ');
     * // => 'abc  '
     *
     * _.trimStart('-_-abc-_-', '_-');
     * // => 'abc-_-'
     */
    function trimStart(string, chars, guard) {
      string = toString(string);
      if (string && (guard || chars === undefined)) {
        return string.replace(reTrimStart, '');
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          start = charsStartIndex(strSymbols, stringToArray(chars));

      return castSlice(strSymbols, start).join('');
    }

    /**
     * Truncates `string` if it's longer than the given maximum string length.
     * The last characters of the truncated string are replaced with the omission
     * string which defaults to "...".
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to truncate.
     * @param {Object} [options={}] The options object.
     * @param {number} [options.length=30] The maximum string length.
     * @param {string} [options.omission='...'] The string to indicate text is omitted.
     * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
     * @returns {string} Returns the truncated string.
     * @example
     *
     * _.truncate('hi-diddly-ho there, neighborino');
     * // => 'hi-diddly-ho there, neighbo...'
     *
     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': ' '
     * });
     * // => 'hi-diddly-ho there,...'
     *
     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'length': 24,
     *   'separator': /,? +/
     * });
     * // => 'hi-diddly-ho there...'
     *
     * _.truncate('hi-diddly-ho there, neighborino', {
     *   'omission': ' [...]'
     * });
     * // => 'hi-diddly-ho there, neig [...]'
     */
    function truncate(string, options) {
      var length = DEFAULT_TRUNC_LENGTH,
          omission = DEFAULT_TRUNC_OMISSION;

      if (isObject(options)) {
        var separator = 'separator' in options ? options.separator : separator;
        length = 'length' in options ? toInteger(options.length) : length;
        omission = 'omission' in options ? baseToString(options.omission) : omission;
      }
      string = toString(string);

      var strLength = string.length;
      if (hasUnicode(string)) {
        var strSymbols = stringToArray(string);
        strLength = strSymbols.length;
      }
      if (length >= strLength) {
        return string;
      }
      var end = length - stringSize(omission);
      if (end < 1) {
        return omission;
      }
      var result = strSymbols
        ? castSlice(strSymbols, 0, end).join('')
        : string.slice(0, end);

      if (separator === undefined) {
        return result + omission;
      }
      if (strSymbols) {
        end += (result.length - end);
      }
      if (isRegExp(separator)) {
        if (string.slice(end).search(separator)) {
          var match,
              substring = result;

          if (!separator.global) {
            separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
          }
          separator.lastIndex = 0;
          while ((match = separator.exec(substring))) {
            var newEnd = match.index;
          }
          result = result.slice(0, newEnd === undefined ? end : newEnd);
        }
      } else if (string.indexOf(baseToString(separator), end) != end) {
        var index = result.lastIndexOf(separator);
        if (index > -1) {
          result = result.slice(0, index);
        }
      }
      return result + omission;
    }

    /**
     * The inverse of `_.escape`; this method converts the HTML entities
     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
     * their corresponding characters.
     *
     * **Note:** No other HTML entities are unescaped. To unescape additional
     * HTML entities use a third-party library like [_he_](https://mths.be/he).
     *
     * @static
     * @memberOf _
     * @since 0.6.0
     * @category String
     * @param {string} [string=''] The string to unescape.
     * @returns {string} Returns the unescaped string.
     * @example
     *
     * _.unescape('fred, barney, &amp; pebbles');
     * // => 'fred, barney, & pebbles'
     */
    function unescape(string) {
      string = toString(string);
      return (string && reHasEscapedHtml.test(string))
        ? string.replace(reEscapedHtml, unescapeHtmlChar)
        : string;
    }

    /**
     * Converts `string`, as space separated words, to upper case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the upper cased string.
     * @example
     *
     * _.upperCase('--foo-bar');
     * // => 'FOO BAR'
     *
     * _.upperCase('fooBar');
     * // => 'FOO BAR'
     *
     * _.upperCase('__foo_bar__');
     * // => 'FOO BAR'
     */
    var upperCase = createCompounder(function(result, word, index) {
      return result + (index ? ' ' : '') + word.toUpperCase();
    });

    /**
     * Converts the first character of `string` to upper case.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category String
     * @param {string} [string=''] The string to convert.
     * @returns {string} Returns the converted string.
     * @example
     *
     * _.upperFirst('fred');
     * // => 'Fred'
     *
     * _.upperFirst('FRED');
     * // => 'FRED'
     */
    var upperFirst = createCaseFirst('toUpperCase');

    /**
     * Splits `string` into an array of its words.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category String
     * @param {string} [string=''] The string to inspect.
     * @param {RegExp|string} [pattern] The pattern to match words.
     * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
     * @returns {Array} Returns the words of `string`.
     * @example
     *
     * _.words('fred, barney, & pebbles');
     * // => ['fred', 'barney', 'pebbles']
     *
     * _.words('fred, barney, & pebbles', /[^, ]+/g);
     * // => ['fred', 'barney', '&', 'pebbles']
     */
    function words(string, pattern, guard) {
      string = toString(string);
      pattern = guard ? undefined : pattern;

      if (pattern === undefined) {
        return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
      }
      return string.match(pattern) || [];
    }

    /*------------------------------------------------------------------------*/

    /**
     * Attempts to invoke `func`, returning either the result or the caught error
     * object. Any additional arguments are provided to `func` when it's invoked.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Function} func The function to attempt.
     * @param {...*} [args] The arguments to invoke `func` with.
     * @returns {*} Returns the `func` result or error object.
     * @example
     *
     * // Avoid throwing errors for invalid selectors.
     * var elements = _.attempt(function(selector) {
     *   return document.querySelectorAll(selector);
     * }, '>_>');
     *
     * if (_.isError(elements)) {
     *   elements = [];
     * }
     */
    var attempt = baseRest(function(func, args) {
      try {
        return apply(func, undefined, args);
      } catch (e) {
        return isError(e) ? e : new Error(e);
      }
    });

    /**
     * Binds methods of an object to the object itself, overwriting the existing
     * method.
     *
     * **Note:** This method doesn't set the "length" property of bound functions.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {Object} object The object to bind and assign the bound methods to.
     * @param {...(string|string[])} methodNames The object method names to bind.
     * @returns {Object} Returns `object`.
     * @example
     *
     * var view = {
     *   'label': 'docs',
     *   'click': function() {
     *     console.log('clicked ' + this.label);
     *   }
     * };
     *
     * _.bindAll(view, ['click']);
     * jQuery(element).on('click', view.click);
     * // => Logs 'clicked docs' when clicked.
     */
    var bindAll = flatRest(function(object, methodNames) {
      arrayEach(methodNames, function(key) {
        key = toKey(key);
        baseAssignValue(object, key, bind(object[key], object));
      });
      return object;
    });

    /**
     * Creates a function that iterates over `pairs` and invokes the corresponding
     * function of the first predicate to return truthy. The predicate-function
     * pairs are invoked with the `this` binding and arguments of the created
     * function.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {Array} pairs The predicate-function pairs.
     * @returns {Function} Returns the new composite function.
     * @example
     *
     * var func = _.cond([
     *   [_.matches({ 'a': 1 }),           _.constant('matches A')],
     *   [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
     *   [_.stubTrue,                      _.constant('no match')]
     * ]);
     *
     * func({ 'a': 1, 'b': 2 });
     * // => 'matches A'
     *
     * func({ 'a': 0, 'b': 1 });
     * // => 'matches B'
     *
     * func({ 'a': '1', 'b': '2' });
     * // => 'no match'
     */
    function cond(pairs) {
      var length = pairs == null ? 0 : pairs.length,
          toIteratee = getIteratee();

      pairs = !length ? [] : arrayMap(pairs, function(pair) {
        if (typeof pair[1] != 'function') {
          throw new TypeError(FUNC_ERROR_TEXT);
        }
        return [toIteratee(pair[0]), pair[1]];
      });

      return baseRest(function(args) {
        var index = -1;
        while (++index < length) {
          var pair = pairs[index];
          if (apply(pair[0], this, args)) {
            return apply(pair[1], this, args);
          }
        }
      });
    }

    /**
     * Creates a function that invokes the predicate properties of `source` with
     * the corresponding property values of a given object, returning `true` if
     * all predicates return truthy, else `false`.
     *
     * **Note:** The created function is equivalent to `_.conformsTo` with
     * `source` partially applied.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {Object} source The object of property predicates to conform to.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { 'a': 2, 'b': 1 },
     *   { 'a': 1, 'b': 2 }
     * ];
     *
     * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
     * // => [{ 'a': 1, 'b': 2 }]
     */
    function conforms(source) {
      return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that returns `value`.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Util
     * @param {*} value The value to return from the new function.
     * @returns {Function} Returns the new constant function.
     * @example
     *
     * var objects = _.times(2, _.constant({ 'a': 1 }));
     *
     * console.log(objects);
     * // => [{ 'a': 1 }, { 'a': 1 }]
     *
     * console.log(objects[0] === objects[1]);
     * // => true
     */
    function constant(value) {
      return function() {
        return value;
      };
    }

    /**
     * Checks `value` to determine whether a default value should be returned in
     * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
     * or `undefined`.
     *
     * @static
     * @memberOf _
     * @since 4.14.0
     * @category Util
     * @param {*} value The value to check.
     * @param {*} defaultValue The default value.
     * @returns {*} Returns the resolved value.
     * @example
     *
     * _.defaultTo(1, 10);
     * // => 1
     *
     * _.defaultTo(undefined, 10);
     * // => 10
     */
    function defaultTo(value, defaultValue) {
      return (value == null || value !== value) ? defaultValue : value;
    }

    /**
     * Creates a function that returns the result of invoking the given functions
     * with the `this` binding of the created function, where each successive
     * invocation is supplied the return value of the previous.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {...(Function|Function[])} [funcs] The functions to invoke.
     * @returns {Function} Returns the new composite function.
     * @see _.flowRight
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flow([_.add, square]);
     * addSquare(1, 2);
     * // => 9
     */
    var flow = createFlow();

    /**
     * This method is like `_.flow` except that it creates a function that
     * invokes the given functions from right to left.
     *
     * @static
     * @since 3.0.0
     * @memberOf _
     * @category Util
     * @param {...(Function|Function[])} [funcs] The functions to invoke.
     * @returns {Function} Returns the new composite function.
     * @see _.flow
     * @example
     *
     * function square(n) {
     *   return n * n;
     * }
     *
     * var addSquare = _.flowRight([square, _.add]);
     * addSquare(1, 2);
     * // => 9
     */
    var flowRight = createFlow(true);

    /**
     * This method returns the first argument it receives.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {*} value Any value.
     * @returns {*} Returns `value`.
     * @example
     *
     * var object = { 'a': 1 };
     *
     * console.log(_.identity(object) === object);
     * // => true
     */
    function identity(value) {
      return value;
    }

    /**
     * Creates a function that invokes `func` with the arguments of the created
     * function. If `func` is a property name, the created function returns the
     * property value for a given element. If `func` is an array or object, the
     * created function returns `true` for elements that contain the equivalent
     * source properties, otherwise it returns `false`.
     *
     * @static
     * @since 4.0.0
     * @memberOf _
     * @category Util
     * @param {*} [func=_.identity] The value to convert to a callback.
     * @returns {Function} Returns the callback.
     * @example
     *
     * var users = [
     *   { 'user': 'barney', 'age': 36, 'active': true },
     *   { 'user': 'fred',   'age': 40, 'active': false }
     * ];
     *
     * // The `_.matches` iteratee shorthand.
     * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
     * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
     *
     * // The `_.matchesProperty` iteratee shorthand.
     * _.filter(users, _.iteratee(['user', 'fred']));
     * // => [{ 'user': 'fred', 'age': 40 }]
     *
     * // The `_.property` iteratee shorthand.
     * _.map(users, _.iteratee('user'));
     * // => ['barney', 'fred']
     *
     * // Create custom iteratee shorthands.
     * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
     *   return !_.isRegExp(func) ? iteratee(func) : function(string) {
     *     return func.test(string);
     *   };
     * });
     *
     * _.filter(['abc', 'def'], /ef/);
     * // => ['def']
     */
    function iteratee(func) {
      return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that performs a partial deep comparison between a given
     * object and `source`, returning `true` if the given object has equivalent
     * property values, else `false`.
     *
     * **Note:** The created function is equivalent to `_.isMatch` with `source`
     * partially applied.
     *
     * Partial comparisons will match empty array and empty object `source`
     * values against any array or object value, respectively. See `_.isEqual`
     * for a list of supported value comparisons.
     *
     * **Note:** Multiple values can be checked by combining several matchers
     * using `_.overSome`
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Object} source The object of property values to match.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { 'a': 1, 'b': 2, 'c': 3 },
     *   { 'a': 4, 'b': 5, 'c': 6 }
     * ];
     *
     * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
     * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
     *
     * // Checking for several possible values
     * _.filter(objects, _.overSome([_.matches({ 'a': 1 }), _.matches({ 'a': 4 })]));
     * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
     */
    function matches(source) {
      return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that performs a partial deep comparison between the
     * value at `path` of a given object to `srcValue`, returning `true` if the
     * object value is equivalent, else `false`.
     *
     * **Note:** Partial comparisons will match empty array and empty object
     * `srcValue` values against any array or object value, respectively. See
     * `_.isEqual` for a list of supported value comparisons.
     *
     * **Note:** Multiple values can be checked by combining several matchers
     * using `_.overSome`
     *
     * @static
     * @memberOf _
     * @since 3.2.0
     * @category Util
     * @param {Array|string} path The path of the property to get.
     * @param {*} srcValue The value to match.
     * @returns {Function} Returns the new spec function.
     * @example
     *
     * var objects = [
     *   { 'a': 1, 'b': 2, 'c': 3 },
     *   { 'a': 4, 'b': 5, 'c': 6 }
     * ];
     *
     * _.find(objects, _.matchesProperty('a', 4));
     * // => { 'a': 4, 'b': 5, 'c': 6 }
     *
     * // Checking for several possible values
     * _.filter(objects, _.overSome([_.matchesProperty('a', 1), _.matchesProperty('a', 4)]));
     * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
     */
    function matchesProperty(path, srcValue) {
      return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
    }

    /**
     * Creates a function that invokes the method at `path` of a given object.
     * Any additional arguments are provided to the invoked method.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Util
     * @param {Array|string} path The path of the method to invoke.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {Function} Returns the new invoker function.
     * @example
     *
     * var objects = [
     *   { 'a': { 'b': _.constant(2) } },
     *   { 'a': { 'b': _.constant(1) } }
     * ];
     *
     * _.map(objects, _.method('a.b'));
     * // => [2, 1]
     *
     * _.map(objects, _.method(['a', 'b']));
     * // => [2, 1]
     */
    var method = baseRest(function(path, args) {
      return function(object) {
        return baseInvoke(object, path, args);
      };
    });

    /**
     * The opposite of `_.method`; this method creates a function that invokes
     * the method at a given path of `object`. Any additional arguments are
     * provided to the invoked method.
     *
     * @static
     * @memberOf _
     * @since 3.7.0
     * @category Util
     * @param {Object} object The object to query.
     * @param {...*} [args] The arguments to invoke the method with.
     * @returns {Function} Returns the new invoker function.
     * @example
     *
     * var array = _.times(3, _.constant),
     *     object = { 'a': array, 'b': array, 'c': array };
     *
     * _.map(['a[2]', 'c[0]'], _.methodOf(object));
     * // => [2, 0]
     *
     * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
     * // => [2, 0]
     */
    var methodOf = baseRest(function(object, args) {
      return function(path) {
        return baseInvoke(object, path, args);
      };
    });

    /**
     * Adds all own enumerable string keyed function properties of a source
     * object to the destination object. If `object` is a function, then methods
     * are added to its prototype as well.
     *
     * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
     * avoid conflicts caused by modifying the original.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {Function|Object} [object=lodash] The destination object.
     * @param {Object} source The object of functions to add.
     * @param {Object} [options={}] The options object.
     * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
     * @returns {Function|Object} Returns `object`.
     * @example
     *
     * function vowels(string) {
     *   return _.filter(string, function(v) {
     *     return /[aeiou]/i.test(v);
     *   });
     * }
     *
     * _.mixin({ 'vowels': vowels });
     * _.vowels('fred');
     * // => ['e']
     *
     * _('fred').vowels().value();
     * // => ['e']
     *
     * _.mixin({ 'vowels': vowels }, { 'chain': false });
     * _('fred').vowels();
     * // => ['e']
     */
    function mixin(object, source, options) {
      var props = keys(source),
          methodNames = baseFunctions(source, props);

      if (options == null &&
          !(isObject(source) && (methodNames.length || !props.length))) {
        options = source;
        source = object;
        object = this;
        methodNames = baseFunctions(source, keys(source));
      }
      var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
          isFunc = isFunction(object);

      arrayEach(methodNames, function(methodName) {
        var func = source[methodName];
        object[methodName] = func;
        if (isFunc) {
          object.prototype[methodName] = function() {
            var chainAll = this.__chain__;
            if (chain || chainAll) {
              var result = object(this.__wrapped__),
                  actions = result.__actions__ = copyArray(this.__actions__);

              actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
              result.__chain__ = chainAll;
              return result;
            }
            return func.apply(object, arrayPush([this.value()], arguments));
          };
        }
      });

      return object;
    }

    /**
     * Reverts the `_` variable to its previous value and returns a reference to
     * the `lodash` function.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @returns {Function} Returns the `lodash` function.
     * @example
     *
     * var lodash = _.noConflict();
     */
    function noConflict() {
      if (root._ === this) {
        root._ = oldDash;
      }
      return this;
    }

    /**
     * This method returns `undefined`.
     *
     * @static
     * @memberOf _
     * @since 2.3.0
     * @category Util
     * @example
     *
     * _.times(2, _.noop);
     * // => [undefined, undefined]
     */
    function noop() {
      // No operation performed.
    }

    /**
     * Creates a function that gets the argument at index `n`. If `n` is negative,
     * the nth argument from the end is returned.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {number} [n=0] The index of the argument to return.
     * @returns {Function} Returns the new pass-thru function.
     * @example
     *
     * var func = _.nthArg(1);
     * func('a', 'b', 'c', 'd');
     * // => 'b'
     *
     * var func = _.nthArg(-2);
     * func('a', 'b', 'c', 'd');
     * // => 'c'
     */
    function nthArg(n) {
      n = toInteger(n);
      return baseRest(function(args) {
        return baseNth(args, n);
      });
    }

    /**
     * Creates a function that invokes `iteratees` with the arguments it receives
     * and returns their results.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [iteratees=[_.identity]]
     *  The iteratees to invoke.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.over([Math.max, Math.min]);
     *
     * func(1, 2, 3, 4);
     * // => [4, 1]
     */
    var over = createOver(arrayMap);

    /**
     * Creates a function that checks if **all** of the `predicates` return
     * truthy when invoked with the arguments it receives.
     *
     * Following shorthands are possible for providing predicates.
     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [predicates=[_.identity]]
     *  The predicates to check.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.overEvery([Boolean, isFinite]);
     *
     * func('1');
     * // => true
     *
     * func(null);
     * // => false
     *
     * func(NaN);
     * // => false
     */
    var overEvery = createOver(arrayEvery);

    /**
     * Creates a function that checks if **any** of the `predicates` return
     * truthy when invoked with the arguments it receives.
     *
     * Following shorthands are possible for providing predicates.
     * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
     * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {...(Function|Function[])} [predicates=[_.identity]]
     *  The predicates to check.
     * @returns {Function} Returns the new function.
     * @example
     *
     * var func = _.overSome([Boolean, isFinite]);
     *
     * func('1');
     * // => true
     *
     * func(null);
     * // => true
     *
     * func(NaN);
     * // => false
     *
     * var matchesFunc = _.overSome([{ 'a': 1 }, { 'a': 2 }])
     * var matchesPropertyFunc = _.overSome([['a', 1], ['a', 2]])
     */
    var overSome = createOver(arraySome);

    /**
     * Creates a function that returns the value at `path` of a given object.
     *
     * @static
     * @memberOf _
     * @since 2.4.0
     * @category Util
     * @param {Array|string} path The path of the property to get.
     * @returns {Function} Returns the new accessor function.
     * @example
     *
     * var objects = [
     *   { 'a': { 'b': 2 } },
     *   { 'a': { 'b': 1 } }
     * ];
     *
     * _.map(objects, _.property('a.b'));
     * // => [2, 1]
     *
     * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
     * // => [1, 2]
     */
    function property(path) {
      return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
    }

    /**
     * The opposite of `_.property`; this method creates a function that returns
     * the value at a given path of `object`.
     *
     * @static
     * @memberOf _
     * @since 3.0.0
     * @category Util
     * @param {Object} object The object to query.
     * @returns {Function} Returns the new accessor function.
     * @example
     *
     * var array = [0, 1, 2],
     *     object = { 'a': array, 'b': array, 'c': array };
     *
     * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
     * // => [2, 0]
     *
     * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
     * // => [2, 0]
     */
    function propertyOf(object) {
      return function(path) {
        return object == null ? undefined : baseGet(object, path);
      };
    }

    /**
     * Creates an array of numbers (positive and/or negative) progressing from
     * `start` up to, but not including, `end`. A step of `-1` is used if a negative
     * `start` is specified without an `end` or `step`. If `end` is not specified,
     * it's set to `start` with `start` then set to `0`.
     *
     * **Note:** JavaScript follows the IEEE-754 standard for resolving
     * floating-point values which can produce unexpected results.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @param {number} [step=1] The value to increment or decrement by.
     * @returns {Array} Returns the range of numbers.
     * @see _.inRange, _.rangeRight
     * @example
     *
     * _.range(4);
     * // => [0, 1, 2, 3]
     *
     * _.range(-4);
     * // => [0, -1, -2, -3]
     *
     * _.range(1, 5);
     * // => [1, 2, 3, 4]
     *
     * _.range(0, 20, 5);
     * // => [0, 5, 10, 15]
     *
     * _.range(0, -4, -1);
     * // => [0, -1, -2, -3]
     *
     * _.range(1, 4, 0);
     * // => [1, 1, 1]
     *
     * _.range(0);
     * // => []
     */
    var range = createRange();

    /**
     * This method is like `_.range` except that it populates values in
     * descending order.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {number} [start=0] The start of the range.
     * @param {number} end The end of the range.
     * @param {number} [step=1] The value to increment or decrement by.
     * @returns {Array} Returns the range of numbers.
     * @see _.inRange, _.range
     * @example
     *
     * _.rangeRight(4);
     * // => [3, 2, 1, 0]
     *
     * _.rangeRight(-4);
     * // => [-3, -2, -1, 0]
     *
     * _.rangeRight(1, 5);
     * // => [4, 3, 2, 1]
     *
     * _.rangeRight(0, 20, 5);
     * // => [15, 10, 5, 0]
     *
     * _.rangeRight(0, -4, -1);
     * // => [-3, -2, -1, 0]
     *
     * _.rangeRight(1, 4, 0);
     * // => [1, 1, 1]
     *
     * _.rangeRight(0);
     * // => []
     */
    var rangeRight = createRange(true);

    /**
     * This method returns a new empty array.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {Array} Returns the new empty array.
     * @example
     *
     * var arrays = _.times(2, _.stubArray);
     *
     * console.log(arrays);
     * // => [[], []]
     *
     * console.log(arrays[0] === arrays[1]);
     * // => false
     */
    function stubArray() {
      return [];
    }

    /**
     * This method returns `false`.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {boolean} Returns `false`.
     * @example
     *
     * _.times(2, _.stubFalse);
     * // => [false, false]
     */
    function stubFalse() {
      return false;
    }

    /**
     * This method returns a new empty object.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {Object} Returns the new empty object.
     * @example
     *
     * var objects = _.times(2, _.stubObject);
     *
     * console.log(objects);
     * // => [{}, {}]
     *
     * console.log(objects[0] === objects[1]);
     * // => false
     */
    function stubObject() {
      return {};
    }

    /**
     * This method returns an empty string.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {string} Returns the empty string.
     * @example
     *
     * _.times(2, _.stubString);
     * // => ['', '']
     */
    function stubString() {
      return '';
    }

    /**
     * This method returns `true`.
     *
     * @static
     * @memberOf _
     * @since 4.13.0
     * @category Util
     * @returns {boolean} Returns `true`.
     * @example
     *
     * _.times(2, _.stubTrue);
     * // => [true, true]
     */
    function stubTrue() {
      return true;
    }

    /**
     * Invokes the iteratee `n` times, returning an array of the results of
     * each invocation. The iteratee is invoked with one argument; (index).
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {number} n The number of times to invoke `iteratee`.
     * @param {Function} [iteratee=_.identity] The function invoked per iteration.
     * @returns {Array} Returns the array of results.
     * @example
     *
     * _.times(3, String);
     * // => ['0', '1', '2']
     *
     *  _.times(4, _.constant(0));
     * // => [0, 0, 0, 0]
     */
    function times(n, iteratee) {
      n = toInteger(n);
      if (n < 1 || n > MAX_SAFE_INTEGER) {
        return [];
      }
      var index = MAX_ARRAY_LENGTH,
          length = nativeMin(n, MAX_ARRAY_LENGTH);

      iteratee = getIteratee(iteratee);
      n -= MAX_ARRAY_LENGTH;

      var result = baseTimes(length, iteratee);
      while (++index < n) {
        iteratee(index);
      }
      return result;
    }

    /**
     * Converts `value` to a property path array.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Util
     * @param {*} value The value to convert.
     * @returns {Array} Returns the new property path array.
     * @example
     *
     * _.toPath('a.b.c');
     * // => ['a', 'b', 'c']
     *
     * _.toPath('a[0].b.c');
     * // => ['a', '0', 'b', 'c']
     */
    function toPath(value) {
      if (isArray(value)) {
        return arrayMap(value, toKey);
      }
      return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
    }

    /**
     * Generates a unique ID. If `prefix` is given, the ID is appended to it.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Util
     * @param {string} [prefix=''] The value to prefix the ID with.
     * @returns {string} Returns the unique ID.
     * @example
     *
     * _.uniqueId('contact_');
     * // => 'contact_104'
     *
     * _.uniqueId();
     * // => '105'
     */
    function uniqueId(prefix) {
      var id = ++idCounter;
      return toString(prefix) + id;
    }

    /*------------------------------------------------------------------------*/

    /**
     * Adds two numbers.
     *
     * @static
     * @memberOf _
     * @since 3.4.0
     * @category Math
     * @param {number} augend The first number in an addition.
     * @param {number} addend The second number in an addition.
     * @returns {number} Returns the total.
     * @example
     *
     * _.add(6, 4);
     * // => 10
     */
    var add = createMathOperation(function(augend, addend) {
      return augend + addend;
    }, 0);

    /**
     * Computes `number` rounded up to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round up.
     * @param {number} [precision=0] The precision to round up to.
     * @returns {number} Returns the rounded up number.
     * @example
     *
     * _.ceil(4.006);
     * // => 5
     *
     * _.ceil(6.004, 2);
     * // => 6.01
     *
     * _.ceil(6040, -2);
     * // => 6100
     */
    var ceil = createRound('ceil');

    /**
     * Divide two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {number} dividend The first number in a division.
     * @param {number} divisor The second number in a division.
     * @returns {number} Returns the quotient.
     * @example
     *
     * _.divide(6, 4);
     * // => 1.5
     */
    var divide = createMathOperation(function(dividend, divisor) {
      return dividend / divisor;
    }, 1);

    /**
     * Computes `number` rounded down to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round down.
     * @param {number} [precision=0] The precision to round down to.
     * @returns {number} Returns the rounded down number.
     * @example
     *
     * _.floor(4.006);
     * // => 4
     *
     * _.floor(0.046, 2);
     * // => 0.04
     *
     * _.floor(4060, -2);
     * // => 4000
     */
    var floor = createRound('floor');

    /**
     * Computes the maximum value of `array`. If `array` is empty or falsey,
     * `undefined` is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the maximum value.
     * @example
     *
     * _.max([4, 2, 8, 6]);
     * // => 8
     *
     * _.max([]);
     * // => undefined
     */
    function max(array) {
      return (array && array.length)
        ? baseExtremum(array, identity, baseGt)
        : undefined;
    }

    /**
     * This method is like `_.max` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * the value is ranked. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {*} Returns the maximum value.
     * @example
     *
     * var objects = [{ 'n': 1 }, { 'n': 2 }];
     *
     * _.maxBy(objects, function(o) { return o.n; });
     * // => { 'n': 2 }
     *
     * // The `_.property` iteratee shorthand.
     * _.maxBy(objects, 'n');
     * // => { 'n': 2 }
     */
    function maxBy(array, iteratee) {
      return (array && array.length)
        ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
        : undefined;
    }

    /**
     * Computes the mean of the values in `array`.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {number} Returns the mean.
     * @example
     *
     * _.mean([4, 2, 8, 6]);
     * // => 5
     */
    function mean(array) {
      return baseMean(array, identity);
    }

    /**
     * This method is like `_.mean` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the value to be averaged.
     * The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the mean.
     * @example
     *
     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
     *
     * _.meanBy(objects, function(o) { return o.n; });
     * // => 5
     *
     * // The `_.property` iteratee shorthand.
     * _.meanBy(objects, 'n');
     * // => 5
     */
    function meanBy(array, iteratee) {
      return baseMean(array, getIteratee(iteratee, 2));
    }

    /**
     * Computes the minimum value of `array`. If `array` is empty or falsey,
     * `undefined` is returned.
     *
     * @static
     * @since 0.1.0
     * @memberOf _
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {*} Returns the minimum value.
     * @example
     *
     * _.min([4, 2, 8, 6]);
     * // => 2
     *
     * _.min([]);
     * // => undefined
     */
    function min(array) {
      return (array && array.length)
        ? baseExtremum(array, identity, baseLt)
        : undefined;
    }

    /**
     * This method is like `_.min` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the criterion by which
     * the value is ranked. The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {*} Returns the minimum value.
     * @example
     *
     * var objects = [{ 'n': 1 }, { 'n': 2 }];
     *
     * _.minBy(objects, function(o) { return o.n; });
     * // => { 'n': 1 }
     *
     * // The `_.property` iteratee shorthand.
     * _.minBy(objects, 'n');
     * // => { 'n': 1 }
     */
    function minBy(array, iteratee) {
      return (array && array.length)
        ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
        : undefined;
    }

    /**
     * Multiply two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.7.0
     * @category Math
     * @param {number} multiplier The first number in a multiplication.
     * @param {number} multiplicand The second number in a multiplication.
     * @returns {number} Returns the product.
     * @example
     *
     * _.multiply(6, 4);
     * // => 24
     */
    var multiply = createMathOperation(function(multiplier, multiplicand) {
      return multiplier * multiplicand;
    }, 1);

    /**
     * Computes `number` rounded to `precision`.
     *
     * @static
     * @memberOf _
     * @since 3.10.0
     * @category Math
     * @param {number} number The number to round.
     * @param {number} [precision=0] The precision to round to.
     * @returns {number} Returns the rounded number.
     * @example
     *
     * _.round(4.006);
     * // => 4
     *
     * _.round(4.006, 2);
     * // => 4.01
     *
     * _.round(4060, -2);
     * // => 4100
     */
    var round = createRound('round');

    /**
     * Subtract two numbers.
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {number} minuend The first number in a subtraction.
     * @param {number} subtrahend The second number in a subtraction.
     * @returns {number} Returns the difference.
     * @example
     *
     * _.subtract(6, 4);
     * // => 2
     */
    var subtract = createMathOperation(function(minuend, subtrahend) {
      return minuend - subtrahend;
    }, 0);

    /**
     * Computes the sum of the values in `array`.
     *
     * @static
     * @memberOf _
     * @since 3.4.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @returns {number} Returns the sum.
     * @example
     *
     * _.sum([4, 2, 8, 6]);
     * // => 20
     */
    function sum(array) {
      return (array && array.length)
        ? baseSum(array, identity)
        : 0;
    }

    /**
     * This method is like `_.sum` except that it accepts `iteratee` which is
     * invoked for each element in `array` to generate the value to be summed.
     * The iteratee is invoked with one argument: (value).
     *
     * @static
     * @memberOf _
     * @since 4.0.0
     * @category Math
     * @param {Array} array The array to iterate over.
     * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
     * @returns {number} Returns the sum.
     * @example
     *
     * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
     *
     * _.sumBy(objects, function(o) { return o.n; });
     * // => 20
     *
     * // The `_.property` iteratee shorthand.
     * _.sumBy(objects, 'n');
     * // => 20
     */
    function sumBy(array, iteratee) {
      return (array && array.length)
        ? baseSum(array, getIteratee(iteratee, 2))
        : 0;
    }

    /*------------------------------------------------------------------------*/

    // Add methods that return wrapped values in chain sequences.
    lodash.after = after;
    lodash.ary = ary;
    lodash.assign = assign;
    lodash.assignIn = assignIn;
    lodash.assignInWith = assignInWith;
    lodash.assignWith = assignWith;
    lodash.at = at;
    lodash.before = before;
    lodash.bind = bind;
    lodash.bindAll = bindAll;
    lodash.bindKey = bindKey;
    lodash.castArray = castArray;
    lodash.chain = chain;
    lodash.chunk = chunk;
    lodash.compact = compact;
    lodash.concat = concat;
    lodash.cond = cond;
    lodash.conforms = conforms;
    lodash.constant = constant;
    lodash.countBy = countBy;
    lodash.create = create;
    lodash.curry = curry;
    lodash.curryRight = curryRight;
    lodash.debounce = debounce;
    lodash.defaults = defaults;
    lodash.defaultsDeep = defaultsDeep;
    lodash.defer = defer;
    lodash.delay = delay;
    lodash.difference = difference;
    lodash.differenceBy = differenceBy;
    lodash.differenceWith = differenceWith;
    lodash.drop = drop;
    lodash.dropRight = dropRight;
    lodash.dropRightWhile = dropRightWhile;
    lodash.dropWhile = dropWhile;
    lodash.fill = fill;
    lodash.filter = filter;
    lodash.flatMap = flatMap;
    lodash.flatMapDeep = flatMapDeep;
    lodash.flatMapDepth = flatMapDepth;
    lodash.flatten = flatten;
    lodash.flattenDeep = flattenDeep;
    lodash.flattenDepth = flattenDepth;
    lodash.flip = flip;
    lodash.flow = flow;
    lodash.flowRight = flowRight;
    lodash.fromPairs = fromPairs;
    lodash.functions = functions;
    lodash.functionsIn = functionsIn;
    lodash.groupBy = groupBy;
    lodash.initial = initial;
    lodash.intersection = intersection;
    lodash.intersectionBy = intersectionBy;
    lodash.intersectionWith = intersectionWith;
    lodash.invert = invert;
    lodash.invertBy = invertBy;
    lodash.invokeMap = invokeMap;
    lodash.iteratee = iteratee;
    lodash.keyBy = keyBy;
    lodash.keys = keys;
    lodash.keysIn = keysIn;
    lodash.map = map;
    lodash.mapKeys = mapKeys;
    lodash.mapValues = mapValues;
    lodash.matches = matches;
    lodash.matchesProperty = matchesProperty;
    lodash.memoize = memoize;
    lodash.merge = merge;
    lodash.mergeWith = mergeWith;
    lodash.method = method;
    lodash.methodOf = methodOf;
    lodash.mixin = mixin;
    lodash.negate = negate;
    lodash.nthArg = nthArg;
    lodash.omit = omit;
    lodash.omitBy = omitBy;
    lodash.once = once;
    lodash.orderBy = orderBy;
    lodash.over = over;
    lodash.overArgs = overArgs;
    lodash.overEvery = overEvery;
    lodash.overSome = overSome;
    lodash.partial = partial;
    lodash.partialRight = partialRight;
    lodash.partition = partition;
    lodash.pick = pick;
    lodash.pickBy = pickBy;
    lodash.property = property;
    lodash.propertyOf = propertyOf;
    lodash.pull = pull;
    lodash.pullAll = pullAll;
    lodash.pullAllBy = pullAllBy;
    lodash.pullAllWith = pullAllWith;
    lodash.pullAt = pullAt;
    lodash.range = range;
    lodash.rangeRight = rangeRight;
    lodash.rearg = rearg;
    lodash.reject = reject;
    lodash.remove = remove;
    lodash.rest = rest;
    lodash.reverse = reverse;
    lodash.sampleSize = sampleSize;
    lodash.set = set;
    lodash.setWith = setWith;
    lodash.shuffle = shuffle;
    lodash.slice = slice;
    lodash.sortBy = sortBy;
    lodash.sortedUniq = sortedUniq;
    lodash.sortedUniqBy = sortedUniqBy;
    lodash.split = split;
    lodash.spread = spread;
    lodash.tail = tail;
    lodash.take = take;
    lodash.takeRight = takeRight;
    lodash.takeRightWhile = takeRightWhile;
    lodash.takeWhile = takeWhile;
    lodash.tap = tap;
    lodash.throttle = throttle;
    lodash.thru = thru;
    lodash.toArray = toArray;
    lodash.toPairs = toPairs;
    lodash.toPairsIn = toPairsIn;
    lodash.toPath = toPath;
    lodash.toPlainObject = toPlainObject;
    lodash.transform = transform;
    lodash.unary = unary;
    lodash.union = union;
    lodash.unionBy = unionBy;
    lodash.unionWith = unionWith;
    lodash.uniq = uniq;
    lodash.uniqBy = uniqBy;
    lodash.uniqWith = uniqWith;
    lodash.unset = unset;
    lodash.unzip = unzip;
    lodash.unzipWith = unzipWith;
    lodash.update = update;
    lodash.updateWith = updateWith;
    lodash.values = values;
    lodash.valuesIn = valuesIn;
    lodash.without = without;
    lodash.words = words;
    lodash.wrap = wrap;
    lodash.xor = xor;
    lodash.xorBy = xorBy;
    lodash.xorWith = xorWith;
    lodash.zip = zip;
    lodash.zipObject = zipObject;
    lodash.zipObjectDeep = zipObjectDeep;
    lodash.zipWith = zipWith;

    // Add aliases.
    lodash.entries = toPairs;
    lodash.entriesIn = toPairsIn;
    lodash.extend = assignIn;
    lodash.extendWith = assignInWith;

    // Add methods to `lodash.prototype`.
    mixin(lodash, lodash);

    /*------------------------------------------------------------------------*/

    // Add methods that return unwrapped values in chain sequences.
    lodash.add = add;
    lodash.attempt = attempt;
    lodash.camelCase = camelCase;
    lodash.capitalize = capitalize;
    lodash.ceil = ceil;
    lodash.clamp = clamp;
    lodash.clone = clone;
    lodash.cloneDeep = cloneDeep;
    lodash.cloneDeepWith = cloneDeepWith;
    lodash.cloneWith = cloneWith;
    lodash.conformsTo = conformsTo;
    lodash.deburr = deburr;
    lodash.defaultTo = defaultTo;
    lodash.divide = divide;
    lodash.endsWith = endsWith;
    lodash.eq = eq;
    lodash.escape = escape;
    lodash.escapeRegExp = escapeRegExp;
    lodash.every = every;
    lodash.find = find;
    lodash.findIndex = findIndex;
    lodash.findKey = findKey;
    lodash.findLast = findLast;
    lodash.findLastIndex = findLastIndex;
    lodash.findLastKey = findLastKey;
    lodash.floor = floor;
    lodash.forEach = forEach;
    lodash.forEachRight = forEachRight;
    lodash.forIn = forIn;
    lodash.forInRight = forInRight;
    lodash.forOwn = forOwn;
    lodash.forOwnRight = forOwnRight;
    lodash.get = get;
    lodash.gt = gt;
    lodash.gte = gte;
    lodash.has = has;
    lodash.hasIn = hasIn;
    lodash.head = head;
    lodash.identity = identity;
    lodash.includes = includes;
    lodash.indexOf = indexOf;
    lodash.inRange = inRange;
    lodash.invoke = invoke;
    lodash.isArguments = isArguments;
    lodash.isArray = isArray;
    lodash.isArrayBuffer = isArrayBuffer;
    lodash.isArrayLike = isArrayLike;
    lodash.isArrayLikeObject = isArrayLikeObject;
    lodash.isBoolean = isBoolean;
    lodash.isBuffer = isBuffer;
    lodash.isDate = isDate;
    lodash.isElement = isElement;
    lodash.isEmpty = isEmpty;
    lodash.isEqual = isEqual;
    lodash.isEqualWith = isEqualWith;
    lodash.isError = isError;
    lodash.isFinite = isFinite;
    lodash.isFunction = isFunction;
    lodash.isInteger = isInteger;
    lodash.isLength = isLength;
    lodash.isMap = isMap;
    lodash.isMatch = isMatch;
    lodash.isMatchWith = isMatchWith;
    lodash.isNaN = isNaN;
    lodash.isNative = isNative;
    lodash.isNil = isNil;
    lodash.isNull = isNull;
    lodash.isNumber = isNumber;
    lodash.isObject = isObject;
    lodash.isObjectLike = isObjectLike;
    lodash.isPlainObject = isPlainObject;
    lodash.isRegExp = isRegExp;
    lodash.isSafeInteger = isSafeInteger;
    lodash.isSet = isSet;
    lodash.isString = isString;
    lodash.isSymbol = isSymbol;
    lodash.isTypedArray = isTypedArray;
    lodash.isUndefined = isUndefined;
    lodash.isWeakMap = isWeakMap;
    lodash.isWeakSet = isWeakSet;
    lodash.join = join;
    lodash.kebabCase = kebabCase;
    lodash.last = last;
    lodash.lastIndexOf = lastIndexOf;
    lodash.lowerCase = lowerCase;
    lodash.lowerFirst = lowerFirst;
    lodash.lt = lt;
    lodash.lte = lte;
    lodash.max = max;
    lodash.maxBy = maxBy;
    lodash.mean = mean;
    lodash.meanBy = meanBy;
    lodash.min = min;
    lodash.minBy = minBy;
    lodash.stubArray = stubArray;
    lodash.stubFalse = stubFalse;
    lodash.stubObject = stubObject;
    lodash.stubString = stubString;
    lodash.stubTrue = stubTrue;
    lodash.multiply = multiply;
    lodash.nth = nth;
    lodash.noConflict = noConflict;
    lodash.noop = noop;
    lodash.now = now;
    lodash.pad = pad;
    lodash.padEnd = padEnd;
    lodash.padStart = padStart;
    lodash.parseInt = parseInt;
    lodash.random = random;
    lodash.reduce = reduce;
    lodash.reduceRight = reduceRight;
    lodash.repeat = repeat;
    lodash.replace = replace;
    lodash.result = result;
    lodash.round = round;
    lodash.runInContext = runInContext;
    lodash.sample = sample;
    lodash.size = size;
    lodash.snakeCase = snakeCase;
    lodash.some = some;
    lodash.sortedIndex = sortedIndex;
    lodash.sortedIndexBy = sortedIndexBy;
    lodash.sortedIndexOf = sortedIndexOf;
    lodash.sortedLastIndex = sortedLastIndex;
    lodash.sortedLastIndexBy = sortedLastIndexBy;
    lodash.sortedLastIndexOf = sortedLastIndexOf;
    lodash.startCase = startCase;
    lodash.startsWith = startsWith;
    lodash.subtract = subtract;
    lodash.sum = sum;
    lodash.sumBy = sumBy;
    lodash.template = template;
    lodash.times = times;
    lodash.toFinite = toFinite;
    lodash.toInteger = toInteger;
    lodash.toLength = toLength;
    lodash.toLower = toLower;
    lodash.toNumber = toNumber;
    lodash.toSafeInteger = toSafeInteger;
    lodash.toString = toString;
    lodash.toUpper = toUpper;
    lodash.trim = trim;
    lodash.trimEnd = trimEnd;
    lodash.trimStart = trimStart;
    lodash.truncate = truncate;
    lodash.unescape = unescape;
    lodash.uniqueId = uniqueId;
    lodash.upperCase = upperCase;
    lodash.upperFirst = upperFirst;

    // Add aliases.
    lodash.each = forEach;
    lodash.eachRight = forEachRight;
    lodash.first = head;

    mixin(lodash, (function() {
      var source = {};
      baseForOwn(lodash, function(func, methodName) {
        if (!hasOwnProperty.call(lodash.prototype, methodName)) {
          source[methodName] = func;
        }
      });
      return source;
    }()), { 'chain': false });

    /*------------------------------------------------------------------------*/

    /**
     * The semantic version number.
     *
     * @static
     * @memberOf _
     * @type {string}
     */
    lodash.VERSION = VERSION;

    // Assign default placeholders.
    arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
      lodash[methodName].placeholder = lodash;
    });

    // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
    arrayEach(['drop', 'take'], function(methodName, index) {
      LazyWrapper.prototype[methodName] = function(n) {
        n = n === undefined ? 1 : nativeMax(toInteger(n), 0);

        var result = (this.__filtered__ && !index)
          ? new LazyWrapper(this)
          : this.clone();

        if (result.__filtered__) {
          result.__takeCount__ = nativeMin(n, result.__takeCount__);
        } else {
          result.__views__.push({
            'size': nativeMin(n, MAX_ARRAY_LENGTH),
            'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
          });
        }
        return result;
      };

      LazyWrapper.prototype[methodName + 'Right'] = function(n) {
        return this.reverse()[methodName](n).reverse();
      };
    });

    // Add `LazyWrapper` methods that accept an `iteratee` value.
    arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
      var type = index + 1,
          isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;

      LazyWrapper.prototype[methodName] = function(iteratee) {
        var result = this.clone();
        result.__iteratees__.push({
          'iteratee': getIteratee(iteratee, 3),
          'type': type
        });
        result.__filtered__ = result.__filtered__ || isFilter;
        return result;
      };
    });

    // Add `LazyWrapper` methods for `_.head` and `_.last`.
    arrayEach(['head', 'last'], function(methodName, index) {
      var takeName = 'take' + (index ? 'Right' : '');

      LazyWrapper.prototype[methodName] = function() {
        return this[takeName](1).value()[0];
      };
    });

    // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
    arrayEach(['initial', 'tail'], function(methodName, index) {
      var dropName = 'drop' + (index ? '' : 'Right');

      LazyWrapper.prototype[methodName] = function() {
        return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
      };
    });

    LazyWrapper.prototype.compact = function() {
      return this.filter(identity);
    };

    LazyWrapper.prototype.find = function(predicate) {
      return this.filter(predicate).head();
    };

    LazyWrapper.prototype.findLast = function(predicate) {
      return this.reverse().find(predicate);
    };

    LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
      if (typeof path == 'function') {
        return new LazyWrapper(this);
      }
      return this.map(function(value) {
        return baseInvoke(value, path, args);
      });
    });

    LazyWrapper.prototype.reject = function(predicate) {
      return this.filter(negate(getIteratee(predicate)));
    };

    LazyWrapper.prototype.slice = function(start, end) {
      start = toInteger(start);

      var result = this;
      if (result.__filtered__ && (start > 0 || end < 0)) {
        return new LazyWrapper(result);
      }
      if (start < 0) {
        result = result.takeRight(-start);
      } else if (start) {
        result = result.drop(start);
      }
      if (end !== undefined) {
        end = toInteger(end);
        result = end < 0 ? result.dropRight(-end) : result.take(end - start);
      }
      return result;
    };

    LazyWrapper.prototype.takeRightWhile = function(predicate) {
      return this.reverse().takeWhile(predicate).reverse();
    };

    LazyWrapper.prototype.toArray = function() {
      return this.take(MAX_ARRAY_LENGTH);
    };

    // Add `LazyWrapper` methods to `lodash.prototype`.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
          isTaker = /^(?:head|last)$/.test(methodName),
          lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
          retUnwrapped = isTaker || /^find/.test(methodName);

      if (!lodashFunc) {
        return;
      }
      lodash.prototype[methodName] = function() {
        var value = this.__wrapped__,
            args = isTaker ? [1] : arguments,
            isLazy = value instanceof LazyWrapper,
            iteratee = args[0],
            useLazy = isLazy || isArray(value);

        var interceptor = function(value) {
          var result = lodashFunc.apply(lodash, arrayPush([value], args));
          return (isTaker && chainAll) ? result[0] : result;
        };

        if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
          // Avoid lazy use if the iteratee has a "length" value other than `1`.
          isLazy = useLazy = false;
        }
        var chainAll = this.__chain__,
            isHybrid = !!this.__actions__.length,
            isUnwrapped = retUnwrapped && !chainAll,
            onlyLazy = isLazy && !isHybrid;

        if (!retUnwrapped && useLazy) {
          value = onlyLazy ? value : new LazyWrapper(this);
          var result = func.apply(value, args);
          result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
          return new LodashWrapper(result, chainAll);
        }
        if (isUnwrapped && onlyLazy) {
          return func.apply(this, args);
        }
        result = this.thru(interceptor);
        return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
      };
    });

    // Add `Array` methods to `lodash.prototype`.
    arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
      var func = arrayProto[methodName],
          chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
          retUnwrapped = /^(?:pop|shift)$/.test(methodName);

      lodash.prototype[methodName] = function() {
        var args = arguments;
        if (retUnwrapped && !this.__chain__) {
          var value = this.value();
          return func.apply(isArray(value) ? value : [], args);
        }
        return this[chainName](function(value) {
          return func.apply(isArray(value) ? value : [], args);
        });
      };
    });

    // Map minified method names to their real names.
    baseForOwn(LazyWrapper.prototype, function(func, methodName) {
      var lodashFunc = lodash[methodName];
      if (lodashFunc) {
        var key = lodashFunc.name + '';
        if (!hasOwnProperty.call(realNames, key)) {
          realNames[key] = [];
        }
        realNames[key].push({ 'name': methodName, 'func': lodashFunc });
      }
    });

    realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
      'name': 'wrapper',
      'func': undefined
    }];

    // Add methods to `LazyWrapper`.
    LazyWrapper.prototype.clone = lazyClone;
    LazyWrapper.prototype.reverse = lazyReverse;
    LazyWrapper.prototype.value = lazyValue;

    // Add chain sequence methods to the `lodash` wrapper.
    lodash.prototype.at = wrapperAt;
    lodash.prototype.chain = wrapperChain;
    lodash.prototype.commit = wrapperCommit;
    lodash.prototype.next = wrapperNext;
    lodash.prototype.plant = wrapperPlant;
    lodash.prototype.reverse = wrapperReverse;
    lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;

    // Add lazy aliases.
    lodash.prototype.first = lodash.prototype.head;

    if (symIterator) {
      lodash.prototype[symIterator] = wrapperToIterator;
    }
    return lodash;
  });

  /*--------------------------------------------------------------------------*/

  // Export lodash.
  var _ = runInContext();

  // Some AMD build optimizers, like r.js, check for condition patterns like:
  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
    // Expose Lodash on the global object to prevent errors when Lodash is
    // loaded by a script tag in the presence of an AMD loader.
    // See http://requirejs.org/docs/errors.html#mismatch for more details.
    // Use `_.noConflict` to remove Lodash from the global object.
    root._ = _;

    // Define as an anonymous module so, through path mapping, it can be
    // referenced as the "underscore" module.
    define(function() {
      return _;
    });
  }
  // Check for `exports` after `define` in case a build optimizer adds it.
  else if (freeModule) {
    // Export for Node.js.
    (freeModule.exports = _)._ = _;
    // Export for CommonJS support.
    freeExports._ = _;
  }
  else {
    // Export to the global object.
    root._ = _;
  }
}.call(this));

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],13:[function(require,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;

function drainQueue() {
    if (draining) {
        return;
    }
    draining = true;
    var currentQueue;
    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        var i = -1;
        while (++i < len) {
            currentQueue[i]();
        }
        len = queue.length;
    }
    draining = false;
}
process.nextTick = function (fun) {
    queue.push(fun);
    if (!draining) {
        setTimeout(drainQueue, 0);
    }
};

process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

// TODO(shtylman)
process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],14:[function(require,module,exports){
arguments[4][6][0].apply(exports,arguments)
},{"dup":6}],15:[function(require,module,exports){
arguments[4][7][0].apply(exports,arguments)
},{"dup":7}],16:[function(require,module,exports){
arguments[4][8][0].apply(exports,arguments)
},{"./support/isBuffer":15,"_process":13,"dup":8,"inherits":14}],17:[function(require,module,exports){
/*
 * Lexical analysis and token construction.
 */

"use strict";

var _      = require("lodash");
var events = require("events");
var reg    = require("./reg.js");
var state  = require("./state.js").state;

var unicodeData = require("../data/ascii-identifier-data.js");
var asciiIdentifierStartTable = unicodeData.asciiIdentifierStartTable;
var asciiIdentifierPartTable = unicodeData.asciiIdentifierPartTable;
var nonAsciiIdentifierStartTable = require("../data/non-ascii-identifier-start.js");
var nonAsciiIdentifierPartTable = require("../data/non-ascii-identifier-part-only.js");
// Loading of this module is deferred as an optimization for ES2015 input
var es5IdentifierNames;

// Some of these token types are from JavaScript Parser API
// while others are specific to JSHint parser.
// JS Parser API: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API

var Token = {
  Identifier: 1,
  Punctuator: 2,
  NumericLiteral: 3,
  StringLiteral: 4,
  Comment: 5,
  Keyword: 6,
  RegExp: 9,
  TemplateHead: 10,
  TemplateMiddle: 11,
  TemplateTail: 12,
  NoSubstTemplate: 13
};

var Context = {
  Block: 1,
  Template: 2
};

function isHex(str) {
  return /^[0-9a-fA-F]+$/.test(str);
}

function isHexDigit(str) {
  return str.length === 1 && isHex(str);
}

// Object that handles postponed lexing verifications that checks the parsed
// environment state.

function asyncTrigger() {
  var _checks = [];

  return {
    push: function(fn) {
      _checks.push(fn);
    },

    check: function() {
      for (var check = 0; check < _checks.length; ++check) {
        _checks[check]();
      }

      _checks.splice(0, _checks.length);
    }
  };
}

/*
 * Lexer for JSHint.
 *
 * This object does a char-by-char scan of the provided source code
 * and produces a sequence of tokens.
 *
 *   var lex = new Lexer("var i = 0;");
 *   lex.start();
 *   lex.token(); // returns the next token
 *
 * You have to use the token() method to move the lexer forward
 * but you don't have to use its return value to get tokens. In addition
 * to token() method returning the next token, the Lexer object also
 * emits events.
 *
 *   lex.on("Identifier", function(data) {
 *     if (data.name.indexOf("_") >= 0) {
 *       // Produce a warning.
 *     }
 *   });
 *
 * Note that the token() method returns tokens in a JSLint-compatible
 * format while the event emitter uses a slightly modified version of
 * Mozilla's JavaScript Parser API. Eventually, we will move away from
 * JSLint format.
 */
function Lexer(source) {
  var lines = source;

  if (typeof lines === "string") {
    lines = lines
      .replace(/\r\n/g, "\n")
      .replace(/\r/g, "\n")
      .split("\n");
  }

  // If the first line is a shebang (#!), make it a blank and move on.
  // Shebangs are used by Node scripts.

  if (lines[0] && lines[0].substr(0, 2) === "#!") {
    if (lines[0].indexOf("node") !== -1) {
      state.option.node = true;
    }
    lines[0] = "";
  }

  this.emitter = new events.EventEmitter();
  this.source = source;
  this.setLines(lines);
  this.prereg = true;

  this.line = 0;
  this.char = 1;
  this.from = 1;
  this.input = "";
  this.inComment = false;
  this.context = [];
  this.templateStarts = [];

  for (var i = 0; i < state.option.indent; i += 1) {
    state.tab += " ";
  }
}

Lexer.prototype = {
  _lines: [],

  inContext: function(ctxType) {
    return this.context.length > 0 && this.context[this.context.length - 1].type === ctxType;
  },

  pushContext: function(ctxType) {
    this.context.push({ type: ctxType });
  },

  popContext: function() {
    return this.context.pop();
  },

  currentContext: function() {
    return this.context.length > 0 && this.context[this.context.length - 1];
  },

  getLines: function() {
    this._lines = state.lines;
    return this._lines;
  },

  setLines: function(val) {
    this._lines = val;
    state.lines = this._lines;
  },

  /*
   * Return the next i character without actually moving the
   * char pointer.
   */
  peek: function(i) {
    return this.input.charAt(i || 0);
  },

  /*
   * Move the char pointer forward i times.
   */
  skip: function(i) {
    i = i || 1;
    this.char += i;
    this.input = this.input.slice(i);
  },

  /*
   * Subscribe to a token event. The API for this method is similar
   * Underscore.js i.e. you can subscribe to multiple events with
   * one call:
   *
   *   lex.on("Identifier Number", function(data) {
   *     // ...
   *   });
   */
  on: function(names, listener) {
    names.split(" ").forEach(function(name) {
      this.emitter.on(name, listener);
    }.bind(this));
  },

  /*
   * Trigger a token event. All arguments will be passed to each
   * listener.
   */
  trigger: function() {
    this.emitter.emit.apply(this.emitter, Array.prototype.slice.call(arguments));
  },

  /*
   * Postpone a token event. the checking condition is set as
   * last parameter, and the trigger function is called in a
   * stored callback. To be later called using the check() function
   * by the parser. This avoids parser's peek() to give the lexer
   * a false context.
   */
  triggerAsync: function(type, args, checks, fn) {
    checks.push(function() {
      if (fn()) {
        this.trigger(type, args);
      }
    }.bind(this));
  },

  /*
   * Extract a punctuator out of the next sequence of characters
   * or return 'null' if its not possible.
   *
   * This method's implementation was heavily influenced by the
   * scanPunctuator function in the Esprima parser's source code.
   */
  scanPunctuator: function() {
    var ch1 = this.peek();
    var ch2, ch3, ch4;

    switch (ch1) {
    // Most common single-character punctuators
    case ".":
      if ((/^[0-9]$/).test(this.peek(1))) {
        return null;
      }
      if (this.peek(1) === "." && this.peek(2) === ".") {
        return {
          type: Token.Punctuator,
          value: "..."
        };
      }
      /* falls through */
    case "(":
    case ")":
    case ";":
    case ",":
    case "[":
    case "]":
    case ":":
    case "~":
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A block/object opener
    case "{":
      this.pushContext(Context.Block);
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A block/object closer
    case "}":
      if (this.inContext(Context.Block)) {
        this.popContext();
      }
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // A pound sign (for Node shebangs)
    case "#":
      return {
        type: Token.Punctuator,
        value: ch1
      };

    // We're at the end of input
    case "":
      return null;
    }

    // Peek more characters

    ch2 = this.peek(1);
    ch3 = this.peek(2);

    if (ch1 === "?") {
      // Optional chaining
      if (ch2 === "." && !reg.decimalDigit.test(ch3)) {
        return {
          type: Token.Punctuator,
          value: "?."
        };
      }

      return {
        type: Token.Punctuator,
        value: ch2 === "?" ? "??" : "?"
      };
    }

    ch4 = this.peek(3);

    // 4-character punctuator: >>>=

    if (ch1 === ">" && ch2 === ">" && ch3 === ">" && ch4 === "=") {
      return {
        type: Token.Punctuator,
        value: ">>>="
      };
    }

    // 3-character punctuators: === !== >>> <<= >>=

    if (ch1 === "=" && ch2 === "=" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "==="
      };
    }

    if (ch1 === "!" && ch2 === "=" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "!=="
      };
    }

    if (ch1 === ">" && ch2 === ">" && ch3 === ">") {
      return {
        type: Token.Punctuator,
        value: ">>>"
      };
    }

    if (ch1 === "<" && ch2 === "<" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: "<<="
      };
    }

    if (ch1 === ">" && ch2 === ">" && ch3 === "=") {
      return {
        type: Token.Punctuator,
        value: ">>="
      };
    }

    // Fat arrow punctuator
    if (ch1 === "=" && ch2 === ">") {
      return {
        type: Token.Punctuator,
        value: ch1 + ch2
      };
    }

    // 2-character punctuators: ++ -- << >> && || **
    if (ch1 === ch2 && ("+-<>&|*".indexOf(ch1) >= 0)) {
      if (ch1 === "*" && ch3 === "=") {
        return {
          type: Token.Punctuator,
          value: ch1 + ch2 + ch3
        };
      }

      return {
        type: Token.Punctuator,
        value: ch1 + ch2
      };
    }

    // <= >= != += -= *= %= &= |= ^= /=
    if ("<>=!+-*%&|^/".indexOf(ch1) >= 0) {
      if (ch2 === "=") {
        return {
          type: Token.Punctuator,
          value: ch1 + ch2
        };
      }

      return {
        type: Token.Punctuator,
        value: ch1
      };
    }

    return null;
  },

  /*
   * Extract a comment out of the next sequence of characters and/or
   * lines or return 'null' if its not possible. Since comments can
   * span across multiple lines this method has to move the char
   * pointer.
   *
   * In addition to normal JavaScript comments (// and /*) this method
   * also recognizes JSHint- and JSLint-specific comments such as
   * /*jshint, /*jslint, /*globals and so on.
   */
  scanComments: function(checks) {
    var ch1 = this.peek();
    var ch2 = this.peek(1);
    var rest = this.input.substr(2);
    var startLine = this.line;
    var startChar = this.char;
    var self = this;

    // Create a comment token object and make sure it
    // has all the data JSHint needs to work with special
    // comments.

    function commentToken(label, body, opt) {
      var special = [
        "jshint", "jshint.unstable", "jslint", "members", "member", "globals",
        "global", "exported"
      ];
      var isSpecial = false;
      var value = label + body;
      var commentType = "plain";
      opt = opt || {};

      if (opt.isMultiline) {
        value += "*/";
      }

      body = body.replace(/\n/g, " ");

      if (label === "/*" && reg.fallsThrough.test(body)) {
        isSpecial = true;
        commentType = "falls through";
      }

      special.forEach(function(str) {
        if (isSpecial) {
          return;
        }

        // Don't recognize any special comments other than jshint for single-line
        // comments. This introduced many problems with legit comments.
        if (label === "//" && str !== "jshint" && str !== "jshint.unstable") {
          return;
        }

        if (body.charAt(str.length) === " " && body.substr(0, str.length) === str) {
          isSpecial = true;
          label = label + str;
          body = body.substr(str.length);
        }

        if (!isSpecial && body.charAt(0) === " " && body.charAt(str.length + 1) === " " &&
          body.substr(1, str.length) === str) {
          isSpecial = true;
          label = label + " " + str;
          body = body.substr(str.length + 1);
        }

        // To handle rarer case when special word is separated from label by
        // multiple spaces or tabs
        var strIndex = body.indexOf(str);
        if (!isSpecial && strIndex >= 0 && body.charAt(strIndex + str.length) === " ") {
          var isAllWhitespace = body.substr(0, strIndex).trim().length === 0;
          if (isAllWhitespace) {
            isSpecial = true;
            body = body.substr(str.length + strIndex);
          }
        }

        if (!isSpecial) {
          return;
        }

        switch (str) {
        case "member":
          commentType = "members";
          break;
        case "global":
          commentType = "globals";
          break;
        default:
          var options = body.split(":").map(function(v) {
            return v.replace(/^\s+/, "").replace(/\s+$/, "");
          });

          if (options.length === 2) {
            switch (options[0]) {
            case "ignore":
              switch (options[1]) {
              case "start":
                self.ignoringLinterErrors = true;
                isSpecial = false;
                break;
              case "end":
                self.ignoringLinterErrors = false;
                isSpecial = false;
                break;
              }
            }
          }

          commentType = str;
        }
      });

      return {
        type: Token.Comment,
        commentType: commentType,
        value: value,
        body: body,
        isSpecial: isSpecial,
        isMalformed: opt.isMalformed || false
      };
    }

    // End of unbegun comment. Raise an error and skip that input.
    if (ch1 === "*" && ch2 === "/") {
      this.trigger("error", {
        code: "E018",
        line: startLine,
        character: startChar
      });

      this.skip(2);
      return null;
    }

    // Comments must start either with // or /*
    if (ch1 !== "/" || (ch2 !== "*" && ch2 !== "/")) {
      return null;
    }

    // One-line comment
    if (ch2 === "/") {
      this.skip(this.input.length); // Skip to the EOL.
      return commentToken("//", rest);
    }

    var body = "";

    /* Multi-line comment */
    if (ch2 === "*") {
      this.inComment = true;
      this.skip(2);

      while (this.peek() !== "*" || this.peek(1) !== "/") {
        if (this.peek() === "") { // End of Line
          body += "\n";

          // If we hit EOF and our comment is still unclosed,
          // trigger an error and end the comment implicitly.
          if (!this.nextLine(checks)) {
            this.trigger("error", {
              code: "E017",
              line: startLine,
              character: startChar
            });

            this.inComment = false;
            return commentToken("/*", body, {
              isMultiline: true,
              isMalformed: true
            });
          }
        } else {
          body += this.peek();
          this.skip();
        }
      }

      this.skip(2);
      this.inComment = false;
      return commentToken("/*", body, { isMultiline: true });
    }
  },

  /*
   * Extract a keyword out of the next sequence of characters or
   * return 'null' if its not possible.
   */
  scanKeyword: function() {
    var result = /^[a-zA-Z_$][a-zA-Z0-9_$]*/.exec(this.input);
    var keywords = [
      "if", "in", "do", "var", "for", "new",
      "try", "let", "this", "else", "case",
      "void", "with", "enum", "while", "break",
      "catch", "throw", "const", "yield", "class",
      "super", "return", "typeof", "delete",
      "switch", "export", "import", "default",
      "finally", "extends", "function", "continue",
      "debugger", "instanceof", "true", "false", "null", "async", "await"
    ];

    if (result && keywords.indexOf(result[0]) >= 0) {
      return {
        type: Token.Keyword,
        value: result[0]
      };
    }

    return null;
  },

  /*
   * Extract a JavaScript identifier out of the next sequence of
   * characters or return 'null' if its not possible.
   */
  scanIdentifier: function(checks) {
    var id = "";
    var index = 0;
    var char, value;

    function isNonAsciiIdentifierStart(code) {
      return nonAsciiIdentifierStartTable.indexOf(code) > -1;
    }

    function isNonAsciiIdentifierPart(code) {
      return isNonAsciiIdentifierStart(code) || nonAsciiIdentifierPartTable.indexOf(code) > -1;
    }

    var readUnicodeEscapeSequence = function() {
      /*jshint validthis:true */
      index += 1;

      if (this.peek(index) !== "u") {
        return null;
      }

      var sequence = this.peek(index + 1) + this.peek(index + 2) +
        this.peek(index + 3) + this.peek(index + 4);
      var code;

      if (isHex(sequence)) {
        code = parseInt(sequence, 16);

        if (asciiIdentifierPartTable[code] || isNonAsciiIdentifierPart(code)) {
          index += 5;
          return "\\u" + sequence;
        }

        return null;
      }

      return null;
    }.bind(this);

    var getIdentifierStart = function() {
      /*jshint validthis:true */
      var chr = this.peek(index);
      var code = chr.charCodeAt(0);

      if (code === 92) {
        return readUnicodeEscapeSequence();
      }

      if (code < 128) {
        if (asciiIdentifierStartTable[code]) {
          index += 1;
          return chr;
        }

        return null;
      }

      if (isNonAsciiIdentifierStart(code)) {
        index += 1;
        return chr;
      }

      return null;
    }.bind(this);

    var getIdentifierPart = function() {
      /*jshint validthis:true */
      var chr = this.peek(index);
      var code = chr.charCodeAt(0);

      if (code === 92) {
        return readUnicodeEscapeSequence();
      }

      if (code < 128) {
        if (asciiIdentifierPartTable[code]) {
          index += 1;
          return chr;
        }

        return null;
      }

      if (isNonAsciiIdentifierPart(code)) {
        index += 1;
        return chr;
      }

      return null;
    }.bind(this);

    function removeEscapeSequences(id) {
      return id.replace(/\\u([0-9a-fA-F]{4})/g, function(m0, codepoint) {
        return String.fromCharCode(parseInt(codepoint, 16));
      });
    }

    char = getIdentifierStart();
    if (char === null) {
      return null;
    }

    id = char;
    for (;;) {
      char = getIdentifierPart();

      if (char === null) {
        break;
      }

      id += char;
    }

    value = removeEscapeSequences(id);

    if (!state.inES6(true)) {
      es5IdentifierNames = require("../data/es5-identifier-names.js");

      if (!es5IdentifierNames.test(value)) {
        this.triggerAsync(
          "warning",
          {
            code: "W119",
            line: this.line,
            character: this.char,
            data: ["unicode 8", "6"]
          },
          checks,
          function() { return true; }
        );
      }
    }

    return {
      type: Token.Identifier,
      value: value,
      text: id,
      tokenLength: id.length
    };
  },

  /*
   * Extract a numeric literal out of the next sequence of
   * characters or return 'null' if its not possible. This method
   * supports all numeric literals described in section 7.8.3
   * of the EcmaScript 5 specification.
   *
   * This method's implementation was heavily influenced by the
   * scanNumericLiteral function in the Esprima parser's source code.
   */
  scanNumericLiteral: function(checks) {
    var index = 0;
    var value = "";
    var length = this.input.length;
    var char = this.peek(index);
    var isAllowedDigit = isDecimalDigit;
    var base = 10;
    var isLegacy = false;
    var isNonOctal = false;

    function isDecimalDigit(str) {
      return (/^[0-9]$/).test(str);
    }

    function isOctalDigit(str) {
      return (/^[0-7]$/).test(str);
    }

    function isNonOctalDigit(str) {
      return str === "8" || str === "9";
    }

    function isBinaryDigit(str) {
      return (/^[01]$/).test(str);
    }

    function isIdentifierStart(ch) {
      return (ch === "$") || (ch === "_") || (ch === "\\") ||
        (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z");
    }

    // Numbers must start either with a decimal digit or a point.

    if (char !== "." && !isDecimalDigit(char)) {
      return null;
    }

    if (char !== ".") {
      value = this.peek(index);
      index += 1;
      char = this.peek(index);

      if (value === "0") {
        // Base-16 numbers.
        if (char === "x" || char === "X") {
          isAllowedDigit = isHexDigit;
          base = 16;

          index += 1;
          value += char;
        }

        // Base-8 numbers.
        if (char === "o" || char === "O") {
          isAllowedDigit = isOctalDigit;
          base = 8;

          if (!state.inES6(true)) {
            this.triggerAsync(
              "warning",
              {
                code: "W119",
                line: this.line,
                character: this.char,
                data: [ "Octal integer literal", "6" ]
              },
              checks,
              function() { return true; }
            );
          }

          index += 1;
          value += char;
        }

        // Base-2 numbers.
        if (char === "b" || char === "B") {
          isAllowedDigit = isBinaryDigit;
          base = 2;

          if (!state.inES6(true)) {
            this.triggerAsync(
              "warning",
              {
                code: "W119",
                line: this.line,
                character: this.char,
                data: [ "Binary integer literal", "6" ]
              },
              checks,
              function() { return true; }
            );
          }

          index += 1;
          value += char;
        }

        // Legacy base-8 numbers.
        if (isOctalDigit(char)) {
          isAllowedDigit = isOctalDigit;
          base = 8;
          isLegacy = true;

        } else if (isDecimalDigit(char)) {
          isNonOctal = true;
        }
      }

      while (index < length) {
        char = this.peek(index);

        if (isLegacy && isNonOctalDigit(char)) {
          base = 10;
          isLegacy = false;
          isNonOctal = true;
          isAllowedDigit = isDecimalDigit;
        }

        if (!isAllowedDigit(char)) {
          break;
        }
        value += char;
        index += 1;
      }

      var isBigInt = this.peek(index) === 'n';

      if (isAllowedDigit !== isDecimalDigit || isBigInt) {
        if (isBigInt) {
          this.triggerAsync(
            "warning",
            {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "BigInt", "11" ]
            },
            checks,
            function() { return !state.inES11(); }
          );

          if (isLegacy || isNonOctal) {
            this.triggerAsync(
              "error",
              {
                code: "E067",
                line: this.line,
                character: this.char,
                data: [value + char]
              },
              checks,
              function() { return true; }
            );
          }

          value += char;
          index += 1;
        } else if (!isLegacy && value.length <= 2) { // 0x
          return {
            type: Token.NumericLiteral,
            value: value,
            isMalformed: true
          };
        }

        if (index < length) {
          char = this.peek(index);
          if (isIdentifierStart(char)) {
            return null;
          }
        }

        return {
          type: Token.NumericLiteral,
          value: value,
          base: base,
          isLegacy: isLegacy,
          isMalformed: false
        };
      }
    }

    // Decimal digits.

    if (char === ".") {
      value += char;
      index += 1;

      while (index < length) {
        char = this.peek(index);
        if (!isDecimalDigit(char)) {
          break;
        }
        value += char;
        index += 1;
      }
    }

    // Exponent part.

    if (char === "e" || char === "E") {
      value += char;
      index += 1;
      char = this.peek(index);

      if (char === "+" || char === "-") {
        value += this.peek(index);
        index += 1;
      }

      char = this.peek(index);
      if (isDecimalDigit(char)) {
        value += char;
        index += 1;

        while (index < length) {
          char = this.peek(index);
          if (!isDecimalDigit(char)) {
            break;
          }
          value += char;
          index += 1;
        }
      } else {
        return null;
      }
    }

    if (index < length) {
      char = this.peek(index);
      if (isIdentifierStart(char)) {
        return null;
      }
    }

    // TODO: Extend this check to other numeric literals
    this.triggerAsync("warning", {
      code: "W045",
      line: this.line,
      character: this.char + value.length,
      data: [ value ]
    }, checks, function() { return !isFinite(value); });

    return {
      type: Token.NumericLiteral,
      value: value,
      base: base,
      isNonOctal: isNonOctal,
      isMalformed: false
    };
  },


  // Assumes previously parsed character was \ (=== '\\') and was not skipped.
  scanEscapeSequence: function(checks) {
    var allowNewLine = false;
    var jump = 1;
    this.skip();
    var char = this.peek();

    switch (char) {
    case "'":
      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\'" ]
      }, checks, function() {return state.jsonMode; });
      break;
    case "b":
      char = "\\b";
      break;
    case "f":
      char = "\\f";
      break;
    case "n":
      char = "\\n";
      break;
    case "r":
      char = "\\r";
      break;
    case "t":
      char = "\\t";
      break;
    case "0":
      char = "\\0";

      // Octal literals fail in strict mode.
      // Check if the number is between 00 and 07.
      var n = parseInt(this.peek(1), 10);
      this.triggerAsync("warning", {
        code: "W115",
        line: this.line,
        character: this.char
      }, checks,
      function() { return n >= 0 && n <= 7 && state.isStrict(); });
      break;
    case "1":
    case "2":
    case "3":
    case "4":
    case "5":
    case "6":
    case "7":
      char = "\\" + char;
      this.triggerAsync("warning", {
        code: "W115",
        line: this.line,
        character: this.char
      }, checks,
      function() { return state.isStrict(); });
      break;
    case "u":
      var sequence = this.input.substr(1, 4);
      var code = parseInt(sequence, 16);
      if (!isHex(sequence)) {
        // This condition unequivocally describes a syntax error.
        // TODO: Re-factor as an "error" (not a "warning").
        this.trigger("warning", {
          code: "W052",
          line: this.line,
          character: this.char,
          data: [ "u" + sequence ]
        });
      }
      char = String.fromCharCode(code);
      jump = 5;
      break;
    case "v":
      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\v" ]
      }, checks, function() { return state.jsonMode; });

      char = "\v";
      break;
    case "x":
      var  x = parseInt(this.input.substr(1, 2), 16);

      this.triggerAsync("warning", {
        code: "W114",
        line: this.line,
        character: this.char,
        data: [ "\\x-" ]
      }, checks, function() { return state.jsonMode; });

      char = String.fromCharCode(x);
      jump = 3;
      break;
    case "\\":
      char = "\\\\";
      break;
    case "/":
      break;
    case "":
      allowNewLine = true;
      char = "";
      break;
    }

    return { char: char, jump: jump, allowNewLine: allowNewLine };
  },

  /*
   * Extract a template literal out of the next sequence of characters
   * and/or lines or return 'null' if its not possible. Since template
   * literals can span across multiple lines, this method has to move
   * the char pointer.
   */
  scanTemplateLiteral: function(checks) {
    var tokenType;
    var value = "";
    var ch;
    var startLine = this.line;
    var startChar = this.char;
    var depth = this.templateStarts.length;

    if (this.peek() === "`") {
      if (!state.inES6(true)) {
        this.triggerAsync(
          "warning",
          {
            code: "W119",
            line: this.line,
            character: this.char,
            data: ["template literal syntax", "6"]
          },
          checks,
          function() { return true; }
        );
      }
      // Template must start with a backtick.
      tokenType = Token.TemplateHead;
      this.templateStarts.push({ line: this.line, char: this.char });
      depth = this.templateStarts.length;
      this.skip(1);
      this.pushContext(Context.Template);
    } else if (this.inContext(Context.Template) && this.peek() === "}") {
      // If we're in a template context, and we have a '}', lex a TemplateMiddle.
      tokenType = Token.TemplateMiddle;
    } else {
      // Go lex something else.
      return null;
    }

    while (this.peek() !== "`") {
      while ((ch = this.peek()) === "") {
        value += "\n";
        if (!this.nextLine(checks)) {
          // Unclosed template literal --- point to the starting "`"
          var startPos = this.templateStarts.pop();
          this.trigger("error", {
            code: "E052",
            line: startPos.line,
            character: startPos.char
          });
          return {
            type: tokenType,
            value: value,
            startLine: startLine,
            startChar: startChar,
            isUnclosed: true,
            depth: depth,
            context: this.popContext()
          };
        }
      }

      if (ch === '$' && this.peek(1) === '{') {
        value += '${';
        this.skip(2);
        return {
          type: tokenType,
          value: value,
          startLine: startLine,
          startChar: startChar,
          isUnclosed: false,
          depth: depth,
          context: this.currentContext()
        };
      } else if (ch === '\\') {
        var escape = this.scanEscapeSequence(checks);
        value += escape.char;
        this.skip(escape.jump);
      } else if (ch !== '`') {
        // Otherwise, append the value and continue.
        value += ch;
        this.skip(1);
      }
    }

    // Final value is either NoSubstTemplate or TemplateTail
    tokenType = tokenType === Token.TemplateHead ? Token.NoSubstTemplate : Token.TemplateTail;
    this.skip(1);
    this.templateStarts.pop();

    return {
      type: tokenType,
      value: value,
      startLine: startLine,
      startChar: startChar,
      isUnclosed: false,
      depth: depth,
      context: this.popContext()
    };
  },

  /*
   * Extract a string out of the next sequence of characters and/or
   * lines or return 'null' if its not possible. Since strings can
   * span across multiple lines this method has to move the char
   * pointer.
   *
   * This method recognizes pseudo-multiline JavaScript strings:
   *
   *   var str = "hello\
   *   world";
   */
  scanStringLiteral: function(checks) {
    /*jshint loopfunc:true */
    var quote = this.peek();

    // String must start with a quote.
    if (quote !== "\"" && quote !== "'") {
      return null;
    }

    // In JSON strings must always use double quotes.
    this.triggerAsync("warning", {
      code: "W108",
      line: this.line,
      character: this.char // +1?
    }, checks, function() { return state.jsonMode && quote !== "\""; });

    var value = "";
    var startLine = this.line;
    var startChar = this.char;
    var allowNewLine = false;

    this.skip();

    while (this.peek() !== quote) {
      if (this.peek() === "") { // End Of Line

        // If an EOL is not preceded by a backslash, show a warning
        // and proceed like it was a legit multi-line string where
        // author simply forgot to escape the newline symbol.
        //
        // Another approach is to implicitly close a string on EOL
        // but it generates too many false positives.

        if (!allowNewLine) {
          // This condition unequivocally describes a syntax error.
          // TODO: Emit error E029 and remove W112.
          this.trigger("warning", {
            code: "W112",
            line: this.line,
            character: this.char
          });
        } else {
          allowNewLine = false;

          // Otherwise show a warning if multistr option was not set.
          // For JSON, show warning no matter what.

          this.triggerAsync("warning", {
            code: "W043",
            line: this.line,
            character: this.char
          }, checks, function() { return !state.option.multistr; });

          this.triggerAsync("warning", {
            code: "W042",
            line: this.line,
            character: this.char
          }, checks, function() { return state.jsonMode && state.option.multistr; });
        }

        // If we get an EOF inside of an unclosed string, show an
        // error and implicitly close it at the EOF point.

        if (!this.nextLine(checks)) {
          return {
            type: Token.StringLiteral,
            value: value,
            startLine: startLine,
            startChar: startChar,
            isUnclosed: true,
            quote: quote
          };
        }

      } else { // Any character other than End Of Line

        allowNewLine = false;
        var char = this.peek();
        var jump = 1; // A length of a jump, after we're done
                      // parsing this character.

        if (char < " ") {
          // Warn about a control character in a string.
          this.triggerAsync(
            "warning",
            {
              code: "W113",
              line: this.line,
              character: this.char,
              data: [ "<non-printable>" ]
            },
            checks,
            function() { return true; }
          );
        }

        // Special treatment for some escaped characters.
        if (char === "\\") {
          var parsed = this.scanEscapeSequence(checks);
          char = parsed.char;
          jump = parsed.jump;
          allowNewLine = parsed.allowNewLine;
        }

        // If char is the empty string, end of the line has been reached. In
        // this case, `this.char` should not be incremented so that warnings
        // and errors reported in the subsequent loop iteration have the
        // correct character column offset.
        if (char !== "") {
          value += char;
          this.skip(jump);
        }
      }
    }

    this.skip();
    return {
      type: Token.StringLiteral,
      value: value,
      startLine: startLine,
      startChar: startChar,
      isUnclosed: false,
      quote: quote
    };
  },

  /*
   * Extract a regular expression out of the next sequence of
   * characters and/or lines or return 'null' if its not possible.
   *
   * This method is platform dependent: it accepts almost any
   * regular expression values but then tries to compile and run
   * them using system's RegExp object. This means that there are
   * rare edge cases where one JavaScript engine complains about
   * your regular expression while others don't.
   */
  scanRegExp: function(checks) {
    var index = 0;
    var length = this.input.length;
    var char = this.peek();
    var value = char;
    var body = "";
    var groupReferences = [];
    var allFlags = "";
    var es5Flags = "";
    var malformed = false;
    var isCharSet = false;
    var isCharSetRange = false;
    var isGroup = false;
    var isQuantifiable = false;
    var hasInvalidQuantifier = false;
    var escapedChars = "";
    var hasUFlag = function() { return allFlags.indexOf("u") > -1; };
    var escapeSequence;
    var groupCount = 0;
    var terminated, malformedDesc;

    var scanRegexpEscapeSequence = function() {
      var next, sequence;
      index += 1;
      char = this.peek(index);

      if (reg.nonzeroDigit.test(char)) {
        sequence = char;
        next = this.peek(index + 1);
        while (reg.nonzeroDigit.test(next) || next === "0") {
          index += 1;
          char = next;
          sequence += char;
          body += char;
          value += char;
          next = this.peek(index + 1);
        }
        groupReferences.push(Number(sequence));
        return sequence;
      }

      escapedChars += char;

      if (char === "u" && this.peek(index + 1) === "{") {
        var x = index + 2;
        sequence = "u{";
        next = this.peek(x);
        while (isHex(next)) {
          sequence += next;
          x += 1;
          next = this.peek(x);
        }

        if (next !== "}") {
          this.triggerAsync(
            "error",
            {
              code: "E016",
              line: this.line,
              character: this.char,
              data: [ "Invalid Unicode escape sequence" ]
            },
            checks,
            hasUFlag
          );
        } else if (sequence.length > 2) {
          sequence += "}";
          body += sequence;
          value += sequence;
          index = x + 1;
          return sequence;
        }
      }

      if (char === "p" || char === "P") {
        var y = index + 2;
        sequence = "";
        next = "";

        if (this.peek(index + 1) === "{") {
          next = this.peek(y);
          while (next && next !== "}") {
            sequence += next;
            y += 1;
            next = this.peek(y);
          }
        }

        // Module loading is intentionally deferred as an optimization for
        // Node.js users who do not use Unicode escape sequences.
        if (!sequence || !require("./validate-unicode-escape-sequence")(sequence)) {
          this.triggerAsync(
            "error",
            {
              code: "E016",
              line: this.line,
              character: this.char,
              data: [ "Invalid Unicode property escape sequence" ]
            },
            checks,
            hasUFlag
          );
        }

        if (sequence) {
          sequence = char + "{" + sequence + "}";
          body += sequence;
          value += sequence;
          index = y + 1;

          if (!state.inES9()) {
            this.triggerAsync(
              "warning",
              {
                code: "W119",
                line: this.line,
                character: this.char,
                data: [ "Unicode property escape", "9" ]
              },
              checks,
              hasUFlag
            );
          }

          return sequence;
        }
      }

      // Unexpected control character
      if (char < " ") {
        malformed = true;
        this.triggerAsync(
          "warning",
          {
            code: "W048",
            line: this.line,
            character: this.char
          },
          checks,
          function() { return true; }
        );
      }

      // Unexpected escaped character
      if (char === "<") {
        malformed = true;
        this.triggerAsync(
          "warning",
          {
            code: "W049",
            line: this.line,
            character: this.char,
            data: [ char ]
          },
          checks,
          function() { return true; }
        );
      } else if (char === "0" && reg.decimalDigit.test(this.peek(index + 1))) {
        this.triggerAsync(
          "error",
          {
            code: "E016",
            line: this.line,
            character: this.char,
            data: [ "Invalid decimal escape sequence" ]
          },
          checks,
          hasUFlag
        );
      }

      index += 1;
      body += char;
      value += char;

      return char;
    }.bind(this);

    var checkQuantifier = function() {
      var lookahead = index;
      var lowerBound = "";
      var upperBound = "";
      var next;

      next = this.peek(lookahead + 1);

      while (reg.decimalDigit.test(next)) {
        lookahead += 1;
        lowerBound += next;
        next = this.peek(lookahead + 1);
      }

      if (!lowerBound) {
        return false;
      }

      if (next === "}") {
        return true;
      }

      if (next !== ",") {
        return false;
      }

      lookahead += 1;
      next = this.peek(lookahead + 1);

      while (reg.decimalDigit.test(next)) {
        lookahead += 1;
        upperBound += next;
        next = this.peek(lookahead + 1);
      }

      if (next !== "}") {
        return false;
      }

      if (upperBound) {
        return Number(lowerBound) <= Number(upperBound);
      }

      return true;
    }.bind(this);

    var translateUFlag = function(body) {
      // The BMP character to use as a replacement for astral symbols when
      // translating an ES6 "u"-flagged pattern to an ES5-compatible
      // approximation.
      // Note: replacing with '\uFFFF' enables false positives in unlikely
      // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid pattern
      // that would not be detected by this substitution.
      var astralSubstitute = "\uFFFF";

      return body
        // Replace every Unicode escape sequence with the equivalent BMP
        // character or a constant ASCII code point in the case of astral
        // symbols. (See the above note on `astralSubstitute` for more
        // information.)
        .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function($0, $1, $2) {
          var codePoint = parseInt($1 || $2, 16);
          var literal;

          if (codePoint > 0x10FFFF) {
            malformed = true;
            this.trigger("error", {
              code: "E016",
              line: this.line,
              character: this.char,
              data: [ char ]
            });

            return;
          }
          literal = String.fromCharCode(codePoint);

          if (reg.regexpSyntaxChars.test(literal)) {
            return $0;
          }

          if (codePoint <= 0xFFFF) {
            return String.fromCharCode(codePoint);
          }
          return astralSubstitute;
        }.bind(this))
        // Replace each paired surrogate with a single ASCII symbol to avoid
        // throwing on regular expressions that are only valid in combination
        // with the "u" flag.
        .replace(
          /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
          astralSubstitute
        );
    }.bind(this);

    // Regular expressions must start with '/'
    if (!this.prereg || char !== "/") {
      return null;
    }

    index += 1;
    terminated = false;

    // Try to get everything in between slashes. A couple of
    // cases aside (see scanRegexpEscapeSequence) we don't really
    // care whether the resulting expression is valid or not.
    // We will check that later using the RegExp object.

    while (index < length) {
      // Because an iteration of this loop may terminate in a number of
      // distinct locations, `isCharSetRange` is re-set at the onset of
      // iteration.
      isCharSetRange &= char === "-";
      char = this.peek(index);
      value += char;
      body += char;

      if (isCharSet) {
        if (char === "]") {
          if (this.peek(index - 1) !== "\\" || this.peek(index - 2) === "\\") {
            isCharSet = false;
          }
        } else if (char === "-") {
          isCharSetRange = true;
        }
      }

      if (char === "\\") {
        escapeSequence = scanRegexpEscapeSequence();

        if (isCharSet && (this.peek(index) === "-" || isCharSetRange) &&
          reg.regexpCharClasses.test(escapeSequence)) {
          this.triggerAsync(
            "error",
            {
              code: "E016",
              line: this.line,
              character: this.char,
              data: [ "Character class used in range" ]
            },
            checks,
            hasUFlag
          );
        }

        continue;
      }

      if (isCharSet) {
        index += 1;
        continue;
      }

      if (char === "{" && !hasInvalidQuantifier) {
        hasInvalidQuantifier = !checkQuantifier();
      }

      if (char === "[") {
        isCharSet = true;
        index += 1;
        continue;
      } else if (char === "(") {
        isGroup = true;

        if (this.peek(index + 1) === "?" &&
          (this.peek(index + 2) === "=" || this.peek(index + 2) === "!")) {
          isQuantifiable = true;
        }
      } else if (char === ")") {
        if (isQuantifiable) {
          isQuantifiable = false;

          if (reg.regexpQuantifiers.test(this.peek(index + 1))) {
            this.triggerAsync(
              "error",
              {
                code: "E016",
                line: this.line,
                character: this.char,
                data: [ "Quantified quantifiable" ]
              },
              checks,
              hasUFlag
            );
          }
        } else {
          groupCount += 1;
        }

        isGroup = false;
      } else if (char === "/") {
        body = body.substr(0, body.length - 1);
        terminated = true;
        index += 1;
        break;
      }

      index += 1;
    }

    // A regular expression that was never closed is an
    // error from which we cannot recover.

    if (!terminated) {
      this.trigger("error", {
        code: "E015",
        line: this.line,
        character: this.from
      });

      return void this.trigger("fatal", {
        line: this.line,
        from: this.from
      });
    }

    // Parse flags (if any).

    while (index < length) {
      char = this.peek(index);
      if (!/[gimyus]/.test(char)) {
        break;
      }
      if (char === "y") {
        if (!state.inES6(true)) {
          this.triggerAsync(
            "warning",
            {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "Sticky RegExp flag", "6" ]
            },
            checks,
            function() { return true; }
          );
        }
      } else if (char === "u") {
        if (!state.inES6(true)) {
          this.triggerAsync(
            "warning",
            {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "Unicode RegExp flag", "6" ]
            },
            checks,
            function() { return true; }
          );
        }

        var hasInvalidEscape = (function(groupReferences, groupCount, escapedChars, reg) {
          var hasInvalidGroup = groupReferences.some(function(groupReference) {
            if (groupReference > groupCount) {
              return true;
            }
          });

          if (hasInvalidGroup) {
            return true;
          }

          return !escapedChars.split("").every(function(escapedChar) {
              return escapedChar === "u" ||
                escapedChar === "/" ||
                escapedChar === "0" ||
                reg.regexpControlEscapes.test(escapedChar) ||
                reg.regexpCharClasses.test(escapedChar) ||
                reg.regexpSyntaxChars.test(escapedChar);
            });
        }(groupReferences, groupCount, escapedChars, reg));

        if (hasInvalidEscape) {
          malformedDesc = "Invalid escape";
        } else if (hasInvalidQuantifier) {
          malformedDesc = "Invalid quantifier";
        }

        body = translateUFlag(body);
      } else if (char === "s") {
        if (!state.inES9()) {
          this.triggerAsync(
            "warning",
            {
              code: "W119",
              line: this.line,
              character: this.char,
              data: [ "DotAll RegExp flag", "9" ]
            },
            checks,
            function() { return true; }
          );
        }
        if (value.indexOf("s") > -1) {
          malformedDesc = "Duplicate RegExp flag";
        }
      } else {
        es5Flags += char;
      }

      if (allFlags.indexOf(char) > -1) {
        malformedDesc = "Duplicate RegExp flag";
      }
      allFlags += char;

      value += char;
      allFlags += char;
      index += 1;
    }

    if (allFlags.indexOf("u") === -1) {
      this.triggerAsync("warning", {
        code: "W147",
        line: this.line,
        character: this.char
      }, checks, function() { return state.option.regexpu; });
    }

    // Check regular expression for correctness.

    try {
      new RegExp(body, es5Flags);
    } catch (err) {
      /**
       * Because JSHint relies on the current engine's RegExp parser to
       * validate RegExp literals, the description (exposed as the "data"
       * property on the error object) is platform dependent.
       */
      malformedDesc = err.message;
    }

    if (malformedDesc) {
      malformed = true;
      this.trigger("error", {
        code: "E016",
        line: this.line,
        character: this.char,
        data: [ malformedDesc ]
      });
    } else if (allFlags.indexOf("s") > -1 && !reg.regexpDot.test(body)) {
      this.trigger("warning", {
        code: "W148",
        line: this.line,
        character: this.char
      });
    }

    return {
      type: Token.RegExp,
      value: value,
      isMalformed: malformed
    };
  },

  /*
   * Scan for any occurrence of non-breaking spaces. Non-breaking spaces
   * can be mistakenly typed on OS X with option-space. Non UTF-8 web
   * pages with non-breaking pages produce syntax errors.
   */
  scanNonBreakingSpaces: function() {
    return state.option.nonbsp ?
      this.input.search(/(\u00A0)/) : -1;
  },

  /*
   * Produce the next raw token or return 'null' if no tokens can be matched.
   * This method skips over all space characters.
   */
  next: function(checks) {
    this.from = this.char;

    // Move to the next non-space character.
    while (reg.whitespace.test(this.peek())) {
      this.from += 1;
      this.skip();
    }

    // Methods that work with multi-line structures and move the
    // character pointer.

    var match = this.scanComments(checks) ||
      this.scanStringLiteral(checks) ||
      this.scanTemplateLiteral(checks);

    if (match) {
      return match;
    }

    // Methods that don't move the character pointer.

    match =
      this.scanRegExp(checks) ||
      this.scanPunctuator() ||
      this.scanKeyword() ||
      this.scanIdentifier(checks) ||
      this.scanNumericLiteral(checks);

    if (match) {
      this.skip(match.tokenLength || match.value.length);
      return match;
    }

    // No token could be matched, give up.

    return null;
  },

  /*
   * Switch to the next line and reset all char pointers. Once
   * switched, this method also checks for other minor warnings.
   */
  nextLine: function(checks) {
    var char;

    if (this.line >= this.getLines().length) {
      return false;
    }

    this.input = this.getLines()[this.line];
    this.line += 1;
    this.char = 1;
    this.from = 1;

    var inputTrimmed = this.input.trim();

    var startsWith = function() {
      return _.some(arguments, function(prefix) {
        return inputTrimmed.indexOf(prefix) === 0;
      });
    };

    var endsWith = function() {
      return _.some(arguments, function(suffix) {
        return inputTrimmed.indexOf(suffix, inputTrimmed.length - suffix.length) !== -1;
      });
    };

    // If we are ignoring linter errors, replace the input with empty string
    // if it doesn't already at least start or end a multi-line comment
    if (this.ignoringLinterErrors === true) {
      if (!startsWith("/*", "//") && !(this.inComment && endsWith("*/"))) {
        this.input = "";
      }
    }

    char = this.scanNonBreakingSpaces();
    if (char >= 0) {
      this.triggerAsync(
        "warning",
        { code: "W125", line: this.line, character: char + 1 },
        checks,
        function() { return true; }
      );
    }

    this.input = this.input.replace(/\t/g, state.tab);

    // If there is a limit on line length, warn when lines get too
    // long.

    if (!this.ignoringLinterErrors && state.option.maxlen &&
      state.option.maxlen < this.input.length) {
      var inComment = this.inComment ||
        startsWith.call(inputTrimmed, "//") ||
        startsWith.call(inputTrimmed, "/*");

      var shouldTriggerError = !inComment || !reg.maxlenException.test(inputTrimmed);

      if (shouldTriggerError) {
        this.triggerAsync(
          "warning",
          { code: "W101", line: this.line, character: this.input.length },
          checks,
          function() { return true; }
        );
      }
    }

    return true;
  },

  /*
   * Produce the next token. This function is called by advance() to get
   * the next token. It returns a token in a JSLint-compatible format.
   */
  token: function() {
    /*jshint loopfunc:true */
    var checks = asyncTrigger();
    var token;

    // Produce a token object.
    var create = function(type, value, isProperty, token) {
      /*jshint validthis:true */
      var obj;

      if (type !== "(endline)" && type !== "(end)") {
        this.prereg = false;
      }

      if (type === "(punctuator)") {
        switch (value) {
        case ".":
        case ")":
        case "~":
        case "#":
        case "]":
        case "}":
        case "++":
        case "--":
          this.prereg = false;
          break;
        default:
          this.prereg = true;
        }

        obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
      }

      if (type === "(identifier)") {
        if (value === "return" || value === "case" || value === "yield" ||
            value === "typeof" || value === "instanceof" || value === "void" ||
            value === "await" || value === "new" || value === "delete" ||
            value === "default" || value === "extends") {
          this.prereg = true;
        }

        if (_.has(state.syntax, value)) {
          obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
        }
      }

      if (type === "(template)" || type === "(template middle)") {
        this.prereg = true;
      }

      if (!obj) {
        obj = Object.create(state.syntax[type]);
      }

      obj.identifier = (type === "(identifier)");
      obj.type = obj.type || type;
      obj.value = value;
      obj.line = this.line;
      obj.character = this.char;
      obj.from = this.from;
      if (obj.identifier && token) obj.raw_text = token.text || token.value;
      if (token && token.startLine && token.startLine !== this.line) {
        obj.startLine = token.startLine;
      }
      if (token && token.context) {
        // Context of current token
        obj.context = token.context;
      }
      if (token && token.depth) {
        // Nested template depth
        obj.depth = token.depth;
      }
      if (token && token.isUnclosed) {
        // Mark token as unclosed string / template literal
        obj.isUnclosed = token.isUnclosed;
      }

      if (isProperty && obj.identifier) {
        obj.isProperty = isProperty;
      }

      obj.check = checks.check;

      return obj;
    }.bind(this);

    for (;;) {
      if (!this.input.length) {
        if (this.nextLine(checks)) {
          return create("(endline)", "");
        }

        if (this.exhausted) {
          return null;
        }

        this.exhausted = true;
        return create("(end)", "");
      }

      token = this.next(checks);

      if (!token) {
        if (this.input.length) {
          // Unexpected character.
          this.trigger("error", {
            code: "E024",
            line: this.line,
            character: this.char,
            data: [ this.peek() ]
          });

          this.input = "";
        }

        continue;
      }

      switch (token.type) {
      case Token.StringLiteral:
        this.triggerAsync("String", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value,
          quote: token.quote
        }, checks, function() { return true; });

        return create("(string)", token.value, null, token);

      case Token.TemplateHead:
        this.trigger("TemplateHead", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template)", token.value, null, token);

      case Token.TemplateMiddle:
        this.trigger("TemplateMiddle", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template middle)", token.value, null, token);

      case Token.TemplateTail:
        this.trigger("TemplateTail", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(template tail)", token.value, null, token);

      case Token.NoSubstTemplate:
        this.trigger("NoSubstTemplate", {
          line: this.line,
          char: this.char,
          from: this.from,
          startLine: token.startLine,
          startChar: token.startChar,
          value: token.value
        });
        return create("(no subst template)", token.value, null, token);

      case Token.Identifier:
        this.triggerAsync("Identifier", {
          line: this.line,
          char: this.char,
          from: this.from,
          name: token.value,
          raw_name: token.text,
          isProperty: state.tokens.curr.id === "."
        }, checks, function() { return true; });

        /* falls through */
      case Token.Keyword:
        return create("(identifier)", token.value, state.tokens.curr.id === ".", token);

      case Token.NumericLiteral:
        if (token.isMalformed) {
          this.trigger("error", {
            code: "E067",
            line: this.line,
            character: this.char,
            data: [ token.value ]
          });
        }

        this.triggerAsync("warning", {
          code: "W114",
          line: this.line,
          character: this.char,
          data: [ "0x-" ]
        }, checks, function() { return token.base === 16 && state.jsonMode; });

        this.triggerAsync("warning", {
          code: "W115",
          line: this.line,
          character: this.char
        }, checks, function() {
          return state.isStrict() && token.base === 8 && token.isLegacy;
        });

        this.triggerAsync("error", {
          code: "E068",
          line: this.line,
          character: this.char
        }, checks, function() {
          return state.isStrict() && token.isNonOctal;
        });

        this.trigger("Number", {
          line: this.line,
          char: this.char,
          from: this.from,
          value: token.value,
          base: token.base,
          isMalformed: token.isMalformed
        });

        return create("(number)", token.value);

      case Token.RegExp:
        return create("(regexp)", token.value);

      case Token.Comment:
        if (token.isSpecial) {
          return {
            id: '(comment)',
            value: token.value,
            body: token.body,
            type: token.commentType,
            isSpecial: token.isSpecial,
            line: this.line,
            character: this.char,
            from: this.from
          };
        }

        break;

      default:
        return create("(punctuator)", token.value);
      }
    }
  }
};

exports.Lexer = Lexer;
exports.Context = Context;

},{"../data/ascii-identifier-data.js":1,"../data/es5-identifier-names.js":2,"../data/non-ascii-identifier-part-only.js":3,"../data/non-ascii-identifier-start.js":4,"./reg.js":22,"./state.js":24,"./validate-unicode-escape-sequence":26,"events":11,"lodash":12}],18:[function(require,module,exports){
"use strict";

var _ = require("lodash");

var errors = {
  // JSHint options
  E001: "Bad {a}option: '{b}'.",
  E002: "Bad option value.",

  // JSHint input
  E003: "Expected a JSON value.",
  E004: "Input is neither a string nor an array of strings.",
  E005: "Input is empty.",
  E006: "Unexpected early end of program.",

  // Strict mode
  E007: "Missing \"use strict\" statement.",
  E008: "Strict violation.",
  E009: "Option 'validthis' can't be used in a global scope.",
  E010: "'with' is not allowed in strict mode.",

  // Constants
  E011: "'{a}' has already been declared.",
  E012: "const '{a}' is initialized to 'undefined'.",
  E013: "Attempting to override '{a}' which is a constant.",

  // Regular expressions
  E014: "A regular expression literal can be confused with '/='.",
  E015: "Unclosed regular expression.",
  E016: "Invalid regular expression.",

  // Tokens
  E017: "Unclosed comment.",
  E018: "Unbegun comment.",
  E019: "Unmatched '{a}'.",
  E020: "Expected '{a}' to match '{b}' from line {c} and instead saw '{d}'.",
  E021: "Expected '{a}' and instead saw '{b}'.",
  E022: "Line breaking error '{a}'.",
  E023: "Missing '{a}'.",
  E024: "Unexpected '{a}'.",
  E025: "Missing ':' on a case clause.",
  E026: "Missing '}' to match '{' from line {a}.",
  E027: "Missing ']' to match '[' from line {a}.",
  E028: "Illegal comma.",
  E029: "Unclosed string.",

  // Everything else
  E030: "Expected an identifier and instead saw '{a}'.",
  E031: "Bad assignment.", // FIXME: Rephrase
  E032: "Expected a small integer or 'false' and instead saw '{a}'.",
  E033: "Expected an operator and instead saw '{a}'.",
  E034: "get/set are ES5 features.",
  E035: "Missing property name.",
  E036: "Expected to see a statement and instead saw a block.",
  E037: null,
  E038: null,
  E039: "Function declarations are not invocable. Wrap the whole function invocation in parens.",
  E040: "Each value should have its own case label.",
  E041: "Unrecoverable syntax error.",
  E042: "Stopping.",
  E043: "Too many errors.",
  E044: null,
  E045: "Invalid for each loop.",
  E046: "Yield expressions may only occur within generator functions.",
  E047: null,
  E048: "{a} declaration not directly within block.",
  E049: "A {a} cannot be named '{b}'.",
  E050: "Mozilla requires the yield expression to be parenthesized here.",
  E051: null,
  E052: "Unclosed template literal.",
  E053: "{a} declarations are only allowed at the top level of module scope.",
  E054: "Class properties must be methods. Expected '(' but instead saw '{a}'.",
  E055: "The '{a}' option cannot be set after any executable code.",
  E056: "'{a}' was used before it was declared, which is illegal for '{b}' variables.",
  E057: "Invalid meta property: '{a}.{b}'.",
  E058: "Missing semicolon.",
  E059: "Incompatible values for the '{a}' and '{b}' linting options.",
  E060: "Non-callable values cannot be used as the second operand to instanceof.",
  E061: "Invalid position for 'yield' expression (consider wrapping in parenthesis).",
  E062: "Rest parameter does not a support default value.",
  E063: "Super property may only be used within method bodies.",
  E064: "Super call may only be used within class method bodies.",
  E065: "Functions defined outside of strict mode with non-simple parameter lists may not " +
    "enable strict mode.",
  E066: "Asynchronous iteration is only available with for-of loops.",
  E067: "Malformed numeric literal: '{a}'.",
  E068: "Decimals with leading zeros are not allowed in strict mode.",
  E069: "Duplicate exported binding: '{a}'.",
  E070: "import.meta may only be used in module code."
};

var warnings = {
  W001: "'hasOwnProperty' is a really bad name.",
  W002: "Value of '{a}' may be overwritten in IE 8 and earlier.",
  W003: "'{a}' was used before it was defined.",
  W004: "'{a}' is already defined.",
  W005: "A dot following a number can be confused with a decimal point.",
  W006: "Confusing minuses.",
  W007: "Confusing plusses.",
  W008: "A leading decimal point can be confused with a dot: '{a}'.",
  W009: "The array literal notation [] is preferable.",
  W010: "The object literal notation {} is preferable.",
  W011: null,
  W012: null,
  W013: null,
  W014: "Misleading line break before '{a}'; readers may interpret this as an expression boundary.",
  W015: null,
  W016: "Unexpected use of '{a}'.",
  W017: "Bad operand.",
  W018: "Confusing use of '{a}'.",
  W019: "Use the isNaN function to compare with NaN.",
  W020: "Read only.",
  W021: "Reassignment of '{a}', which is a {b}. " +
    "Use 'var' or 'let' to declare bindings that may change.",
  W022: "Do not assign to the exception parameter.",
  W023: null,
  W024: "Expected an identifier and instead saw '{a}' (a reserved word).",
  W025: "Missing name in function declaration.",
  W026: "Inner functions should be listed at the top of the outer function.",
  W027: "Unreachable '{a}' after '{b}'.",
  W028: "Label '{a}' on {b} statement.",
  W030: "Expected an assignment or function call and instead saw an expression.",
  W031: "Do not use 'new' for side effects.",
  W032: "Unnecessary semicolon.",
  W033: "Missing semicolon.",
  W034: "Unnecessary directive \"{a}\".",
  W035: "Empty block.",
  W036: "Unexpected /*member '{a}'.",
  W037: "'{a}' is a statement label.",
  W038: "'{a}' used out of scope.",
  W039: null,
  W040: "If a strict mode function is executed using function invocation, " +
    "its 'this' value will be undefined.",
  W041: null,
  W042: "Avoid EOL escaping.",
  W043: "Bad escaping of EOL. Use option multistr if needed.",
  W044: "Bad or unnecessary escaping.", /* TODO(caitp): remove W044 */
  W045: "Value described by numeric literal cannot be accurately " +
    "represented with a number value: '{a}'.",
  W046: "Don't use extra leading zeros '{a}'.",
  W047: "A trailing decimal point can be confused with a dot: '{a}'.",
  W048: "Unexpected control character in regular expression.",
  W049: "Unexpected escaped character '{a}' in regular expression.",
  W050: "JavaScript URL.",
  W051: "Variables should not be deleted.",
  W052: "Unexpected '{a}'.",
  W053: "Do not use {a} as a constructor.",
  W054: "The Function constructor is a form of eval.",
  W055: "A constructor name should start with an uppercase letter.",
  W056: "Bad constructor.",
  W057: "Weird construction. Is 'new' necessary?",
  W058: "Missing '()' invoking a constructor.",
  W059: "Avoid arguments.{a}.",
  W060: "document.write can be a form of eval.",
  W061: "eval can be harmful.",
  W062: "Wrap an immediate function invocation in parens " +
    "to assist the reader in understanding that the expression " +
    "is the result of a function, and not the function itself.",
  W063: "Math is not a function.",
  W064: "Missing 'new' prefix when invoking a constructor.",
  W065: "Missing radix parameter.",
  W066: "Implied eval. Consider passing a function instead of a string.",
  W067: "Unorthodox function invocation.",
  W068: "Wrapping non-IIFE function literals in parens is unnecessary.",
  W069: "['{a}'] is better written in dot notation.",
  W070: "Extra comma. (it breaks older versions of IE)",
  W071: "This function has too many statements. ({a})",
  W072: "This function has too many parameters. ({a})",
  W073: "Blocks are nested too deeply. ({a})",
  W074: "This function's cyclomatic complexity is too high. ({a})",
  W075: "Duplicate {a} '{b}'.",
  W076: "Unexpected parameter '{a}' in get {b} function.",
  W077: "Expected a single parameter in set {a} function.",
  W078: "Setter is defined without getter.",
  W079: "Redefinition of '{a}'.",
  W080: "It's not necessary to initialize '{a}' to 'undefined'.",
  W081: null,
  W082: "Function declarations should not be placed in blocks. " +
    "Use a function expression or move the statement to the top of " +
    "the outer function.",
  W083: "Functions declared within loops referencing an outer scoped " +
    "variable may lead to confusing semantics. ({a})",
  W084: "Expected a conditional expression and instead saw an assignment.",
  W085: "Don't use 'with'.",
  W086: "Expected a 'break' statement before '{a}'.",
  W087: "Forgotten 'debugger' statement?",
  W088: "Creating global 'for' variable. Should be 'for (var {a} ...'.",
  W089: "The body of a for in should be wrapped in an if statement to filter " +
    "unwanted properties from the prototype.",
  W090: "'{a}' is not a statement label.",
  W091: null,
  W093: "Did you mean to return a conditional instead of an assignment?",
  W094: "Unexpected comma.",
  W095: "Expected a string and instead saw {a}.",
  W096: "The '{a}' key may produce unexpected results.",
  W097: "Use the function form of \"use strict\".",
  W098: "'{a}' is defined but never used.",
  W099: null,
  W100: null,
  W101: "Line is too long.",
  W102: null,
  W103: "The '{a}' property is deprecated.",
  W104: "'{a}' is available in ES{b} (use 'esversion: {b}') or Mozilla JS extensions (use moz).",
  W105: null,
  W106: "Identifier '{a}' is not in camel case.",
  W107: "Script URL.",
  W108: "Strings must use doublequote.",
  W109: "Strings must use singlequote.",
  W110: "Mixed double and single quotes.",
  W112: "Unclosed string.",
  W113: "Control character in string: {a}.",
  W114: "Avoid {a}.",
  W115: "Octal literals are not allowed in strict mode.",
  W116: "Expected '{a}' and instead saw '{b}'.",
  W117: "'{a}' is not defined.",
  W118: "'{a}' is only available in Mozilla JavaScript extensions (use moz option).",
  W119: "'{a}' is only available in ES{b} (use 'esversion: {b}').",
  W120: "You might be leaking a variable ({a}) here.",
  W121: "Extending prototype of native object: '{a}'.",
  W122: "Invalid typeof value '{a}'",
  W123: "'{a}' is already defined in outer scope.",
  W124: "A generator function should contain at least one yield expression.",
  W125: "This line contains non-breaking spaces: http://jshint.com/docs/options/#nonbsp",
  W126: "Unnecessary grouping operator.",
  W127: "Unexpected use of a comma operator.",
  W128: "Empty array elements require elision=true.",
  W129: "'{a}' is defined in a future version of JavaScript. Use a " +
    "different variable name to avoid migration issues.",
  W130: "Invalid element after rest element.",
  W131: "Invalid parameter after rest parameter.",
  W132: "`var` declarations are forbidden. Use `let` or `const` instead.",
  W133: "Invalid for-{a} loop left-hand-side: {b}.",
  W134: "The '{a}' option is only available when linting ECMAScript {b} code.",
  W135: "{a} may not be supported by non-browser environments.",
  W136: "'{a}' must be in function scope.",
  W137: "Empty destructuring: this is unnecessary and can be removed.",
  W138: "Regular parameters should not come after default parameters.",
  W139: "Function expressions should not be used as the second operand to instanceof.",
  W140: "Missing comma.",
  W141: "Empty {a}: this is unnecessary and can be removed.",
  W142: "Empty {a}: consider replacing with `import '{b}';`.",
  W143: "Assignment to properties of a mapped arguments object may cause " +
    "unexpected changes to formal parameters.",
  W144: "'{a}' is a non-standard language feature. Enable it using the '{b}' unstable option.",
  W145: "Superfluous 'case' clause.",
  W146: "Unnecessary `await` expression.",
  W147: "Regular expressions should include the 'u' flag.",
  W148: "Unnecessary RegExp 's' flag."
};

var info = {
  I001: "Comma warnings can be turned off with 'laxcomma'.",
  I002: null,
  I003: "ES5 option is now set per default"
};

exports.errors = {};
exports.warnings = {};
exports.info = {};

_.each(errors, function(desc, code) {
  exports.errors[code] = { code: code, desc: desc };
});

_.each(warnings, function(desc, code) {
  exports.warnings[code] = { code: code, desc: desc };
});

_.each(info, function(desc, code) {
  exports.info[code] = { code: code, desc: desc };
});

},{"lodash":12}],19:[function(require,module,exports){
/**
 * The NameStack class is used to approximate function name inference as
 * introduced by ECMAScript 2015. In that edition, the `name` property of
 * function objects is set according to the function's syntactic form. For
 * certain forms, this value depends on values available to the runtime during
 * execution. For example:
 *
 *     var fnName = function() {};
 *
 * In the program code above, the function object's `name` property is set to
 * `"fnName"` during execution.
 *
 * This general "name inference" behavior extends to a number of additional
 * syntactic forms, not all of which can be implemented statically. `NameStack`
 * is a support class representing a "best-effort" attempt to implement the
 * specified behavior in cases where this may be done statically.
 *
 * For more information on this behavior, see the following blog post:
 * https://bocoup.com/blog/whats-in-a-function-name
 */
"use strict";

function NameStack() {
  this._stack = [];
}

Object.defineProperty(NameStack.prototype, "length", {
  get: function() {
    return this._stack.length;
  }
});

/**
 * Create a new entry in the stack. Useful for tracking names across
 * expressions.
 */
NameStack.prototype.push = function() {
  this._stack.push(null);
};

/**
 * Discard the most recently-created name on the stack.
 */
NameStack.prototype.pop = function() {
  this._stack.pop();
};

/**
 * Update the most recent name on the top of the stack.
 *
 * @param {object} token The token to consider as the source for the most
 *                       recent name.
 */
NameStack.prototype.set = function(token) {
  this._stack[this.length - 1] = token;
};

/**
 * Generate a string representation of the most recent name.
 *
 * @returns {string}
 */
NameStack.prototype.infer = function() {
  var nameToken = this._stack[this.length - 1];
  var prefix = "";
  var type;

  // During expected operation, the topmost entry on the stack will only
  // reflect the current function's name when the function is declared without
  // the `function` keyword (i.e. for in-line accessor methods). In other
  // cases, the `function` expression itself will introduce an empty entry on
  // the top of the stack, and this should be ignored.
  if (!nameToken || nameToken.type === "class") {
    nameToken = this._stack[this.length - 2];
  }

  if (!nameToken) {
    return "(empty)";
  }

  type = nameToken.type;

  if (type !== "(string)" && type !== "(number)" && type !== "(identifier)" && type !== "default") {
    return "(expression)";
  }

  if (nameToken.accessorType) {
    prefix = nameToken.accessorType + " ";
  }

  return prefix + nameToken.value;
};

module.exports = NameStack;

},{}],20:[function(require,module,exports){
"use strict";

// These are the JSHint boolean options.
exports.bool = {
  enforcing: {

    /**
     * This option prohibits the use of bitwise operators such as `^` (XOR),
     * `|` (OR) and others. Bitwise operators are very rare in JavaScript
     * programs and quite often `&` is simply a mistyped `&&`.
     */
    bitwise     : true,

    /**
     *
     * This options prohibits overwriting prototypes of native objects such as
     * `Array`, `Date` and so on.
     *
     *     // jshint freeze:true
     *     Array.prototype.count = function (value) { return 4; };
     *     // -> Warning: Extending prototype of native object: 'Array'.
     */
    freeze      : true,

    /**
     * This option allows you to force all variable names to use either
     * camelCase style or UPPER_CASE with underscores.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    camelcase   : true,

    /**
     * This option requires you to always put curly braces around blocks in
     * loops and conditionals. JavaScript allows you to omit curly braces when
     * the block consists of only one statement, for example:
     *
     *     while (day)
     *       shuffle();
     *
     * However, in some circumstances, it can lead to bugs (you'd think that
     * `sleep()` is a part of the loop while in reality it is not):
     *
     *     while (day)
     *       shuffle();
     *       sleep();
     */
    curly       : true,

    /**
     * This options prohibits the use of `==` and `!=` in favor of `===` and
     * `!==`. The former try to coerce values before comparing them which can
     * lead to some unexpected results. The latter don't do any coercion so
     * they are generally safer. If you would like to learn more about type
     * coercion in JavaScript, we recommend [Truth, Equality and
     * JavaScript](http://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/)
     * by Angus Croll.
     */
    eqeqeq      : true,

    /**
     * This option enables warnings about the use of identifiers which are
     * defined in future versions of JavaScript. Although overwriting them has
     * no effect in contexts where they are not implemented, this practice can
     * cause issues when migrating codebases to newer versions of the language.
     */
    futurehostile: true,

    /**
     * This option tells JSHint that your code needs to adhere to ECMAScript 3
     * specification. Use this option if you need your program to be executable
     * in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
     * JavaScript environments.
     *
     * @deprecated Use `esversion: 3` instead.
     */
    es3         : true,

    /**
     * This option enables syntax first defined in [the ECMAScript 5.1
     * specification](http://es5.github.io/). This includes allowing reserved
     * keywords as object properties.
     *
     * @deprecated Use `esversion: 5` instead.
     */
    es5         : true,

    /**
     * This option requires all `for in` loops to filter object's items. The
     * for in statement allows for looping through the names of all of the
     * properties of an object including those inherited through the prototype
     * chain. This behavior can lead to unexpected items in your object so it
     * is generally safer to always filter inherited properties out as shown in
     * the example:
     *
     *     for (key in obj) {
     *       if (obj.hasOwnProperty(key)) {
     *         // We are sure that obj[key] belongs to the object and was not inherited.
     *       }
     *     }
     *
     * For more in-depth understanding of `for in` loops in JavaScript, read
     * [Exploring JavaScript for-in
     * loops](http://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/)
     * by Angus Croll.
     */
    forin       : true,

    /**
     * This option prohibits the use of immediate function invocations without
     * wrapping them in parentheses. Wrapping parentheses assists readers of
     * your code in understanding that the expression is the result of a
     * function, and not the function itself.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    immed       : true,

    /**
     * This option prohibits unnecessary clauses within `switch` statements,
     * e.g.
     *
     *     switch (x) {
     *       case 1:
     *       default:
     *         z();
     *     }
     *
     * While clauses like these are techincally valid, they do not effect
     * program behavior and may indicate an erroneous refactoring.
     */
    leanswitch  : true,

    /**
     * This option requires you to capitalize names of constructor functions.
     * Capitalizing functions that are intended to be used with `new` operator
     * is just a convention that helps programmers to visually distinguish
     * constructor functions from other types of functions to help spot
     * mistakes when using `this`.
     *
     * Not doing so won't break your code in any browsers or environments but
     * it will be a bit harder to figure out—by reading the code—if the
     * function was supposed to be used with or without new. And this is
     * important because when the function that was intended to be used with
     * `new` is used without it, `this` will point to the global object instead
     * of a new object.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    newcap      : true,

    /**
     * This option prohibits the use of `arguments.caller` and
     * `arguments.callee`.  Both `.caller` and `.callee` make quite a few
     * optimizations impossible so they were deprecated in future versions of
     * JavaScript. In fact, ECMAScript 5 forbids the use of `arguments.callee`
     * in strict mode.
     */
    noarg       : true,

    /**
     * This option prohibits the use of the comma operator. When misused, the
     * comma operator can obscure the value of a statement and promote
     * incorrect code.
     */
    nocomma     : true,

    /**
     * This option warns when you have an empty block in your code. JSLint was
     * originally warning for all empty blocks and we simply made it optional.
     * There were no studies reporting that empty blocks in JavaScript break
     * your code in any way.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    noempty     : true,

    /**
     * This option warns about "non-breaking whitespace" characters. These
     * characters can be entered with option-space on Mac computers and have a
     * potential of breaking non-UTF8 web pages.
     */
    nonbsp      : true,

    /**
     * This option prohibits the use of constructor functions for side-effects.
     * Some people like to call constructor functions without assigning its
     * result to any variable:
     *
     *     new MyConstructor();
     *
     * There is no advantage in this approach over simply calling
     * `MyConstructor` since the object that the operator `new` creates isn't
     * used anywhere so you should generally avoid constructors like this one.
     */
    nonew       : true,


    /**
     * Async functions resolve on their return value. In most cases, this makes
     * returning the result of an AwaitExpression (which is itself a Promise
     * instance) unnecessary. For clarity, it's often preferable to return the
     * result of the asynchronous operation directly. The notable exception is
     * within the `try` clause of a TryStatement--for more, see "await vs
     * return vs return await":
     *
     * https://jakearchibald.com/2017/await-vs-return-vs-return-await/
     */
    noreturnawait: true,

    /**
     * This option enables warnings for regular expressions which do not
     * include the "u" flag. The "u" flag extends support for Unicode and also
     * enables more strict parsing rules. JSHint will enforce these rules even
     * if it is executed in a JavaScript engine which does not support the "u"
     * flag.
     */
    regexpu     : true,

    /**
     * This option prohibits the use of explicitly undeclared variables. This
     * option is very useful for spotting leaking and mistyped variables.
     *
     *     // jshint undef:true
     *
     *     function test() {
     *       var myVar = 'Hello, World';
     *       console.log(myvar); // Oops, typoed here. JSHint with undef will complain
     *     }
     *
     * If your variable is defined in another file, you can use the `global`
     * directive to tell JSHint about it.
     */
    undef       : true,

    /**
     * This option prohibits the use of the grouping operator when it is not
     * strictly required. Such usage commonly reflects a misunderstanding of
     * unary operators, for example:
     *
     *     // jshint singleGroups: true
     *
     *     delete(obj.attr); // Warning: Unnecessary grouping operator.
     */
    singleGroups: false,

    /**
     * When set to true, the use of VariableStatements are forbidden.
     * For example:
     *
     *     // jshint varstmt: true
     *
     *     var a; // Warning: `var` declarations are forbidden. Use `let` or `const` instead.
     */
    varstmt: false,

    /**
     * This option is a short hand for the most strict JSHint configuration as
     * available in JSHint version 2.6.3. It enables all enforcing options and
     * disables all relaxing options that were defined in that release.
     *
     * @deprecated The option cannot be maintained without automatically opting
     *             users in to new features. This can lead to unexpected
     *             warnings/errors in when upgrading between minor versions of
     *             JSHint.
     */
    enforceall : false,

    /**
     * This option warns when a comma is not placed after the last element in an
     * array or object literal. Due to bugs in old versions of IE, trailing
     * commas used to be discouraged, but since ES5 their semantics were
     * standardized. (See
     * [#11.1.4](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.4) and
     * [#11.1.5](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.5).)
     * Now, they help to prevent the same [visual
     * ambiguities](http://www.ecma-international.org/ecma-262/5.1/#sec-7.9.2)
     * that the strict usage of semicolons helps prevent.
     *
     * For example, this code might have worked last Tuesday:
     *
     *     [
     *         b + c
     *     ].forEach(print);
     *
     * But if one adds an element to the array and forgets to compensate for the
     * missing comma, no syntax error is thrown, and a linter cannot determine
     * if this was a mistake or an intentional function invocation.
     *
     *     [
     *         b + c
     *         (d + e)
     *     ].forEach(print);
     *
     * If one always appends a list item with a comma, this ambiguity cannot
     * occur:
     *
     *     [
     *         b + c,
     *     ].forEach(print);
     *
     *     [
     *         b + c,
     *         (d + e),
     *     ].forEach(print);
     */
    trailingcomma: false
  },
  relaxing: {

    /**
     * This option suppresses warnings about missing semicolons. There is a lot
     * of FUD about semicolon spread by quite a few people in the community.
     * The common myths are that semicolons are required all the time (they are
     * not) and that they are unreliable. JavaScript has rules about semicolons
     * which are followed by *all* browsers so it is up to you to decide
     * whether you should or should not use semicolons in your code.
     *
     * For more information about semicolons in JavaScript read [An Open Letter
     * to JavaScript Leaders Regarding
     * Semicolons](http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding)
     * by Isaac Schlueter and [JavaScript Semicolon
     * Insertion](http://inimino.org/~inimino/blog/javascript_semicolons).
     */
    asi         : true,

    /**
     * This option suppresses warnings about multi-line strings. Multi-line
     * strings can be dangerous in JavaScript because all hell breaks loose if
     * you accidentally put a whitespace in between the escape character (`\`)
     * and a new line.
     *
     * Note that even though this option allows correct multi-line strings, it
     * still warns about multi-line strings without escape characters or with
     * anything in between the escape character and a whitespace.
     *
     *     // jshint multistr:true
     *
     *     var text = "Hello\
     *     World"; // All good.
     *
     *     text = "Hello
     *     World"; // Warning, no escape character.
     *
     *     text = "Hello\
     *     World"; // Warning, there is a space after \
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    multistr    : true,

    /**
     * This option suppresses warnings about the `debugger` statements in your
     * code.
     */
    debug       : true,

    /**
     * This option suppresses warnings about the use of assignments in cases
     * where comparisons are expected. More often than not, code like `if (a =
     * 10) {}` is a typo. However, it can be useful in cases like this one:
     *
     *     for (var i = 0, person; person = people[i]; i++) {}
     *
     * You can silence this error on a per-use basis by surrounding the assignment
     * with parenthesis, such as:
     *
     *     for (var i = 0, person; (person = people[i]); i++) {}
     */
    boss        : true,

    /**
     * This option suppresses warnings about the use of `eval`. The use of
     * `eval` is discouraged because it can make your code vulnerable to
     * various injection attacks and it makes it hard for JavaScript
     * interpreter to do certain optimizations.
    */
    evil        : true,

    /**
     * This option suppresses warnings about declaring variables inside
     * of control structures while accessing them later from the outside.
     * Even though identifiers declared with `var` have two real scopes—global
     * and function—such practice leads to confusion among people new to
     * the language and hard-to-debug bugs. This is why, by default, JSHint
     * warns about variables that are used outside of their intended scope.
     *
     *     function test() {
     *       if (true) {
     *         var x = 0;
     *       }
     *
     *       x += 1; // Default: 'x' used out of scope.
     *                 // No warning when funcscope:true
     *     }
     */
    funcscope   : true,

    /**
     * This option suppresses warnings about the use of global strict mode.
     * Global strict mode can break third-party widgets so it is not
     * recommended.
     *
     * For more info about strict mode see the `strict` option.
     *
     * @deprecated Use `strict: "global"`.
     */
    globalstrict: true,

    /**
     * This option suppresses warnings about the `__iterator__` property. This
     * property is not supported by all browsers so use it carefully.
     */
    iterator    : true,

     /**
     * This option suppresses warnings about invalid `typeof` operator values.
     * This operator has only [a limited set of possible return
     * values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof).
     * By default, JSHint warns when you compare its result with an invalid
     * value which often can be a typo.
     *
     *     // 'fuction' instead of 'function'
     *     if (typeof a == "fuction") { // Invalid typeof value 'fuction'
     *       // ...
     *     }
     *
     * Do not use this option unless you're absolutely sure you don't want
     * these checks.
     */
    notypeof    : true,

    /**
     * This option prohibits the use of unary increment and decrement
     * operators.  Some people think that `++` and `--` reduces the quality of
     * their coding styles and there are programming languages—such as
     * Python—that go completely without these operators.
     */
    plusplus    : true,

    /**
     * This option suppresses warnings about the `__proto__` property.
     */
    proto       : true,

    /**
     * This option suppresses warnings about the use of script-targeted
     * URLs—such as `javascript:...`.
     */
    scripturl   : true,

    /**
     * This option suppresses warnings about using `[]` notation when it can be
     * expressed in dot notation: `person['name']` vs. `person.name`.
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    sub         : true,

    /**
     * This option suppresses warnings about "weird" constructions like
     * `new function () { ... }` and `new Object;`. Such constructions are
     * sometimes used to produce singletons in JavaScript:
     *
     *     var singleton = new function() {
     *       var privateVar;
     *
     *       this.publicMethod  = function () {}
     *       this.publicMethod2 = function () {}
     *     };
     */
    supernew    : true,

    /**
     * This option suppresses most of the warnings about possibly unsafe line
     * breakings in your code. It doesn't suppress warnings about comma-first
     * coding style. To suppress those you have to use `laxcomma` (see below).
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    laxbreak    : true,

    /**
     * This option suppresses warnings about comma-first coding style:
     *
     *     var obj = {
     *         name: 'Anton'
     *       , handle: 'valueof'
     *       , role: 'SW Engineer'
     *     };
     *
     * @deprecated JSHint is limiting its scope to issues of code correctness.
     *             If you would like to enforce rules relating to code style,
     *             check out [the JSCS
     *             project](https://github.com/jscs-dev/node-jscs).
     */
    laxcomma    : true,

    /**
     * This option suppresses warnings about possible strict violations when
     * the code is running in strict mode and you use `this` in a
     * non-constructor function. You should use this option—in a function scope
     * only—when you are positive that your use of `this` is valid in the
     * strict mode (for example, if you call your function using
     * `Function.call`).
     *
     * **Note:** This option can be used only inside of a function scope.
     * JSHint will fail with an error if you will try to set this option
     * globally.
     */
    validthis   : true,

    /**
     * This option suppresses warnings about the use of the `with` statement.
     * The semantics of the `with` statement can cause confusion among
     * developers and accidental definition of global variables.
     *
     * More info:
     *
     * * [with Statement Considered
     *   Harmful](http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/)
     */
    withstmt    : true,

    /**
     * This options tells JSHint that your code uses Mozilla JavaScript
     * extensions. Unless you develop specifically for the Firefox web browser
     * you don't need this option.
     *
     * More info:
     *
     * * [New in JavaScript
     *   1.7](https://developer.mozilla.org/en-US/docs/JavaScript/New_in_JavaScript/1.7)
     */
    moz         : true,

    /**
     * This option suppresses warnings about generator functions with no
     * `yield` statement in them.
     */
    noyield     : true,

    /**
     * This option suppresses warnings about `== null` comparisons. Such
     * comparisons are often useful when you want to check if a variable is
     * `null` or `undefined`.
     */
    eqnull      : true,

    /**
     * This option suppresses warnings about missing semicolons, but only when
     * the semicolon is omitted for the last statement in a one-line block:
     *
     *     var name = (function() { return 'Anton' }());
     *
     * This is a very niche use case that is useful only when you use automatic
     * JavaScript code generators.
     */
    lastsemic   : true,

    /**
     * This option suppresses warnings about functions inside of loops.
     * Defining functions inside of loops can lead to bugs such as this one:
     *
     *     var nums = [];
     *
     *     for (var i = 0; i < 10; i++) {
     *       nums[i] = function (j) {
     *         return i + j;
     *       };
     *     }
     *
     *     nums[0](2); // Prints 12 instead of 2
     *
     * To fix the code above you need to copy the value of `i`:
     *
     *     var nums = [];
     *
     *     for (var i = 0; i < 10; i++) {
     *       (function (i) {
     *         nums[i] = function (j) {
     *             return i + j;
     *         };
     *       }(i));
     *     }
     */
    loopfunc    : true,

    /**
     * This option suppresses warnings about the use of expressions where
     * normally you would expect to see assignments or function calls. Most of
     * the time, such code is a typo. However, it is not forbidden by the spec
     * and that's why this warning is optional.
     */
    expr        : true,

    /**
     * This option tells JSHint that your code uses ECMAScript 6 specific
     * syntax. Note that not all browsers implement these features.
     *
     * More info:
     *
     * * [Specification for ECMAScript
     *   6](http://www.ecma-international.org/ecma-262/6.0/index.html)
     *
     * @deprecated Use `esversion: 6` instead.
     */
    esnext      : true,

    /**
     * This option tells JSHint that your code uses ES3 array elision elements,
     * or empty elements (for example, `[1, , , 4, , , 7]`).
     */
    elision     : true,
  },

  // Third party globals
  environments: {

    /**
     * This option defines globals exposed by the
     * [MooTools](http://mootools.net/) JavaScript framework.
     */
    mootools    : true,

    /**
     * This option defines globals exposed by
     * [CouchDB](http://couchdb.apache.org/). CouchDB is a document-oriented
     * database that can be queried and indexed in a MapReduce fashion using
     * JavaScript.
     */
    couch       : true,

    /**
     * This option defines globals exposed by [the Jasmine unit testing
     * framework](https://jasmine.github.io/).
     */
    jasmine     : true,

    /**
     * This option defines globals exposed by the [jQuery](http://jquery.com/)
     * JavaScript library.
     */
    jquery      : true,

    /**
     * This option defines globals available when your code is running inside
     * of the Node runtime environment. [Node.js](http://nodejs.org/) is a
     * server-side JavaScript environment that uses an asynchronous
     * event-driven model. This option also skips some warnings that make sense
     * in the browser environments but don't make sense in Node such as
     * file-level `use strict` pragmas and `console.log` statements.
     */
    node        : true,

    /**
     * This option defines globals exposed by [the QUnit unit testing
     * framework](http://qunitjs.com/).
     */
    qunit       : true,

    /**
     * This option defines globals available when your code is running inside
     * of the Rhino runtime environment. [Rhino](http://www.mozilla.org/rhino/)
     * is an open-source implementation of JavaScript written entirely in Java.
     */
    rhino       : true,

    /**
     * This option defines globals exposed by [the ShellJS
     * library](http://documentup.com/arturadib/shelljs).
     */
    shelljs     : true,

    /**
     * This option defines globals exposed by the
     * [Prototype](http://www.prototypejs.org/) JavaScript framework.
     */
    prototypejs : true,

    /**
     * This option defines globals exposed by the [YUI](http://yuilibrary.com/)
     * JavaScript framework.
     */
    yui         : true,

    /**
     * This option defines globals exposed by the "BDD" and "TDD" UIs of the
     * [Mocha unit testing framework](http://mochajs.org/).
     */
    mocha       : true,

    /**
     * This option informs JSHint that the input code describes an ECMAScript 6
     * module. All module code is interpreted as strict mode code.
     */
    module      : true,

    /**
     * This option defines globals available when your code is running as a
     * script for the [Windows Script
     * Host](http://en.wikipedia.org/wiki/Windows_Script_Host).
     */
    wsh         : true,

    /**
     * This option defines globals available when your code is running inside
     * of a Web Worker. [Web
     * Workers](https://developer.mozilla.org/en/Using_web_workers) provide a
     * simple means for web content to run scripts in background threads.
     */
    worker      : true,

    /**
     * This option defines non-standard but widely adopted globals such as
     * `escape` and `unescape`.
     */
    nonstandard : true,

    /**
     * This option defines globals exposed by modern browsers: all the way from
     * good old `document` and `navigator` to the HTML5 `FileReader` and other
     * new developments in the browser world.
     *
     * **Note:** This option doesn't expose variables like `alert` or
     * `console`. See option `devel` for more information.
     */
    browser     : true,

    /**
     * This option defines globals available when using [the Browserify
     * tool](http://browserify.org/) to build a project.
     */
    browserify  : true,

    /**
     * This option defines globals that are usually used for logging poor-man's
     * debugging: `console`, `alert`, etc. It is usually a good idea to not
     * ship them in production because, for example, `console.log` breaks in
     * legacy versions of Internet Explorer.
     */
    devel       : true,

    /**
     * This option defines globals exposed by the [Dojo
     * Toolkit](http://dojotoolkit.org/).
     */
    dojo        : true,

    /**
     * This option defines globals for typed array constructors.
     *
     * More info:
     *
     * * [JavaScript typed
     *   arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays)
     */
    typed       : true,

    /**
     * This option defines globals available when your core is running inside
     * of the PhantomJS runtime environment. [PhantomJS](http://phantomjs.org/)
     * is a headless WebKit scriptable with a JavaScript API. It has fast and
     * native support for various web standards: DOM handling, CSS selector,
     * JSON, Canvas, and SVG.
     */
    phantom     : true
  },

  // Obsolete options
  obsolete: {
    onecase     : true, // if one case switch statements should be allowed
    regexp      : true, // if the . should not be allowed in regexp literals
    regexdash   : true  // if unescaped first/last dash (-) inside brackets
                        // should be tolerated
  }
};

// These are the JSHint options that can take any value
// (we use this object to detect invalid options)
exports.val = {

  /**
   * This option lets you set the maximum length of a line.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  maxlen       : false,

  /**
   * This option sets a specific tab width for your code.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  indent       : false,

  /**
   * This options allows you to set the maximum amount of errors JSHint will
   * produce before giving up. Default is 50.
   */
  maxerr       : false,

  /**
   * This option allows you to control which variables JSHint considers to be
   * implicitly defined in the environment. Configure it with an array of
   * string values. Prefixing a variable name with a hyphen (-) character will
   * remove that name from the collection of predefined variables.
   *
   * JSHint will consider variables declared in this way to be read-only.
   *
   * This option cannot be specified in-line; it may only be used via the
   * JavaScript API or from an external configuration file.
   */
  predef       : false,

  /**
   * This option can be used to specify a white list of global variables that
   * are not formally defined in the source code. This is most useful when
   * combined with the `undef` option in order to suppress warnings for
   * project-specific global variables.
   *
   * Setting an entry to `true` enables reading and writing to that variable.
   * Setting it to `false` will trigger JSHint to consider that variable
   * read-only.
   *
   * See also the "environment" options: a set of options to be used as short
   * hand for enabling global variables defined in common JavaScript
   * environments.
   *
   * To configure `globals` within an individual file, see [Inline
   * Configuration](http://jshint.com/docs/#inline-configuration).
   */
  globals      : false,

  /**
   * This option enforces the consistency of quotation marks used throughout
   * your code. It accepts three values: `true` if you don't want to enforce
   * one particular style but want some consistency, `"single"` if you want to
   * allow only single quotes and `"double"` if you want to allow only double
   * quotes.
   *
   * @deprecated JSHint is limiting its scope to issues of code correctness. If
   *             you would like to enforce rules relating to code style, check
   *             out [the JSCS project](https://github.com/jscs-dev/node-jscs).
   */
  quotmark     : false,

  scope        : false,

  /**
   * This option lets you set the max number of statements allowed per function:
   *
   *     // jshint maxstatements:4
   *
   *     function main() {
   *       var i = 0;
   *       var j = 0;
   *
   *       // Function declarations count as one statement. Their bodies
   *       // don't get taken into account for the outer function.
   *       function inner() {
   *         var i2 = 1;
   *         var j2 = 1;
   *
   *         return i2 + j2;
   *       }
   *
   *       j = i + j;
   *       return j; // JSHint: Too many statements per function. (5)
   *     }
   */
  maxstatements: false,

  /**
   * This option lets you control how nested do you want your blocks to be:
   *
   *     // jshint maxdepth:2
   *
   *     function main(meaning) {
   *       var day = true;
   *
   *       if (meaning === 42) {
   *         while (day) {
   *           shuffle();
   *
   *           if (tired) { // JSHint: Blocks are nested too deeply (3).
   *               sleep();
   *           }
   *         }
   *       }
   *     }
   */
  maxdepth     : false,

  /**
   * This option lets you set the max number of formal parameters allowed per
   * function:
   *
   *     // jshint maxparams:3
   *
   *     function login(request, onSuccess) {
   *       // ...
   *     }
   *
   *     // JSHint: Too many parameters per function (4).
   *     function logout(request, isManual, whereAmI, onSuccess) {
   *       // ...
   *     }
   */
  maxparams    : false,

  /**
   * This option lets you control cyclomatic complexity throughout your code.
   * Cyclomatic complexity measures the number of linearly independent paths
   * through a program's source code. Read more about [cyclomatic complexity on
   * Wikipedia](http://en.wikipedia.org/wiki/Cyclomatic_complexity).
   */
  maxcomplexity: false,

  /**
   * This option suppresses warnings about variable shadowing i.e. declaring a
   * variable that had been already declared somewhere in the outer scope.
   *
   * - "inner"  - check for variables defined in the same scope only
   * - "outer"  - check for variables defined in outer scopes as well
   * - false    - same as inner
   * - true     - allow variable shadowing
   */
  shadow       : false,

  /**
   * This option requires the code to run in ECMAScript 5's strict mode.
   * [Strict mode](https://developer.mozilla.org/en/JavaScript/Strict_mode)
   * is a way to opt in to a restricted variant of JavaScript. Strict mode
   * eliminates some JavaScript pitfalls that didn't cause errors by changing
   * them to produce errors.  It also fixes mistakes that made it difficult
   * for the JavaScript engines to perform certain optimizations.
   *
   * - "global"  - there must be a `"use strict";` directive at global level
   * - "implied" - lint the code as if there is the `"use strict";` directive
   * - false     - disable warnings about strict mode
   * - true      - there must be a `"use strict";` directive at function level;
   *               this is preferable for scripts intended to be loaded in web
   *               browsers directly because enabling strict mode globally
   *               could adversely effect other scripts running on the same
   *               page
   */
  strict      : true,

  /**
   * This option warns when you define and never use your variables. It is very
   * useful for general code cleanup, especially when used in addition to
   * `undef`.
   *
   *     // jshint unused:true
   *
   *     function test(a, b) {
   *       var c, d = 2;
   *
   *       return a + d;
   *     }
   *
   *     test(1, 2);
   *
   *     // Line 3: 'b' was defined but never used.
   *     // Line 4: 'c' was defined but never used.
   *
   * In addition to that, this option will warn you about unused global
   * variables declared via the `global` directive.
   *
   * When set to `true`, unused parameters that are followed by a used
   * parameter will not produce warnings. This option can be set to `vars` to
   * only check for variables, not function parameters, or `strict` to check
   * all variables and parameters.
   */
  unused       : true,

  /**
   * This option prohibits the use of a variable before it was defined.
   * JavaScript has function scope only and, in addition to that, all variables
   * are always moved—or hoisted— to the top of the function. This behavior can
   * lead to some very nasty bugs and that's why it is safer to always use
   * variable only after they have been explicitly defined.
   *
   * Setting this option to "nofunc" will allow function declarations to be
   * ignored.
   *
   * For more in-depth understanding of scoping and hoisting in JavaScript,
   * read [JavaScript Scoping and
   * Hoisting](http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting)
   * by Ben Cherry.
   */
  latedef      : false,

  ignore       : false, // start/end ignoring lines of code, bypassing the lexer
                        //   start    - start ignoring lines, including the current line
                        //   end      - stop ignoring lines, starting on the next line
                        //   line     - ignore warnings / errors for just a single line
                        //              (this option does not bypass the lexer)

  ignoreDelimiters: false, // array of start/end delimiters used to ignore
                           // certain chunks from code

  /**
   * This option is used to specify the ECMAScript version to which the code
   * must adhere. It can assume one of the following values:
   *  - `3` - If you need your program to be executable
   *    in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
   *    JavaScript environments
   *  - `5` - To enable syntax first defined in [the ECMAScript 5.1
   *    specification](http://www.ecma-international.org/ecma-262/5.1/index.html).
   *    This includes allowing reserved keywords as object properties.
   *  - `6` - To tell JSHint that your code uses [ECMAScript
   *    6](http://www.ecma-international.org/ecma-262/6.0/index.html) specific
   *    syntax. Note that not all browsers implement them.
   *  - `7` - To enable language features introduced by [ECMAScript
   *    7](https://www.ecma-international.org/ecma-262/7.0/index.html). Notable
   *    additions: the exponentiation operator.
   *  - `8` - To enable language features introduced by [ECMAScript
   *    8](https://www.ecma-international.org/ecma-262/8.0/index.html). Notable
   *    additions: async functions, shared memory, and atomics
   *  - `9` - To enable language features introduced by [ECMAScript
   *    9](https://www.ecma-international.org/ecma-262/9.0/index.html). Notable
   *    additions: asynchronous iteration, rest/spread properties, and various
   *    RegExp extensions
   *  - `10` - To enable language features introduced by [ECMAScript
   *    10](https://www.ecma-international.org/ecma-262/10.0/index.html).
   *    Notable additions: optional catch bindings.
   *  - `11` - To enable language features introduced by ECMAScript 11. Notable
   *    additions: "export * as ns from 'module'", `import.meta`, the nullish
   *    coalescing operator, the BigInt type, the `globalThis` binding,
   *    optional chaining, and dynamic import.
   */
  esversion: 5
};

/**
 * Unstable options allow control for parsing and linting of proposed additions
 * to the JavaScript language. Just like the language features they describe,
 * the presence and behavior of these options is volatile; JSHint reserves the
 * right to remove or modify them between major version releases.
 */
exports.unstable = {
};

// These are JSHint boolean options which are shared with JSLint
// where the definition in JSHint is opposite JSLint
exports.inverted = {
  bitwise : true,
  forin   : true,
  newcap  : true,
  plusplus: true,
  regexp  : true,
  undef   : true,

  // Inverted and renamed, use JSHint name here
  eqeqeq  : true,
  strict  : true
};

exports.validNames = Object.keys(exports.val)
  .concat(Object.keys(exports.bool.relaxing))
  .concat(Object.keys(exports.bool.enforcing))
  .concat(Object.keys(exports.bool.obsolete))
  .concat(Object.keys(exports.bool.environments))
  .concat(["unstable"]);

exports.unstableNames = Object.keys(exports.unstable);

// These are JSHint boolean options which are shared with JSLint
// where the name has been changed but the effect is unchanged
exports.renamed = {
  eqeq   : "eqeqeq",
  windows: "wsh",
  sloppy : "strict"
};

exports.removed = {
  nomen: true,
  onevar: true,
  passfail: true,
  white: true,
  gcl: true,
  smarttabs: true,
  trailing: true
};

// Add options here which should not be automatically enforced by
// `enforceall`.
exports.noenforceall = {
  varstmt: true,
  strict: true,
  regexpu: true
};

},{}],21:[function(require,module,exports){
/**
 * This module defines a set of enum-like values intended for use as bit
 * "flags" during parsing. The ECMAScript grammar defines a number of such
 * "production parameters" to control how certain forms are parsed in context.
 * JSHint implements additional parameters to facilitate detection of lint
 * warnings.
 *
 * An equivalent implementation which described the context in terms of a
 * "lookup table" object would be more idiomatic for a JavaScript project like
 * JSHint. However, because the number of contexts scales with the number of
 * expressions in the input program, this would have non-negligible impact on
 * the process's memory footprint.
 */
module.exports = {
  /**
   * Enabled when parsing expressions within ES2015 "export" declarations,
   * allowing otherwise-unreferenced bindings to be considered "used".
   */
  export: 1,

  /**
   * Enabled when parsing expressions within the head of `for` statements,
   * allowing to distinguish between `for-in` and "C-style" `for` statements.
   */
  noin: 2,

  /**
   * Enabled when the expression begins the statement, allowing the parser to
   * correctly select between the null denotation ("nud") and first null
   * denotation ("fud") parsing strategy.
   */
  initial: 4,

  preAsync: 8,

  async: 16,

  /**
   * Enabled when any exception thrown by the expression will be caught by a
   * TryStatement.
   */
  tryClause: 32,

  /**
   * Enabled when parsing the body of a generator function.
   */
  yield: 64
};

},{}],22:[function(require,module,exports){
/*
 * Regular expressions. Some of these are stupidly long.
 */

/*jshint maxlen:1000 */

"use strict";

// Unsafe comment or string (ax)
exports.unsafeString =
  /@cc|<\/?|script|\]\s*\]|<\s*!|&lt/i;

// Characters in strings that need escaping (nx and nxg)
exports.needEsc =
  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/;

exports.needEscGlobal =
  /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;

// Star slash (lx)
exports.starSlash = /\*\//;

// Identifier (ix)
exports.identifier = /^([a-zA-Z_$][a-zA-Z0-9_$]*)$/;

// JavaScript URL (jx)
exports.javascriptURL = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;

// Catches /* falls through */ comments (ft)
exports.fallsThrough = /^\s*falls?\sthrough\s*$/;

// very conservative rule (eg: only one space between the start of the comment and the first character)
// to relax the maxlen option
exports.maxlenException = /^(?:(?:\/\/|\/\*|\*) ?)?[^ ]+$/;

// Node.js releases prior to version 8 include a version of the V8 engine which
// incorrectly interprets the character class escape `\s`. The following
// regular expression may be replaced with `/\s/` when JSHint removes support
// for Node.js versions prior to 8.
// Source:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
exports.whitespace = /[ \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]/;

exports.nonzeroDigit = /^[1-9]$/;

exports.decimalDigit = /^[0-9]$/;

exports.regexpSyntaxChars = /[\^$\\.*+?()[\]{}|]/;

exports.regexpQuantifiers = /[*+?{]/;

exports.regexpControlEscapes = /[fnrtv]/;

exports.regexpCharClasses = /[dDsSwWpP]/;

// Identifies the "dot" atom in regular expressions
exports.regexpDot = /(^|[^\\])(\\\\)*\./;

},{}],23:[function(require,module,exports){
"use strict";
/**
 * A note on `__proto__`:
 *
 * This file uses ordinary objects to track identifiers that are observed in
 * the input source code. It creates these objects using `Object.create` so
 * that the tracking objects have no prototype, allowing the `__proto__`
 * property to be used to store a value *without* triggering the invocation of
 * the built-in `Object.prototype.__proto__` accessor method. Some environments
 * (e.g. PhantomJS) do not implement the correct semantics for property
 * enumeration. In those environments, methods like `Object.keys` and Lodash's
 * `values` do not include the property name. This file includes a number of
 * branches which ensure that JSHint behaves consistently in those
 * environments. The branches must be ignored by the test coverage verification
 * system because the workaround is not necessary in the environment where
 * coverage is verified (i.e. Node.js).
 */

var _      = require("lodash");
var events = require("events");

// Used to denote membership in lookup tables (a primitive value such as `true`
// would be silently rejected for the property name "__proto__" in some
// environments)
var marker = {};

/**
 * A factory function for creating scope managers. A scope manager tracks
 * bindings, detecting when variables are referenced (through "usages").
 *
 * @param {object} state - the global state object (see `state.js`)
 * @param {Array} predefined - a set of binding names for built-in bindings
 *                             provided by the environment
 * @param {object} exported - a hash for binding names that are intended to be
 *                            referenced in contexts beyond the current program
 *                            code
 * @param {object} declared - a hash for binding names that were defined as
 *                            global bindings via linting configuration
 *
 * @returns {object} - a scope manager
 */
var scopeManager = function(state, predefined, exported, declared) {

  var _current;
  var _scopeStack = [];

  function _newScope(type) {
    _current = {
      "(bindings)": Object.create(null),
      "(usages)": Object.create(null),
      "(labels)": Object.create(null),
      "(parent)": _current,
      "(type)": type,
      "(params)": (type === "functionparams" || type === "catchparams") ? [] : null
    };
    _scopeStack.push(_current);
  }

  _newScope("global");
  _current["(predefined)"] = predefined;

  var _currentFunctBody = _current; // this is the block after the params = function

  var usedPredefinedAndGlobals = Object.create(null);
  var impliedGlobals = Object.create(null);
  var unuseds = [];
  var esModuleExports = [];
  var emitter = new events.EventEmitter();

  function warning(code, token) {
    emitter.emit("warning", {
      code: code,
      token: token,
      data: _.slice(arguments, 2)
    });
  }

  function error(code, token) {
    emitter.emit("warning", {
      code: code,
      token: token,
      data: _.slice(arguments, 2)
    });
  }

  function _setupUsages(bindingName) {
    if (!_current["(usages)"][bindingName]) {
      _current["(usages)"][bindingName] = {
        "(modified)": [],
        "(reassigned)": [],
        "(tokens)": []
      };
    }
  }

  var _getUnusedOption = function(unused_opt) {
    if (unused_opt === undefined) {
      unused_opt = state.option.unused;
    }

    if (unused_opt === true) {
      unused_opt = "last-param";
    }

    return unused_opt;
  };

  var _warnUnused = function(name, tkn, type, unused_opt) {
    var line = tkn.line;
    var chr  = tkn.from;
    var raw_name = tkn.raw_text || name;

    unused_opt = _getUnusedOption(unused_opt);

    var warnable_types = {
      "vars": ["var"],
      "last-param": ["var", "param"],
      "strict": ["var", "param", "last-param"]
    };

    if (unused_opt) {
      if (warnable_types[unused_opt] && warnable_types[unused_opt].indexOf(type) !== -1) {
        warning("W098", { line: line, from: chr }, raw_name);
      }
    }

    // inconsistent - see gh-1894
    if (unused_opt || type === "var") {
      unuseds.push({
        name: name,
        line: line,
        character: chr
      });
    }
  };

  /**
   * Check the current scope for unused identifiers
   */
  function _checkForUnused() {
    if (_current["(type)"] !== "functionparams") {
      var currentBindings = _current["(bindings)"];
      for (var bindingName in currentBindings) {
        if (currentBindings[bindingName]["(type)"] !== "exception" &&
          currentBindings[bindingName]["(unused)"]) {
          _warnUnused(bindingName, currentBindings[bindingName]["(token)"], "var");
        }
      }
      return;
    }

    // Check the current scope for unused parameters and issue warnings as
    // necessary.
    var params = _current["(params)"];

    var param = params.pop();
    var unused_opt;

    while (param) {
      var binding = _current["(bindings)"][param];

      unused_opt = _getUnusedOption(state.funct["(unusedOption)"]);

      // 'undefined' is a special case for the common pattern where `undefined`
      // is used as a formal parameter name to defend against global
      // re-assignment, e.g.
      //
      //     (function(window, undefined) {
      //     })();
      if (param === "undefined")
        return;

      if (binding["(unused)"]) {
        _warnUnused(param, binding["(token)"], "param", state.funct["(unusedOption)"]);
      } else if (unused_opt === "last-param") {
        return;
      }

      param = params.pop();
    }
  }

  /**
   * Find the relevant binding's scope. The owning scope is located by first
   * inspecting the current scope and then moving "downward" through the stack
   * of scopes.
   *
   * @param {string} bindingName - the value of the identifier
   *
   * @returns {Object} - the scope in which the binding was found
   */
  function _getBinding(bindingName) {
    for (var i = _scopeStack.length - 1 ; i >= 0; --i) {
      var scopeBindings = _scopeStack[i]["(bindings)"];
      if (scopeBindings[bindingName]) {
        return scopeBindings;
      }
    }
  }

  /**
   * Determine if a given binding name has been referenced within the current
   * function or any function defined within.
   *
   * @param {string} bindingName - the value of the identifier
   *
   * @returns {boolean}
   */
  function usedSoFarInCurrentFunction(bindingName) {
    for (var i = _scopeStack.length - 1; i >= 0; i--) {
      var current = _scopeStack[i];
      if (current["(usages)"][bindingName]) {
        return current["(usages)"][bindingName];
      }
      if (current === _currentFunctBody) {
        break;
      }
    }
    return false;
  }

  function _checkOuterShadow(bindingName, token) {

    // only check if shadow is outer
    if (state.option.shadow !== "outer") {
      return;
    }

    var isGlobal = _currentFunctBody["(type)"] === "global",
      isNewFunction = _current["(type)"] === "functionparams";

    var outsideCurrentFunction = !isGlobal;
    for (var i = 0; i < _scopeStack.length; i++) {
      var stackItem = _scopeStack[i];

      if (!isNewFunction && _scopeStack[i + 1] === _currentFunctBody) {
        outsideCurrentFunction = false;
      }
      if (outsideCurrentFunction && stackItem["(bindings)"][bindingName]) {
        warning("W123", token, bindingName);
      }
      if (stackItem["(labels)"][bindingName]) {
        warning("W123", token, bindingName);
      }
    }
  }

  function _latedefWarning(type, bindingName, token) {
    var isFunction;

    if (state.option.latedef) {
      isFunction = type === "function" || type === "generator function" ||
        type === "async function";

      // if either latedef is strict and this is a function
      //    or this is not a function
      if ((state.option.latedef === true && isFunction) || !isFunction) {
        warning("W003", token, bindingName);
      }
    }
  }

  var scopeManagerInst = {

    on: function(names, listener) {
      names.split(" ").forEach(function(name) {
        emitter.on(name, listener);
      });
    },

    isPredefined: function(bindingName) {
      return !this.has(bindingName) && _.has(_scopeStack[0]["(predefined)"], bindingName);
    },

    /**
     * Create a new scope within the current scope. As the topmost value, the
     * new scope will be interpreted as the current scope until it is
     * exited--see the `unstack` method.
     *
     * @param {string} [type] - The type of the scope. Valid values are
     *                          "functionparams", "catchparams" and
     *                          "functionouter"
     */
    stack: function(type) {
      var previousScope = _current;
      _newScope(type);

      if (!type && previousScope["(type)"] === "functionparams") {

        _current["(isFuncBody)"] = true;
        _currentFunctBody = _current;
      }
    },

    /**
     * Valldate all binding references and declarations in the current scope
     * and set the next scope on the stack as the active scope.
     */
    unstack: function() {
      // jshint proto: true
      var subScope = _scopeStack.length > 1 ? _scopeStack[_scopeStack.length - 2] : null;
      var isUnstackingFunctionBody = _current === _currentFunctBody,
        isUnstackingFunctionParams = _current["(type)"] === "functionparams",
        isUnstackingFunctionOuter = _current["(type)"] === "functionouter";

      var i, j, isImmutable, isFunction;
      var currentUsages = _current["(usages)"];
      var currentBindings = _current["(bindings)"];
      var usedBindingNameList = Object.keys(currentUsages);

      // See comment, "A note on `__proto__`"
      /* istanbul ignore if */
      if (currentUsages.__proto__ && usedBindingNameList.indexOf("__proto__") === -1) {
        usedBindingNameList.push("__proto__");
      }

      for (i = 0; i < usedBindingNameList.length; i++) {
        var usedBindingName = usedBindingNameList[i];

        var usage = currentUsages[usedBindingName];
        var usedBinding = currentBindings[usedBindingName];
        if (usedBinding) {
          var usedBindingType = usedBinding["(type)"];
          isImmutable = usedBindingType === "const" || usedBindingType === "import";

          if (usedBinding["(useOutsideOfScope)"] && !state.option.funcscope) {
            var usedTokens = usage["(tokens)"];
            for (j = 0; j < usedTokens.length; j++) {
              // Keep the consistency of https://github.com/jshint/jshint/issues/2409
              if (usedBinding["(function)"] === usedTokens[j]["(function)"]) {
                error("W038", usedTokens[j], usedBindingName);
              }
            }
          }

          // mark the binding used
          _current["(bindings)"][usedBindingName]["(unused)"] = false;

          // check for modifying a const
          if (isImmutable && usage["(modified)"]) {
            for (j = 0; j < usage["(modified)"].length; j++) {
              error("E013", usage["(modified)"][j], usedBindingName);
            }
          }

          isFunction = usedBindingType === "function" ||
            usedBindingType === "generator function" ||
            usedBindingType === "async function";

          // check for re-assigning a function declaration
          if ((isFunction || usedBindingType === "class") && usage["(reassigned)"]) {
            for (j = 0; j < usage["(reassigned)"].length; j++) {
              if (!usage["(reassigned)"][j].ignoreW021) {
                warning("W021", usage["(reassigned)"][j], usedBindingName, usedBindingType);
              }
            }
          }
          continue;
        }

        if (subScope) {
          var bindingType = this.bindingtype(usedBindingName);
          isImmutable = bindingType === "const" ||
            (bindingType === null && _scopeStack[0]["(predefined)"][usedBindingName] === false);
          if (isUnstackingFunctionOuter && !isImmutable) {
            if (!state.funct["(outerMutables)"]) {
              state.funct["(outerMutables)"] = [];
            }
            state.funct["(outerMutables)"].push(usedBindingName);
          }

          // not exiting the global scope, so copy the usage down in case its an out of scope usage
          if (!subScope["(usages)"][usedBindingName]) {
            subScope["(usages)"][usedBindingName] = usage;
            if (isUnstackingFunctionBody) {
              subScope["(usages)"][usedBindingName]["(onlyUsedSubFunction)"] = true;
            }
          } else {
            var subScopeUsage = subScope["(usages)"][usedBindingName];
            subScopeUsage["(modified)"] = subScopeUsage["(modified)"].concat(usage["(modified)"]);
            subScopeUsage["(tokens)"] = subScopeUsage["(tokens)"].concat(usage["(tokens)"]);
            subScopeUsage["(reassigned)"] =
              subScopeUsage["(reassigned)"].concat(usage["(reassigned)"]);
          }
        } else {
          // this is exiting global scope, so we finalise everything here - we are at the end of the file
          if (typeof _current["(predefined)"][usedBindingName] === "boolean") {

            // remove the declared token, so we know it is used
            delete declared[usedBindingName];

            // note it as used so it can be reported
            usedPredefinedAndGlobals[usedBindingName] = marker;

            // check for re-assigning a read-only (set to false) predefined
            if (_current["(predefined)"][usedBindingName] === false && usage["(reassigned)"]) {
              for (j = 0; j < usage["(reassigned)"].length; j++) {
                if (!usage["(reassigned)"][j].ignoreW020) {
                  warning("W020", usage["(reassigned)"][j]);
                }
              }
            }
          }
          else {
            // binding usage is not predefined and we have not found a declaration
            // so report as undeclared
            for (j = 0; j < usage["(tokens)"].length; j++) {
              var undefinedToken = usage["(tokens)"][j];
              // if its not a forgiven undefined (e.g. typof x)
              if (!undefinedToken.forgiveUndef) {
                // if undef is on and undef was on when the token was defined
                if (state.option.undef && !undefinedToken.ignoreUndef) {
                  warning("W117", undefinedToken, usedBindingName);
                }
                if (impliedGlobals[usedBindingName]) {
                  impliedGlobals[usedBindingName].line.push(undefinedToken.line);
                } else {
                  impliedGlobals[usedBindingName] = {
                    name: usedBindingName,
                    line: [undefinedToken.line]
                  };
                }
              }
            }
          }
        }
      }

      // if exiting the global scope, we can warn about declared globals that haven't been used yet
      if (!subScope) {
        Object.keys(declared)
          .forEach(function(bindingNotUsed) {
            _warnUnused(bindingNotUsed, declared[bindingNotUsed], "var");
          });
      }

      // If this is not a function boundary, transfer function-scoped bindings to
      // the parent block (a rough simulation of variable hoisting). Previously
      // existing bindings in the parent block should take precedence so that
      // prior usages are not discarded.
      if (subScope && !isUnstackingFunctionBody &&
        !isUnstackingFunctionParams && !isUnstackingFunctionOuter) {
        var bindingNames = Object.keys(currentBindings);
        for (i = 0; i < bindingNames.length; i++) {

          var defBindingName = bindingNames[i];
          var defBinding = currentBindings[defBindingName];

          if (!defBinding["(blockscoped)"] && defBinding["(type)"] !== "exception") {
            var shadowed = subScope["(bindings)"][defBindingName];

            // Do not overwrite a binding if it exists in the parent scope
            // because it is shared by adjacent blocks. Copy the `unused`
            // property so that any references found within the current block
            // are counted toward that higher-level declaration.
            if (shadowed) {
              shadowed["(unused)"] &= defBinding["(unused)"];

            // "Hoist" the variable to the parent block, decorating the binding
            // so that future references, though technically valid, can be
            // reported as "out-of-scope" in the absence of the `funcscope`
            // option.
            } else {
              defBinding["(useOutsideOfScope)"] =
                // Do not warn about out-of-scope usages in the global scope
                _currentFunctBody["(type)"] !== "global" &&
                // When a higher scope contains a binding for the binding, the
                // binding is a re-declaration and should not prompt "used
                // out-of-scope" warnings.
                !this.funct.has(defBindingName, { excludeCurrent: true });

              subScope["(bindings)"][defBindingName] = defBinding;
            }

            delete currentBindings[defBindingName];
          }
        }
      }

      _checkForUnused();

      _scopeStack.pop();
      if (isUnstackingFunctionBody) {
        _currentFunctBody = _scopeStack[_.findLastIndex(_scopeStack, function(scope) {
          // if function or if global (which is at the bottom so it will only return true if we call back)
          return scope["(isFuncBody)"] || scope["(type)"] === "global";
        })];
      }

      _current = subScope;
    },

    /**
     * Add a function parameter to the current scope.
     *
     * @param {string} bindingName - the value of the identifier
     * @param {Token} token
     * @param {string} [type] - binding type; defaults to "param"
     */
    addParam: function(bindingName, token, type) {
      type = type || "param";

      if (type === "exception") {
        // if defined in the current function
        var previouslyDefinedBindingType = this.funct.bindingtype(bindingName);
        if (previouslyDefinedBindingType && previouslyDefinedBindingType !== "exception") {
          // and has not been used yet in the current function scope
          if (!state.option.node) {
            warning("W002", state.tokens.next, bindingName);
          }
        }

        if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
          warning("E008", token);
        }
      }

      // The variable was declared in the current scope
      if (_.has(_current["(bindings)"], bindingName)) {
        _current["(bindings)"][bindingName].duplicated = true;

      // The variable was declared in an outer scope
      } else {
        // if this scope has the variable defined, it's a re-definition error
        _checkOuterShadow(bindingName, token);

        _current["(bindings)"][bindingName] = {
          "(type)" : type,
          "(token)": token,
          "(unused)": true };

        _current["(params)"].push(bindingName);
      }

      if (_.has(_current["(usages)"], bindingName)) {
        var usage = _current["(usages)"][bindingName];
        // if its in a sub function it is not necessarily an error, just latedef
        if (usage["(onlyUsedSubFunction)"]) {
          _latedefWarning(type, bindingName, token);
        } else {
          // this is a clear illegal usage, but not a syntax error, so emit a
          // warning and not an error
          warning("W003", token, bindingName);
        }
      }
    },

    validateParams: function(isArrow) {
      var isStrict = state.isStrict();
      var currentFunctParamScope = _currentFunctBody["(parent)"];
      // From ECMAScript 2017:
      //
      // > 14.1.2Static Semantics: Early Errors
      // >
      // > [...]
      // > - It is a Syntax Error if IsSimpleParameterList of
      // >   FormalParameterList is false and BoundNames of FormalParameterList
      // >   contains any duplicate elements.
      var isSimple = state.funct['(hasSimpleParams)'];
      // Method definitions are defined in terms of UniqueFormalParameters, so
      // they cannot support duplicate parameter names regardless of strict
      // mode.
      var isMethod = state.funct["(method)"];

      if (!currentFunctParamScope["(params)"]) {
        /* istanbul ignore next */
        return;
      }

      currentFunctParamScope["(params)"].forEach(function(bindingName) {
        var binding = currentFunctParamScope["(bindings)"][bindingName];

        if (binding.duplicated) {
          if (isStrict || isArrow || isMethod || !isSimple) {
            warning("E011", binding["(token)"], bindingName);
          } else if (state.option.shadow !== true) {
            warning("W004", binding["(token)"], bindingName);
          }
        }

        if (isStrict && (bindingName === "arguments" || bindingName === "eval")) {
          warning("E008", binding["(token)"]);
        }
      });
    },

    getUsedOrDefinedGlobals: function() {
      // jshint proto: true
      var list = Object.keys(usedPredefinedAndGlobals);

      // See comment, "A note on `__proto__`"
      /* istanbul ignore if */
      if (usedPredefinedAndGlobals.__proto__ === marker &&
        list.indexOf("__proto__") === -1) {
        list.push("__proto__");
      }

      return list;
    },

    /**
     * Get an array of implied globals
     *
     * @returns {Array.<{ name: string, line: Array.<number>}>}
     */
    getImpliedGlobals: function() {
      // jshint proto: true
      var values = _.values(impliedGlobals);
      var hasProto = false;

      // See comment, "A note on `__proto__`"
      if (impliedGlobals.__proto__) {
        hasProto = values.some(function(value) {
          return value.name === "__proto__";
        });

        /* istanbul ignore if */
        if (!hasProto) {
          values.push(impliedGlobals.__proto__);
        }
      }

      return values;
    },

    /**
     * Get an array of objects describing unused bindings.
     *
     * @returns {Array<Object>}
     */
    getUnuseds: function() {
      return unuseds;
    },

    /**
     * Determine if a given name has been defined in the current scope or any
     * lower scope.
     *
     * @param {string} bindingName - the value of the identifier
     *
     * @return {boolean}
     */
    has: function(bindingName) {
      return Boolean(_getBinding(bindingName));
    },

    /**
     * Retrieve binding described by `bindingName` or null
     *
     * @param {string} bindingName - the value of the identifier
     *
     * @returns {string|null} - the type of the binding or `null` if no such
     *                          binding exists
     */
    bindingtype: function(bindingName) {
      var scopeBindings = _getBinding(bindingName);
      if (scopeBindings) {
        return scopeBindings[bindingName]["(type)"];
      }
      return null;
    },

    /**
     * For the exported options, indicating a variable is used outside the file
     *
     * @param {string} bindingName - the value of the identifier
     */
    addExported: function(bindingName) {
      var globalBindings = _scopeStack[0]["(bindings)"];
      if (_.has(declared, bindingName)) {
        // remove the declared token, so we know it is used
        delete declared[bindingName];
      } else if (_.has(globalBindings, bindingName)) {
        globalBindings[bindingName]["(unused)"] = false;
      } else {
        for (var i = 1; i < _scopeStack.length; i++) {
          var scope = _scopeStack[i];
          // if `scope.(type)` is not defined, it is a block scope
          if (!scope["(type)"]) {
            if (_.has(scope["(bindings)"], bindingName) &&
                !scope["(bindings)"][bindingName]["(blockscoped)"]) {
              scope["(bindings)"][bindingName]["(unused)"] = false;
              return;
            }
          } else {
            break;
          }
        }
        exported[bindingName] = true;
      }
    },

    /**
     * Mark a binding as "exported" by an ES2015 module
     *
     * @param {string} bindingName - the value of the identifier
     * @param {object} token
     */
    setExported: function(localName, exportName) {
      if (exportName) {
        if (esModuleExports.indexOf(exportName.value) > -1) {
          error("E069", exportName, exportName.value);
        }

        esModuleExports.push(exportName.value);
      }

      if (localName) {
        this.block.use(localName.value, localName);
      }
    },

    /**
     * Mark a binding as "initialized." This is necessary to enforce the
     * "temporal dead zone" (TDZ) of block-scoped bindings which are not
     * hoisted.
     *
     * @param {string} bindingName - the value of the identifier
     */
    initialize: function(bindingName) {
      if (_current["(bindings)"][bindingName]) {
        _current["(bindings)"][bindingName]["(initialized)"] = true;
      }
    },

    /**
     * Create a new binding and add it to the current scope. Delegates to the
     * internal `block.add` or `func.add` methods depending on the type.
     * Produces warnings and errors as necessary.
     *
     * @param {string} bindingName
     * @param {Object} opts
     * @param {String} opts.type - the type of the binding e.g. "param", "var",
     *                             "let, "const", "import", "function",
     *                             "generator function", "async function",
     *                             "async generator function"
     * @param {object} opts.token - the token pointing at the declaration
     * @param {boolean} opts.initialized - whether the binding should be
     *                                     created in an "initialized" state.
     */
    addbinding: function(bindingName, opts) {

      var type  = opts.type;
      var token = opts.token;
      var isblockscoped = type === "let" || type === "const" ||
        type === "class" || type === "import" || type === "generator function" ||
        type === "async function" || type === "async generator function";
      var ishoisted = type === "function" || type === "generator function" ||
        type === "async function" || type === "import";
      var isexported    = (isblockscoped ? _current : _currentFunctBody)["(type)"] === "global" &&
                          _.has(exported, bindingName);

      // outer shadow check (inner is only on non-block scoped)
      _checkOuterShadow(bindingName, token);

      if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
        warning("E008", token);
      }

      if (isblockscoped) {

        var declaredInCurrentScope = _current["(bindings)"][bindingName];
        // for block scoped variables, params are seen in the current scope as the root function
        // scope, so check these too.
        if (!declaredInCurrentScope && _current === _currentFunctBody &&
          _current["(type)"] !== "global") {
          declaredInCurrentScope = !!_currentFunctBody["(parent)"]["(bindings)"][bindingName];
        }

        // if its not already defined (which is an error, so ignore) and is used in TDZ
        if (!declaredInCurrentScope && _current["(usages)"][bindingName]) {
          var usage = _current["(usages)"][bindingName];
          // if its in a sub function it is not necessarily an error, just latedef
          if (usage["(onlyUsedSubFunction)"] || ishoisted) {
            _latedefWarning(type, bindingName, token);
          } else if (!ishoisted) {
            // this is a clear illegal usage for block scoped variables
            warning("E056", token, bindingName, type);
          }
        }

        // If this scope has already declared a binding with the same name,
        // then this represents a redeclaration error if:
        //
        // 1. it is a "hoisted" block-scoped binding within a block. For
        //    instance: generator functions may be redeclared in the global
        //    scope but not within block statements
        // 2. this is not a "hoisted" block-scoped binding
        if (declaredInCurrentScope &&
          (!ishoisted || (_current["(type)"] !== "global" || type === "import"))) {
          warning("E011", token, bindingName);
        }
        else if (state.option.shadow === "outer") {

          // if shadow is outer, for block scope we want to detect any shadowing within this function
          if (scopeManagerInst.funct.has(bindingName)) {
            warning("W004", token, bindingName);
          }
        }

        scopeManagerInst.block.add(
          bindingName, type, token, !isexported, opts.initialized
        );

      } else {

        var declaredInCurrentFunctionScope = scopeManagerInst.funct.has(bindingName);

        // check for late definition, ignore if already declared
        if (!declaredInCurrentFunctionScope && usedSoFarInCurrentFunction(bindingName)) {
          _latedefWarning(type, bindingName, token);
        }

        // defining with a var or a function when a block scope variable of the same name
        // is in scope is an error
        if (scopeManagerInst.funct.has(bindingName, { onlyBlockscoped: true })) {
          warning("E011", token, bindingName);
        } else if (state.option.shadow !== true) {
          // now since we didn't get any block scope variables, test for var/function
          // shadowing
          if (declaredInCurrentFunctionScope && bindingName !== "__proto__") {

            // see https://github.com/jshint/jshint/issues/2400
            if (_currentFunctBody["(type)"] !== "global") {
              warning("W004", token, bindingName);
            }
          }
        }

        scopeManagerInst.funct.add(bindingName, type, token, !isexported);

        if (_currentFunctBody["(type)"] === "global" && !state.impliedClosure()) {
          usedPredefinedAndGlobals[bindingName] = marker;
        }
      }
    },

    funct: {
      /**
       * Return the type of the provided binding given certain options
       *
       * @param {string} bindingName
       * @param {Object=} [options]
       * @param {boolean} [options.onlyBlockscoped] - only include block scoped
       *                                              bindings
       * @param {boolean} [options.excludeParams] - exclude the param scope
       * @param {boolean} [options.excludeCurrent] - exclude the current scope
       *
       * @returns {String}
       */
      bindingtype: function(bindingName, options) {
        var onlyBlockscoped = options && options.onlyBlockscoped;
        var excludeParams = options && options.excludeParams;
        var currentScopeIndex = _scopeStack.length - (options && options.excludeCurrent ? 2 : 1);
        for (var i = currentScopeIndex; i >= 0; i--) {
          var current = _scopeStack[i];
          if (current["(bindings)"][bindingName] &&
            (!onlyBlockscoped || current["(bindings)"][bindingName]["(blockscoped)"])) {
            return current["(bindings)"][bindingName]["(type)"];
          }
          var scopeCheck = excludeParams ? _scopeStack[ i - 1 ] : current;
          if (scopeCheck && scopeCheck["(type)"] === "functionparams") {
            return null;
          }
        }
        return null;
      },

      /**
       * Determine whether a `break` statement label exists in the function
       * scope.
       *
       * @param {string} labelName - the value of the identifier
       *
       * @returns {boolean}
       */
      hasLabel: function(labelName) {
        for (var i = _scopeStack.length - 1; i >= 0; i--) {
          var current = _scopeStack[i];

          if (current["(labels)"][labelName]) {
            return true;
          }
          if (current["(type)"] === "functionparams") {
            return false;
          }
        }
        return false;
      },

      /**
       * Determine if a given name has been defined in the current function
       * scope.
       *
       * @param {string} bindingName - the value of the identifier
       * @param {object} options - options as supported by the
       *                           `funct.bindingtype` method
       *
       * @return {boolean}
       */
      has: function(bindingName, options) {
        return Boolean(this.bindingtype(bindingName, options));
      },

      /**
       * Create a new function-scoped binding and add it to the current scope.
       * See the `block.add` method for coresponding logic to create
       * block-scoped bindings.
       *
       * @param {string} bindingName - the value of the identifier
       * @param {string} type - the type of the binding; either "function" or
       *                        "var"
       * @param {object} tok - the token that triggered the definition
       * @param {boolean} unused - `true` if the binding has not been
       *                           referenced
       */
      add: function(bindingName, type, tok, unused) {
        _current["(bindings)"][bindingName] = {
          "(type)" : type,
          "(token)": tok,
          "(blockscoped)": false,
          "(function)": _currentFunctBody,
          "(unused)": unused };
      }
    },

    block: {

      /**
       * Determine whether the current block scope is the global scope.
       *
       * @returns Boolean
       */
      isGlobal: function() {
        return _current["(type)"] === "global";
      },

      /**
       * Resolve a reference to a binding and mark the corresponding binding as
       * "used."
       *
       * @param {string} bindingName - the value of the identifier
       * @param {object} token - the token value that triggered the reference
       */
      use: function(bindingName, token) {
        // If the name resolves to a parameter of the current function, then do
        // not store usage. This is because in cases such as the following:
        //
        //     function(a) {
        //       var a;
        //       a = a;
        //     }
        //
        // the usage of `a` will resolve to the parameter, not to the unset
        // variable binding.
        var paramScope = _currentFunctBody["(parent)"];
        if (paramScope && paramScope["(bindings)"][bindingName] &&
          paramScope["(bindings)"][bindingName]["(type)"] === "param") {

          // then check its not declared by a block scope variable
          if (!scopeManagerInst.funct.has(bindingName,
                { excludeParams: true, onlyBlockscoped: true })) {
            paramScope["(bindings)"][bindingName]["(unused)"] = false;
          }
        }

        if (token && (state.ignored.W117 || state.option.undef === false)) {
          token.ignoreUndef = true;
        }

        _setupUsages(bindingName);

        _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;

        if (token) {
          token["(function)"] = _currentFunctBody;
          _current["(usages)"][bindingName]["(tokens)"].push(token);
        }

        // Block-scoped bindings can't be used within their initializer due to
        // "temporal dead zone" (TDZ) restrictions.
        var binding = _current["(bindings)"][bindingName];
        if (binding && binding["(blockscoped)"] && !binding["(initialized)"]) {
          error("E056", token, bindingName, binding["(type)"]);
        }
      },

      reassign: function(bindingName, token) {
        token.ignoreW020 = state.ignored.W020;
        token.ignoreW021 = state.ignored.W021;

        this.modify(bindingName, token);

        _current["(usages)"][bindingName]["(reassigned)"].push(token);
      },

      modify: function(bindingName, token) {

        _setupUsages(bindingName);

        _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;
        _current["(usages)"][bindingName]["(modified)"].push(token);
      },

      /**
       * Create a new block-scoped binding and add it to the current scope. See
       * the `funct.add` method for coresponding logic to create
       * function-scoped bindings.
       *
       * @param {string} bindingName - the value of the identifier
       * @param {string} type - the type of the binding; one of "class",
       *                        "const", "function", "import", or "let"
       * @param {object} tok - the token that triggered the definition
       * @param {boolean} unused - `true` if the binding has not been
       *                           referenced
       * @param {boolean} initialized - `true` if the binding has been
       *                                initialized (as is the case with
       *                                bindings created via `import`
       *                                declarations)
       */
      add: function(bindingName, type, tok, unused, initialized) {
        _current["(bindings)"][bindingName] = {
          "(type)" : type,
          "(token)": tok,
          "(initialized)": !!initialized,
          "(blockscoped)": true,
          "(unused)": unused };
      },

      addLabel: function(labelName, opts) {
        var token = opts.token;
        if (scopeManagerInst.funct.hasLabel(labelName)) {
          warning("E011", token, labelName);
        }
        else if (state.option.shadow === "outer") {
          if (scopeManagerInst.funct.has(labelName)) {
            warning("W004", token, labelName);
          } else {
            _checkOuterShadow(labelName, token);
          }
        }
        _current["(labels)"][labelName] = token;
      }
    }
  };
  return scopeManagerInst;
};

module.exports = scopeManager;

},{"events":11,"lodash":12}],24:[function(require,module,exports){
"use strict";
var NameStack = require("./name-stack.js");

var state = {
  syntax: {},

  /**
   * Determine if the code currently being linted is strict mode code.
   *
   * @returns {boolean}
   */
  isStrict: function() {
    return !!this.directive["use strict"] || this.inClassBody ||
      this.option.module || this.option.strict === "implied";
  },

  /**
   * Determine if the current state warrants a warning for statements outside
   * of strict mode code.
   *
   * While emitting warnings based on function scope would be more intuitive
   * (and less noisy), JSHint observes statement-based semantics in order to
   * preserve legacy behavior.
   *
   * This method does not take the state of the parser into account, making no
   * distinction between global code and function code. Because the "missing
   * 'use strict'" warning is *also* reported at function boundaries, this
   * function interprets `strict` option values `true` and `undefined` as
   * equivalent.
   */
  stmtMissingStrict: function() {
    if (this.option.strict === "global") {
      return true;
    }

    if (this.option.strict === false) {
      return false;
    }

    if (this.option.globalstrict) {
      return true;
    }

    return false;
  },

  allowsGlobalUsd: function() {
    return this.option.strict === "global" || this.option.globalstrict ||
      this.option.module || this.impliedClosure();
  },

  /**
   * Determine if the current configuration describes an environment that is
   * wrapped in an immediately-invoked function expression prior to evaluation.
   *
   * @returns {boolean}
   */
  impliedClosure: function() {
    return this.option.node || this.option.phantom || this.option.browserify;
  },

  // Assumption: chronologically ES3 < ES5 < ES6 < Moz

  inMoz: function() {
    return this.option.moz;
  },

  /**
   * Determine if constructs introduced in ECMAScript 11 should be accepted.
   *
   * @returns {boolean}
   */
  inES11: function() {
    return this.esVersion >= 11;
  },

  /**
   * Determine if constructs introduced in ECMAScript 10 should be accepted.
   *
   * @returns {boolean}
   */
  inES10: function() {
    return this.esVersion >= 10;
  },

  /**
   * Determine if constructs introduced in ECMAScript 9 should be accepted.
   *
   * @returns {boolean}
   */
  inES9: function() {
    return this.esVersion >= 9;
  },

  /**
   * Determine if constructs introduced in ECMAScript 8 should be accepted.
   *
   * @returns {boolean}
   */
  inES8: function() {
    return this.esVersion >= 8;
  },

  /**
   * Determine if constructs introduced in ECMAScript 7 should be accepted.
   *
   * @returns {boolean}
   */
  inES7: function() {
    return this.esVersion >= 7;
  },

  /**
   * Determine if constructs introduced in ECMAScript 6 should be accepted.
   *
   * @param {boolean} strict - When `true`, do not interpret the `moz` option
   *                           as ECMAScript 6
   *
   * @returns {boolean}
   */
  inES6: function(strict) {
    if (!strict && this.option.moz) {
      return true;
    }

    return this.esVersion >= 6;
  },

  /**
   * Determine if constructs introduced in ECMAScript 5 should be accepted.
   *
   * @returns {boolean}
   */
  inES5: function() {
    return !this.esVersion || this.esVersion >= 5 || this.option.moz;
  },

  /**
   * Determine the current version of the input language by inspecting the
   * value of all ECMAScript-version-related options. This logic is necessary
   * to ensure compatibility with deprecated options `es3`, `es5`, and
   * `esnext`, and it may be drastically simplified when those options are
   * removed.
   *
   * @returns {string|null} - the name of any incompatible option detected,
   *                          `null` otherwise
   */
  inferEsVersion: function() {
    var badOpt = null;

    if (this.option.esversion) {
      if (this.option.es3) {
        badOpt = "es3";
      } else if (this.option.es5) {
        badOpt = "es5";
      } else if (this.option.esnext) {
        badOpt = "esnext";
      }

      if (badOpt) {
        return badOpt;
      }

      if (this.option.esversion === 2015) {
        this.esVersion = 6;
      } else {
        this.esVersion = this.option.esversion;
      }
    } else if (this.option.es3) {
      this.esVersion = 3;
    } else if (this.option.esnext) {
      this.esVersion = 6;
    }

    return null;
  },

  reset: function() {
    this.tokens = {
      prev: null,
      next: null,
      curr: null
    };

    this.option = { unstable: {} };
    this.esVersion = 5;
    this.funct = null;
    this.ignored = {};
    /**
     * A lookup table for active directives whose keys are the value of the
     * directives and whose values are the tokens which enabled the directives.
     */
    this.directive = Object.create(null);
    this.jsonMode = false;
    this.lines = [];
    this.tab = "";
    this.cache = {}; // Node.JS doesn't have Map. Sniff.
    this.ignoredLines = {};
    this.forinifcheckneeded = false;
    this.nameStack = new NameStack();
    this.inClassBody = false;
  }
};

exports.state = state;

},{"./name-stack.js":19}],25:[function(require,module,exports){
"use strict";

exports.register = function(linter) {
  // Check for properties named __proto__. This special property was
  // deprecated and then re-introduced for ES6.

  linter.on("Identifier", function style_scanProto(data) {
    if (linter.getOption("proto")) {
      return;
    }

    if (data.name === "__proto__") {
      linter.warn("W103", {
        line: data.line,
        char: data.char,
        data: [ data.name, "6" ]
      });
    }
  });

  // Check for properties named __iterator__. This is a special property
  // available only in browsers with JavaScript 1.7 implementation, but
  // it is deprecated for ES6

  linter.on("Identifier", function style_scanIterator(data) {
    if (linter.getOption("iterator")) {
      return;
    }

    if (data.name === "__iterator__") {
      linter.warn("W103", {
        line: data.line,
        char: data.char,
        data: [ data.name ]
      });
    }
  });

  // Check that all identifiers are using camelCase notation.
  // Exceptions: names like MY_VAR and _myVar.

  linter.on("Identifier", function style_scanCamelCase(data) {
    if (!linter.getOption("camelcase")) {
      return;
    }

    if (data.name.replace(/^_+|_+$/g, "").indexOf("_") > -1 && !data.name.match(/^[A-Z0-9_]*$/)) {
      linter.warn("W106", {
        line: data.line,
        char: data.char,
        data: [ data.name ]
      });
    }
  });

  // Enforce consistency in style of quoting.

  linter.on("String", function style_scanQuotes(data) {
    var quotmark = linter.getOption("quotmark");
    var code;

    if (!quotmark) {
      return;
    }

    // If quotmark is set to 'single' warn about all double-quotes.

    if (quotmark === "single" && data.quote !== "'") {
      code = "W109";
    }

    // If quotmark is set to 'double' warn about all single-quotes.

    if (quotmark === "double" && data.quote !== "\"") {
      code = "W108";
    }

    // If quotmark is set to true, remember the first quotation style
    // and then warn about all others.

    if (quotmark === true) {
      if (!linter.getCache("quotmark")) {
        linter.setCache("quotmark", data.quote);
      }

      if (linter.getCache("quotmark") !== data.quote) {
        code = "W110";
      }
    }

    if (code) {
      linter.warn(code, {
        line: data.line,
        char: data.char,
      });
    }
  });

  linter.on("Number", function style_scanNumbers(data) {
    if (data.value.charAt(0) === ".") {
      // Warn about a leading decimal point.
      linter.warn("W008", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }

    if (data.value.substr(data.value.length - 1) === ".") {
      // Warn about a trailing decimal point.
      linter.warn("W047", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }

    if (/^00+/.test(data.value)) {
      // Multiple leading zeroes.
      linter.warn("W046", {
        line: data.line,
        char: data.char,
        data: [ data.value ]
      });
    }
  });

  // Warn about script URLs.

  linter.on("String", function style_scanJavaScriptURLs(data) {
    var re = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;

    if (linter.getOption("scripturl")) {
      return;
    }

    if (re.test(data.value)) {
      linter.warn("W107", {
        line: data.line,
        char: data.char
      });
    }
  });
};

},{}],26:[function(require,module,exports){
/*
 * Determine whether a given string is a valid UnicodePropertyValueExpression.
 */

"use strict";

module.exports = function validate(sequence) {
  var equalSignIndex = sequence.indexOf("=");

  if (equalSignIndex === -1) {
    return sequence in names.binary || sequence in values.general;
  }

  var name = sequence.substr(0, equalSignIndex);
  var value = sequence.substr(equalSignIndex + 1);

  if (name === "General_Category" || name === "gc") {
    return value in values.general;
  } if (name === "Script" || name === "sc" || name === "Script_Extensions" || name === "scx") {
    return value in values.script;
  }

  return false;
};


var names = {
  nonBinary: Object.create(null),
  binary: Object.create(null)
};
var values = {
  general: Object.create(null),
  script: Object.create(null)
};

var nb = names.nonBinary;
nb.General_Category = true;
nb.gc = true;
nb.Script = true;
nb.sc = true;
nb.Script_Extensions = true;
nb.scx = true;

var b = names.binary;
b.ASCII = true;
b.ASCII_Hex_Digit = true;
b.AHex = true;
b.Alphabetic = true;
b.Alpha = true;
b.Any = true;
b.Assigned = true;
b.Bidi_Control = true;
b.Bidi_C = true;
b.Bidi_Mirrored = true;
b.Bidi_M = true;
b.Case_Ignorable = true;
b.CI = true;
b.Cased = true;
b.Changes_When_Casefolded = true;
b.CWCF = true;
b.Changes_When_Casemapped = true;
b.CWCM = true;
b.Changes_When_Lowercased = true;
b.CWL = true;
b.Changes_When_NFKC_Casefolded = true;
b.CWKCF = true;
b.Changes_When_Titlecased = true;
b.CWT = true;
b.Changes_When_Uppercased = true;
b.CWU = true;
b.Dash = true;
b.Default_Ignorable_Code_Point = true;
b.DI = true;
b.Deprecated = true;
b.Dep = true;
b.Diacritic = true;
b.Dia = true;
b.Emoji = true;
b.Emoji_Component = true;
b.EComp = true;
b.Emoji_Modifier = true;
b.EMod = true;
b.Emoji_Modifier_Base = true;
b.EBase = true;
b.Emoji_Presentation = true;
b.EPres = true;
b.Extended_Pictographic = true;
b.ExtPict = true;
b.Extender = true;
b.Ext = true;
b.Grapheme_Base = true;
b.Gr_Base = true;
b.Grapheme_Extend = true;
b.Gr_Ext = true;
b.Hex_Digit = true;
b.Hex = true;
b.IDS_Binary_Operator = true;
b.IDSB = true;
b.IDS_Trinary_Operator = true;
b.IDST = true;
b.ID_Continue = true;
b.IDC = true;
b.ID_Start = true;
b.IDS = true;
b.Ideographic = true;
b.Ideo = true;
b.Join_Control = true;
b.Join_C = true;
b.Logical_Order_Exception = true;
b.LOE = true;
b.Lowercase = true;
b.Lower = true;
b.Math = true;
b.Noncharacter_Code_Point = true;
b.NChar = true;
b.Pattern_Syntax = true;
b.Pat_Syn = true;
b.Pattern_White_Space = true;
b.Pat_WS = true;
b.Quotation_Mark = true;
b.QMark = true;
b.Radical = true;
b.Regional_Indicator = true;
b.RI = true;
b.Sentence_Terminal = true;
b.STerm = true;
b.Soft_Dotted = true;
b.SD = true;
b.Terminal_Punctuation = true;
b.Term = true;
b.Unified_Ideograph = true;
b.UIdeo = true;
b.Uppercase = true;
b.Upper = true;
b.Variation_Selector = true;
b.VS = true;
b.White_Space = true;
b.space = true;
b.XID_Continue = true;
b.XIDC = true;
b.XID_Start = true;
b.XIDS = true;

var g = values.general;
g.Cased_Letter = true;
g.LC = true;
g.Close_Punctuation = true;
g.Pe = true;
g.Connector_Punctuation = true;
g.Pc = true;
g.Control = true;
g.Cc = true;
g.cntrl = true;
g.Currency_Symbol = true;
g.Sc = true;
g.Dash_Punctuation = true;
g.Pd = true;
g.Decimal_Number = true;
g.Nd = true;
g.digit = true;
g.Enclosing_Mark = true;
g.Me = true;
g.Final_Punctuation = true;
g.Pf = true;
g.Format = true;
g.Cf = true;
g.Initial_Punctuation = true;
g.Pi = true;
g.Letter = true;
g.L = true;
g.Letter_Number = true;
g.Nl = true;
g.Line_Separator = true;
g.Zl = true;
g.Lowercase_Letter = true;
g.Ll = true;
g.Mark = true;
g.M = true;
g.Combining_Mark = true;
g.Math_Symbol = true;
g.Sm = true;
g.Modifier_Letter = true;
g.Lm = true;
g.Modifier_Symbol = true;
g.Sk = true;
g.Nonspacing_Mark = true;
g.Mn = true;
g.Number = true;
g.N = true;
g.Open_Punctuation = true;
g.Ps = true;
g.Other = true;
g.C = true;
g.Other_Letter = true;
g.Lo = true;
g.Other_Number = true;
g.No = true;
g.Other_Punctuation = true;
g.Po = true;
g.Other_Symbol = true;
g.So = true;
g.Paragraph_Separator = true;
g.Zp = true;
g.Private_Use = true;
g.Co = true;
g.Punctuation = true;
g.P = true;
g.punct = true;
g.Separator = true;
g.Z = true;
g.Space_Separator = true;
g.Zs = true;
g.Spacing_Mark = true;
g.Mc = true;
g.Surrogate = true;
g.Cs = true;
g.Symbol = true;
g.S = true;
g.Titlecase_Letter = true;
g.Lt = true;
g.Unassigned = true;
g.Cn = true;
g.Uppercase_Letter = true;
g.Lu = true;

var s = values.script;
s.Adlam = true;
s.Adlm = true;
s.Ahom = true;
s.Anatolian_Hieroglyphs = true;
s.Hluw = true;
s.Arabic = true;
s.Arab = true;
s.Armenian = true;
s.Armn = true;
s.Avestan = true;
s.Avst = true;
s.Balinese = true;
s.Bali = true;
s.Bamum = true;
s.Bamu = true;
s.Bassa_Vah = true;
s.Bass = true;
s.Batak = true;
s.Batk = true;
s.Bengali = true;
s.Beng = true;
s.Bhaiksuki = true;
s.Bhks = true;
s.Bopomofo = true;
s.Bopo = true;
s.Brahmi = true;
s.Brah = true;
s.Braille = true;
s.Brai = true;
s.Buginese = true;
s.Bugi = true;
s.Buhid = true;
s.Buhd = true;
s.Canadian_Aboriginal = true;
s.Cans = true;
s.Carian = true;
s.Cari = true;
s.Caucasian_Albanian = true;
s.Aghb = true;
s.Chakma = true;
s.Cakm = true;
s.Cham = true;
s.Chorasmian = true;
s.Chrs = true;
s.Cherokee = true;
s.Cher = true;
s.Common = true;
s.Zyyy = true;
s.Coptic = true;
s.Copt = true;
s.Qaac = true;
s.Cuneiform = true;
s.Xsux = true;
s.Cypriot = true;
s.Cprt = true;
s.Cyrillic = true;
s.Cyrl = true;
s.Deseret = true;
s.Dsrt = true;
s.Devanagari = true;
s.Deva = true;
s.Dives_Akuru = true;
s.Diak = true;
s.Dogra = true;
s.Dogr = true;
s.Duployan = true;
s.Dupl = true;
s.Egyptian_Hieroglyphs = true;
s.Egyp = true;
s.Elbasan = true;
s.Elba = true;
s.Elymaic = true;
s.Elym = true;
s.Ethiopic = true;
s.Ethi = true;
s.Georgian = true;
s.Geor = true;
s.Glagolitic = true;
s.Glag = true;
s.Gothic = true;
s.Goth = true;
s.Grantha = true;
s.Gran = true;
s.Greek = true;
s.Grek = true;
s.Gujarati = true;
s.Gujr = true;
s.Gunjala_Gondi = true;
s.Gong = true;
s.Gurmukhi = true;
s.Guru = true;
s.Han = true;
s.Hani = true;
s.Hangul = true;
s.Hang = true;
s.Hanifi_Rohingya = true;
s.Rohg = true;
s.Hanunoo = true;
s.Hano = true;
s.Hatran = true;
s.Hatr = true;
s.Hebrew = true;
s.Hebr = true;
s.Hiragana = true;
s.Hira = true;
s.Imperial_Aramaic = true;
s.Armi = true;
s.Inherited = true;
s.Zinh = true;
s.Qaai = true;
s.Inscriptional_Pahlavi = true;
s.Phli = true;
s.Inscriptional_Parthian = true;
s.Prti = true;
s.Javanese = true;
s.Java = true;
s.Kaithi = true;
s.Kthi = true;
s.Kannada = true;
s.Knda = true;
s.Katakana = true;
s.Kana = true;
s.Kayah_Li = true;
s.Kali = true;
s.Kharoshthi = true;
s.Khar = true;
s.Khitan_Small_Script = true;
s.Kits = true;
s.Khmer = true;
s.Khmr = true;
s.Khojki = true;
s.Khoj = true;
s.Khudawadi = true;
s.Sind = true;
s.Lao = true;
s.Laoo = true;
s.Latin = true;
s.Latn = true;
s.Lepcha = true;
s.Lepc = true;
s.Limbu = true;
s.Limb = true;
s.Linear_A = true;
s.Lina = true;
s.Linear_B = true;
s.Linb = true;
s.Lisu = true;
s.Lycian = true;
s.Lyci = true;
s.Lydian = true;
s.Lydi = true;
s.Mahajani = true;
s.Mahj = true;
s.Makasar = true;
s.Maka = true;
s.Malayalam = true;
s.Mlym = true;
s.Mandaic = true;
s.Mand = true;
s.Manichaean = true;
s.Mani = true;
s.Marchen = true;
s.Marc = true;
s.Medefaidrin = true;
s.Medf = true;
s.Masaram_Gondi = true;
s.Gonm = true;
s.Meetei_Mayek = true;
s.Mtei = true;
s.Mende_Kikakui = true;
s.Mend = true;
s.Meroitic_Cursive = true;
s.Merc = true;
s.Meroitic_Hieroglyphs = true;
s.Mero = true;
s.Miao = true;
s.Plrd = true;
s.Modi = true;
s.Mongolian = true;
s.Mong = true;
s.Mro = true;
s.Mroo = true;
s.Multani = true;
s.Mult = true;
s.Myanmar = true;
s.Mymr = true;
s.Nabataean = true;
s.Nbat = true;
s.Nandinagari = true;
s.Nand = true;
s.New_Tai_Lue = true;
s.Talu = true;
s.Newa = true;
s.Nko = true;
s.Nkoo = true;
s.Nushu = true;
s.Nshu = true;
s.Nyiakeng_Puachue_Hmong = true;
s.Hmnp = true;
s.Ogham = true;
s.Ogam = true;
s.Ol_Chiki = true;
s.Olck = true;
s.Old_Hungarian = true;
s.Hung = true;
s.Old_Italic = true;
s.Ital = true;
s.Old_North_Arabian = true;
s.Narb = true;
s.Old_Permic = true;
s.Perm = true;
s.Old_Persian = true;
s.Xpeo = true;
s.Old_Sogdian = true;
s.Sogo = true;
s.Old_South_Arabian = true;
s.Sarb = true;
s.Old_Turkic = true;
s.Orkh = true;
s.Oriya = true;
s.Orya = true;
s.Osage = true;
s.Osge = true;
s.Osmanya = true;
s.Osma = true;
s.Pahawh_Hmong = true;
s.Hmng = true;
s.Palmyrene = true;
s.Palm = true;
s.Pau_Cin_Hau = true;
s.Pauc = true;
s.Phags_Pa = true;
s.Phag = true;
s.Phoenician = true;
s.Phnx = true;
s.Psalter_Pahlavi = true;
s.Phlp = true;
s.Rejang = true;
s.Rjng = true;
s.Runic = true;
s.Runr = true;
s.Samaritan = true;
s.Samr = true;
s.Saurashtra = true;
s.Saur = true;
s.Sharada = true;
s.Shrd = true;
s.Shavian = true;
s.Shaw = true;
s.Siddham = true;
s.Sidd = true;
s.SignWriting = true;
s.Sgnw = true;
s.Sinhala = true;
s.Sinh = true;
s.Sogdian = true;
s.Sogd = true;
s.Sora_Sompeng = true;
s.Sora = true;
s.Soyombo = true;
s.Soyo = true;
s.Sundanese = true;
s.Sund = true;
s.Syloti_Nagri = true;
s.Sylo = true;
s.Syriac = true;
s.Syrc = true;
s.Tagalog = true;
s.Tglg = true;
s.Tagbanwa = true;
s.Tagb = true;
s.Tai_Le = true;
s.Tale = true;
s.Tai_Tham = true;
s.Lana = true;
s.Tai_Viet = true;
s.Tavt = true;
s.Takri = true;
s.Takr = true;
s.Tamil = true;
s.Taml = true;
s.Tangut = true;
s.Tang = true;
s.Telugu = true;
s.Telu = true;
s.Thaana = true;
s.Thaa = true;
s.Thai = true;
s.Tibetan = true;
s.Tibt = true;
s.Tifinagh = true;
s.Tfng = true;
s.Tirhuta = true;
s.Tirh = true;
s.Ugaritic = true;
s.Ugar = true;
s.Vai = true;
s.Vaii = true;
s.Wancho = true;
s.Wcho = true;
s.Warang_Citi = true;
s.Wara = true;
s.Yezidi = true;
s.Yezi = true;
s.Yi = true;
s.Yiii = true;
s.Zanabazar_Square = true;
s.Zanb = true;

},{}],27:[function(require,module,exports){
// jshint -W001

"use strict";

// Identifiers provided by the ECMAScript standard.

exports.reservedVars = {
  NaN       : false,
  undefined : false
};

exports.ecmaIdentifiers = {
  3: {
    Array              : false,
    Boolean            : false,
    Date               : false,
    decodeURI          : false,
    decodeURIComponent : false,
    encodeURI          : false,
    encodeURIComponent : false,
    Error              : false,
    "eval"             : false,
    EvalError          : false,
    Function           : false,
    hasOwnProperty     : false,
    Infinity           : false,
    isFinite           : false,
    isNaN              : false,
    Math               : false,
    Number             : false,
    Object             : false,
    parseInt           : false,
    parseFloat         : false,
    RangeError         : false,
    ReferenceError     : false,
    RegExp             : false,
    String             : false,
    SyntaxError        : false,
    TypeError          : false,
    URIError           : false
  },
  5: {
    JSON               : false
  },
  6: {
    ArrayBuffer        : false,
    DataView           : false,
    Float32Array       : false,
    Float64Array       : false,
    Int8Array          : false,
    Int16Array         : false,
    Int32Array         : false,
    Map                : false,
    Promise            : false,
    Proxy              : false,
    Reflect            : false,
    Set                : false,
    Symbol             : false,
    Uint8Array         : false,
    Uint16Array        : false,
    Uint32Array        : false,
    Uint8ClampedArray  : false,
    WeakMap            : false,
    WeakSet            : false
  },
  8: {
    Atomics            : false,
    SharedArrayBuffer  : false
  },
  11: {
    BigInt             : false,
    globalThis         : false
  }
};

// Global variables commonly provided by a web browser environment.

exports.browser = {
  Audio                : false,
  Blob                 : false,
  addEventListener     : false, // EventTarget
  applicationCache     : false,
  atob                 : false, // WindowOrWorkerGlobalScope
  blur                 : false,
  btoa                 : false, // WindowOrWorkerGlobalScope
  cancelAnimationFrame : false,
  CanvasGradient       : false,
  CanvasPattern        : false,
  CanvasRenderingContext2D: false,
  CSS                  : false,
  CSSImportRule        : false,
  CSSGroupingRule      : false,
  CSSMarginRule        : false,
  CSSMediaRule         : false,
  CSSNamespaceRule     : false,
  CSSPageRule          : false,
  CSSRule              : false,
  CSSRuleList          : false,
  CSSStyleDeclaration  : false,
  CSSStyleRule         : false,
  CSSStyleSheet        : false,
  clearInterval        : false, // WindowOrWorkerGlobalScope
  clearTimeout         : false, // WindowOrWorkerGlobalScope
  close                : false,
  closed               : false,
  Comment              : false,
  CompositionEvent     : false,
  createImageBitmap    : false, // WindowOrWorkerGlobalScope
  CustomEvent          : false,
  DOMParser            : false,
  defaultStatus        : false,
  dispatchEvent        : false, // EventTarget
  Document             : false,
  document             : false,
  DocumentFragment     : false,
  Element              : false,
  ElementTimeControl   : false,
  Event                : false,
  event                : false,
  fetch                : false,
  File                 : false,
  FileList             : false,
  FileReader           : false,
  FormData             : false,
  focus                : false,
  frames               : false,
  getComputedStyle     : false,
  Headers              : false,
  HTMLAnchorElement    : false,
  HTMLAreaElement      : false,
  HTMLAudioElement     : false,
  HTMLBaseElement      : false,
  HTMLBlockquoteElement: false,
  HTMLBodyElement      : false,
  HTMLBRElement        : false,
  HTMLButtonElement    : false,
  HTMLCanvasElement    : false,
  HTMLCollection       : false,
  HTMLDataElement      : false,
  HTMLDataListElement  : false,
  HTMLDetailsElement   : false,
  HTMLDialogElement    : false,
  HTMLDirectoryElement : false,
  HTMLDivElement       : false,
  HTMLDListElement     : false,
  HTMLElement          : false,
  HTMLEmbedElement     : false,
  HTMLFieldSetElement  : false,
  HTMLFontElement      : false,
  HTMLFormElement      : false,
  HTMLFrameElement     : false,
  HTMLFrameSetElement  : false,
  HTMLHeadElement      : false,
  HTMLHeadingElement   : false,
  HTMLHRElement        : false,
  HTMLHtmlElement      : false,
  HTMLIFrameElement    : false,
  HTMLImageElement     : false,
  HTMLInputElement     : false,
/* HTMLIsIndexElement was removed from the WHATWG HTML spec;
   see https://github.com/whatwg/html/pull/1095.
   HTMLIsIndexElement has been removed from browsers; see:
   • Chromium Removal: https://codereview.chromium.org/96653004/
   • Gecko Removal: https://bugzilla.mozilla.org/show_bug.cgi?id=1266495
   • WebKit Removal: https://bugs.webkit.org/show_bug.cgi?id=7139.
   See also the discussion at https://github.com/jshint/jshint/pull/3222. */
  HTMLIsIndexElement   : false,
  HTMLLabelElement     : false,
  HTMLLayerElement     : false,
  HTMLLegendElement    : false,
  HTMLLIElement        : false,
  HTMLLinkElement      : false,
  HTMLMapElement       : false,
  HTMLMarqueeElement   : false,
  HTMLMediaElement     : false,
  HTMLMenuElement      : false,
  HTMLMetaElement      : false,
  HTMLMeterElement     : false,
  HTMLModElement       : false,
  HTMLObjectElement    : false,
  HTMLOListElement     : false,
  HTMLOptGroupElement  : false,
  HTMLOptionElement    : false,
  HTMLParagraphElement : false,
  HTMLParamElement     : false,
  HTMLPictureElement   : false,
  HTMLPreElement       : false,
  HTMLProgressElement  : false,
  HTMLQuoteElement     : false,
  HTMLScriptElement    : false,
  HTMLSelectElement    : false,
  HTMLSlotElement      : false,
  HTMLSourceElement    : false,
  HTMLStyleElement     : false,
  HTMLTableCaptionElement: false,
  HTMLTableCellElement : false,
  HTMLTableColElement  : false,
  HTMLTableElement     : false,
  HTMLTableRowElement  : false,
  HTMLTableSectionElement: false,
  HTMLTemplateElement  : false,
  HTMLTextAreaElement  : false,
  HTMLTimeElement      : false,
  HTMLTitleElement     : false,
  HTMLTrackElement     : false,
  HTMLUListElement     : false,
  HTMLVideoElement     : false,
  history              : false,
  Image                : false,
  IntersectionObserver : false,
  Intl                 : false,
  length               : false,
  localStorage         : false,
  location             : false,
  matchMedia           : false,
  MediaList            : false,
  MediaRecorder        : false,
  MessageChannel       : false,
  MessageEvent         : false,
  MessagePort          : false,
  MouseEvent           : false,
  moveBy               : false,
  moveTo               : false,
  MutationObserver     : false,
  name                 : false,
  Node                 : false,
  NodeFilter           : false,
  NodeList             : false,
  Notification         : false,
  navigator            : false,
  onbeforeunload       : true,
  onblur               : true,
  onerror              : true,
  onfocus              : true,
  onload               : true,
  onresize             : true,
  onunload             : true,
  open                 : false,
  openDatabase         : false,
  opener               : false,
  Option               : false,
  origin               : false, // WindowOrWorkerGlobalScope
  parent               : false,
  performance          : false,
  print                : false,
  queueMicrotask       : false, // WindowOrWorkerGlobalScope
  Range                : false,
  requestAnimationFrame : false,
  removeEventListener  : false, // EventTarget
  Request              : false,
  resizeBy             : false,
  resizeTo             : false,
  Response             : false,
  screen               : false,
  scroll               : false,
  scrollBy             : false,
  scrollTo             : false,
  sessionStorage       : false,
  setInterval          : false, // WindowOrWorkerGlobalScope
  setTimeout           : false, // WindowOrWorkerGlobalScope
  SharedWorker         : false,
  status               : false,
  Storage              : false,
  StyleSheet           : false,
  SVGAElement          : false,
  SVGAltGlyphDefElement: false,
  SVGAltGlyphElement   : false,
  SVGAltGlyphItemElement: false,
  SVGAngle             : false,
  SVGAnimateColorElement: false,
  SVGAnimateElement    : false,
  SVGAnimateMotionElement: false,
  SVGAnimateTransformElement: false,
  SVGAnimatedAngle     : false,
  SVGAnimatedBoolean   : false,
  SVGAnimatedEnumeration: false,
  SVGAnimatedInteger   : false,
  SVGAnimatedLength    : false,
  SVGAnimatedLengthList: false,
  SVGAnimatedNumber    : false,
  SVGAnimatedNumberList: false,
  SVGAnimatedPathData  : false,
  SVGAnimatedPoints    : false,
  SVGAnimatedPreserveAspectRatio: false,
  SVGAnimatedRect      : false,
  SVGAnimatedString    : false,
  SVGAnimatedTransformList: false,
  SVGAnimationElement  : false,
  SVGCSSRule           : false,
  SVGCircleElement     : false,
  SVGClipPathElement   : false,
  SVGColor             : false,
  SVGColorProfileElement: false,
  SVGColorProfileRule  : false,
  SVGComponentTransferFunctionElement: false,
  SVGCursorElement     : false,
  SVGDefsElement       : false,
  SVGDescElement       : false,
  SVGDocument          : false,
  SVGElement           : false,
  SVGElementInstance   : false,
  SVGElementInstanceList: false,
  SVGEllipseElement    : false,
  SVGExternalResourcesRequired: false,
  SVGFEBlendElement    : false,
  SVGFEColorMatrixElement: false,
  SVGFEComponentTransferElement: false,
  SVGFECompositeElement: false,
  SVGFEConvolveMatrixElement: false,
  SVGFEDiffuseLightingElement: false,
  SVGFEDisplacementMapElement: false,
  SVGFEDistantLightElement: false,
  SVGFEFloodElement    : false,
  SVGFEFuncAElement    : false,
  SVGFEFuncBElement    : false,
  SVGFEFuncGElement    : false,
  SVGFEFuncRElement    : false,
  SVGFEGaussianBlurElement: false,
  SVGFEImageElement    : false,
  SVGFEMergeElement    : false,
  SVGFEMergeNodeElement: false,
  SVGFEMorphologyElement: false,
  SVGFEOffsetElement   : false,
  SVGFEPointLightElement: false,
  SVGFESpecularLightingElement: false,
  SVGFESpotLightElement: false,
  SVGFETileElement     : false,
  SVGFETurbulenceElement: false,
  SVGFilterElement     : false,
  SVGFilterPrimitiveStandardAttributes: false,
  SVGFitToViewBox      : false,
  SVGFontElement       : false,
  SVGFontFaceElement   : false,
  SVGFontFaceFormatElement: false,
  SVGFontFaceNameElement: false,
  SVGFontFaceSrcElement: false,
  SVGFontFaceUriElement: false,
  SVGForeignObjectElement: false,
  SVGGElement          : false,
  SVGGlyphElement      : false,
  SVGGlyphRefElement   : false,
  SVGGradientElement   : false,
  SVGHKernElement      : false,
  SVGICCColor          : false,
  SVGImageElement      : false,
  SVGLangSpace         : false,
  SVGLength            : false,
  SVGLengthList        : false,
  SVGLineElement       : false,
  SVGLinearGradientElement: false,
  SVGLocatable         : false,
  SVGMPathElement      : false,
  SVGMarkerElement     : false,
  SVGMaskElement       : false,
  SVGMatrix            : false,
  SVGMetadataElement   : false,
  SVGMissingGlyphElement: false,
  SVGNumber            : false,
  SVGNumberList        : false,
  SVGPaint             : false,
  SVGPathElement       : false,
  SVGPathSeg           : false,
  SVGPathSegArcAbs     : false,
  SVGPathSegArcRel     : false,
  SVGPathSegClosePath  : false,
  SVGPathSegCurvetoCubicAbs: false,
  SVGPathSegCurvetoCubicRel: false,
  SVGPathSegCurvetoCubicSmoothAbs: false,
  SVGPathSegCurvetoCubicSmoothRel: false,
  SVGPathSegCurvetoQuadraticAbs: false,
  SVGPathSegCurvetoQuadraticRel: false,
  SVGPathSegCurvetoQuadraticSmoothAbs: false,
  SVGPathSegCurvetoQuadraticSmoothRel: false,
  SVGPathSegLinetoAbs  : false,
  SVGPathSegLinetoHorizontalAbs: false,
  SVGPathSegLinetoHorizontalRel: false,
  SVGPathSegLinetoRel  : false,
  SVGPathSegLinetoVerticalAbs: false,
  SVGPathSegLinetoVerticalRel: false,
  SVGPathSegList       : false,
  SVGPathSegMovetoAbs  : false,
  SVGPathSegMovetoRel  : false,
  SVGPatternElement    : false,
  SVGPoint             : false,
  SVGPointList         : false,
  SVGPolygonElement    : false,
  SVGPolylineElement   : false,
  SVGPreserveAspectRatio: false,
  SVGRadialGradientElement: false,
  SVGRect              : false,
  SVGRectElement       : false,
  SVGRenderingIntent   : false,
  SVGSVGElement        : false,
  SVGScriptElement     : false,
  SVGSetElement        : false,
  SVGStopElement       : false,
  SVGStringList        : false,
  SVGStylable          : false,
  SVGStyleElement      : false,
  SVGSwitchElement     : false,
  SVGSymbolElement     : false,
  SVGTRefElement       : false,
  SVGTSpanElement      : false,
  SVGTests             : false,
  SVGTextContentElement: false,
  SVGTextElement       : false,
  SVGTextPathElement   : false,
  SVGTextPositioningElement: false,
  SVGTitleElement      : false,
  SVGTransform         : false,
  SVGTransformList     : false,
  SVGTransformable     : false,
  SVGURIReference      : false,
  SVGUnitTypes         : false,
  SVGUseElement        : false,
  SVGVKernElement      : false,
  SVGViewElement       : false,
  SVGViewSpec          : false,
  SVGZoomAndPan        : false,
  Text                 : false,
  TextDecoder          : false,
  TextEncoder          : false,
  TimeEvent            : false,
  top                  : false,
  URL                  : false,
  URLSearchParams      : false,
  WebGLActiveInfo      : false,
  WebGLBuffer          : false,
  WebGLContextEvent    : false,
  WebGLFramebuffer     : false,
  WebGLProgram         : false,
  WebGLRenderbuffer    : false,
  WebGLRenderingContext: false,
  WebGLShader          : false,
  WebGLShaderPrecisionFormat: false,
  WebGLTexture         : false,
  WebGLUniformLocation : false,
  WebSocket            : false,
  window               : false,
  Window               : false,
  Worker               : false,
  XDomainRequest       : false,
  XMLDocument          : false,
  XMLHttpRequest       : false,
  XMLSerializer        : false,
  XPathEvaluator       : false,
  XPathException       : false,
  XPathExpression      : false,
  XPathNamespace       : false,
  XPathNSResolver      : false,
  XPathResult          : false
};

exports.devel = {
  alert  : false,
  confirm: false,
  console: false,
  Debug  : false,
  opera  : false,
  prompt : false
};

exports.worker = {
  addEventListener    : true, // EventTarget
  atob                : true, // WindowOrWorkerGlobalScope
  btoa                : true, // WindowOrWorkerGlobalScope
  clearInterval       : true, // WindowOrWorkerGlobalScope
  clearTimeout        : true, // WindowOrWorkerGlobalScope
  createImageBitmap   : true, // WindowOrWorkerGlobalScope
  dispatchEvent       : true, // EventTarget
  importScripts       : true,
  onmessage           : true,
  origin              : true, // WindowOrWorkerGlobalScope
  postMessage         : true,
  queueMicrotask      : true, // WindowOrWorkerGlobalScope
  removeEventListener : true, // EventTarget
  self                : true,
  setInterval         : true, // WindowOrWorkerGlobalScope
  setTimeout          : true, // WindowOrWorkerGlobalScope
  FileReaderSync      : true
};

// Widely adopted global names that are not part of ECMAScript standard
exports.nonstandard = {
  escape  : false,
  unescape: false
};

// Globals provided by popular JavaScript environments.

exports.couch = {
  "require" : false,
  respond   : false,
  getRow    : false,
  emit      : false,
  send      : false,
  start     : false,
  sum       : false,
  log       : false,
  exports   : false,
  module    : false,
  provides  : false
};

exports.node = {
  __filename    : false,
  __dirname     : false,
  arguments     : false,
  GLOBAL        : false,
  global        : false,
  module        : false,
  require       : false,
  Intl          : false,

  // These globals are writeable because Node allows the following
  // usage pattern: var Buffer = require("buffer").Buffer;

  Buffer         : true,
  console        : true,
  exports        : true,
  process        : true,
  setTimeout     : true,
  clearTimeout   : true,
  setInterval    : true,
  clearInterval  : true,
  setImmediate   : true, // v0.9.1+
  clearImmediate : true, // v0.9.1+
  URL            : true, // v10.0.0+
  URLSearchParams: true  // v10.0.0+
};

exports.browserify = {
  __filename    : false,
  __dirname     : false,
  global        : false,
  module        : false,
  require       : false,
  Buffer        : true,
  exports       : true,
  process       : true
};

exports.phantom = {
  phantom      : true,
  require      : true,
  WebPage      : true,
  console      : true, // in examples, but undocumented
  exports      : true  // v1.7+
};

exports.qunit = {
  asyncTest      : false,
  deepEqual      : false,
  equal          : false,
  expect         : false,
  module         : false,
  notDeepEqual   : false,
  notEqual       : false,
  notOk          : false,
  notPropEqual   : false,
  notStrictEqual : false,
  ok             : false,
  propEqual      : false,
  QUnit          : false,
  raises         : false,
  start          : false,
  stop           : false,
  strictEqual    : false,
  test           : false,
  "throws"       : false
};

exports.rhino = {
  arguments    : false,
  defineClass  : false,
  deserialize  : false,
  gc           : false,
  help         : false,
  importClass  : false,
  importPackage: false,
  "java"       : false,
  load         : false,
  loadClass    : false,
  Packages     : false,
  print        : false,
  quit         : false,
  readFile     : false,
  readUrl      : false,
  runCommand   : false,
  seal         : false,
  serialize    : false,
  spawn        : false,
  sync         : false,
  toint32      : false,
  version      : false
};

exports.shelljs = {
  target       : false,
  echo         : false,
  exit         : false,
  cd           : false,
  pwd          : false,
  ls           : false,
  find         : false,
  cp           : false,
  rm           : false,
  mv           : false,
  mkdir        : false,
  test         : false,
  cat          : false,
  sed          : false,
  grep         : false,
  which        : false,
  dirs         : false,
  pushd        : false,
  popd         : false,
  env          : false,
  exec         : false,
  chmod        : false,
  config       : false,
  error        : false,
  tempdir      : false
};

exports.typed = {
  ArrayBuffer         : false,
  ArrayBufferView     : false,
  DataView            : false,
  Float32Array        : false,
  Float64Array        : false,
  Int16Array          : false,
  Int32Array          : false,
  Int8Array           : false,
  Uint16Array         : false,
  Uint32Array         : false,
  Uint8Array          : false,
  Uint8ClampedArray   : false
};

exports.wsh = {
  ActiveXObject            : true,
  Enumerator               : true,
  GetObject                : true,
  ScriptEngine             : true,
  ScriptEngineBuildVersion : true,
  ScriptEngineMajorVersion : true,
  ScriptEngineMinorVersion : true,
  VBArray                  : true,
  WSH                      : true,
  WScript                  : true,
  XDomainRequest           : true
};

// Globals provided by popular JavaScript libraries.

exports.dojo = {
  dojo     : false,
  dijit    : false,
  dojox    : false,
  define   : false,
  "require": false
};

exports.jquery = {
  "$"    : false,
  jQuery : false
};

exports.mootools = {
  "$"           : false,
  "$$"          : false,
  Asset         : false,
  Browser       : false,
  Chain         : false,
  Class         : false,
  Color         : false,
  Cookie        : false,
  Core          : false,
  Document      : false,
  DomReady      : false,
  DOMEvent      : false,
  DOMReady      : false,
  Drag          : false,
  Element       : false,
  Elements      : false,
  Event         : false,
  Events        : false,
  Fx            : false,
  Group         : false,
  Hash          : false,
  HtmlTable     : false,
  IFrame        : false,
  IframeShim    : false,
  InputValidator: false,
  instanceOf    : false,
  Keyboard      : false,
  Locale        : false,
  Mask          : false,
  MooTools      : false,
  Native        : false,
  Options       : false,
  OverText      : false,
  Request       : false,
  Scroller      : false,
  Slick         : false,
  Slider        : false,
  Sortables     : false,
  Spinner       : false,
  Swiff         : false,
  Tips          : false,
  Type          : false,
  typeOf        : false,
  URI           : false,
  Window        : false
};

exports.prototypejs = {
  "$"               : false,
  "$$"              : false,
  "$A"              : false,
  "$F"              : false,
  "$H"              : false,
  "$R"              : false,
  "$break"          : false,
  "$continue"       : false,
  "$w"              : false,
  Abstract          : false,
  Ajax              : false,
  Class             : false,
  Enumerable        : false,
  Element           : false,
  Event             : false,
  Field             : false,
  Form              : false,
  Hash              : false,
  Insertion         : false,
  ObjectRange       : false,
  PeriodicalExecuter: false,
  Position          : false,
  Prototype         : false,
  Selector          : false,
  Template          : false,
  Toggle            : false,
  Try               : false,
  Autocompleter     : false,
  Builder           : false,
  Control           : false,
  Draggable         : false,
  Draggables        : false,
  Droppables        : false,
  Effect            : false,
  Sortable          : false,
  SortableObserver  : false,
  Sound             : false,
  Scriptaculous     : false
};

exports.yui = {
  YUI       : false,
  Y         : false,
  YUI_config: false
};

exports.mocha = {
  // Global (for config etc.)
  mocha       : false,
  // BDD
  describe    : false,
  xdescribe   : false,
  context     : false,
  xcontext    : false,
  it          : false,
  xit         : false,
  specify     : false,
  xspecify    : false,
  before      : false,
  after       : false,
  beforeEach  : false,
  afterEach   : false,
  // TDD
  suite         : false,
  test          : false,
  setup         : false,
  teardown      : false,
  suiteSetup    : false,
  suiteTeardown : false
};

exports.jasmine = {
  jasmine     : false,
  describe    : false,
  xdescribe   : false,
  it          : false,
  xit         : false,
  beforeEach  : false,
  afterEach   : false,
  setFixtures : false,
  loadFixtures: false,
  spyOn       : false,
  expect      : false,
  // Jasmine 1.3
  runs        : false,
  waitsFor    : false,
  waits       : false,
  // Jasmine 2.1
  beforeAll   : false,
  afterAll    : false,
  fail        : false,
  fdescribe   : false,
  fit         : false,
  pending     : false,
  // Jasmine 2.6
  spyOnProperty: false
};

},{}],"jshint":[function(require,module,exports){
/*!
 * JSHint, by JSHint Community.
 *
 * Licensed under the MIT license.
 *
 * JSHint is a derivative work of JSLint:
 *
 *   Copyright (c) 2002 Douglas Crockford  (www.JSLint.com)
 *
 *   Permission is hereby granted, free of charge, to any person obtaining
 *   a copy of this software and associated documentation files (the "Software"),
 *   to deal in the Software without restriction, including without limitation
 *   the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *   and/or sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following conditions:
 *
 *   The above copyright notice and this permission notice shall be included
 *   in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *   DEALINGS IN THE SOFTWARE.
 *
 */

/*jshint quotmark:double */
/*exported console */

var _            = require("lodash");
var events       = require("events");
var vars         = require("./vars.js");
var messages     = require("./messages.js");
var Lexer        = require("./lex.js").Lexer;
var reg          = require("./reg.js");
var state        = require("./state.js").state;
var style        = require("./style.js");
var options      = require("./options.js");
var scopeManager = require("./scope-manager.js");
var prodParams   = require("./prod-params.js");

// We need this module here because environments such as IE and Rhino
// don't necessarilly expose the 'console' API and browserify uses
// it to log things. It's a sad state of affair, really.
var console = require("console-browserify");

// We build the application inside a function so that we produce only a singleton
// variable. That function will be invoked immediately, and its return value is
// the JSHINT function itself.

var JSHINT = (function() {
  "use strict";

  var api, // Extension API

    // These are operators that should not be used with the ! operator.
    bang = {
      "<"  : true,
      "<=" : true,
      "==" : true,
      "===": true,
      "!==": true,
      "!=" : true,
      ">"  : true,
      ">=" : true,
      "+"  : true,
      "-"  : true,
      "*"  : true,
      "/"  : true,
      "%"  : true
    },

    declared, // Globals that were declared using /*global ... */ syntax.

    functions, // All of the functions

    inblock,
    indent,
    lookahead,
    lex,
    member,
    membersOnly,
    predefined,    // Global variables defined by option

    extraModules = [],
    emitter = new events.EventEmitter();

  function checkOption(name, isStable, t) {
    var type, validNames;

    if (isStable) {
      type = "";
      validNames = options.validNames;
    } else {
      type = "unstable ";
      validNames = options.unstableNames;
    }

    name = name.trim();

    if (/^[+-]W\d{3}$/g.test(name)) {
      return true;
    }

    if (validNames.indexOf(name) === -1) {
      if (t.type !== "jslint" && !_.has(options.removed, name)) {
        error("E001", t, type, name);
        return false;
      }
    }

    return true;
  }

  function isString(obj) {
    return Object.prototype.toString.call(obj) === "[object String]";
  }

  function isIdentifier(tkn, value) {
    if (!tkn)
      return false;

    if (!tkn.identifier || tkn.value !== value)
      return false;

    return true;
  }

  /**
   * ES3 defined a set of "FutureReservedWords" in order "to allow for the
   * possibility of future adoption of [proposed] extensions."
   *
   * ES5 reduced the set of FutureReservedWords, in some cases by using them to
   * define new syntactic forms (e.g. `class` and `const`) and in other cases
   * by simply allowing their use as Identifiers (e.g. `int` and `goto`).
   * Separately, ES5 introduced new restrictions on certain tokens, but limited
   * the restriction to strict mode code (e.g. `let` and `yield`).
   *
   * This function determines if a given token describes a reserved word
   * according to the current state of the parser.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   * @param {Token} token
   */
  function isReserved(context, token) {
    if (!token.reserved) {
      return false;
    }
    var meta = token.meta;

    if (meta && meta.isFutureReservedWord) {
      if (state.inES5()) {
        // ES3 FutureReservedWord in an ES5 environment.
        if (!meta.es5) {
          return false;
        }

        if (token.isProperty) {
          return false;
        }
      }
    } else if (meta && meta.es5 && !state.inES5()) {
      return false;
    }

    // Some identifiers are reserved only within a strict mode environment.
    if (meta && meta.strictOnly && state.inES5()) {
      if (!state.option.strict && !state.isStrict()) {
        return false;
      }
    }

    if (token.id === "await" && (!(context & prodParams.async) && !state.option.module)) {
      return false;
    }

    if (token.id === "yield" && (!(context & prodParams.yield))) {
      return state.isStrict();
    }

    return true;
  }

  function supplant(str, data) {
    return str.replace(/\{([^{}]*)\}/g, function(a, b) {
      var r = data[b];
      return typeof r === "string" || typeof r === "number" ? r : a;
    });
  }

  function combine(dest, src) {
    Object.keys(src).forEach(function(name) {
      if (_.has(JSHINT.blacklist, name)) return;
      dest[name] = src[name];
    });
  }

  function processenforceall() {
    if (state.option.enforceall) {
      for (var enforceopt in options.bool.enforcing) {
        if (state.option[enforceopt] === undefined &&
            !options.noenforceall[enforceopt]) {
          state.option[enforceopt] = true;
        }
      }
      for (var relaxopt in options.bool.relaxing) {
        if (state.option[relaxopt] === undefined) {
          state.option[relaxopt] = false;
        }
      }
    }
  }

  /**
   * Apply all linting options according to the status of the `state` object.
   */
  function applyOptions() {
    var badESOpt = null;
    processenforceall();

    /**
     * TODO: Remove in JSHint 3
     */
    badESOpt = state.inferEsVersion();
    if (badESOpt) {
      quit("E059", state.tokens.next, "esversion", badESOpt);
    }

    if (state.inES5()) {
      combine(predefined, vars.ecmaIdentifiers[5]);
    }

    if (state.inES6()) {
      combine(predefined, vars.ecmaIdentifiers[6]);
    }

    if (state.inES8()) {
      combine(predefined, vars.ecmaIdentifiers[8]);
    }

    if (state.inES11()) {
      combine(predefined, vars.ecmaIdentifiers[11]);
    }

    /**
     * Use `in` to check for the presence of any explicitly-specified value for
     * `globalstrict` because both `true` and `false` should trigger an error.
     */
    if (state.option.strict === "global" && "globalstrict" in state.option) {
      quit("E059", state.tokens.next, "strict", "globalstrict");
    }

    if (state.option.module) {
      /**
       * TODO: Extend this restriction to *all* ES6-specific options.
       */
      if (!state.inES6()) {
        warning("W134", state.tokens.next, "module", 6);
      }
    }

    if (state.option.regexpu) {
      /**
       * TODO: Extend this restriction to *all* ES6-specific options.
       */
      if (!state.inES6()) {
        warning("W134", state.tokens.next, "regexpu", 6);
      }
    }

    if (state.option.couch) {
      combine(predefined, vars.couch);
    }

    if (state.option.qunit) {
      combine(predefined, vars.qunit);
    }

    if (state.option.rhino) {
      combine(predefined, vars.rhino);
    }

    if (state.option.shelljs) {
      combine(predefined, vars.shelljs);
      combine(predefined, vars.node);
    }
    if (state.option.typed) {
      combine(predefined, vars.typed);
    }

    if (state.option.phantom) {
      combine(predefined, vars.phantom);
    }

    if (state.option.prototypejs) {
      combine(predefined, vars.prototypejs);
    }

    if (state.option.node) {
      combine(predefined, vars.node);
      combine(predefined, vars.typed);
    }

    if (state.option.devel) {
      combine(predefined, vars.devel);
    }

    if (state.option.dojo) {
      combine(predefined, vars.dojo);
    }

    if (state.option.browser) {
      combine(predefined, vars.browser);
      combine(predefined, vars.typed);
    }

    if (state.option.browserify) {
      combine(predefined, vars.browser);
      combine(predefined, vars.typed);
      combine(predefined, vars.browserify);
    }

    if (state.option.nonstandard) {
      combine(predefined, vars.nonstandard);
    }

    if (state.option.jasmine) {
      combine(predefined, vars.jasmine);
    }

    if (state.option.jquery) {
      combine(predefined, vars.jquery);
    }

    if (state.option.mootools) {
      combine(predefined, vars.mootools);
    }

    if (state.option.worker) {
      combine(predefined, vars.worker);
    }

    if (state.option.wsh) {
      combine(predefined, vars.wsh);
    }

    if (state.option.yui) {
      combine(predefined, vars.yui);
    }

    if (state.option.mocha) {
      combine(predefined, vars.mocha);
    }
  }

  // Produce an error warning.
  function quit(code, token, a, b) {
    var percentage = Math.floor((token.line / state.lines.length) * 100);
    var message = messages.errors[code].desc;

    var exception = {
      name: "JSHintError",
      line: token.line,
      character: token.from,
      message: message + " (" + percentage + "% scanned).",
      raw: message,
      code: code,
      a: a,
      b: b
    };

    exception.reason = supplant(message, exception) + " (" + percentage +
      "% scanned).";

    throw exception;
  }

  function removeIgnoredMessages() {
    var ignored = state.ignoredLines;

    if (_.isEmpty(ignored)) return;
    JSHINT.errors = _.reject(JSHINT.errors, function(err) { return ignored[err.line] });
  }

  function warning(code, t, a, b, c, d) {
    var ch, l, w, msg;

    if (/^W\d{3}$/.test(code)) {
      if (state.ignored[code])
        return;

      msg = messages.warnings[code];
    } else if (/E\d{3}/.test(code)) {
      msg = messages.errors[code];
    } else if (/I\d{3}/.test(code)) {
      msg = messages.info[code];
    }

    t = t || state.tokens.next || {};
    if (t.id === "(end)") {  // `~
      t = state.tokens.curr;
    }

    l = t.line;
    ch = t.from;

    w = {
      id: "(error)",
      raw: msg.desc,
      code: msg.code,
      evidence: state.lines[l - 1] || "",
      line: l,
      character: ch,
      scope: JSHINT.scope,
      a: a,
      b: b,
      c: c,
      d: d
    };

    w.reason = supplant(msg.desc, w);
    JSHINT.errors.push(w);

    removeIgnoredMessages();

    var errors = JSHINT.errors.filter(function(e) { return /E\d{3}/.test(e.code); });
    if (errors.length >= state.option.maxerr) {
      quit("E043", t);
    }
    return w;
  }

  function warningAt(m, l, ch, a, b, c, d) {
    return warning(m, {
      line: l,
      from: ch
    }, a, b, c, d);
  }

  function error(m, t, a, b, c, d) {
    warning(m, t, a, b, c, d);
  }

  function errorAt(m, l, ch, a, b, c, d) {
    return error(m, {
      line: l,
      from: ch
    }, a, b, c, d);
  }

  // Tracking of "internal" scripts, like eval containing a static string
  function addEvalCode(elem, token) {
    JSHINT.internals.push({
      id: "(internal)",
      elem: elem,
      token: token,
      code: token.value.replace(/([^\\])(\\*)\2\\n/g, "$1\n")
    });
  }

  /**
   * Process an inline linting directive
   *
   * @param {Token} directiveToken - the directive-bearing comment token
   * @param {Token} previous - the token that preceeds the directive
   */
  function lintingDirective(directiveToken, previous) {
    var body = directiveToken.body.split(",")
      .map(function(s) { return s.trim(); });
    var predef = {};

    if (directiveToken.type === "falls through") {
      previous.caseFallsThrough = true;
      return;
    }

    if (directiveToken.type === "globals") {
      body.forEach(function(item, idx) {
        var parts = item.split(":");
        var key = parts[0].trim();

        if (key === "-" || !key.length) {
          // Ignore trailing comma
          if (idx > 0 && idx === body.length - 1) {
            return;
          }
          error("E002", directiveToken);
          return;
        }

        if (key.charAt(0) === "-") {
          key = key.slice(1);

          JSHINT.blacklist[key] = key;
          delete predefined[key];
        } else {
          predef[key] = parts.length > 1 && parts[1].trim() === "true";
        }
      });

      combine(predefined, predef);

      for (var key in predef) {
        if (_.has(predef, key)) {
          declared[key] = directiveToken;
        }
      }
    }

    if (directiveToken.type === "exported") {
      body.forEach(function(e, idx) {
        if (!e.length) {
          // Ignore trailing comma
          if (idx > 0 && idx === body.length - 1) {
            return;
          }
          error("E002", directiveToken);
          return;
        }

        state.funct["(scope)"].addExported(e);
      });
    }

    if (directiveToken.type === "members") {
      membersOnly = membersOnly || {};

      body.forEach(function(m) {
        var ch1 = m.charAt(0);
        var ch2 = m.charAt(m.length - 1);

        if (ch1 === ch2 && (ch1 === "\"" || ch1 === "'")) {
          m = m
            .substr(1, m.length - 2)
            .replace("\\\"", "\"");
        }

        membersOnly[m] = false;
      });
    }

    var numvals = [
      "maxstatements",
      "maxparams",
      "maxdepth",
      "maxcomplexity",
      "maxerr",
      "maxlen",
      "indent"
    ];

    if (directiveToken.type === "jshint" || directiveToken.type === "jslint" ||
      directiveToken.type === "jshint.unstable") {
      body.forEach(function(item) {
        var parts = item.split(":");
        var key = parts[0].trim();
        var val = parts.length > 1 ? parts[1].trim() : "";
        var numberVal;

        if (!checkOption(key, directiveToken.type !== "jshint.unstable", directiveToken)) {
          return;
        }

        if (numvals.indexOf(key) >= 0) {
          // GH988 - numeric options can be disabled by setting them to `false`
          if (val !== "false") {
            numberVal = +val;

            if (typeof numberVal !== "number" || !isFinite(numberVal) ||
              numberVal <= 0 || Math.floor(numberVal) !== numberVal) {
              error("E032", directiveToken, val);
              return;
            }

            state.option[key] = numberVal;
          } else {
            state.option[key] = key === "indent" ? 4 : false;
          }

          return;
        }

        if (key === "validthis") {
          // `validthis` is valid only within a function scope.

          if (state.funct["(global)"])
            return void error("E009");

          if (val !== "true" && val !== "false")
            return void error("E002", directiveToken);

          state.option.validthis = (val === "true");
          return;
        }

        if (key === "quotmark") {
          switch (val) {
          case "true":
          case "false":
            state.option.quotmark = (val === "true");
            break;
          case "double":
          case "single":
            state.option.quotmark = val;
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "shadow") {
          switch (val) {
          case "true":
            state.option.shadow = true;
            break;
          case "outer":
            state.option.shadow = "outer";
            break;
          case "false":
          case "inner":
            state.option.shadow = "inner";
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "unused") {
          switch (val) {
          case "true":
            state.option.unused = true;
            break;
          case "false":
            state.option.unused = false;
            break;
          case "vars":
          case "strict":
            state.option.unused = val;
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "latedef") {
          switch (val) {
          case "true":
            state.option.latedef = true;
            break;
          case "false":
            state.option.latedef = false;
            break;
          case "nofunc":
            state.option.latedef = "nofunc";
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "ignore") {
          switch (val) {
          case "line":
            state.ignoredLines[directiveToken.line] = true;
            removeIgnoredMessages();
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "strict") {
          switch (val) {
          case "true":
            state.option.strict = true;
            break;
          case "false":
            state.option.strict = false;
            break;
          case "global":
          case "implied":
            state.option.strict = val;
            break;
          default:
            error("E002", directiveToken);
          }
          return;
        }

        if (key === "module") {
          /**
           * TODO: Extend this restriction to *all* "environmental" options.
           */
          if (!hasParsedCode(state.funct)) {
            error("E055", directiveToken, "module");
          }
        }

        if (key === "esversion") {
          switch (val) {
          case "3":
          case "5":
          case "6":
          case "7":
          case "8":
          case "9":
          case "10":
          case "11":
            state.option.moz = false;
            state.option.esversion = +val;
            break;
          case "2015":
          case "2016":
          case "2017":
          case "2018":
          case "2019":
          case "2020":
            state.option.moz = false;
            // Translate specification publication year to version number.
            state.option.esversion = +val - 2009;
            break;
          default:
            error("E002", directiveToken);
          }
          if (!hasParsedCode(state.funct)) {
            error("E055", directiveToken, "esversion");
          }
          return;
        }

        var match = /^([+-])(W\d{3})$/g.exec(key);
        if (match) {
          // ignore for -W..., unignore for +W...
          state.ignored[match[2]] = (match[1] === "-");
          return;
        }

        var tn;
        if (val === "true" || val === "false") {
          if (directiveToken.type === "jslint") {
            tn = options.renamed[key] || key;
            state.option[tn] = (val === "true");

            if (options.inverted[tn] !== undefined) {
              state.option[tn] = !state.option[tn];
            }
          } else if (directiveToken.type === "jshint.unstable") {
            /* istanbul ignore next */
            state.option.unstable[key] = (val === "true");
          } else {
            state.option[key] = (val === "true");
          }

          return;
        }

        error("E002", directiveToken);
      });

      applyOptions();
    }
  }

  /**
   * Return a token beyond the token available in `state.tokens.next`. If no
   * such token exists, return the "(end)" token. This function is used to
   * determine parsing strategies in cases where the value of the next token
   * does not provide sufficient information, as is the case with `for` loops,
   * e.g.:
   *
   *     for ( var i in ...
   *
   * versus:
   *
   *     for ( var i = ...
   *
   * @param {number} [p] - offset of desired token; defaults to 0
   *
   * @returns {token}
   */
  function peek(p) {
    var i = p || 0, j = lookahead.length, t;

    if (i < j) {
      return lookahead[i];
    }

    while (j <= i) {
      t = lex.token();

      // When the lexer is exhausted, this function should produce the "(end)"
      // token, even in cases where the requested token is beyond the end of
      // the input stream.
      if (!t) {
        // If the lookahead buffer is empty, the expected "(end)" token was
        // already emitted by the most recent invocation of `advance` and is
        // available as the next token.
        if (!lookahead.length) {
          return state.tokens.next;
        }

        return lookahead[j - 1];
      }

      lookahead[j] = t;
      j += 1;
    }

    return t;
  }

  function peekIgnoreEOL() {
    var i = 0;
    var t;
    do {
      t = peek(i++);
    } while (t.id === "(endline)");
    return t;
  }

  /**
   * Consume the next token.
   *
   * @param {string} [expected] - the expected value of the next token's `id`
   *                              property (in the case of punctuators) or
   *                              `value` property (in the case of identifiers
   *                              and literals); if unspecified, any token will
   *                              be accepted
   * @param {object} [relatedToken] - the token that informed the expected
   *                                  value, if any (for example: the opening
   *                                  brace when a closing brace is expected);
   *                                  used to produce more meaningful errors
   */
  function advance(expected, relatedToken) {
    var nextToken = state.tokens.next;

    if (expected && nextToken.id !== expected) {
      if (relatedToken) {
        if (nextToken.id === "(end)") {
          error("E019", relatedToken, relatedToken.id);
        } else {
          error("E020", nextToken, expected, relatedToken.id,
            relatedToken.line, nextToken.value);
        }
      } else if (nextToken.type !== "(identifier)" || nextToken.value !== expected) {
        error("E021", nextToken, expected, nextToken.value);
      }
    }

    state.tokens.prev = state.tokens.curr;
    state.tokens.curr = state.tokens.next;
    for (;;) {
      state.tokens.next = lookahead.shift() || lex.token();

      if (!state.tokens.next) { // No more tokens left, give up
        quit("E041", state.tokens.curr);
      }

      if (state.tokens.next.id === "(end)" || state.tokens.next.id === "(error)") {
        return;
      }

      if (state.tokens.next.check) {
        state.tokens.next.check();
      }

      if (state.tokens.next.isSpecial) {
        lintingDirective(state.tokens.next, state.tokens.curr);
      } else {
        if (state.tokens.next.id !== "(endline)") {
          break;
        }
      }
    }
  }

  /**
   * Determine whether a given token is an operator.
   *
   * @param {token} token
   *
   * @returns {boolean}
   */
  function isOperator(token) {
    return token.first || token.right || token.left || token.id === "yield" || token.id === "await";
  }

  function isEndOfExpr(context, curr, next) {
    if (arguments.length <= 1) {
      curr = state.tokens.curr;
      next = state.tokens.next;
    }

    if (next.id === "in" && context & prodParams.noin) {
      return true;
    }

    if (next.id === ";" || next.id === "}" || next.id === ":") {
      return true;
    }

    if (next.infix === curr.infix ||
      // Infix operators which follow `yield` should only be consumed as part
      // of the current expression if allowed by the syntactic grammar. In
      // effect, this prevents automatic semicolon insertion when `yield` is
      // followed by a newline and a comma operator (without enabling it when
      // `yield` is followed by a newline and a `[` token).
      (curr.id === "yield" && curr.rbp < next.rbp)) {
      return !sameLine(curr, next);
    }

    return false;
  }

  /**
   * The `expression` function is the heart of JSHint's parsing behaior. It is
   * based on the Pratt parser, but it extends that model with a `fud` method.
   * Short for "first null denotation," it it similar to the `nud` ("null
   * denotation") function, but it is only used on the first token of a
   * statement. This simplifies usage in statement-oriented languages like
   * JavaScript.
   *
   * .nud  Null denotation
   * .fud  First null denotation
   * .led  Left denotation
   *  lbp  Left binding power
   *  rbp  Right binding power
   *
   * They are elements of the parsing method called Top Down Operator Precedence.
   *
   * In addition to parsing, this function applies a number of linting patterns.
   *
   * @param {number} context - the parsing context (a bitfield describing
   *                           conditions of the current parsing operation
   *                           which can influence how the next tokens are
   *                           interpreted); see `prod-params.js` for more
   *                           detail)
   * @param {number} rbp - the right-binding power of the token to be consumed
   */
  function expression(context, rbp) {
    var left, isArray = false, isObject = false;
    var initial = context & prodParams.initial;
    var curr;

    context &= ~prodParams.initial;

    state.nameStack.push();

    if (state.tokens.next.id === "(end)")
      error("E006", state.tokens.curr);

    advance();

    if (initial) {
      state.funct["(verb)"] = state.tokens.curr.value;
      state.tokens.curr.beginsStmt = true;
    }

    curr = state.tokens.curr;

    if (initial && curr.fud && (!curr.useFud || curr.useFud(context))) {
      left = state.tokens.curr.fud(context);
    } else {
      if (state.tokens.curr.nud) {
        left = state.tokens.curr.nud(context, rbp);
      } else {
        error("E030", state.tokens.curr, state.tokens.curr.id);
      }

      while (rbp < state.tokens.next.lbp && !isEndOfExpr(context)) {
        isArray = state.tokens.curr.value === "Array";
        isObject = state.tokens.curr.value === "Object";

        // #527, new Foo.Array(), Foo.Array(), new Foo.Object(), Foo.Object()
        // Line breaks in IfStatement heads exist to satisfy the checkJSHint
        // "Line too long." error.
        if (left && (left.value || (left.first && left.first.value))) {
          // If the left.value is not "new", or the left.first.value is a "."
          // then safely assume that this is not "new Array()" and possibly
          // not "new Object()"...
          if (left.value !== "new" ||
            (left.first && left.first.value && left.first.value === ".")) {
            isArray = false;
            // ...In the case of Object, if the left.value and state.tokens.curr.value
            // are not equal, then safely assume that this not "new Object()"
            if (left.value !== state.tokens.curr.value) {
              isObject = false;
            }
          }
        }

        advance();

        if (isArray && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
          warning("W009", state.tokens.curr);
        }

        if (isObject && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
          warning("W010", state.tokens.curr);
        }

        if (left && state.tokens.curr.led) {
          left = state.tokens.curr.led(context, left);
        } else {
          error("E033", state.tokens.curr, state.tokens.curr.id);
        }
      }
    }

    state.nameStack.pop();

    return left;
  }


  // Functions for conformance of style.

  function sameLine(first, second) {
    return first.line === (second.startLine || second.line);
  }

  function nobreaknonadjacent(left, right) {
    if (!state.option.laxbreak && !sameLine(left, right)) {
      warning("W014", right, right.value);
    }
  }

  function nolinebreak(t) {
    if (!sameLine(t, state.tokens.next)) {
      warning("E022", t, t.value);
    }
  }

  /**
   * Validate the comma token in the "current" position of the token stream.
   *
   * @param {object} [opts]
   * @param {boolean} [opts.property] - flag indicating whether the current
   *                                    comma token is situated directly within
   *                                    an object initializer
   * @param {boolean} [opts.allowTrailing] - flag indicating whether the
   *                                         current comma token may appear
   *                                         directly before a delimiter
   *
   * @returns {boolean} flag indicating the validity of the current comma
   *                    token; `false` if the token directly causes a syntax
   *                    error, `true` otherwise
   */
  function checkComma(opts) {
    var prev = state.tokens.prev;
    var curr = state.tokens.curr;
    opts = opts || {};

    if (!sameLine(prev, curr)) {
      if (!state.option.laxcomma) {
        if (checkComma.first) {
          warning("I001", curr);
          checkComma.first = false;
        }
        warning("W014", prev, curr.value);
      }
    }

    if (state.tokens.next.identifier && !(opts.property && state.inES5())) {
      // Keywords that cannot follow a comma operator.
      switch (state.tokens.next.value) {
      case "break":
      case "case":
      case "catch":
      case "continue":
      case "default":
      case "do":
      case "else":
      case "finally":
      case "for":
      case "if":
      case "in":
      case "instanceof":
      case "return":
      case "switch":
      case "throw":
      case "try":
      case "var":
      case "let":
      case "while":
      case "with":
        error("E024", state.tokens.next, state.tokens.next.value);
        return false;
      }
    }

    if (state.tokens.next.type === "(punctuator)") {
      switch (state.tokens.next.value) {
      case "}":
      case "]":
      case ",":
      case ")":
        if (opts.allowTrailing) {
          return true;
        }

        error("E024", state.tokens.next, state.tokens.next.value);
        return false;
      }
    }
    return true;
  }

  /**
   * Factory function for creating "symbols"--objects that will be inherited by
   * tokens. The objects created by this function are stored in a symbol table
   * and set as the prototype of the tokens generated by the lexer.
   *
   * Note that this definition of "symbol" describes an implementation detail
   * of JSHint and is not related to the ECMAScript value type introduced in
   * ES2015.
   *
   * @param {string} s - the name of the token; for keywords (e.g. `void`) and
   *                     delimiters (e.g.. `[`), this is the token's text
   *                     representation; for literals (e.g. numbers) and other
   *                     "special" tokens (e.g. the end-of-file marker) this is
   *                     a parenthetical value
   * @param {number} p - the left-binding power of the token as used by the
   *                     Pratt parsing semantics
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function symbol(s, p) {
    var x = state.syntax[s];
    if (!x || typeof x !== "object") {
      state.syntax[s] = x = {
        id: s,
        lbp: p,
        // Symbols that accept a right-hand side do so with a binding power
        // that is commonly identical to their left-binding power. (This value
        // is relevant when determining if the grouping operator is necessary
        // to override the precedence of surrounding operators.) Because the
        // exponentiation operator's left-binding power and right-binding power
        // are distinct, the values must be encoded separately.
        rbp: p,
        value: s
      };
    }
    return x;
  }

  /**
   * Convenience function for defining delimiter symbols.
   *
   * @param {string} s - the name of the symbol
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function delim(s) {
    var x = symbol(s, 0);
    x.delim = true;
    return x;
  }

  /**
   * Convenience function for defining statement-denoting symbols.
   *
   * @param {string} s - the name of the symbol
   * @param {function} f - the first null denotation function for the symbol;
   *                       see the `expression` function for more detail
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function stmt(s, f) {
    var x = delim(s);
    x.identifier = x.reserved = true;
    x.fud = f;
    return x;
  }

  /**
   * Convenience function for defining block-statement-denoting symbols.
   *
   * A block-statement-denoting symbol is one like 'if' or 'for', which will be
   * followed by a block and will not have to end with a semicolon.
   *
   * @param {string} s - the name of the symbol
   * @param {function} - the first null denotation function for the symbol; see
   *                     the `expression` function for more detail
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function blockstmt(s, f) {
    var x = stmt(s, f);
    x.block = true;
    return x;
  }
  /**
   * Denote a given JSHint symbol as an identifier and a reserved keyword.
   *
   * @param {object} - a JSHint symbol value
   *
   * @returns {object} - the provided object
   */
  function reserveName(x) {
    var c = x.id.charAt(0);
    if ((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")) {
      x.identifier = x.reserved = true;
    }
    return x;
  }

  /**
   * Convenience function for defining "prefix" symbols--operators that accept
   * expressions as a right-hand side.
   *
   * @param {string} s - the name of the symbol
   * @param {function} [f] - the first null denotation function for the symbol;
   *                         see the `expression` function for more detail
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function prefix(s, f) {
    var x = symbol(s, 150);
    reserveName(x);

    x.nud = (typeof f === "function") ? f : function(context) {
      this.arity = "unary";
      this.right = expression(context, 150);

      if (this.id === "++" || this.id === "--") {
        if (state.option.plusplus) {
          warning("W016", this, this.id);
        }

        if (this.right) {
          checkLeftSideAssign(context, this.right, this);
        }
      }

      return this;
    };

    return x;
  }

  /**
   * Convenience function for defining "type" symbols--those that describe
   * literal values.
   *
   * @param {string} s - the name of the symbol
   * @param {function} f - the first null denotation function for the symbol;
   *                       see the `expression` function for more detail
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function type(s, f) {
    var x = symbol(s, 0);
    x.type = s;
    x.nud = f;
    return x;
  }

  /**
   * Convenience function for defining JSHint symbols for reserved
   * keywords--those that are restricted from use as bindings (and as property
   * names in ECMAScript 3 environments).
   *
   * @param {string} s - the name of the symbol
   * @param {function} func - the first null denotation function for the
   *                          symbol; see the `expression` function for more
   *                          detail
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function reserve(name, func) {
    var x = type(name, func);
    x.identifier = true;
    x.reserved = true;
    return x;
  }

  /**
   * Convenience function for defining JSHint symbols for keywords that are
   * only reserved in some circumstances.
   *
   * @param {string} name - the name of the symbol
   * @param {object} [meta] - a collection of optional arguments
   * @param {function} [meta.nud] -the null denotation function for the symbol;
   *                   see the `expression` function for more detail
   * @param {boolean} [meta.es5] - `true` if the identifier is reserved
   *                               in ECMAScript 5 or later
   * @param {boolean} [meta.strictOnly] - `true` if the identifier is only
   *                                      reserved in strict mode code.
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function FutureReservedWord(name, meta) {
    var x = type(name, state.syntax["(identifier)"].nud);

    meta = meta || {};
    meta.isFutureReservedWord = true;

    x.value = name;
    x.identifier = true;
    x.reserved = true;
    x.meta = meta;

    return x;
  }

  /**
   * Convenience function for defining "infix" symbols--operators that require
   * operands as both "land-hand side" and "right-hand side".
   *
   * @param {string} s - the name of the symbol
   * @param {function} [f] - a function to be invoked that consumes the
   *                         right-hand side of the operator
   * @param {number} p - the left-binding power of the token as used by the
   *                     Pratt parsing semantics
   * @param {boolean} [w] - if `true`
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function infix(s, f, p, w) {
    var x = symbol(s, p);
    reserveName(x);
    x.infix = true;
    x.led = function(context, left) {
      if (!w) {
        nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
      }
      if ((s === "in" || s === "instanceof") && left.id === "!") {
        warning("W018", left, "!");
      }
      if (typeof f === "function") {
        return f(context, left, this);
      } else {
        this.left = left;
        this.right = expression(context, p);
        return this;
      }
    };
    return x;
  }

  /**
   * Convenience function for defining the `=>` token as used in arrow
   * functions.
   *
   * @param {string} s - the name of the symbol
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function application(s) {
    var x = symbol(s, 42);

    x.infix = true;
    x.led = function(context, left) {
      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);

      this.left = left;
      this.right = doFunction(context, { type: "arrow", loneArg: left });
      return this;
    };
    return x;
  }

  /**
   * Convenience function for defining JSHint symbols for relation operators.
   *
   * @param {string} s - the name of the symbol
   * @param {function} [f] - a function to be invoked to enforce any additional
   *                         linting rules.
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function relation(s, f) {
    var x = symbol(s, 100);

    x.infix = true;
    x.led = function(context, left) {
      nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
      this.left = left;
      var right = this.right = expression(context, 100);

      if (isIdentifier(left, "NaN") || isIdentifier(right, "NaN")) {
        warning("W019", this);
      } else if (f) {
        f.apply(this, [context, left, right]);
      }

      if (!left || !right) {
        quit("E041", state.tokens.curr);
      }

      if (left.id === "!") {
        warning("W018", left, "!");
      }

      if (right.id === "!") {
        warning("W018", right, "!");
      }

      return this;
    };
    return x;
  }

  /**
   * Determine if a given token marks the beginning of a UnaryExpression.
   *
   * @param {object} token
   *
   * @returns {boolean}
   */
  function beginsUnaryExpression(token) {
    return token.arity === "unary" && token.id !== "++" && token.id !== "--";
  }

  var typeofValues = {};
  typeofValues.legacy = [
    // E4X extended the `typeof` operator to return "xml" for the XML and
    // XMLList types it introduced.
    // Ref: 11.3.2 The typeof Operator
    // http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-357.pdf
    "xml",
    // IE<9 reports "unknown" when the `typeof` operator is applied to an
    // object existing across a COM+ bridge. In lieu of official documentation
    // (which does not exist), see:
    // http://robertnyman.com/2005/12/21/what-is-typeof-unknown/
    "unknown"
  ];
  typeofValues.es3 = [
    "undefined", "boolean", "number", "string", "function", "object",
  ];
  typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
  typeofValues.es6 = typeofValues.es3.concat("symbol", "bigint");

  /**
   * Validate comparisons between the result of a `typeof` expression and a
   * string literal.
   *
   * @param {token} [left] - one of the values being compared
   * @param {token} [right] - the other value being compared
   * @param {object} state - the global state object (see `state.js`)
   *
   * @returns {boolean} - `false` if the second token describes a `typeof`
   *                       expression and the first token is a string literal
   *                       whose value is never returned by that operator;
   *                       `true` otherwise
   */
  function isTypoTypeof(left, right, state) {
    var values;

    if (state.option.notypeof)
      return false;

    if (!left || !right)
      return false;

    values = state.inES6() ? typeofValues.es6 : typeofValues.es3;

    if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)") {
      if (left.value === "bigint") {
        if (!state.inES11()) {
          warning("W119", left, "BigInt", "11");
        }

        return false;
      }

      return !_.includes(values, left.value);
    }

    return false;
  }

  /**
   * Determine if a given token describes the built-in `eval` function.
   *
   * @param {token} left
   * @param {object} state - the global state object (see `state.js`)
   *
   * @returns {boolean}
   */
  function isGlobalEval(left, state) {
    var isGlobal = false;

    // permit methods to refer to an "eval" key in their own context
    if (left.type === "this" && state.funct["(context)"] === null) {
      isGlobal = true;
    }
    // permit use of "eval" members of objects
    else if (left.type === "(identifier)") {
      if (state.option.node && left.value === "global") {
        isGlobal = true;
      }

      else if (state.option.browser && (left.value === "window" || left.value === "document")) {
        isGlobal = true;
      }
    }

    return isGlobal;
  }

  /**
   * Determine if a given token describes a property of a built-in object.
   *
   * @param {token} left
   *
   * @returns {boolean}
   */
  function findNativePrototype(left) {
    var natives = [
      "Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
      "DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
      "Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
      "Iterator", "Number", "NumberFormat", "Object", "RangeError",
      "ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
      "TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
      "URIError"
    ];

    function walkPrototype(obj) {
      if (typeof obj !== "object") return;
      return obj.right === "prototype" ? obj : walkPrototype(obj.left);
    }

    function walkNative(obj) {
      while (!obj.identifier && typeof obj.left === "object")
        obj = obj.left;

      if (obj.identifier && natives.indexOf(obj.value) >= 0 &&
          state.funct["(scope)"].isPredefined(obj.value)) {
        return obj.value;
      }
    }

    var prototype = walkPrototype(left);
    if (prototype) return walkNative(prototype);
  }

  /**
   * Determine if the given token is a valid assignment target; emit errors
   * and/or warnings as appropriate
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   * @param {token} left - the left hand side of the assignment
   * @param {token=} assignToken - the token for the assignment, used for
   *                               reporting
   * @param {object=} options - optional object
   * @param {boolean} options.allowDestructuring - whether to allow
   *                                               destructuring binding
   *
   * @returns {boolean} Whether the left hand side is OK
   */
  function checkLeftSideAssign(context, left, assignToken, options) {

    var allowDestructuring = options && options.allowDestructuring;

    assignToken = assignToken || left;

    if (state.option.freeze) {
      var nativeObject = findNativePrototype(left);
      if (nativeObject)
        warning("W121", left, nativeObject);
    }

    if (left.identifier && !left.isMetaProperty) {
      // The `reassign` method also calls `modify`, but we are specific in
      // order to catch function re-assignment and globals re-assignment
      state.funct["(scope)"].block.reassign(left.value, left);
    }

    if (left.id === ".") {
      if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
        warning("W143", assignToken);
      }

      state.nameStack.set(state.tokens.prev);
      return true;
    } else if (left.id === "{" || left.id === "[") {
      if (!allowDestructuring || !left.destructAssign) {
        if (left.id === "{" || !left.left) {
          warning("E031", assignToken);
        } else if (left.left.value === "arguments" && !state.isStrict()) {
          warning("W143", assignToken);
        }
      }

      if (left.id === "[") {
        state.nameStack.set(left.right);
      }

      return true;
    } else if (left.identifier && !isReserved(context, left) && !left.isMetaProperty) {
      if (state.funct["(scope)"].bindingtype(left.value) === "exception") {
        warning("W022", left);
      }

      if (left.value === "eval" && state.isStrict()) {
        error("E031", assignToken);
        return false;
      } else if (left.value === "arguments") {
        if (!state.isStrict()) {
          warning("W143", assignToken);
        } else {
          error("E031", assignToken);
          return false;
        }
      }
      state.nameStack.set(left);
      return true;
    }

    error("E031", assignToken);

    return false;
  }

  /**
   * Convenience function for defining JSHint symbols for assignment operators.
   *
   * @param {string} s - the name of the symbol
   * @param {function} [f] - a function to be invoked that consumes the
   *                         right-hand side of the operator (see the `infix`
   *                         function)
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function assignop(s, f) {
    var x = infix(s, typeof f === "function" ? f : function(context, left, that) {
      that.left = left;

      checkLeftSideAssign(context, left, that, { allowDestructuring: true });

      that.right = expression(context, 10);

      return that;
    }, 20);

    x.exps = true;
    x.assign = true;

    return x;
  }

  /**
   * Convenience function for defining JSHint symbols for bitwise operators.
   *
   * @param {string} s - the name of the symbol
   * @param {function} [f] - the left denotation function for the symbol; see
   *                         the `expression` function for more detail
   * @param {number} p - the left-binding power of the token as used by the
   *                     Pratt parsing semantics
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function bitwise(s, f, p) {
    var x = symbol(s, p);
    reserveName(x);
    x.infix = true;
    x.led = (typeof f === "function") ? f : function(context, left) {
      if (state.option.bitwise) {
        warning("W016", this, this.id);
      }
      this.left = left;
      this.right = expression(context, p);
      return this;
    };
    return x;
  }

  /**
   * Convenience function for defining JSHint symbols for bitwise assignment
   * operators. See the `assignop` function for more detail.
   *
   * @param {string} s - the name of the symbol
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function bitwiseassignop(s) {
    symbol(s, 20).exps = true;
    return infix(s, function(context, left, that) {
      if (state.option.bitwise) {
        warning("W016", that, that.id);
      }

      checkLeftSideAssign(context, left, that);

      that.right = expression(context, 10);

      return that;
    }, 20);
  }

  /**
   * Convenience function for defining JSHint symbols for those operators which
   * have a single operand that appears before them in the source code.
   *
   * @param {string} s - the name of the symbol
   *
   * @returns {object} - the object describing the JSHint symbol (provided to
   *                     support cases where further refinement is necessary)
   */
  function suffix(s) {
    var x = symbol(s, 150);

    x.led = function(context, left) {
      // this = suffix e.g. "++" punctuator
      // left = symbol operated e.g. "a" identifier or "a.b" punctuator
      if (state.option.plusplus) {
        warning("W016", this, this.id);
      }

      checkLeftSideAssign(context, left, this);

      this.left = left;
      return this;
    };
    return x;
  }

  /**
   * Retrieve the value of the next token if it is an identifier and optionally
   * advance the parser.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   * @param {boolean} [isName] - `true` if an IdentifierName should be consumed
   *                             (e.g. object properties)
   * @param {boolean} [preserve] - `true` if the token should not be consumed
   *
   * @returns {string|undefined} - the value of the identifier, if present
   */
  function optionalidentifier(context, isName, preserve) {
    if (!state.tokens.next.identifier) {
      return;
    }

    if (!preserve) {
      advance();
    }

    var curr = state.tokens.curr;

    if (isReserved(context, curr) && !(isName && state.inES5())) {
      warning("W024", state.tokens.curr, state.tokens.curr.id);
    }

    return curr.value;
  }

  /**
   * Consume the "..." token which designates "spread" and "rest" operations if
   * it is present. If the operator is repeated, consume every repetition, and
   * issue a single error describing the syntax error.
   *
   * @param {string} operation - either "spread" or "rest"
   *
   * @returns {boolean} a value describing whether or not any tokens were
   *                    consumed in this way
   */
  function spreadrest(operation) {
    if (!checkPunctuator(state.tokens.next, "...")) {
      return false;
    }

    if (!state.inES6(true)) {
      warning("W119", state.tokens.next, operation + " operator", "6");
    }
    advance();

    if (checkPunctuator(state.tokens.next, "...")) {
      warning("E024", state.tokens.next, "...");
      while (checkPunctuator(state.tokens.next, "...")) {
        advance();
      }
    }

    return true;
  }

  /**
   * Ensure that the current token is an identifier and retrieve its value.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   * @param {boolean} [isName] - `true` if an IdentifierName should be consumed
   *                             (e.g. object properties)
   *
   * @returns {string|undefined} - the value of the identifier, if present
   */
  function identifier(context, isName) {
    var i = optionalidentifier(context, isName, false);
    if (i) {
      return i;
    }

    error("E030", state.tokens.next, state.tokens.next.value);

    // The token should be consumed after a warning is issued so the parser
    // can continue as though an identifier were found. The semicolon token
    // should not be consumed in this way so that the parser interprets it as
    // a statement delimiter;
    if (state.tokens.next.id !== ";") {
      advance();
    }
  }


  /**
   * Determine if the provided token may be evaluated and emit a linting
   * warning if this is note the case.
   *
   * @param {token} controlToken
   */
  function reachable(controlToken) {
    var i = 0, t;
    if (state.tokens.next.id !== ";" || controlToken.inBracelessBlock) {
      return;
    }
    for (;;) {
      do {
        t = peek(i);
        i += 1;
      } while (t.id !== "(end)" && t.id === "(comment)");

      if (t.reach) {
        return;
      }
      if (t.id !== "(endline)") {
        if (t.id === "function") {
          if (state.option.latedef === true) {
            warning("W026", t);
          }
          break;
        }

        warning("W027", t, t.value, controlToken.value);
        break;
      }
    }
  }

  /**
   * Consume the semicolon that delimits the statement currently being parsed,
   * emitting relevant warnings/errors as appropriate.
   *
   * @param {token} stmt - token describing the statement under consideration
   */
  function parseFinalSemicolon(stmt) {
    if (state.tokens.next.id !== ";") {
      // don't complain about unclosed templates / strings
      if (state.tokens.next.isUnclosed) return advance();

      var isSameLine = sameLine(state.tokens.curr, state.tokens.next) &&
                       state.tokens.next.id !== "(end)";
      var blockEnd = checkPunctuator(state.tokens.next, "}");

      if (isSameLine && !blockEnd && !(stmt.id === "do" && state.inES6(true))) {
        errorAt("E058", state.tokens.curr.line, state.tokens.curr.character);
      } else if (!state.option.asi) {

        // If this is the last statement in a block that ends on the same line
        // *and* option lastsemic is on, ignore the warning.  Otherwise, issue
        // a warning about missing semicolon.
        if (!(blockEnd && isSameLine && state.option.lastsemic)) {
          warningAt("W033", state.tokens.curr.line, state.tokens.curr.character);
        }
      }
    } else {
      advance(";");
    }
  }

  /**
   * Consume a statement.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   *
   * @returns {token} - the token describing the statement
   */
  function statement(context) {
    var i = indent, r, t = state.tokens.next, hasOwnScope = false;

    context |= prodParams.initial;

    if (t.id === ";") {
      advance(";");
      return;
    }

    // Is this a labelled statement?
    var res = isReserved(context, t);

    // We're being more tolerant here: if someone uses
    // a FutureReservedWord (that is not meant to start a statement)
    // as a label, we warn but proceed anyway.

    if (res && t.meta && t.meta.isFutureReservedWord && !t.fud) {
      warning("W024", t, t.id);
      res = false;
    }

    if (t.identifier && !res && peek().id === ":") {
      advance();
      advance(":");

      hasOwnScope = true;
      state.funct["(scope)"].stack();
      state.funct["(scope)"].block.addLabel(t.value, { token: state.tokens.curr });

      if (!state.tokens.next.labelled && state.tokens.next.value !== "{") {
        warning("W028", state.tokens.next, t.value, state.tokens.next.value);
      }

      t = state.tokens.next;
    }

    // Is it a lonely block?

    if (t.id === "{") {
      // Is it a switch case block?
      //
      //  switch (foo) {
      //    case bar: { <= here.
      //      ...
      //    }
      //  }
      var iscase = (state.funct["(verb)"] === "case" && state.tokens.curr.value === ":");
      block(context, true, true, false, false, iscase);

      if (hasOwnScope) {
        state.funct["(scope)"].unstack();
      }

      return;
    }

    // Parse the statement.

    r = expression(context, 0);

    if (r && !(r.identifier && r.value === "function") &&
        !(r.type === "(punctuator)" && r.left &&
          r.left.identifier && r.left.value === "function")) {
      if (!state.isStrict() && state.stmtMissingStrict()) {
        warning("E007");
      }
    }

    // Look for the final semicolon.

    if (!t.block) {
      if (!state.option.expr && (!r || !r.exps)) {
        warning("W030", state.tokens.curr);
      } else if (state.option.nonew && r && r.left && r.id === "(" && r.left.id === "new") {
        warning("W031", t);
      }

      parseFinalSemicolon(t);
    }


    // Restore the indentation.

    indent = i;
    if (hasOwnScope) {
      state.funct["(scope)"].unstack();
    }
    return r;
  }

  /**
   * Consume a series of statements until encountering either the end of the
   * program or a token that interrupts control flow.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   *
   * @returns {Array<token>} - the tokens consumed
   */
  function statements(context) {
    var a = [], p;

    while (!state.tokens.next.reach && state.tokens.next.id !== "(end)") {
      if (state.tokens.next.id === ";") {
        p = peek();

        if (!p || (p.id !== "(" && p.id !== "[")) {
          warning("W032");
        }

        advance(";");
      } else {
        a.push(statement(context));
      }
    }
    return a;
  }


  /**
   * Parse any directives in a directive prologue.
   */
  function directives() {
    var current = state.tokens.next;
    while (state.tokens.next.id === "(string)") {
      var next = peekIgnoreEOL();
      if (!isEndOfExpr(0, current, next)) {
        break;
      }
      current = next;

      advance();
      var directive = state.tokens.curr.value;
      if (state.directive[directive] ||
          (directive === "use strict" && state.option.strict === "implied")) {
        warning("W034", state.tokens.curr, directive);
      }

      // From ECMAScript 2016:
      //
      // > 14.1.2 Static Semantics: Early Errors
      // >
      // > [...]
      // > - It is a Syntax Error if ContainsUseStrict of FunctionBody is true
      // >   and IsSimpleParameterList of FormalParameters is false.
      if (directive === "use strict" && state.inES7() &&
        !state.funct["(global)"] && state.funct["(hasSimpleParams)"] === false) {
        error("E065", state.tokens.curr);
      }

      state.directive[directive] = state.tokens.curr;

      parseFinalSemicolon(current);
    }

    if (state.isStrict()) {
      state.option.undef = true;
    }
  }

  /**
   * Parses a single block. A block is a sequence of statements wrapped in
   * braces.
   *
   * @param {number} context - parsing context
   * @param {boolean} ordinary - `true` for everything but function bodies and
   *                             try blocks
   * @param {boolean} [stmt] - `true` if block can be a single statement (e.g.
   *                           in if/for/while)
   * @param {boolean} [isfunc] - `true` if block is a function body
   * @param {boolean} [isfatarrow] - `true` if its a body of a fat arrow
   *                                 function
   * @param {boolean} [iscase] - `true` if block is a switch case block
   *
   * @returns {token} - the token describing the block
   */
  function block(context, ordinary, stmt, isfunc, isfatarrow, iscase) {
    var a,
      b = inblock,
      old_indent = indent,
      m,
      t,
      d;

    inblock = ordinary;

    t = state.tokens.next;

    var metrics = state.funct["(metrics)"];
    metrics.nestedBlockDepth += 1;
    metrics.verifyMaxNestedBlockDepthPerFunction();

    if (state.tokens.next.id === "{") {
      advance("{");

      // create a new block scope
      state.funct["(scope)"].stack();

      if (state.tokens.next.id !== "}") {
        indent += state.option.indent;
        while (!ordinary && state.tokens.next.from > indent) {
          indent += state.option.indent;
        }

        if (isfunc) {
          m = {};
          for (d in state.directive) {
            m[d] = state.directive[d];
          }
          directives();

          state.funct["(isStrict)"] = state.isStrict();

          if (state.option.strict && state.funct["(context)"]["(global)"]) {
            if (!m["use strict"] && !state.isStrict()) {
              warning("E007");
            }
          }
        }

        a = statements(context);

        metrics.statementCount += a.length;

        indent -= state.option.indent;
      } else if (isfunc) {
        // Ensure property is set for functions with empty bodies.
        state.funct["(isStrict)"] = state.isStrict();
      }

      advance("}", t);

      if (isfunc) {
        state.funct["(scope)"].validateParams(isfatarrow);
        if (m) {
          state.directive = m;
        }
      }

      state.funct["(scope)"].unstack();

      indent = old_indent;
    } else if (!ordinary) {
      if (isfunc) {
        state.funct["(scope)"].stack();

        if (stmt && !isfatarrow && !state.inMoz()) {
          error("W118", state.tokens.curr, "function closure expressions");
        }

        if (isfatarrow) {
          state.funct["(scope)"].validateParams(true);
        }

        var expr = expression(context, 10);

        if (state.option.noreturnawait && context & prodParams.async &&
            expr.identifier && expr.value === "await") {
          warning("W146", expr);
        }

        if (state.option.strict && state.funct["(context)"]["(global)"]) {
          if (!state.isStrict()) {
            warning("E007");
          }
        }

        state.funct["(scope)"].unstack();
      } else {
        error("E021", state.tokens.next, "{", state.tokens.next.value);
      }
    } else {

      state.funct["(scope)"].stack();

      if (!stmt || state.option.curly) {
        warning("W116", state.tokens.next, "{", state.tokens.next.value);
      }

      // JSHint observes Annex B of the ECMAScript specification by default,
      // where function declarations are permitted in the statement positions
      // of IfStatements.
      var supportsFnDecl = state.funct["(verb)"] === "if" ||
        state.tokens.curr.id === "else";

      state.tokens.next.inBracelessBlock = true;
      indent += state.option.indent;
      // test indentation only if statement is in new line
      a = [statement(context)];
      indent -= state.option.indent;

      if (a[0] && a[0].declaration &&
        !(supportsFnDecl && a[0].id === "function")) {
        error("E048", a[0], a[0].id[0].toUpperCase() + a[0].id.slice(1));
      }

      state.funct["(scope)"].unstack();
    }

    // Don't clear and let it propagate out if it is "break", "return" or
    // similar in switch case
    switch (state.funct["(verb)"]) {
    case "break":
    case "continue":
    case "return":
    case "throw":
      if (iscase) {
        break;
      }

      /* falls through */
    default:
      state.funct["(verb)"] = null;
    }

    inblock = b;
    if (ordinary && state.option.noempty && (!a || a.length === 0)) {
      warning("W035", state.tokens.prev);
    }
    metrics.nestedBlockDepth -= 1;
    return a;
  }


  /**
   * Update the global state which tracks all statically-identifiable property
   * names, and emit a warning if the `members` linting directive is in use and
   * does not include the given name.
   *
   * @param {string} m - the property name
   */
  function countMember(m) {
    if (membersOnly && typeof membersOnly[m] !== "boolean") {
      warning("W036", state.tokens.curr, m);
    }
    if (typeof member[m] === "number") {
      member[m] += 1;
    } else {
      member[m] = 1;
    }
  }

  // Build the syntax table by declaring the syntactic elements of the language.

  type("(number)", function() {
    if (state.tokens.next.id === ".") {
      warning("W005", this);
    }

    return this;
  });

  type("(string)", function() {
    return this;
  });

  state.syntax["(identifier)"] = {
    type: "(identifier)",
    lbp: 0,
    identifier: true,

    nud: function(context) {
      var v = this.value;
      // If this identifier is the lone parameter to a shorthand "fat arrow"
      // function definition, i.e.
      //
      //     x => x;
      //
      // ...it should not be considered as a variable in the current scope. It
      // will be added to the scope of the new function when the next token is
      // parsed, so it can be safely ignored for now.
      var isLoneArrowParam = state.tokens.next.id === "=>";

      if (isReserved(context, this)) {
        warning("W024", this, v);
      } else if (!isLoneArrowParam && !state.funct["(comparray)"].check(v)) {
        state.funct["(scope)"].block.use(v, state.tokens.curr);
      }

      return this;
    },

    led: function() {
      /* istanbul ignore next */
      error("E033", state.tokens.next, state.tokens.next.value);
    }
  };

  var baseTemplateSyntax = {
    identifier: false,
    template: true,
  };
  state.syntax["(template)"] = _.extend({
    lbp: 155,
    type: "(template)",
    nud: doTemplateLiteral,
    led: doTemplateLiteral,
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(template middle)"] = _.extend({
    lbp: 0,
    type: "(template middle)",
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(template tail)"] = _.extend({
    lbp: 0,
    type: "(template tail)",
    tail: true,
    noSubst: false
  }, baseTemplateSyntax);

  state.syntax["(no subst template)"] = _.extend({
    lbp: 155,
    type: "(template)",
    nud: doTemplateLiteral,
    led: doTemplateLiteral,
    noSubst: true,
    tail: true // mark as tail, since it's always the last component
  }, baseTemplateSyntax);

  type("(regexp)", function() {
    return this;
  });

  // ECMAScript parser

  delim("(endline)");
  (function(x) {
    x.line = x.from = 0;
  })(delim("(begin)"));
  delim("(end)").reach = true;
  delim("(error)").reach = true;
  delim("}").reach = true;
  delim(")");
  delim("]");
  delim("\"").reach = true;
  delim("'").reach = true;
  delim(";");
  delim(":").reach = true;
  delim("#");

  reserve("else");
  reserve("case").reach = true;
  reserve("catch");
  reserve("default").reach = true;
  reserve("finally");
  reserve("true", function() { return this; });
  reserve("false", function() { return this; });
  reserve("null", function() { return this; });
  reserve("this", function() {
    if (state.isStrict() && !isMethod() &&
        !state.option.validthis && ((state.funct["(statement)"] &&
        state.funct["(name)"].charAt(0) > "Z") || state.funct["(global)"])) {
      warning("W040", this);
    }

    return this;
  });

  (function(superSymbol) {
    superSymbol.rbp = 161;
  })(reserve("super", function() {
    superNud.call(state.tokens.curr, this);

    return this;
  }));

  assignop("=", "assign");
  assignop("+=", "assignadd");
  assignop("-=", "assignsub");
  assignop("*=", "assignmult");
  assignop("/=", "assigndiv").nud = function() {
    /* istanbul ignore next */
    error("E014");
  };
  assignop("%=", "assignmod");
  assignop("**=", function(context, left, that) {
    if (!state.inES7()) {
      warning("W119", that, "Exponentiation operator", "7");
    }

    that.left = left;

    checkLeftSideAssign(context, left, that);

    that.right = expression(context, 10);

    return that;
  });

  bitwiseassignop("&=");
  bitwiseassignop("|=");
  bitwiseassignop("^=");
  bitwiseassignop("<<=");
  bitwiseassignop(">>=");
  bitwiseassignop(">>>=");
  infix(",", function(context, left, that) {
    if (state.option.nocomma) {
      warning("W127", that);
    }

    that.left = left;

    if (checkComma()) {
      that.right = expression(context, 10);
    } else {
      that.right = null;
    }

    return that;
  }, 10, true);

  infix("?", function(context, left, that) {
    increaseComplexityCount();
    that.left = left;
    that.right = expression(context & ~prodParams.noin, 10);
    advance(":");
    expression(context, 10);
    return that;
  }, 30);

  infix("||", function(context, left, that) {
    increaseComplexityCount();
    that.left = left;
    that.right = expression(context, 40);
    return that;
  }, 40);

  var andPrecedence = 50;
  infix("&&", function(context, left, that) {
    increaseComplexityCount();
    that.left = left;
    that.right = expression(context, andPrecedence);
    return that;
  }, andPrecedence);

  infix("??", function(context, left, that) {
    if (!left.paren && (left.id === "||" || left.id === "&&")) {
      error("E024", that, "??");
    }

    if (!state.inES11()) {
      warning("W119", that, "nullish coalescing", "11");
    }

    increaseComplexityCount();
    that.left = left;
    var right = that.right = expression(context, 39);

    if (!right) {
      error("E024", state.tokens.next, state.tokens.next.id);
    } else if (!right.paren && (right.id === "||" || right.id === "&&")) {
      error("E024", that.right, that.right.id);
    }

    return that;
  }, 39);

  // The Exponentiation operator, introduced in ECMAScript 2016
  //
  // ExponentiationExpression[Yield] :
  //   UnaryExpression[?Yield]
  //   UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
  infix("**", function(context, left, that) {
    if (!state.inES7()) {
      warning("W119", that, "Exponentiation operator", "7");
    }

    // Disallow UnaryExpressions which are not wrapped in parenthesis
    if (!left.paren && beginsUnaryExpression(left)) {
      error("E024", that, "**");
    }

    that.left = left;
    that.right = expression(context, that.rbp);
    return that;
  }, 150);
  state.syntax["**"].rbp = 140;
  bitwise("|", "bitor", 70);
  bitwise("^", "bitxor", 80);
  bitwise("&", "bitand", 90);
  relation("==", function(context, left, right) {
    var eqnull = state.option.eqnull &&
      ((left && left.value) === "null" || (right && right.value) === "null");

    switch (true) {
      case !eqnull && state.option.eqeqeq:
        this.from = this.character;
        warning("W116", this, "===", "==");
        break;
      /* istanbul ignore next */
      case isTypoTypeof(right, left, state):
        warning("W122", this, right.value);
        break;
      case isTypoTypeof(left, right, state):
        warning("W122", this, left.value);
        break;
    }

    return this;
  });
  relation("===", function(context, left, right) {
    if (isTypoTypeof(right, left, state)) {
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      /* istanbul ignore next */
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("!=", function(context, left, right) {
    var eqnull = state.option.eqnull &&
        ((left && left.value) === "null" || (right && right.value) === "null");

    if (!eqnull && state.option.eqeqeq) {
      this.from = this.character;
      warning("W116", this, "!==", "!=");
    } else if (isTypoTypeof(right, left, state)) {
      /* istanbul ignore next */
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("!==", function(context, left, right) {
    if (isTypoTypeof(right, left, state)) {
      warning("W122", this, right.value);
    } else if (isTypoTypeof(left, right, state)) {
      /* istanbul ignore next */
      warning("W122", this, left.value);
    }
    return this;
  });
  relation("<");
  relation(">");
  relation("<=");
  relation(">=");
  bitwise("<<", "shiftleft", 120);
  bitwise(">>", "shiftright", 120);
  bitwise(">>>", "shiftrightunsigned", 120);
  infix("in", "in", 120);
  infix("instanceof", function(context, left, token) {
    var right;
    var scope = state.funct["(scope)"];
    token.left = left;
    token.right = right = expression(context, 120);

    // This condition reflects a syntax error which will be reported by the
    // `expression` function.
    if (!right) {
      return token;
    }

    if (right.id === "(number)" ||
        right.id === "(string)" ||
        right.value === "null" ||
        (right.value === "undefined" && !scope.has("undefined")) ||
        right.arity === "unary" ||
        right.id === "{" ||
        (right.id === "[" && !right.right) ||
        right.id === "(regexp)" ||
        (right.id === "(template)" && !right.tag)) {
      error("E060");
    }

    if (right.id === "function") {
      warning("W139");
    }

    return token;
  }, 120);
  infix("+", function(context, left, that) {
    var next = state.tokens.next;
    var right;
    that.left = left;
    that.right = right = expression(context, 130);

    if (left && right && left.id === "(string)" && right.id === "(string)") {
      left.value += right.value;
      left.character = right.character;
      if (!state.option.scripturl && reg.javascriptURL.test(left.value)) {
        warning("W050", left);
      }
      return left;
    }

    if (next.id === "+" || next.id === "++") {
      warning("W007", that.right);
    }

    return that;
  }, 130);
  prefix("+", function(context) {
    var next = state.tokens.next;
    this.arity = "unary";
    this.right = expression(context, 150);

    if (next.id === "+" || next.id === "++") {
      warning("W007", this.right);
    }

    return this;
  });
  infix("-", function(context, left, that) {
    var next = state.tokens.next;
    that.left = left;
    that.right = expression(context, 130);

    if (next.id === "-" || next.id === "--") {
      warning("W006", that.right);
    }

    return that;
  }, 130);
  prefix("-", function(context) {
    var next = state.tokens.next;
    this.arity = "unary";
    this.right = expression(context, 150);

    if (next.id === "-" || next.id === "--") {
      warning("W006", this.right);
    }

    return this;
  });
  infix("*", "mult", 140);
  infix("/", "div", 140);
  infix("%", "mod", 140);

  suffix("++");
  prefix("++", "preinc");
  state.syntax["++"].exps = true;

  suffix("--");
  prefix("--", "predec");
  state.syntax["--"].exps = true;

  prefix("delete", function(context) {
    this.arity = "unary";
    var p = expression(context, 150);
    if (!p) {
      return this;
    }

    if (p.id !== "." && p.id !== "[") {
      warning("W051");
    }
    this.first = p;

    // The `delete` operator accepts unresolvable references when not in strict
    // mode, so the operand may be undefined.
    if (p.identifier && !state.isStrict()) {
      p.forgiveUndef = true;
    }
    return this;
  }).exps = true;

  prefix("~", function(context) {
    if (state.option.bitwise) {
      warning("W016", this, "~");
    }
    this.arity = "unary";
    this.right = expression(context, 150);
    return this;
  });

  infix("...");

  prefix("!", function(context) {
    this.arity = "unary";
    this.right = expression(context, 150);

    if (!this.right) { // '!' followed by nothing? Give up.
      quit("E041", this);
    }

    if (bang[this.right.id] === true) {
      warning("W018", this, "!");
    }
    return this;
  });

  prefix("typeof", function(context) {
    this.arity = "unary";
    var p = expression(context, 150);
    this.first = this.right = p;

    if (!p) { // 'typeof' followed by nothing? Give up.
      quit("E041", this);
    }

    // The `typeof` operator accepts unresolvable references, so the operand
    // may be undefined.
    if (p.identifier) {
      p.forgiveUndef = true;
    }
    return this;
  });
  prefix("new", function(context) {
    var mp = metaProperty(context, "target", function() {
      if (!state.inES6(true)) {
        warning("W119", state.tokens.prev, "new.target", "6");
      }
      var inFunction, c = state.funct;
      while (c) {
        inFunction = !c["(global)"];
        if (!c["(arrow)"]) { break; }
        c = c["(context)"];
      }
      if (!inFunction) {
        warning("W136", state.tokens.prev, "new.target");
      }
    });
    if (mp) { return mp; }

    var opening = state.tokens.next;
    var c = expression(context, 155), i;

    if (!c) {
      return this;
    }

    if (!c.paren && c.rbp > 160) {
      error("E024", opening, opening.value);
    }

    if (c.id !== "function") {
      if (c.identifier) {
        switch (c.value) {
        case "Number":
        case "String":
        case "Boolean":
        case "Math":
        case "JSON":
          warning("W053", state.tokens.prev, c.value);
          break;
        case "Symbol":
          if (state.inES6()) {
            warning("W053", state.tokens.prev, c.value);
          }
          break;
        case "Function":
          if (!state.option.evil) {
            warning("W054");
          }
          break;
        case "Date":
        case "RegExp":
        case "this":
          break;
        default:
          i = c.value.substr(0, 1);
          if (state.option.newcap && (i < "A" || i > "Z") &&
            !state.funct["(scope)"].isPredefined(c.value)) {
            warning("W055", state.tokens.curr);
          }
        }
      } else {
        if (c.id === "?." && !c.paren) {
          error("E024", c, "?.");
        } else if (c.id !== "." && c.id !== "[" && c.id !== "(") {
          /* istanbul ignore next */
          warning("W056", state.tokens.curr);
        }
      }
    } else {
      if (!state.option.supernew)
        warning("W057", this);
    }
    if (state.tokens.next.id !== "(" && !state.option.supernew) {
      warning("W058", state.tokens.curr, state.tokens.curr.value);
    }
    this.first = this.right = c;
    return this;
  });
  state.syntax["new"].exps = true;


  var classDeclaration = blockstmt("class", function(context) {
    var className, classNameToken;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr, "class", "6");
    }
    state.inClassBody = true;

    // Class Declaration: 'class <Classname>'
    if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
      classNameToken = state.tokens.next;
      className = classNameToken.value;
      identifier(context);
      // unintialized, so that the 'extends' clause is parsed while the class is in TDZ
      state.funct["(scope)"].addbinding(className, {
        type: "class",
        initialized: false,
        token: classNameToken
      });
    }

    // Class Declaration: 'class <Classname> extends <Superclass>'
    if (state.tokens.next.value === "extends") {
      advance("extends");
      expression(context, 0);
    }

    if (classNameToken) {
      this.name = classNameToken;
      state.funct["(scope)"].initialize(className);
    } else {
      this.name = null;
    }

    state.funct["(scope)"].stack();
    classBody(this, context);
    return this;
  });
  classDeclaration.exps = true;
  classDeclaration.declaration = true;

  /*
    Class expression

    The Block- and Expression- handling for "class" are almost identical, except for the ordering of steps.
    In an expression:, the name should not be saved into the calling scope, but is still accessible inside the definition, so we open a new scope first, then save the name. We also mark it as used.
  */
  prefix("class", function(context) {
    var className, classNameToken;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr, "class", "6");
    }
    state.inClassBody = true;

    // Class Declaration: 'class <Classname>'
    if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
      classNameToken = state.tokens.next;
      className = classNameToken.value;
      identifier(context);
    }

    // Class Declaration: 'class <Classname> extends <Superclass>'
    if (state.tokens.next.value === "extends") {
      advance("extends");
      expression(context, 0);
    }

    state.funct["(scope)"].stack();
    if (classNameToken) {
      this.name = classNameToken;
      state.funct["(scope)"].addbinding(className, {
        type: "class",
        initialized: true,
        token: classNameToken
      });
      state.funct["(scope)"].block.use(className, classNameToken);
    } else {
      this.name = null;
    }

    classBody(this, context);
    return this;
  });

  function classBody(classToken, context) {
    var props = Object.create(null);
    var name, accessorType, token, isStatic, inGenerator, hasConstructor;

    /* istanbul ignore else */
    if (state.tokens.next.value === "{") {
      advance("{");
    } else {
      warning("W116", state.tokens.curr, "identifier", state.tokens.next.type); //?
      advance();
    }

    while (state.tokens.next.value !== "}") {
      isStatic = false;
      inGenerator = false;
      context &= ~prodParams.preAsync;

      if (state.tokens.next.value === "static" &&
        !checkPunctuator(peek(), "(")) {
        isStatic = true;
        advance();
      }

      if (state.tokens.next.value === "async") {
        if (!checkPunctuator(peek(), "(")) {
          context |= prodParams.preAsync;
          advance();

          nolinebreak(state.tokens.curr);

          if (checkPunctuator(state.tokens.next, "*")) {
            inGenerator = true;
            advance("*");

            if (!state.inES9()) {
              warning("W119", state.tokens.next, "async generators", "9");
            }
          }

          if (!state.inES8()) {
            warning("W119", state.tokens.curr, "async functions", "8");
          }
        }
      }

      if (state.tokens.next.value === "*") {
        inGenerator = true;
        advance();
      }

      token = state.tokens.next;

      if ((token.value === "set" || token.value === "get") && !checkPunctuator(peek(), "(")) {
        if (inGenerator) {
          /* istanbul ignore next */
          error("E024", token, token.value);
        }
        accessorType = token.value;
        advance();
        token = state.tokens.next;

        if (!isStatic && token.value === "constructor") {
          error("E049", token, "class " + accessorType + "ter method", token.value);
        } else if (isStatic && token.value === "prototype") {
          error("E049", token, "static class " + accessorType + "ter method", token.value);
        }
      } else {
        accessorType = null;
      }

      switch (token.value) {
        case ";":
          warning("W032", token);
          advance();
          break;
        case "constructor":
          if (isStatic) {
            // treat like a regular method -- static methods can be called 'constructor'
            name = propertyName(context);
            saveProperty(props, name, token, true, isStatic);
            doMethod(classToken, context, name, inGenerator);
          } else {
            if (inGenerator || context & prodParams.preAsync) {
              error("E024", token, token.value);
            } else if (hasConstructor) {
              /* istanbul ignore next */
              error("E024", token, token.value);
            } else {
              hasConstructor = !accessorType && !isStatic;
            }
            advance();
            doMethod(classToken, context, state.nameStack.infer());
          }
          break;
        case "[":
          name = computedPropertyName(context);
          doMethod(classToken, context, name, inGenerator);
          // We don't check names (via calling saveProperty()) of computed expressions like ["Symbol.iterator"]()
          break;
        default:
          name = propertyName(context);
          if (name === undefined) {
            error("E024", token, token.value);
            advance();
            break;
          }

          if (accessorType) {
            saveAccessor(accessorType, props, name, token, true, isStatic);
            name = state.nameStack.infer();
          } else {
            if (isStatic && name === "prototype") {
              error("E049", token, "static class method", name);
            }

            saveProperty(props, name, token, true, isStatic);
          }

          doMethod(classToken, context, name, inGenerator);
          break;
      }
    }
    advance("}");
    checkProperties(props);

    state.inClassBody = false;
    state.funct["(scope)"].unstack();
  }

  function doMethod(classToken, context, name, generator) {
    if (generator) {
      if (!state.inES6()) {
        warning("W119", state.tokens.curr, "function*", "6");
      }
    }

    if (state.tokens.next.value !== "(") {
      error("E054", state.tokens.next, state.tokens.next.value);
      advance();
      if (state.tokens.next.value === "{") {
        // manually cheating the test "invalidClasses", which asserts this particular behavior when a class is misdefined.
        advance();
        if (state.tokens.next.value === "}") {
          warning("W116", state.tokens.next, "(", state.tokens.next.value);
          advance();
          identifier(context);
          advance();
        }
        /* istanbul ignore next */
        return;
      } else {
        while (state.tokens.next.value !== "(") {
          advance();
        }
      }
    }

    doFunction(context, { name: name,
        type: generator ? "generator" : null,
        isMethod: true,
        statement: classToken });
  }

  prefix("void").exps = true;

  infix(".", function(context, left, that) {
    var m = identifier(context, true);

    if (typeof m === "string") {
      countMember(m);
    }

    that.left = left;
    that.right = m;

    if (m && m === "hasOwnProperty" && state.tokens.next.value === "=") {
      warning("W001");
    }

    if (left && left.value === "arguments" && (m === "callee" || m === "caller")) {
      if (state.option.noarg)
        warning("W059", left, m);
      else if (state.isStrict())
        error("E008");
    } else if (!state.option.evil && left && left.value === "document" &&
        (m === "write" || m === "writeln")) {
      warning("W060", left);
    }

    if (!state.option.evil && (m === "eval" || m === "execScript")) {
      if (isGlobalEval(left, state)) {
        warning("W061");
      }
    }

    return that;
  }, 160, true);

  infix("?.", function(context, left, that) {
    if (!state.inES11()) {
      warning("W119", state.tokens.curr, "Optional chaining", "11");
    }


    if (checkPunctuator(state.tokens.next, "[")) {
      that.left = left;
      advance();
      that.right = state.tokens.curr.led(context, left);
    } else if (checkPunctuator(state.tokens.next, "(")) {
      that.left = left;
      advance();
      that.right = state.tokens.curr.led(context, left);
      that.exps = true;
    } else {
      state.syntax["."].led.call(that, context, left);
    }

    if (state.tokens.next.type === "(template)") {
      error("E024", state.tokens.next, "`");
    }

    return that;
  }, 160, true);


  /**
   * Determine if a CallExpression's "base" is a type of expression commonly
   * used in this position.
   *
   * @param {token} token - token describing the "base" of the CallExpression
   * @returns {boolean}
   */
  function isTypicalCallExpression(token) {
    return token.identifier || token.id === "." || token.id === "[" ||
      token.id === "=>" || token.id === "(" || token.id === "&&" ||
      token.id === "||" || token.id === "?" || token.id === "async" ||
      token.id === "?." || (state.inES6() && token["(name)"]);
  }

  infix("(", function(context, left, that) {
    if (state.option.immed && left && !left.immed && left.id === "function") {
      warning("W062");
    }

    if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
      !sameLine(state.tokens.prev, state.tokens.curr)) {
      warning("W014", state.tokens.curr, state.tokens.curr.id);
    }

    var n = 0;
    var p = [];

    if (left) {
      if (left.type === "(identifier)") {
        var newcapRe = /^[A-Z]([A-Z0-9_$]*[a-z][A-Za-z0-9_$]*)?$/;
        var newcapIgnore = [
          "Array", "Boolean", "Date", "Error", "Function", "Number",
          "Object", "RegExp", "String", "Symbol"
        ];
        if (newcapRe.test(left.value) && newcapIgnore.indexOf(left.value) === -1) {
          if (left.value === "Math") {
            /* istanbul ignore next */
            warning("W063", left);
          } else if (state.option.newcap) {
            warning("W064", left);
          }
        }
      }
    }

    if (state.tokens.next.id !== ")") {
      for (;;) {
        spreadrest("spread");

        p[p.length] = expression(context, 10);
        n += 1;
        if (state.tokens.next.id !== ",") {
          break;
        }
        advance(",");
        checkComma({ allowTrailing: true });

        if (state.tokens.next.id === ")") {
          if (!state.inES8()) {
            warning("W119", state.tokens.curr, "Trailing comma in arguments lists", "8");
          }

          break;
        }
      }
    }

    advance(")");

    if (typeof left === "object") {
      if (!state.inES5() && left.value === "parseInt" && n === 1) {
        warning("W065", state.tokens.curr);
      }
      if (!state.option.evil) {
        if (left.value === "eval" || left.value === "Function" ||
            left.value === "execScript") {
          warning("W061", left);

          // This conditional expression was initially implemented with a typo
          // which prevented the branch's execution in all cases. While
          // enabling the code will produce behavior that is consistent with
          // the other forms of code evaluation that follow, such a change is
          // also technically incompatable with prior versions of JSHint (due
          // to the fact that the behavior was never formally documented). This
          // branch should be enabled as part of a major release.
          //if (p[0] && p[0].id === "(string)") {
          //  addEvalCode(left, p[0]);
          //}
        } else if (p[0] && p[0].id === "(string)" &&
             (left.value === "setTimeout" ||
            left.value === "setInterval")) {
          warning("W066", left);
          addEvalCode(left, p[0]);

        // window.setTimeout/setInterval
        } else if (p[0] && p[0].id === "(string)" &&
             left.value === "." &&
             left.left.value === "window" &&
             (left.right === "setTimeout" ||
            left.right === "setInterval")) {
          warning("W066", left);
          addEvalCode(left, p[0]);
        }
      }
      if (!isTypicalCallExpression(left)) {
        warning("W067", that);
      }
    }

    that.left = left;
    return that;
  }, 155, true).exps = true;

  function peekThroughParens(parens) {
    var pn = state.tokens.next;
    var i = -1;
    var pn1;

    do {
      if (pn.value === "(") {
        parens += 1;
      } else if (pn.value === ")") {
        parens -= 1;
      }

      i += 1;
      pn1 = pn;
      pn = peek(i);
    } while (!(parens === 0 && pn1.value === ")") && pn.type !== "(end)");

    return pn;
  }

  prefix("(", function(context, rbp) {
    var ret, triggerFnExpr, first, last;
    var opening = state.tokens.curr;
    var preceeding = state.tokens.prev;
    var isNecessary = !state.option.singleGroups;
    var pn = peekThroughParens(1);

    if (state.tokens.next.id === "function") {
      triggerFnExpr = state.tokens.next.immed = true;
    }

    // If the balanced grouping operator is followed by a "fat arrow", the
    // current token marks the beginning of a "fat arrow" function and parsing
    // should proceed accordingly.
    if (pn.value === "=>") {
      pn.funct = doFunction(context, { type: "arrow", parsedOpening: true });
      return pn;
    }

    // The ECMA262 grammar requires an expression between the "opening
    // parenthesis" and "close parenthesis" tokens of the grouping operator.
    // However, the "ignore" directive is commonly used to inject values that
    // are not included in the token stream. For example:
    //
    //     return (
    //       /*jshint ignore:start */
    //       <div></div>
    //       /*jshint ignore:end */
    //     );
    //
    // The "empty" grouping operator is permitted in order to tolerate this
    // pattern.
    if (state.tokens.next.id === ")") {
      advance(")");
      return;
    }

    ret = expression(context, 0);

    advance(")", this);

    if (!ret) {
      return;
    }

    ret.paren = true;

    if (state.option.immed && ret && ret.id === "function") {
      if (state.tokens.next.id !== "(" &&
        state.tokens.next.id !== "." && state.tokens.next.id !== "[") {
        warning("W068", this);
      }
    }

    if (ret.id === ",") {
      first = ret.left;
      while (first.id === ",") {
        first = first.left;
      }

      last = ret.right;
    } else {
      first = last = ret;

      if (!isNecessary) {
        // async functions are identified after parsing due to the complexity
        // of disambiguating the `async` keyword.
        if (!triggerFnExpr) {
          triggerFnExpr = ret.id === "async";
        }

        isNecessary =
          // Used to distinguish from an ExpressionStatement which may not
          // begin with the `{` and `function` tokens
          (opening.beginsStmt && (ret.id === "{" || triggerFnExpr)) ||
          // Used to signal that a function expression is being supplied to
          // some other operator.
          (triggerFnExpr &&
            // For parenthesis wrapping a function expression to be considered
            // necessary, the grouping operator should be the left-hand-side of
            // some other operator--either within the parenthesis or directly
            // following them.
            (!isEndOfExpr() || state.tokens.prev.id !== "}")) ||
          // Used to demarcate an arrow function as the left-hand side of some
          // operator.
          (ret.id === "=>" && !isEndOfExpr()) ||
          // Used as the return value of a single-statement arrow function
          (ret.id === "{" && preceeding.id === "=>") ||
          // Used to cover a unary expression as the left-hand side of the
          // exponentiation operator
          (beginsUnaryExpression(ret) && state.tokens.next.id === "**") ||
          // Used to cover a logical operator as the right-hand side of the
          // nullish coalescing operator
          (preceeding.id === "??" && (ret.id === "&&" || ret.id === "||")) ||
          // Used to delineate an integer number literal from a dereferencing
          // punctuator (otherwise interpreted as a decimal point)
          (ret.type === "(number)" &&
            checkPunctuator(pn, ".") && /^\d+$/.test(ret.value)) ||
          // Used to wrap object destructuring assignment
          (opening.beginsStmt && ret.id === "=" && ret.left.id === "{") ||
          // Used to allow optional chaining with other language features which
          // are otherwise restricted.
          (ret.id === "?." &&
              (preceeding.id === "new" || state.tokens.next.type === "(template)"));
      }
    }

    // The operator may be necessary to override the default binding power of
    // neighboring operators (whenever there is an operator in use within the
    // first expression *or* the current group contains multiple expressions)
    if (!isNecessary && (isOperator(first) || first !== last)) {
      isNecessary =
        (rbp > first.lbp) ||
        (rbp > 0 && rbp === first.lbp) ||
        (!isEndOfExpr() && last.rbp < state.tokens.next.lbp);
    }

    if (!isNecessary) {
      warning("W126", opening);
    }

    return ret;
  });

  application("=>").rbp = 161;

  infix("[", function(context, left, that) {
    var e, s, canUseDot;

    if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
      !sameLine(state.tokens.prev, state.tokens.curr)) {
      warning("W014", state.tokens.curr, state.tokens.curr.id);
    }

    e = expression(context & ~prodParams.noin, 0);

    if (e && e.type === "(string)") {
      if (!state.option.evil && (e.value === "eval" || e.value === "execScript")) {
        if (isGlobalEval(left, state)) {
          warning("W061");
        }
      }

      countMember(e.value);
      if (!state.option.sub && reg.identifier.test(e.value)) {
        s = state.syntax[e.value];

        if (s) {
          canUseDot = !isReserved(context, s);
        } else {
          // This branch exists to preserve legacy behavior with version 2.9.5
          // and earlier. In those releases, `eval` and `arguments` were
          // incorrectly interpreted as reserved keywords, so Member
          // Expressions such as `object["eval"]` did not trigger warning W069.
          //
          // TODO: Remove in JSHint 3
          canUseDot = e.value !== "eval" && e.value !== "arguments";
        }

        if (canUseDot) {
          warning("W069", state.tokens.prev, e.value);
        }
      }
    }
    advance("]", that);

    if (e && e.value === "hasOwnProperty" && state.tokens.next.value === "=") {
      warning("W001");
    }

    that.left = left;
    that.right = e;
    return that;
  }, 160, true);

  function comprehensiveArrayExpression(context) {
    var res = {};
    res.exps = true;
    state.funct["(comparray)"].stack();

    // Handle reversed for expressions, used in spidermonkey
    var reversed = false;
    if (state.tokens.next.value !== "for") {
      reversed = true;
      if (!state.inMoz()) {
        warning("W116", state.tokens.next, "for", state.tokens.next.value);
      }
      state.funct["(comparray)"].setState("use");
      res.right = expression(context, 10);
    }

    advance("for");
    if (state.tokens.next.value === "each") {
      advance("each");
      if (!state.inMoz()) {
        warning("W118", state.tokens.curr, "for each");
      }
    }
    advance("(");
    state.funct["(comparray)"].setState("define");
    res.left = expression(context, 130);
    if (_.includes(["in", "of"], state.tokens.next.value)) {
      advance();
    } else {
      /* istanbul ignore next */
      error("E045", state.tokens.curr);
    }
    state.funct["(comparray)"].setState("generate");
    expression(context, 10);

    advance(")");
    if (state.tokens.next.value === "if") {
      advance("if");
      advance("(");
      state.funct["(comparray)"].setState("filter");
      expression(context, 10);
      advance(")");
    }

    if (!reversed) {
      state.funct["(comparray)"].setState("use");
      res.right = expression(context, 10);
    }

    advance("]");
    state.funct["(comparray)"].unstack();
    return res;
  }

  prefix("[", function(context) {
    var blocktype = lookupBlockType();
    if (blocktype.isCompArray) {
      if (!state.option.esnext && !state.inMoz()) {
        warning("W118", state.tokens.curr, "array comprehension");
      }
      return comprehensiveArrayExpression(context);
    } else if (blocktype.isDestAssign) {
      this.destructAssign = destructuringPattern(context, {
          openingParsed: true,
          assignment: true
        });
      return this;
    }
    var b = !sameLine(state.tokens.curr, state.tokens.next);
    this.first = [];
    if (b) {
      indent += state.option.indent;
      if (state.tokens.next.from === indent + state.option.indent) {
        /* istanbul ignore next */
        indent += state.option.indent;
      }
    }
    while (state.tokens.next.id !== "(end)") {
      while (state.tokens.next.id === ",") {
        if (!state.option.elision) {
          if (!state.inES5()) {
            // Maintain compat with old options --- ES5 mode without
            // elision=true will warn once per comma
            warning("W070");
          } else {
            warning("W128");
            do {
              advance(",");
            } while (state.tokens.next.id === ",");
            continue;
          }
        }
        advance(",");
      }

      if (state.tokens.next.id === "]") {
        break;
      }

      spreadrest("spread");

      this.first.push(expression(context, 10));
      if (state.tokens.next.id === ",") {
        advance(",");
        checkComma({ allowTrailing: true });
        if (state.tokens.next.id === "]" && !state.inES5()) {
          warning("W070", state.tokens.curr);
          break;
        }
      } else {
        if (state.option.trailingcomma && state.inES5()) {
          warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
        }
        break;
      }
    }
    if (b) {
      indent -= state.option.indent;
    }
    advance("]", this);
    return this;
  });


  function isMethod() {
    return !!state.funct["(method)"];
  }

  /**
   * Retrieve the value of the next token if it is a valid LiteralPropertyName
   * and optionally advance the parser.
   *
   * @param {number} context - the parsing context; see `prod-params.js` for
   *                           more information
   *
   * @returns {string|undefined} - the value of the identifier, if present
   */
  function propertyName(context) {
    var id = optionalidentifier(context, true);

    if (!id) {
      if (state.tokens.next.id === "(string)") {
        id = state.tokens.next.value;
        advance();
      } else if (state.tokens.next.id === "(number)") {
        id = state.tokens.next.value.toString();
        advance();
      }
    }

    if (id === "hasOwnProperty") {
      warning("W001");
    }

    return id;
  }

  /**
   * @param {Number} context The parsing context
   * @param {Object} [options]
   * @param {token} [options.loneArg] The argument to the function in cases
   *                                  where it was defined using the
   *                                  single-argument shorthand.
   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
   *                                       already been parsed.
   *
   * @returns {{ arity: number, params: Array.<string>, isSimple: boolean }}
   */
  function functionparams(context, options) {
    var next;
    var paramsIds = [];
    var ident;
    var tokens = [];
    var t;
    var pastDefault = false;
    var pastRest = false;
    var arity = 0;
    var loneArg = options && options.loneArg;
    var hasDestructuring = false;

    if (loneArg && loneArg.identifier === true) {
      state.funct["(scope)"].addParam(loneArg.value, loneArg);
      return { arity: 1, params: [ loneArg.value ], isSimple: true };
    }

    next = state.tokens.next;

    if (!options || !options.parsedOpening) {
      advance("(");
    }

    if (state.tokens.next.id === ")") {
      advance(")");
      return;
    }

    function addParam(addParamArgs) {
      state.funct["(scope)"].addParam.apply(state.funct["(scope)"], addParamArgs);
    }

    for (;;) {
      arity++;
      // are added to the param scope
      var currentParams = [];

      pastRest = spreadrest("rest");

      if (_.includes(["{", "["], state.tokens.next.id)) {
        hasDestructuring = true;
        tokens = destructuringPattern(context);
        for (t in tokens) {
          t = tokens[t];
          if (t.id) {
            paramsIds.push(t.id);
            currentParams.push([t.id, t.token]);
          }
        }
      } else {
        ident = identifier(context);

        if (ident) {
          paramsIds.push(ident);
          currentParams.push([ident, state.tokens.curr]);
        } else {
          // Skip invalid parameter.
          while (!checkPunctuators(state.tokens.next, [",", ")"])) advance();
        }
      }

      // It is valid to have a regular argument after a default argument
      // since undefined can be used for missing parameters. Still warn as it is
      // a possible code smell.
      if (pastDefault) {
        if (state.tokens.next.id !== "=") {
          error("W138", state.tokens.curr);
        }
      }
      if (state.tokens.next.id === "=") {
        if (!state.inES6()) {
          warning("W119", state.tokens.next, "default parameters", "6");
        }

        if (pastRest) {
          error("E062", state.tokens.next);
        }

        advance("=");
        pastDefault = true;
        expression(context, 10);
      }

      // now we have evaluated the default expression, add the variable to the param scope
      currentParams.forEach(addParam);
      if (state.tokens.next.id === ",") {
        if (pastRest) {
          warning("W131", state.tokens.next);
        }
        advance(",");
        checkComma({ allowTrailing: true });
      }

      if (state.tokens.next.id === ")") {
        if (state.tokens.curr.id === "," && !state.inES8()) {
          warning("W119", state.tokens.curr, "Trailing comma in function parameters", "8");
        }

        advance(")", next);
        return {
          arity: arity,
          params: paramsIds,
          isSimple: !hasDestructuring && !pastRest && !pastDefault
        };
      }
    }
  }

  /**
   * Factory function for creating objects used to track statistics of function
   * literals.
   *
   * @param {string} name - the identifier name to associate with the function
   * @param {object} [token] - token responsible for creating the function
   *                           object
   * @param {object} [overwrites] - a collection of properties that should
   *                                override the corresponding default value of
   *                                the new "functor" object
   */
  function functor(name, token, overwrites) {
    var funct = {
      "(name)"      : name,
      "(breakage)"  : 0,
      "(loopage)"   : 0,
      // The strictness of the function body is tracked via a dedicated
      // property (as opposed to via the global `state` object) so that the
      // value can be referenced after the body has been fully parsed (i.e.
      // when validating the identifier used in function declarations and
      // function expressions).
      "(isStrict)"  : "unknown",

      "(global)"    : false,

      "(line)"      : null,
      "(character)" : null,
      "(metrics)"   : null,
      "(statement)" : null,
      "(context)"   : null,
      "(scope)"     : null,
      "(comparray)" : null,
      "(yielded)"   : null,
      "(arrow)"     : null,
      "(async)"     : null,
      "(params)"    : null
    };

    if (token) {
      _.extend(funct, {
        "(line)"     : token.line,
        "(character)": token.character,
        "(metrics)"  : createMetrics(token)
      });
    }

    _.extend(funct, overwrites);

    if (funct["(context)"]) {
      funct["(scope)"] = funct["(context)"]["(scope)"];
      funct["(comparray)"]  = funct["(context)"]["(comparray)"];
    }

    return funct;
  }

  /**
   * Determine if the parser has begun parsing executable code.
   *
   * @param {Token} funct - The current "functor" token
   *
   * @returns {boolean}
   */
  function hasParsedCode(funct) {
    return funct["(global)"] && !funct["(verb)"];
  }

  /**
   * This function is used as both a null-denotation method *and* a
   * left-denotation method, meaning the first parameter is overloaded.
   */
  function doTemplateLiteral(context, leftOrRbp) {
    // ASSERT: this.type === "(template)"
    // jshint validthis: true
    var ctx = this.context;
    var noSubst = this.noSubst;
    var depth = this.depth;
    var left = typeof leftOrRbp === "number" ? null : leftOrRbp;

    if (!noSubst) {
      while (!end()) {
        if (!state.tokens.next.template || state.tokens.next.depth > depth) {
          expression(context, 0); // should probably have different rbp?
        } else {
          // skip template start / middle
          advance();
        }
      }
    }

    return {
      id: "(template)",
      type: "(template)",
      tag: left
    };

    function end() {
      if (state.tokens.curr.template && state.tokens.curr.tail &&
          state.tokens.curr.context === ctx) {
        /* istanbul ignore next */
        return true;
      }
      var complete = (state.tokens.next.template && state.tokens.next.tail &&
                      state.tokens.next.context === ctx);
      if (complete) advance();
      return complete || state.tokens.next.isUnclosed;
    }
  }

  /**
   * Parse a function literal.
   *
   * @param {Number} context The parsing context
   * @param {Object} [options]
   * @param {string} [options.name] The identifier belonging to the function (if
   *                                any)
   * @param {token} [options.statement] The statement that triggered creation
   *                                    of the current function.
   * @param {string} [options.type] If specified, either "generator" or "arrow"
   * @param {token} [options.loneArg] The argument to the function in cases
   *                                  where it was defined using the
   *                                  single-argument shorthand
   * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
   *                                       already been parsed
   * @param {string} [options.classExprBinding] Define a function with this
   *                                            identifier in the new function's
   *                                            scope, mimicking the bahavior of
   *                                            class expression names within
   *                                            the body of member functions.
   */
  function doFunction(context, options) {
    var f, token, name, statement, classExprBinding, isGenerator, isArrow,
      isMethod, ignoreLoopFunc;
    var oldOption = state.option;
    var oldIgnored = state.ignored;
    var isAsync = context & prodParams.preAsync;

    if (options) {
      name = options.name;
      statement = options.statement;
      classExprBinding = options.classExprBinding;
      isGenerator = options.type === "generator";
      isArrow = options.type === "arrow";
      isMethod = options.isMethod;
      ignoreLoopFunc = options.ignoreLoopFunc;
    }

    context &= ~prodParams.noin;
    context &= ~prodParams.tryClause;

    if (isAsync) {
      context |= prodParams.async;
    } else {
      context &= ~prodParams.async;
    }

    if (isGenerator) {
      context |= prodParams.yield;
    } else if (!isArrow) {
      context &= ~prodParams.yield;
    }
    context &= ~prodParams.preAsync;

    state.option = Object.create(state.option);
    state.ignored = Object.create(state.ignored);

    state.funct = functor(name || state.nameStack.infer(), state.tokens.next, {
      "(statement)": statement,
      "(context)":   state.funct,
      "(arrow)":     isArrow,
      "(method)":    isMethod,
      "(async)":     isAsync
    });

    f = state.funct;
    token = state.tokens.curr;

    functions.push(state.funct);

    // So that the function is available to itself and referencing itself is not
    // seen as a closure, add the function name to a new scope, but do not
    // test for unused (unused: false)
    // it is a new block scope so that params can override it, it can be block scoped
    // but declarations inside the function don't cause already declared error
    state.funct["(scope)"].stack("functionouter");
    var internallyAccessibleName = !isMethod && (name || classExprBinding);
    if (internallyAccessibleName) {
      state.funct["(scope)"].block.add(internallyAccessibleName,
        classExprBinding ? "class" : "function", state.tokens.curr, false);
    }

    if (!isArrow) {
      state.funct["(scope)"].funct.add("arguments", "var", token, false);
    }

    // create the param scope (params added in functionparams)
    state.funct["(scope)"].stack("functionparams");

    var paramsInfo = functionparams(context, options);

    if (paramsInfo) {
      state.funct["(params)"] = paramsInfo.params;
      state.funct["(hasSimpleParams)"] = paramsInfo.isSimple;
      state.funct["(metrics)"].arity = paramsInfo.arity;
      state.funct["(metrics)"].verifyMaxParametersPerFunction();
    } else {
      state.funct["(params)"] = [];
      state.funct["(metrics)"].arity = 0;
      state.funct["(hasSimpleParams)"] = true;
    }

    if (isArrow) {
      context &= ~prodParams.yield;

      if (!state.inES6(true)) {
        warning("W119", state.tokens.curr, "arrow function syntax (=>)", "6");
      }

      if (!options.loneArg) {
        advance("=>");
      }
    }

    block(context, false, true, true, isArrow);

    if (!state.option.noyield && isGenerator && !state.funct["(yielded)"]) {
      warning("W124", state.tokens.curr);
    }

    state.funct["(metrics)"].verifyMaxStatementsPerFunction();
    state.funct["(metrics)"].verifyMaxComplexityPerFunction();
    state.funct["(unusedOption)"] = state.option.unused;
    state.option = oldOption;
    state.ignored = oldIgnored;
    state.funct["(last)"] = state.tokens.curr.line;
    state.funct["(lastcharacter)"] = state.tokens.curr.character;

    // unstack the params scope
    state.funct["(scope)"].unstack(); // also does usage and label checks

    // unstack the function outer stack
    state.funct["(scope)"].unstack();

    state.funct = state.funct["(context)"];

    if (!ignoreLoopFunc && !state.option.loopfunc && state.funct["(loopage)"]) {
      // If the function we just parsed accesses any non-local variables
      // trigger a warning. Otherwise, the function is safe even within
      // a loop.
      if (f["(outerMutables)"]) {
        warning("W083", token, f["(outerMutables)"].join(", "));
      }
    }

    return f;
  }

  function createMetrics(functionStartToken) {
    return {
      statementCount: 0,
      nestedBlockDepth: -1,
      ComplexityCount: 1,
      arity: 0,

      verifyMaxStatementsPerFunction: function() {
        if (state.option.maxstatements &&
          this.statementCount > state.option.maxstatements) {
          warning("W071", functionStartToken, this.statementCount);
        }
      },

      verifyMaxParametersPerFunction: function() {
        if (_.isNumber(state.option.maxparams) &&
          this.arity > state.option.maxparams) {
          warning("W072", functionStartToken, this.arity);
        }
      },

      verifyMaxNestedBlockDepthPerFunction: function() {
        if (state.option.maxdepth &&
          this.nestedBlockDepth > 0 &&
          this.nestedBlockDepth === state.option.maxdepth + 1) {
          warning("W073", null, this.nestedBlockDepth);
        }
      },

      verifyMaxComplexityPerFunction: function() {
        var max = state.option.maxcomplexity;
        var cc = this.ComplexityCount;
        if (max && cc > max) {
          warning("W074", functionStartToken, cc);
        }
      }
    };
  }

  function increaseComplexityCount() {
    state.funct["(metrics)"].ComplexityCount += 1;
  }

  // Parse assignments that were found instead of conditionals.
  // For example: if (a = 1) { ... }

  function checkCondAssignment(token) {
    if (!token || token.paren) {
      return;
    }

    if (token.id === ",") {
      checkCondAssignment(token.right);
      return;
    }

    switch (token.id) {
    case "=":
    case "+=":
    case "-=":
    case "*=":
    case "%=":
    case "&=":
    case "|=":
    case "^=":
    case "/=":
      if (!state.option.boss) {
        warning("W084", token);
      }
    }
  }

  /**
   * Validate the properties defined within an object literal or class body.
   * See the `saveAccessor` and `saveProperty` functions for more detail.
   *
   * @param {object} props - Collection of objects describing the properties
   *                         encountered
   */
  function checkProperties(props) {
    // Check for lonely setters if in the ES5 mode.
    if (state.inES5()) {
      for (var name in props) {
        if (props[name] && props[name].setterToken && !props[name].getterToken &&
          !props[name].static) {
          warning("W078", props[name].setterToken);
        }
      }
    }
  }

  function metaProperty(context, name, c) {
    if (checkPunctuator(state.tokens.next, ".")) {
      var left = state.tokens.curr.id;
      advance(".");
      var id = identifier(context);
      state.tokens.curr.isMetaProperty = true;
      if (name !== id) {
        error("E057", state.tokens.prev, left, id);
      } else {
        c();
      }
      return state.tokens.curr;
    }
  }

//object literals
  (function(x) {
    x.nud = function(context) {
      var b, f, i, params, t, isGeneratorMethod = false, nextVal;
      var props = Object.create(null); // All properties, including accessors
      var isAsyncMethod = false;

      b = !sameLine(state.tokens.curr, state.tokens.next);
      if (b) {
        indent += state.option.indent;
        if (state.tokens.next.from === indent + state.option.indent) {
          /* istanbul ignore next */
          indent += state.option.indent;
        }
      }

      var blocktype = lookupBlockType();
      if (blocktype.isDestAssign) {
        this.destructAssign = destructuringPattern(context, {
            openingParsed: true,
            assignment: true
          });
        return this;
      }
      state.inObjectBody = true;
      for (;;) {
        if (state.tokens.next.id === "}") {
          break;
        }

        nextVal = state.tokens.next.value;
        if (state.tokens.next.identifier &&
            (peekIgnoreEOL().id === "," || peekIgnoreEOL().id === "}")) {
          if (!state.inES6()) {
            warning("W104", state.tokens.next, "object short notation", "6");
          }
          t = expression(context, 10);
          i = t && t.value;
          if (t) {
            saveProperty(props, i, t);
          }

        } else if (peek().id !== ":" && (nextVal === "get" || nextVal === "set")) {
          advance(nextVal);

          if (!state.inES5()) {
            error("E034");
          }

          if (state.tokens.next.id === "[") {
            i = computedPropertyName(context);
          } else {
            i = propertyName(context);

            // ES6 allows for get() {...} and set() {...} method
            // definition shorthand syntax, so we don't produce an error
            // if linting ECMAScript 6 code.
            if (!i && !state.inES6()) {
              error("E035");
            }
          }

          // We don't want to save this getter unless it's an actual getter
          // and not an ES6 concise method
          if (i) {
            saveAccessor(nextVal, props, i, state.tokens.curr);
          }

          t = state.tokens.next;
          f = doFunction(context, { isMethod: true });
          params = f["(params)"];

          // Don't warn about getter/setter pairs if this is an ES6 concise method
          if (nextVal === "get" && i && params.length) {
            warning("W076", t, params[0], i);
          } else if (nextVal === "set" && i && f["(metrics)"].arity !== 1) {
            warning("W077", t, i);
          }

        } else if (spreadrest("spread")) {
          if (!state.inES9()) {
            warning("W119", state.tokens.next, "object spread property", "9");
          }

          expression(context, 10);
        } else {
          if (state.tokens.next.id === "async" && !checkPunctuators(peek(), ["(", ":"])) {
            if (!state.inES8()) {
              warning("W119", state.tokens.next, "async functions", "8");
            }

            isAsyncMethod = true;
            advance();

            nolinebreak(state.tokens.curr);
          } else {
            isAsyncMethod = false;
          }

          if (state.tokens.next.value === "*" && state.tokens.next.type === "(punctuator)") {
            if (isAsyncMethod && !state.inES9()) {
              warning("W119", state.tokens.next, "async generators", "9");
            } else if (!state.inES6()) {
              warning("W104", state.tokens.next, "generator functions", "6");
            }

            advance("*");
            isGeneratorMethod = true;
          } else {
            isGeneratorMethod = false;
          }

          if (state.tokens.next.id === "[") {
            i = computedPropertyName(context);
            state.nameStack.set(i);
          } else {
            state.nameStack.set(state.tokens.next);
            i = propertyName(context);
            saveProperty(props, i, state.tokens.next);

            if (typeof i !== "string") {
              break;
            }
          }

          if (state.tokens.next.value === "(") {
            if (!state.inES6()) {
              warning("W104", state.tokens.curr, "concise methods", "6");
            }

            doFunction(isAsyncMethod ? context | prodParams.preAsync : context, {
              isMethod: true,
              type: isGeneratorMethod ? "generator" : null
            });
          } else {
            advance(":");
            expression(context, 10);
          }
        }

        countMember(i);

        if (state.tokens.next.id === ",") {
          advance(",");
          checkComma({ allowTrailing: true, property: true });
          if (state.tokens.next.id === ",") {
            /* istanbul ignore next */
            warning("W070", state.tokens.curr);
          } else if (state.tokens.next.id === "}" && !state.inES5()) {
            warning("W070", state.tokens.curr);
          }
        } else {
          if (state.option.trailingcomma && state.inES5()) {
            warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
          }
          break;
        }
      }
      if (b) {
        indent -= state.option.indent;
      }
      advance("}", this);

      checkProperties(props);
      state.inObjectBody = false;

      return this;
    };
    x.fud = function() {
      /* istanbul ignore next */
      error("E036", state.tokens.curr);
    };
  }(delim("{")));

  function destructuringPattern(context, options) {
    var isAssignment = options && options.assignment;

    context &= ~prodParams.noin;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr,
        isAssignment ? "destructuring assignment" : "destructuring binding", "6");
    }

    return destructuringPatternRecursive(context, options);
  }

  function destructuringPatternRecursive(context, options) {
    var ids, idx;
    var identifiers = [];
    var openingParsed = options && options.openingParsed;
    var isAssignment = options && options.assignment;
    var recursiveOptions = isAssignment ? { assignment: isAssignment } : null;
    var firstToken = openingParsed ? state.tokens.curr : state.tokens.next;

    var nextInnerDE = function() {
      var ident;
      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
        ids = destructuringPatternRecursive(context, recursiveOptions);
        for (idx = 0; idx < ids.length; idx++) {
          identifiers.push({ id: ids[idx].id, token: ids[idx].token });
        }
      } else if (checkPunctuator(state.tokens.next, ",")) {
        identifiers.push({ id: null, token: state.tokens.curr });
      } else if (checkPunctuator(state.tokens.next, "(")) {
        advance("(");
        nextInnerDE();
        advance(")");
      } else {
        if (isAssignment) {
          var assignTarget = expression(context, 20);
          if (assignTarget) {
            checkLeftSideAssign(context, assignTarget);

            // if the target was a simple identifier, add it to the list to return
            if (assignTarget.identifier) {
              ident = assignTarget.value;
            }
          }
        } else {
          ident = identifier(context);
        }
        if (ident) {
          identifiers.push({ id: ident, token: state.tokens.curr });
        }
      }
    };

    var assignmentProperty = function(context) {
      var id, expr;

      if (checkPunctuator(state.tokens.next, "[")) {
        advance("[");
        expression(context, 10);
        advance("]");
        advance(":");
        nextInnerDE();
      } else if (state.tokens.next.id === "(string)" ||
                 state.tokens.next.id === "(number)") {
        advance();
        advance(":");
        nextInnerDE();
      } else {
        // this id will either be the property name or the property name and the assigning identifier
        var isRest = spreadrest("rest");

        if (isRest) {
          if (!state.inES9()) {
            warning("W119", state.tokens.next, "object rest property", "9");
          }

          // Due to visual symmetry with the array rest property (and the early
          // design of the language feature), developers may mistakenly assume
          // any expression is valid in this position. If the next token is not
          // an identifier, attempt to parse an expression and issue an error.
          // order to recover more gracefully from this condition.
          if (state.tokens.next.type === "(identifier)") {
            id = identifier(context);
          } else {
            expr = expression(context, 10);
            error("E030", expr, expr.value);
          }
        } else {
          id = identifier(context);
        }

        if (!isRest && checkPunctuator(state.tokens.next, ":")) {
          advance(":");
          nextInnerDE();
        } else if (id) {
          // in this case we are assigning (not declaring), so check assignment
          if (isAssignment) {
            checkLeftSideAssign(context, state.tokens.curr);
          }
          identifiers.push({ id: id, token: state.tokens.curr });
        }

        if (isRest && checkPunctuator(state.tokens.next, ",")) {
          warning("W130", state.tokens.next);
        }
      }
    };

    var id, value;
    if (checkPunctuator(firstToken, "[")) {
      if (!openingParsed) {
        advance("[");
      }
      if (checkPunctuator(state.tokens.next, "]")) {
        warning("W137", state.tokens.curr);
      }
      var element_after_rest = false;
      while (!checkPunctuator(state.tokens.next, "]")) {
        var isRest = spreadrest("rest");

        nextInnerDE();

        if (isRest && !element_after_rest &&
            checkPunctuator(state.tokens.next, ",")) {
          warning("W130", state.tokens.next);
          element_after_rest = true;
        }
        if (!isRest && checkPunctuator(state.tokens.next, "=")) {
          if (checkPunctuator(state.tokens.prev, "...")) {
            /* istanbul ignore next */
            advance("]");
          } else {
            advance("=");
          }
          id = state.tokens.prev;
          value = expression(context, 10);
          if (value && value.identifier && value.value === "undefined") {
            warning("W080", id, id.value);
          }
        }
        if (!checkPunctuator(state.tokens.next, "]")) {
          advance(",");
        }
      }
      advance("]");
    } else if (checkPunctuator(firstToken, "{")) {

      if (!openingParsed) {
        advance("{");
      }
      if (checkPunctuator(state.tokens.next, "}")) {
        warning("W137", state.tokens.curr);
      }
      while (!checkPunctuator(state.tokens.next, "}")) {
        assignmentProperty(context);
        if (checkPunctuator(state.tokens.next, "=")) {
          advance("=");
          id = state.tokens.prev;
          value = expression(context, 10);
          if (value && value.identifier && value.value === "undefined") {
            warning("W080", id, id.value);
          }
        }
        if (!checkPunctuator(state.tokens.next, "}")) {
          advance(",");
          if (checkPunctuator(state.tokens.next, "}")) {
            // Trailing comma
            // ObjectBindingPattern: { BindingPropertyList , }
            break;
          }
        }
      }
      advance("}");
    }
    return identifiers;
  }

  function destructuringPatternMatch(tokens, value) {
    var first = value.first;

    if (!first)
      return;

    _.zip(tokens, Array.isArray(first) ? first : [ first ]).forEach(function(val) {
      var token = val[0];
      var value = val[1];

      if (token && value)
        token.first = value;
      else if (token && token.first && !value)
        /* istanbul ignore next */
        warning("W080", token.first, token.first.value);
    });
  }

  function blockVariableStatement(type, statement, context) {
    // used for both let and const statements

    var noin = context & prodParams.noin;
    var isLet = type === "let";
    var isConst = type === "const";
    var tokens, lone, value, letblock;

    if (!state.inES6()) {
      warning("W104", state.tokens.curr, type, "6");
    }

    if (isLet && isMozillaLet()) {
      advance("(");
      state.funct["(scope)"].stack();
      letblock = true;
      statement.declaration = false;
    }

    statement.first = [];
    for (;;) {
      var names = [];
      if (_.includes(["{", "["], state.tokens.next.value)) {
        tokens = destructuringPattern(context);
        lone = false;
      } else {
        tokens = [ { id: identifier(context), token: state.tokens.curr } ];
        lone = true;
      }

      // A `const` declaration without an initializer is permissible within the
      // head of for-in and for-of statements. If this binding list is being
      // parsed as part of a `for` statement of any kind, allow the initializer
      // to be omitted. Although this may erroneously allow such forms from
      // "C-style" `for` statements (i.e. `for (const x;;) {}`, the `for`
      // statement logic includes dedicated logic to issue the error for such
      // cases.
      if (!noin && isConst && state.tokens.next.id !== "=") {
        warning("E012", state.tokens.curr, state.tokens.curr.value);
      }

      for (var t in tokens) {
        if (tokens.hasOwnProperty(t)) {
          t = tokens[t];

          // It is a Syntax Error if the BoundNames of BindingList contains
          // "let".
          if (t.id === "let") {
            /* istanbul ignore next */
            warning("W024", t.token, t.id);
          }

          if (state.funct["(scope)"].block.isGlobal()) {
            if (predefined[t.id] === false) {
              warning("W079", t.token, t.id);
            }
          }
          if (t.id) {
            state.funct["(scope)"].addbinding(t.id, {
              type: type,
              token: t.token });
            names.push(t.token);
          }
        }
      }

      if (state.tokens.next.id === "=") {
        statement.hasInitializer = true;

        advance("=");
        if (!noin && peek(0).id === "=" && state.tokens.next.identifier) {
          warning("W120", state.tokens.next, state.tokens.next.value);
        }
        var id = state.tokens.prev;
        value = expression(context, 10);
        if (value) {
          if (value.identifier && value.value === "undefined") {
            warning("W080", id, id.value);
          }
          if (!lone) {
            destructuringPatternMatch(names, value);
          }
        }
      }

      // Bindings are not immediately initialized in for-in and for-of
      // statements. As with `const` initializers (described above), the `for`
      // statement parsing logic includes
      if (state.tokens.next.value !== "in" && state.tokens.next.value !== "of") {
        for (t in tokens) {
          if (tokens.hasOwnProperty(t)) {
            t = tokens[t];
            state.funct["(scope)"].initialize(t.id);
          }
        }
      }

      statement.first = statement.first.concat(names);

      if (state.tokens.next.id !== ",") {
        break;
      }

      statement.hasComma = true;
      advance(",");
      checkComma();
    }
    if (letblock) {
      advance(")");
      block(context, true, true);
      statement.block = true;
      state.funct["(scope)"].unstack();
    }

    return statement;
  }

  var conststatement = stmt("const", function(context) {
    return blockVariableStatement("const", this, context);
  });
  conststatement.exps = true;
  conststatement.declaration = true;


  /**
   * Determine if the current `let` token designates the beginning of a "let
   * block" or "let expression" as implemented in the Mozilla SpiderMonkey
   * engine.
   *
   * This function will only return `true` if Mozilla extensions have been
   * enabled. It would be preferable to detect the language feature regardless
   * of the parser's state because this would allow JSHint to instruct users to
   * enable the `moz` option where necessary. This is not possible because the
   * language extension is not compatible with standard JavaScript. For
   * example, the following program code may describe a "let block" or a
   * function invocation:
   *
   *     let(x)
   *     {
   *       typeof x;
   *     }
   *
   * @returns {boolean}
   */
  function isMozillaLet() {
    return state.tokens.next.id === "(" && state.inMoz();
  }
  var letstatement = stmt("let", function(context) {
    return blockVariableStatement("let", this, context);
  });
  letstatement.nud = function(context, rbp) {
    if (isMozillaLet()) {
      // create a new block scope we use only for the current expression
      state.funct["(scope)"].stack();
      advance("(");
      state.tokens.prev.fud(context);
      advance(")");
      expression(context, rbp);
      state.funct["(scope)"].unstack();
    } else {
      this.exps = false;
      return state.syntax["(identifier)"].nud.apply(this, arguments);
    }
  };
  letstatement.meta = { es5: true, isFutureReservedWord: false, strictOnly: true };
  letstatement.exps = true;
  letstatement.declaration = true;
  letstatement.useFud = function(context) {
    var next = state.tokens.next;
    var nextIsBindingName;

    if (this.line !== next.line && !state.inES6()) {
      return false;
    }

    // JSHint generally interprets `let` as a reserved word even though it is
    // not considered as such by the ECMAScript specification because doing so
    // simplifies parsing logic. It is special-cased here so that code such as
    //
    //     let
    //     let
    //
    // is correctly interpreted as an invalid LexicalBinding. (Without this
    // consideration, the code above would be parsed as two
    // IdentifierReferences.)
    nextIsBindingName = next.identifier && (!isReserved(context, next) ||
      next.id === "let");

    return nextIsBindingName || checkPunctuators(next, ["{", "["]) ||
      isMozillaLet();
  };

  var varstatement = stmt("var", function(context) {
    var noin = context & prodParams.noin;
    var tokens, lone, value, id;

    this.first = [];
    for (;;) {
      var names = [];
      if (_.includes(["{", "["], state.tokens.next.value)) {
        tokens = destructuringPattern(context);
        lone = false;
      } else {
        tokens = [];
        id = identifier(context);

        if (id) {
          tokens.push({ id: id, token: state.tokens.curr });
        }

        lone = true;
      }

      if (state.option.varstmt) {
        warning("W132", this);
      }


      for (var t in tokens) {
        if (tokens.hasOwnProperty(t)) {
          t = tokens[t];
          if (state.funct["(global)"] && !state.impliedClosure()) {
            if (predefined[t.id] === false) {
              warning("W079", t.token, t.id);
            } else if (state.option.futurehostile === false) {
              if ((!state.inES5() && vars.ecmaIdentifiers[5][t.id] === false) ||
                (!state.inES6() && vars.ecmaIdentifiers[6][t.id] === false)) {
                warning("W129", t.token, t.id);
              }
            }
          }
          if (t.id) {
            state.funct["(scope)"].addbinding(t.id, {
              type: "var",
              token: t.token });

            names.push(t.token);
          }
        }
      }

      if (state.tokens.next.id === "=") {
        this.hasInitializer = true;

        state.nameStack.set(state.tokens.curr);

        advance("=");
        if (peek(0).id === "=" && state.tokens.next.identifier) {
          if (!noin &&
              !state.funct["(params)"] ||
              state.funct["(params)"].indexOf(state.tokens.next.value) === -1) {
            warning("W120", state.tokens.next, state.tokens.next.value);
          }
        }
        id = state.tokens.prev;
        value = expression(context, 10);
        if (value) {
          if (!state.funct["(loopage)"] && value.identifier &&
            value.value === "undefined") {
            warning("W080", id, id.value);
          }
          if (!lone) {
            destructuringPatternMatch(names, value);
          }
        }
      }

      this.first = this.first.concat(names);

      if (state.tokens.next.id !== ",") {
        break;
      }
      this.hasComma = true;
      advance(",");
      checkComma();
    }

    return this;
  });
  varstatement.exps = true;

  blockstmt("function", function(context) {
    var inexport = context & prodParams.export;
    var generator = false;
    var isAsync = context & prodParams.preAsync;
    var labelType = "";

    if (isAsync) {
      labelType = "async ";
    }

    if (state.tokens.next.value === "*") {
      if (isAsync && !state.inES9()) {
        warning("W119", state.tokens.prev, "async generators", "9");
      } else if (!isAsync && !state.inES6(true)) {
        warning("W119", state.tokens.next, "function*", "6");
      }

      advance("*");
      labelType += "generator ";
      generator = true;
    }

    labelType += "function";

    if (inblock) {
      warning("W082", state.tokens.curr);
    }
    this.name = optionalidentifier(context) ? state.tokens.curr : null;

    if (!this.name) {
      if (!inexport) {
        warning("W025");
      }
    } else {
      state.funct["(scope)"].addbinding(this.name.value, {
        type: labelType,
        token: state.tokens.curr,
        initialized: true });
    }

    var f = doFunction(context, {
      name: this.name && this.name.value,
      statement: this,
      type: generator ? "generator" : null,
      ignoreLoopFunc: inblock // a declaration may already have warned
    });

    // If the function declaration is strict because the surrounding code is
    // strict, the invalid name will trigger E008 when the scope manager
    // attempts to create a binding in the strict environment record. An error
    // should only be signaled here when the function itself enables strict
    // mode (the scope manager will not report an error because a declaration
    // does not introduce a binding into the function's environment record).
    var enablesStrictMode = f["(isStrict)"] && !state.isStrict();
    if (this.name && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
      enablesStrictMode) {
      error("E008", this.name);
    }

    // Although the parser correctly recognizes the statement boundary in this
    // condition, it's support for the invalid "empty grouping" expression
    // makes it tolerant of productions such as `function f() {}();`.
    if (state.tokens.next.id === "(" && peek().id === ")" && peek(1).id !== "=>" &&
      state.tokens.next.line === state.tokens.curr.line) {
      error("E039");
    }
    return this;
  }).declaration = true;

  prefix("function", function(context) {
    var generator = false;
    var isAsync = context & prodParams.preAsync;

    if (state.tokens.next.value === "*") {
      if (isAsync && !state.inES9()) {
        warning("W119", state.tokens.prev, "async generators", "9");
      } else if (!isAsync && !state.inES6(true)) {
        warning("W119", state.tokens.curr, "function*", "6");
      }

      advance("*");
      generator = true;
    }

    // This context modification restricts the use of `await` as the optional
    // BindingIdentifier in async function expressions.
    this.name = optionalidentifier(isAsync ? context | prodParams.async : context) ?
      state.tokens.curr : null;

    var f = doFunction(context, {
      name: this.name && this.name.value,
      type: generator ? "generator" : null
    });

    if (generator && this.name && this.name.value === "yield") {
      error("E024", this.name, "yield");
    }

    if (this.name && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
      f["(isStrict)"]) {
      error("E008", this.name);
    }

    return this;
  });

  blockstmt("if", function(context) {
    var t = state.tokens.next;
    increaseComplexityCount();
    advance("(");
    var expr = expression(context, 0);

    if (!expr) {
      quit("E041", this);
    }

    checkCondAssignment(expr);

    // When the if is within a for-in loop, check if the condition
    // starts with a negation operator
    var forinifcheck = null;
    if (state.option.forin && state.forinifcheckneeded) {
      state.forinifcheckneeded = false; // We only need to analyze the first if inside the loop
      forinifcheck = state.forinifchecks[state.forinifchecks.length - 1];
      if (expr.type === "(punctuator)" && expr.value === "!") {
        forinifcheck.type = "(negative)";
      } else {
        forinifcheck.type = "(positive)";
      }
    }

    advance(")", t);
    var s = block(context, true, true);

    // When the if is within a for-in loop and the condition has a negative form,
    // check if the body contains nothing but a continue statement
    if (forinifcheck && forinifcheck.type === "(negative)") {
      if (s && s[0] && s[0].type === "(identifier)" && s[0].value === "continue") {
        forinifcheck.type = "(negative-with-continue)";
      }
    }

    if (state.tokens.next.id === "else") {
      advance("else");
      if (state.tokens.next.id === "if" || state.tokens.next.id === "switch") {
        statement(context);
      } else {
        block(context, true, true);
      }
    }
    return this;
  });

  blockstmt("try", function(context) {
    var b;
    var hasParameter = false;

    function catchParameter() {
      advance("(");

      if (checkPunctuators(state.tokens.next, ["[", "{"])) {
        var tokens = destructuringPattern(context);
        _.each(tokens, function(token) {
          if (token.id) {
            state.funct["(scope)"].addParam(token.id, token.token, "exception");
          }
        });
      } else if (state.tokens.next.type !== "(identifier)") {
        warning("E030", state.tokens.next, state.tokens.next.value);
      } else {
        // only advance if an identifier is present. This allows JSHint to
        // recover from the case where no value is specified.
        state.funct["(scope)"].addParam(identifier(context), state.tokens.curr, "exception");
      }

      if (state.tokens.next.value === "if") {
        if (!state.inMoz()) {
          warning("W118", state.tokens.curr, "catch filter");
        }
        advance("if");
        expression(context, 0);
      }

      advance(")");
    }

    block(context | prodParams.tryClause, true);

    while (state.tokens.next.id === "catch") {
      increaseComplexityCount();
      if (b && (!state.inMoz())) {
        warning("W118", state.tokens.next, "multiple catch blocks");
      }
      advance("catch");
      if (state.tokens.next.id !== "{") {
        state.funct["(scope)"].stack("catchparams");
        hasParameter = true;
        catchParameter();
      } else if (!state.inES10()) {
        warning("W119", state.tokens.curr, "optional catch binding", "10");
      }
      block(context, false);

      if (hasParameter) {
        state.funct["(scope)"].unstack();
        hasParameter = false;
      }
      b = true;
    }

    if (state.tokens.next.id === "finally") {
      advance("finally");
      block(context, true);
      return;
    }

    if (!b) {
      error("E021", state.tokens.next, "catch", state.tokens.next.value);
    }

    return this;
  });

  blockstmt("while", function(context) {
    var t = state.tokens.next;
    state.funct["(breakage)"] += 1;
    state.funct["(loopage)"] += 1;
    increaseComplexityCount();
    advance("(");
    checkCondAssignment(expression(context, 0));
    advance(")", t);
    block(context, true, true);
    state.funct["(breakage)"] -= 1;
    state.funct["(loopage)"] -= 1;
    return this;
  }).labelled = true;

  blockstmt("with", function(context) {
    var t = state.tokens.next;
    if (state.isStrict()) {
      error("E010", state.tokens.curr);
    } else if (!state.option.withstmt) {
      warning("W085", state.tokens.curr);
    }

    advance("(");
    expression(context, 0);
    advance(")", t);
    block(context, true, true);

    return this;
  });

  blockstmt("switch", function(context) {
    var t = state.tokens.next;
    var g = false;
    var noindent = false;
    var seenCase = false;

    state.funct["(breakage)"] += 1;
    advance("(");
    checkCondAssignment(expression(context, 0));
    advance(")", t);
    t = state.tokens.next;
    advance("{");
    state.funct["(scope)"].stack();

    if (state.tokens.next.from === indent)
      noindent = true;

    if (!noindent)
      indent += state.option.indent;

    for (;;) {
      switch (state.tokens.next.id) {
      case "case":
        switch (state.funct["(verb)"]) {
        case "yield":
        case "break":
        case "case":
        case "continue":
        case "return":
        case "switch":
        case "throw":
          break;
        case "default":
          if (state.option.leanswitch) {
            warning("W145", state.tokens.next);
          }

          break;
        default:
          // You can tell JSHint that you don't use break intentionally by
          // adding a comment /* falls through */ on a line just before
          // the next `case`.
          if (!state.tokens.curr.caseFallsThrough) {
            warning("W086", state.tokens.curr, "case");
          }
        }

        advance("case");
        expression(context, 0);
        seenCase = true;
        increaseComplexityCount();
        g = true;
        advance(":");
        state.funct["(verb)"] = "case";
        break;
      case "default":
        switch (state.funct["(verb)"]) {
        case "yield":
        case "break":
        case "continue":
        case "return":
        case "throw":
          break;
        case "case":
          if (state.option.leanswitch) {
            warning("W145", state.tokens.curr);
          }

          break;
        default:
          // Do not display a warning if 'default' is the first statement or if
          // there is a special /* falls through */ comment.
          if (seenCase && !state.tokens.curr.caseFallsThrough) {
            warning("W086", state.tokens.curr, "default");
          }
        }

        advance("default");
        g = true;
        advance(":");
        state.funct["(verb)"] = "default";
        break;
      case "}":
        if (!noindent)
          indent -= state.option.indent;

        advance("}", t);
        state.funct["(scope)"].unstack();
        state.funct["(breakage)"] -= 1;
        state.funct["(verb)"] = undefined;
        return;
      /* istanbul ignore next */
      case "(end)":
        error("E023", state.tokens.next, "}");
        return;
      default:
        indent += state.option.indent;
        if (g) {
          switch (state.tokens.curr.id) {
          /* istanbul ignore next */
          case ",":
            error("E040");
            return;
          case ":":
            g = false;
            statements(context);
            break;
          /* istanbul ignore next */
          default:
            error("E025", state.tokens.curr);
            return;
          }
        } else {
          /* istanbul ignore else */
          if (state.tokens.curr.id === ":") {
            advance(":");
            error("E024", state.tokens.curr, ":");
            statements(context);
          } else {
            error("E021", state.tokens.next, "case", state.tokens.next.value);
            return;
          }
        }
        indent -= state.option.indent;
      }
    }
  }).labelled = true;

  stmt("debugger", function() {
    if (!state.option.debug) {
      warning("W087", this);
    }
    return this;
  }).exps = true;

  (function() {
    var x = stmt("do", function(context) {
      state.funct["(breakage)"] += 1;
      state.funct["(loopage)"] += 1;
      increaseComplexityCount();

      this.first = block(context, true, true);
      advance("while");
      var t = state.tokens.next;
      advance("(");
      checkCondAssignment(expression(context, 0));
      advance(")", t);
      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;
      return this;
    });
    x.labelled = true;
    x.exps = true;
  }());

  blockstmt("for", function(context) {
    var s, t = state.tokens.next;
    var letscope = false;
    var isAsync = false;
    var foreachtok = null;

    if (t.value === "each") {
      foreachtok = t;
      advance("each");
      if (!state.inMoz()) {
        warning("W118", state.tokens.curr, "for each");
      }
    }

    if (state.tokens.next.identifier && state.tokens.next.value === "await") {
      advance("await");
      isAsync = true;

      if (!(context & prodParams.async)) {
        error("E024", state.tokens.curr, "await");
      } else if (!state.inES9()) {
        warning("W119", state.tokens.curr, "asynchronous iteration", "9");
      }
    }

    increaseComplexityCount();
    advance("(");

    // what kind of for(…) statement it is? for(…of…)? for(…in…)? for(…;…;…)?
    var nextop; // contains the token of the "in" or "of" operator
    var comma; // First comma punctuator at level 0
    var initializer; // First initializer at level 0
    var bindingPower;
    var targets;
    var target;
    var decl;
    var afterNext = peek();

    var headContext = context | prodParams.noin;

    if (state.tokens.next.id === "var") {
      advance("var");
      decl = state.tokens.curr.fud(headContext);
      comma = decl.hasComma ? decl : null;
      initializer = decl.hasInitializer ? decl : null;
    } else if (state.tokens.next.id === "const" ||
      // The "let" keyword only signals a lexical binding if it is followed by
      // an identifier, `{`, or `[`. Otherwise, it should be parsed as an
      // IdentifierReference (i.e. in a subsquent branch).
      (state.tokens.next.id === "let" &&
        ((afterNext.identifier && afterNext.id !== "in") ||
         checkPunctuators(afterNext, ["{", "["])))) {
      advance(state.tokens.next.id);
      // create a new block scope
      letscope = true;
      state.funct["(scope)"].stack();
      decl = state.tokens.curr.fud(headContext);
      comma = decl.hasComma ? decl : null;
      initializer = decl.hasInitializer ? decl : null;
    } else if (!checkPunctuator(state.tokens.next, ";")) {
      targets = [];

      while (state.tokens.next.value !== "in" &&
        state.tokens.next.value !== "of" &&
        !checkPunctuator(state.tokens.next, ";")) {

        if (checkPunctuators(state.tokens.next, ["{", "["])) {
          destructuringPattern(headContext, { assignment: true })
            .forEach(function(elem) {
              this.push(elem.token);
            }, targets);
          if (checkPunctuator(state.tokens.next, "=")) {
            advance("=");
            initializer = state.tokens.curr;
            expression(headContext, 10);
          }
        } else {
          target = expression(headContext, 10);

          if (target) {
            if (target.type === "(identifier)") {
              targets.push(target);
            } else if (checkPunctuator(target, "=")) {
              initializer = target;
              targets.push(target);
            }
          }
        }

        if (checkPunctuator(state.tokens.next, ",")) {
          advance(",");

          if (!comma) {
            comma = state.tokens.curr;
          }
        }
      }

      //checkLeftSideAssign(target, nextop);

      // In the event of a syntax error, do not issue warnings regarding the
      // implicit creation of bindings.
      if (!initializer && !comma) {
        targets.forEach(function(token) {
          if (!state.funct["(scope)"].has(token.value)) {
            warning("W088", token, token.value);
          }
        });
      }
    }

    nextop = state.tokens.next;

    if (isAsync && nextop.value !== "of") {
      error("E066", nextop);
    }

    // if we're in a for (… in|of …) statement
    if (_.includes(["in", "of"], nextop.value)) {
      if (nextop.value === "of") {
        bindingPower = 20;

        if (!state.inES6()) {
          warning("W104", nextop, "for of", "6");
        }
      } else {
        bindingPower = 0;
      }
      if (comma) {
        error("W133", comma, nextop.value, "more than one ForBinding");
      }
      if (initializer) {
        error("W133", initializer, nextop.value, "initializer is forbidden");
      }
      if (target && !comma && !initializer) {
        checkLeftSideAssign(context, target, nextop);
      }

      advance(nextop.value);

      // The binding power is variable because for-in statements accept any
      // Expression in this position, while for-of statements are limited to
      // AssignmentExpressions. For example:
      //
      //     for ( LeftHandSideExpression in Expression ) Statement
      //     for ( LeftHandSideExpression of AssignmentExpression ) Statement
      expression(context, bindingPower);
      advance(")", t);

      if (nextop.value === "in" && state.option.forin) {
        state.forinifcheckneeded = true;

        if (state.forinifchecks === undefined) {
          state.forinifchecks = [];
        }

        // Push a new for-in-if check onto the stack. The type will be modified
        // when the loop's body is parsed and a suitable if statement exists.
        state.forinifchecks.push({
          type: "(none)"
        });
      }

      state.funct["(breakage)"] += 1;
      state.funct["(loopage)"] += 1;

      s = block(context, true, true);

      if (nextop.value === "in" && state.option.forin) {
        if (state.forinifchecks && state.forinifchecks.length > 0) {
          var check = state.forinifchecks.pop();

          if (// No if statement or not the first statement in loop body
              s && s.length > 0 && (typeof s[0] !== "object" || s[0].value !== "if") ||
              // Positive if statement is not the only one in loop body
              check.type === "(positive)" && s.length > 1 ||
              // Negative if statement but no continue
              check.type === "(negative)") {
            warning("W089", this);
          }
        }

        // Reset the flag in case no if statement was contained in the loop body
        state.forinifcheckneeded = false;
      }

      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;

    } else {
      if (foreachtok) {
        error("E045", foreachtok);
      }

      advance(";");
      if (decl && decl.first && decl.first[0]) {
        if (decl.value === "const"  && !decl.hasInitializer) {
          warning("E012", decl, decl.first[0].value);
        }

        decl.first.forEach(function(token) {
          state.funct["(scope)"].initialize(token.value);
        });
      }

      // start loopage after the first ; as the next two expressions are executed
      // on every loop
      state.funct["(loopage)"] += 1;
      if (state.tokens.next.id !== ";") {
        checkCondAssignment(expression(context, 0));
      }

      advance(";");
      if (state.tokens.next.id === ";") {
        error("E021", state.tokens.next, ")", ";");
      }
      if (state.tokens.next.id !== ")") {
        for (;;) {
          expression(context, 0);
          if (state.tokens.next.id !== ",") {
            break;
          }
          advance(",");
          checkComma();
        }
      }
      advance(")", t);
      state.funct["(breakage)"] += 1;
      block(context, true, true);
      state.funct["(breakage)"] -= 1;
      state.funct["(loopage)"] -= 1;
    }

    // unstack loop blockscope
    if (letscope) {
      state.funct["(scope)"].unstack();
    }
    return this;
  }).labelled = true;


  stmt("break", function() {
    var v = state.tokens.next.value;

    if (state.tokens.next.identifier &&
        sameLine(state.tokens.curr, state.tokens.next)) {
      if (!state.funct["(scope)"].funct.hasLabel(v)) {
        warning("W090", state.tokens.next, v);
      }
      this.first = state.tokens.next;
      advance();
    } else {
      if (state.funct["(breakage)"] === 0)
        warning("W052", state.tokens.next, this.value);
    }

    reachable(this);

    return this;
  }).exps = true;


  stmt("continue", function() {
    var v = state.tokens.next.value;

    if (state.funct["(breakage)"] === 0 || !state.funct["(loopage)"]) {
      warning("W052", state.tokens.next, this.value);
    }

    if (state.tokens.next.identifier) {
      if (sameLine(state.tokens.curr, state.tokens.next)) {
        if (!state.funct["(scope)"].funct.hasLabel(v)) {
          warning("W090", state.tokens.next, v);
        }
        this.first = state.tokens.next;
        advance();
      }
    }

    reachable(this);

    return this;
  }).exps = true;


  stmt("return", function(context) {
    if (sameLine(this, state.tokens.next)) {
      if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
        this.first = expression(context, 0);

        if (this.first &&
            this.first.type === "(punctuator)" && this.first.value === "=" &&
            !this.first.paren && !state.option.boss) {
          warning("W093", this.first);
        }

        if (state.option.noreturnawait && context & prodParams.async &&
            !(context & prodParams.tryClause) &&
            this.first.identifier && this.first.value === "await") {
          warning("W146", this.first);
        }
      }
    } else {
      if (state.tokens.next.type === "(punctuator)" &&
        ["[", "{", "+", "-"].indexOf(state.tokens.next.value) > -1) {
        nolinebreak(this); // always warn (Line breaking error)
      }
    }

    reachable(this);

    return this;
  }).exps = true;

  prefix("await", function(context) {
    if (context & prodParams.async) {
      // If the parameters of the current function scope have not been defined,
      // it is because the current expression is contained within the parameter
      // list.
      if (!state.funct["(params)"]) {
        error("E024", this, "await");
      }

      expression(context, 10);
      return this;
    } else {
      this.exps = false;
      return state.syntax["(identifier)"].nud.apply(this, arguments);
    }
  }).exps = true;

  (function(asyncSymbol) {
    asyncSymbol.meta = { es5: true, isFutureReservedWord: true, strictOnly: true };
    asyncSymbol.isFunc = function() {
      var next = state.tokens.next;
      var afterParens;

      if (this.line !== next.line) {
        return false;
      }

      if (next.id === "function") {
        return true;
      }

      if (next.id === "(") {
        afterParens = peekThroughParens(0);

        return afterParens.id === "=>";
      }

      if (next.identifier) {
        return peek().id === "=>";
      }

      return false;
    };
    asyncSymbol.useFud = asyncSymbol.isFunc;
    // async function declaration
    asyncSymbol.fud = function(context) {
      if (!state.inES8()) {
        warning("W119", this, "async functions", "8");
      }
      context |= prodParams.preAsync;
      context |= prodParams.initial;
      this.func = expression(context, 0);
      this.block = this.func.block;
      this.exps = this.func.exps;
      return this;
    };
    asyncSymbol.exps = true;
    delete asyncSymbol.reserved;
  }(prefix("async", function(context, rbp) {
    if (this.isFunc(context)) {
      if (!state.inES8()) {
        warning("W119", this, "async functions", "8");
      }

      context |= prodParams.preAsync;
      this.func = expression(context, rbp);
      this.identifier = false;
      return this;
    }

    this.exps = false;
    return state.syntax["(identifier)"].nud.apply(this, arguments);
  })));

  (function(yieldSymbol) {
    yieldSymbol.rbp = yieldSymbol.lbp = 25;
    yieldSymbol.exps = true;
  })(prefix("yield", function(context) {
    if (state.inMoz()) {
      return mozYield.call(this, context);
    }

    if (!(context & prodParams.yield)) {
      this.exps = false;
      return state.syntax["(identifier)"].nud.apply(this, arguments);
    }

    var prev = state.tokens.prev;

    // If the parameters of the current function scope have not been defined,
    // it is because the current expression is contained within the parameter
    // list.
    if (!state.funct["(params)"]) {
      error("E024", this, "yield");
    }

    if (!this.beginsStmt && prev.lbp > 30 && !checkPunctuators(prev, ["("])) {
      error("E061", this);
    }

    if (!state.inES6()) {
      warning("W104", state.tokens.curr, "yield", "6");
    }
    state.funct["(yielded)"] = true;

    if (state.tokens.next.value === "*") {
      advance("*");
    }

    // Parse operand
    if (state.tokens.curr.value === "*" || sameLine(state.tokens.curr, state.tokens.next)) {
      if (state.tokens.next.nud) {

        nobreaknonadjacent(state.tokens.curr, state.tokens.next);
        this.first = expression(context, 10);

        if (this.first.type === "(punctuator)" && this.first.value === "=" &&
            !this.first.paren && !state.option.boss) {
          warning("W093", this.first);
        }
      } else if (state.tokens.next.led) {
        if (state.tokens.next.id !== ",") {
          error("W017", state.tokens.next);
        }
      }
    }

    return this;
  }));

  /**
   * Parsing logic for non-standard Mozilla implementation of `yield`
   * expressions.
   */
  var mozYield = function(context) {
    var prev = state.tokens.prev;
    if (state.inES6(true) && !(context & prodParams.yield)) {
      error("E046", state.tokens.curr, "yield");
    }
    state.funct["(yielded)"] = true;
    var delegatingYield = false;

    if (state.tokens.next.value === "*") {
      delegatingYield = true;
      advance("*");
    }

    if (sameLine(this, state.tokens.next)) {
      if (delegatingYield ||
          (state.tokens.next.id !== ";" && !state.option.asi &&
           !state.tokens.next.reach && state.tokens.next.nud)) {

        nobreaknonadjacent(state.tokens.curr, state.tokens.next);
        this.first = expression(context, 10);

        if (this.first.type === "(punctuator)" && this.first.value === "=" &&
            !this.first.paren && !state.option.boss) {
          warning("W093", this.first);
        }
      }
      if (state.tokens.next.id !== ")" &&
          (prev.lbp > 30 || (!prev.assign && !isEndOfExpr()))) {
        error("E050", this);
      }
    } else if (!state.option.asi) {
      nolinebreak(this); // always warn (Line breaking error)
    }
    return this;
  };

  stmt("throw", function(context) {
    nolinebreak(this);
    this.first = expression(context, 20);

    reachable(this);

    return this;
  }).exps = true;

  prefix("import", function(context) {
    var mp = metaProperty(context, "meta", function() {
      if (!state.inES11(true)) {
        warning("W119", state.tokens.prev, "import.meta", "11");
      }
      if (!state.option.module) {
        error("E070", state.tokens.prev);
      }
    });

    if (mp) {
      return mp;
    }

    if (!checkPunctuator(state.tokens.next, "(")) {
      return state.syntax["(identifier)"].nud.call(this, context);
    }

    if (!state.inES11()) {
      warning("W119", state.tokens.curr, "dynamic import", "11");
    }

    advance("(");
    expression(context, 10);
    advance(")");
    return this;
  });

  var importSymbol = stmt("import", function(context) {
    if (!state.funct["(scope)"].block.isGlobal()) {
      error("E053", state.tokens.curr, "Import");
    }

    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "import", "6");
    }

    if (state.tokens.next.type === "(string)") {
      // ModuleSpecifier :: StringLiteral
      advance("(string)");
      return this;
    }

    if (state.tokens.next.identifier) {
      // ImportClause :: ImportedDefaultBinding
      this.name = identifier(context);
      // Import bindings are immutable (see ES6 8.1.1.5.5)
      state.funct["(scope)"].addbinding(this.name, {
        type: "import",
        initialized: true,
        token: state.tokens.curr });

      if (state.tokens.next.value === ",") {
        // ImportClause :: ImportedDefaultBinding , NameSpaceImport
        // ImportClause :: ImportedDefaultBinding , NamedImports
        advance(",");
        // At this point, we intentionally fall through to continue matching
        // either NameSpaceImport or NamedImports.
        // Discussion:
        // https://github.com/jshint/jshint/pull/2144#discussion_r23978406
      } else {
        advance("from");
        advance("(string)");
        return this;
      }
    }

    if (state.tokens.next.id === "*") {
      // ImportClause :: NameSpaceImport
      advance("*");
      advance("as");
      if (state.tokens.next.identifier) {
        this.name = identifier(context);
        // Import bindings are immutable (see ES6 8.1.1.5.5)
        state.funct["(scope)"].addbinding(this.name, {
          type: "import",
          initialized: true,
          token: state.tokens.curr });
      }
    } else {
      // ImportClause :: NamedImports
      advance("{");
      for (;;) {
        if (state.tokens.next.value === "}") {
          advance("}");
          break;
        }
        var importName;
        if (peek().value === "as") {
          identifier(context, true);
          advance("as");
          importName = identifier(context);
        } else {
          importName = identifier(context);
        }

        // Import bindings are immutable (see ES6 8.1.1.5.5)
        state.funct["(scope)"].addbinding(importName, {
          type: "import",
          initialized: true,
          token: state.tokens.curr });

        if (state.tokens.next.value === ",") {
          advance(",");
        } else if (state.tokens.next.value === "}") {
          advance("}");
          break;
        } else {
          error("E024", state.tokens.next, state.tokens.next.value);
          break;
        }
      }
    }

    // FromClause
    advance("from");
    advance("(string)");

    // Support for ES2015 modules was released without warning for `import`
    // declarations that lack bindings. Issuing a warning would therefor
    // constitute a breaking change.
    // TODO: enable this warning in JSHint 3
    // if (hasBindings) {
    //   warning("W142", this, "import", moduleSpecifier);
    // }

    return this;
  });
  importSymbol.exps = true;
  importSymbol.reserved = true;
  importSymbol.meta = { isFutureReservedWord: true, es5: true };
  importSymbol.useFud = function() {
    return !(checkPunctuators(state.tokens.next, [".", "("]));
  };
  importSymbol.rbp = 161;

  stmt("export", function(context) {
    var ok = true;
    var token;
    var moduleSpecifier;
    context = context | prodParams.export;

    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "export", "6");
      ok = false;
    }

    if (!state.funct["(scope)"].block.isGlobal()) {
      error("E053", state.tokens.curr, "Export");
      ok = false;
    }

    if (state.tokens.next.value === "*") {
      // ExportDeclaration :: export * FromClause
      // ExportDeclaration :: export * as IdentifierName FromClause
      advance("*");

      if (state.tokens.next.value === "as") {
        if (!state.inES11()) {
          warning("W119", state.tokens.curr, "export * as ns from", "11");
        }
        advance("as");
        identifier(context, true);
        state.funct["(scope)"].setExported(null, state.tokens.curr);
      }

      advance("from");
      advance("(string)");
      return this;
    }

    if (state.tokens.next.type === "default") {
      // ExportDeclaration ::
      //      export default [lookahead ∉ { function, class }] AssignmentExpression[In] ;
      //      export default HoistableDeclaration
      //      export default ClassDeclaration

      // because the 'name' of a default-exported function is, confusingly, 'default'
      // see https://bocoup.com/blog/whats-in-a-function-name
      state.nameStack.set(state.tokens.next);

      advance("default");
      var def = state.tokens.curr;
      var exportType = state.tokens.next.id;
      if (exportType === "function") {
        this.block = true;
        advance("function");
        token = state.syntax["function"].fud(context);
        state.funct["(scope)"].setExported(token.name, def);
      } else if (exportType === "async" && peek().id === "function") {
        this.block = true;
        advance("async");
        advance("function");
        token = state.syntax["function"].fud(context | prodParams.preAsync);
        state.funct["(scope)"].setExported(token.name, def);
      } else if (exportType === "class") {
        this.block = true;
        advance("class");
        token = state.syntax["class"].fud(context);
        state.funct["(scope)"].setExported(token.name, def);
      } else {
        expression(context, 10);
        state.funct["(scope)"].setExported(null, def);
      }
      return this;
    }
    if (state.tokens.next.value === "{") {
      // ExportDeclaration :: export ExportClause
      advance("{");
      var exportedTokens = [];
      while (!checkPunctuator(state.tokens.next, "}")) {
        if (!state.tokens.next.identifier) {
          /* istanbul ignore next */
          error("E030", state.tokens.next, state.tokens.next.value);
        }
        advance();

        if (state.tokens.next.value === "as") {
          advance("as");
          if (!state.tokens.next.identifier) {
            /* istanbul ignore next */
            error("E030", state.tokens.next, state.tokens.next.value);
          }
          exportedTokens.push({
            local: state.tokens.prev,
            export: state.tokens.next
          });
          advance();
        } else {
          exportedTokens.push({
            local: state.tokens.curr,
            export: state.tokens.curr
          });
        }

        if (!checkPunctuator(state.tokens.next, "}")) {
          advance(",");
        }
      }
      advance("}");
      if (state.tokens.next.value === "from") {
        // ExportDeclaration :: export ExportClause FromClause
        advance("from");
        moduleSpecifier = state.tokens.next;
        advance("(string)");
      } else if (ok) {
        exportedTokens.forEach(function(x) {
          state.funct["(scope)"].setExported(x.local, x.export);
        });
      }

      if (exportedTokens.length === 0) {
        if (moduleSpecifier) {
          warning("W142", this, "export", moduleSpecifier.value);
        } else {
          warning("W141", this, "export");
        }
      }

      return this;
    } else if (state.tokens.next.id === "var") {
      // ExportDeclaration :: export VariableStatement
      advance("var");
      token = state.tokens.curr.fud(context);
      token.first.forEach(function(binding) {
        state.funct["(scope)"].setExported(binding, binding);
      });
    } else if (state.tokens.next.id === "let") {
      // ExportDeclaration :: export VariableStatement
      advance("let");
      token = state.tokens.curr.fud(context);
      token.first.forEach(function(binding) {
        state.funct["(scope)"].setExported(binding, binding);
      });
    } else if (state.tokens.next.id === "const") {
      // ExportDeclaration :: export VariableStatement
      advance("const");
      token = state.tokens.curr.fud(context);
      token.first.forEach(function(binding) {
        state.funct["(scope)"].setExported(binding, binding);
      });
    } else if (state.tokens.next.id === "function") {
      // ExportDeclaration :: export Declaration
      this.block = true;
      advance("function");
      token = state.syntax["function"].fud(context);
      state.funct["(scope)"].setExported(token.name, token.name);
    } else if (state.tokens.next.id === "async" && peek().id === "function") {
      // ExportDeclaration :: export Declaration
      this.block = true;
      advance("async");
      advance("function");
      token = state.syntax["function"].fud(context | prodParams.preAsync);
      state.funct["(scope)"].setExported(token.name, token.name);
    } else if (state.tokens.next.id === "class") {
      // ExportDeclaration :: export Declaration
      this.block = true;
      advance("class");
      token = state.syntax["class"].fud(context);
      state.funct["(scope)"].setExported(token.name, token.name);
    } else {
      /* istanbul ignore next */
      error("E024", state.tokens.next, state.tokens.next.value);
    }

    return this;
  }).exps = true;

  /**
   * Determine if SuperCall or SuperProperty may be used in the current context
   * (as described by the provided "functor" object).
   *
   * @param {string} type - one of "property" or "call"
   * @param {object} funct - a "functor" object describing the current function
   *                         context
   *
   * @returns {boolean}
   */
  function supportsSuper(type, funct) {
    if (type === "call" && funct["(async)"]) {
      return false;
    }

    if (type === "property" && funct["(method)"]) {
      return true;
    }

    if (type === "call" && funct["(statement)"] &&
      funct["(statement)"].id === "class") {
      return true;
    }

    if (funct["(arrow)"]) {
      return supportsSuper(type, funct["(context)"]);
    }

    return false;
  }

  var superNud = function() {
    var next = state.tokens.next;

    if (checkPunctuators(next, ["[", "."])) {
      if (!supportsSuper("property", state.funct)) {
        error("E063", this);
      }
    } else if (checkPunctuator(next, "(")) {
      if (!supportsSuper("call", state.funct)) {
        error("E064", this);
      }
    } else {
      error("E024", next, next.value || next.id);
    }

    return this;
  };

  // Future Reserved Words

  FutureReservedWord("abstract");
  FutureReservedWord("boolean");
  FutureReservedWord("byte");
  FutureReservedWord("char");
  FutureReservedWord("double");
  FutureReservedWord("enum", { es5: true });
  FutureReservedWord("export", { es5: true });
  FutureReservedWord("extends", { es5: true });
  FutureReservedWord("final");
  FutureReservedWord("float");
  FutureReservedWord("goto");
  FutureReservedWord("implements", { es5: true, strictOnly: true });
  FutureReservedWord("int");
  FutureReservedWord("interface", { es5: true, strictOnly: true });
  FutureReservedWord("long");
  FutureReservedWord("native");
  FutureReservedWord("package", { es5: true, strictOnly: true });
  FutureReservedWord("private", { es5: true, strictOnly: true });
  FutureReservedWord("protected", { es5: true, strictOnly: true });
  FutureReservedWord("public", { es5: true, strictOnly: true });
  FutureReservedWord("short");
  FutureReservedWord("static", { es5: true, strictOnly: true });
  FutureReservedWord("synchronized");
  FutureReservedWord("transient");
  FutureReservedWord("volatile");

  // this function is used to determine whether a squarebracket or a curlybracket
  // expression is a comprehension array, destructuring assignment or a json value.

  var lookupBlockType = function() {
    var pn, pn1, prev;
    var i = -1;
    var bracketStack = 0;
    var ret = {};
    if (checkPunctuators(state.tokens.curr, ["[", "{"])) {
      bracketStack += 1;
    }
    do {
      prev = i === -1 ? state.tokens.curr : pn;
      pn = i === -1 ? state.tokens.next : peek(i);
      pn1 = peek(i + 1);
      i = i + 1;
      if (checkPunctuators(pn, ["[", "{"])) {
        bracketStack += 1;
      } else if (checkPunctuators(pn, ["]", "}"])) {
        bracketStack -= 1;
      }
      if (bracketStack === 1 && pn.identifier && pn.value === "for" &&
          !checkPunctuator(prev, ".")) {
        ret.isCompArray = true;
        ret.notJson = true;
        break;
      }
      if (bracketStack === 0 && checkPunctuators(pn, ["}", "]"])) {
        if (pn1.value === "=") {
          ret.isDestAssign = true;
          ret.notJson = true;
          break;
        } else if (pn1.value === ".") {
          ret.notJson = true;
          break;
        }
      }
      if (checkPunctuator(pn, ";")) {
        ret.notJson = true;
      }
    } while (bracketStack > 0 && pn.id !== "(end)");
    return ret;
  };

  /**
   * Update an object used to track property names within object initializers
   * and class bodies. Produce warnings in response to duplicated names.
   *
   * @param {object} props - a collection of all properties of the object or
   *                         class to which the current property is being
   *                         assigned
   * @param {string} name - the property name
   * @param {object} tkn - the token defining the property
   * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
   *                              definition
   * @param {boolean} [isStatic] - whether the accessor is a static method
   * @param {boolean} [isComputed] - whether the property is a computed expression like [Symbol.iterator]
   */
  function saveProperty(props, name, tkn, isClass, isStatic, isComputed) {
    if (tkn.identifier) {
      name = tkn.value;
    }
    var key = name;
    if (isClass && isStatic) {
      key = "static " + name;
    }

    if (props[key] && name !== "__proto__" && !isComputed) {
      var msg = ["key", "class method", "static class method"];
      msg = msg[(isClass || false) + (isStatic || false)];
      warning("W075", state.tokens.next, msg, name);
    } else {
      props[key] = Object.create(null);
    }

    props[key].basic = true;
    props[key].basictkn = tkn;
  }

  /**
   * Update an object used to track property names within object initializers
   * and class bodies. Produce warnings in response to duplicated names.
   *
   * @param {string} accessorType - Either "get" or "set"
   * @param {object} props - a collection of all properties of the object or
   *                         class to which the current accessor is being
   *                         assigned
   * @param {object} tkn - the identifier token representing the accessor name
   * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
   *                              definition
   * @param {boolean} [isStatic] - whether the accessor is a static method
   */
  function saveAccessor(accessorType, props, name, tkn, isClass, isStatic) {
    var flagName = accessorType === "get" ? "getterToken" : "setterToken";
    var key = name;
    state.tokens.curr.accessorType = accessorType;
    state.nameStack.set(tkn);
    if (isClass && isStatic) {
      key = "static " + name;
    }

    if (props[key]) {
      if ((props[key].basic || props[key][flagName]) && name !== "__proto__") {
        var msg = "";
        if (isClass) {
          if (isStatic) {
            msg += "static ";
          }
          msg += accessorType + "ter method";
        } else {
          msg = "key";
        }
        warning("W075", state.tokens.next, msg, name);
      }
    } else {
      props[key] = Object.create(null);
    }

    props[key][flagName] = tkn;
    if (isStatic) {
      props[key].static = true;
    }
  }

  /**
   * Parse a computed property name within object initializers and class bodies
   * as introduced by ES2015. For example:
   *
   *     void {
   *       [object.method()]: null
   *     };
   *
   * @param {number} context - the parsing context
   *
   * @returns {object} - the token value that describes the expression which
   *                     defines the property name
   */
  function computedPropertyName(context) {
    advance("[");

    // Explicitly reclassify token as a delimeter to prevent its later
    // interpretation as an "infix" operator.
    state.tokens.curr.delim = true;
    state.tokens.curr.lbp = 0;

    if (!state.inES6()) {
      warning("W119", state.tokens.curr, "computed property names", "6");
    }
    var value = expression(context & ~prodParams.noin, 10);
    advance("]");
    return value;
  }

  /**
   * Test whether a given token is a punctuator whose `value` property matches
   * one of the specified values. This function explicitly verifies the token's
   * `type` property so that like-valued string literals (e.g. `";"`) do not
   * produce false positives.
   *
   * @param {Token} token
   * @param {Array.<string>} values
   *
   * @returns {boolean}
   */
  function checkPunctuators(token, values) {
    if (token.type === "(punctuator)") {
      return _.includes(values, token.value);
    }
    return false;
  }

  /**
   * Test whether a given token is a punctuator whose `value` property matches
   * the specified value. This function explicitly verifies the token's `type`
   * property so that like-valued string literals (e.g. `";"`) do not produce
   * false positives.
   *
   * @param {Token} token
   * @param {string} value
   *
   * @returns {boolean}
   */
  function checkPunctuator(token, value) {
    return token.type === "(punctuator)" && token.value === value;
  }

  // Check whether this function has been reached for a destructuring assign with undeclared values
  function destructuringAssignOrJsonValue(context) {
    // lookup for the assignment (ECMAScript 6 only)
    // if it has semicolons, it is a block, so go parse it as a block
    // or it's not a block, but there are assignments, check for undeclared variables

    var block = lookupBlockType();
    if (block.notJson) {
      if (!state.inES6() && block.isDestAssign) {
        /* istanbul ignore next */
        warning("W104", state.tokens.curr, "destructuring assignment", "6");
      }
      statements(context);
    // otherwise parse json value
    } else {
      state.option.laxbreak = true;
      state.jsonMode = true;
      jsonValue();
    }
  }

  /**
   * Parse and define the three states of a list comprehension in order to
   * avoid defining global variables, but keeping them to the list
   * comprehension scope only. The order of the states are as follows:
   *
   * - "use" - which will be the returned iterative part of the list
   *   comprehension
   * - "define" - which will define the variables local to the list
   *   comprehension
   * - "filter" - which will help filter out values
   */
  var arrayComprehension = function() {
    var CompArray = function() {
      this.mode = "use";
      this.variables = [];
    };
    var _carrays = [];
    var _current;
    function declare(v) {
      var l = _current.variables.filter(function(elt) {
        // if it has, change its undef state
        if (elt.value === v) {
          elt.undef = false;
          return v;
        }
      }).length;
      return l !== 0;
    }
    function use(v) {
      var l = _current.variables.filter(function(elt) {
        // and if it has been defined
        if (elt.value === v && !elt.undef) {
          if (elt.unused === true) {
            elt.unused = false;
          }
          return v;
        }
      }).length;
      // otherwise we warn about it
      return (l === 0);
    }
    return { stack: function() {
          _current = new CompArray();
          _carrays.push(_current);
        },
        unstack: function() {
          _current.variables.filter(function(v) {
            if (v.unused)
              warning("W098", v.token, v.token.raw_text || v.value);
            if (v.undef)
              state.funct["(scope)"].block.use(v.value, v.token);
          });
          _carrays.splice(-1, 1);
          _current = _carrays[_carrays.length - 1];
        },
        setState: function(s) {
          if (_.includes(["use", "define", "generate", "filter"], s))
            _current.mode = s;
        },
        check: function(v) {
          if (!_current) {
            return;
          }
          // When we are in "use" state of the list comp, we enqueue that var
          if (_current && _current.mode === "use") {
            if (use(v)) {
              _current.variables.push({
                token: state.tokens.curr,
                value: v,
                undef: true,
                unused: false
              });
            }
            return true;
          // When we are in "define" state of the list comp,
          } else if (_current && _current.mode === "define") {
            // check if the variable has been used previously
            if (!declare(v)) {
              _current.variables.push({
                token: state.tokens.curr,
                value: v,
                undef: false,
                unused: true
              });
            }
            return true;
          // When we are in the "generate" state of the list comp,
          } else if (_current && _current.mode === "generate") {
            state.funct["(scope)"].block.use(v, state.tokens.curr);
            return true;
          // When we are in "filter" state,
          } else if (_current && _current.mode === "filter") {
            // we check whether current variable has been declared
            if (use(v)) {
              // if not we warn about it
              /* istanbul ignore next */
              state.funct["(scope)"].block.use(v, state.tokens.curr);
            }
            return true;
          }
          /* istanbul ignore next */
          return false;
        }
        };
  };


  /**
   * Parse input according to the JSON format.
   *
   * http://json.org/
   */
  function jsonValue() {
    function jsonObject() {
      var o = {}, t = state.tokens.next;
      advance("{");
      if (state.tokens.next.id !== "}") {
        for (;;) {
          if (state.tokens.next.id === "(end)") {
            error("E026", state.tokens.next, t.line);
          } else if (state.tokens.next.id === "}") {
            warning("W094", state.tokens.curr);
            break;
          } else if (state.tokens.next.id === ",") {
            error("E028", state.tokens.next);
          } else if (state.tokens.next.id !== "(string)") {
            warning("W095", state.tokens.next, state.tokens.next.value);
          }
          if (o[state.tokens.next.value] === true) {
            warning("W075", state.tokens.next, "key", state.tokens.next.value);
          } else if ((state.tokens.next.value === "__proto__" &&
            !state.option.proto) || (state.tokens.next.value === "__iterator__" &&
            !state.option.iterator)) {
            warning("W096", state.tokens.next, state.tokens.next.value);
          } else {
            o[state.tokens.next.value] = true;
          }
          advance();
          advance(":");
          jsonValue();
          if (state.tokens.next.id !== ",") {
            break;
          }
          advance(",");
        }
      }
      advance("}");
    }

    function jsonArray() {
      var t = state.tokens.next;
      advance("[");
      if (state.tokens.next.id !== "]") {
        for (;;) {
          if (state.tokens.next.id === "(end)") {
            error("E027", state.tokens.next, t.line);
          } else if (state.tokens.next.id === "]") {
            warning("W094", state.tokens.curr);
            break;
          } else if (state.tokens.next.id === ",") {
            error("E028", state.tokens.next);
          }
          jsonValue();
          if (state.tokens.next.id !== ",") {
            break;
          }
          advance(",");
        }
      }
      advance("]");
    }

    switch (state.tokens.next.id) {
    case "{":
      jsonObject();
      break;
    case "[":
      jsonArray();
      break;
    case "true":
    case "false":
    case "null":
    case "(number)":
    case "(string)":
      advance();
      break;
    case "-":
      advance("-");
      advance("(number)");
      break;
    default:
      error("E003", state.tokens.next);
    }
  }

  /**
   * Lint dynamically-evaluated code, appending any resulting errors/warnings
   * into the global `errors` array.
   *
   * @param {array} internals - collection of "internals" objects describing
   *                            string tokens that contain evaluated code
   * @param {object} options - linting options to apply
   * @param {object} globals - globally-defined bindings for the evaluated code
   */
  function lintEvalCode(internals, options, globals) {
    var priorErrorCount, idx, jdx, internal;

    for (idx = 0; idx < internals.length; idx += 1) {
      internal = internals[idx];
      options.scope = internal.elem;
      priorErrorCount = JSHINT.errors.length;

      itself(internal.code, options, globals);

      for (jdx = priorErrorCount; jdx < JSHINT.errors.length; jdx += 1) {
        JSHINT.errors[jdx].line += internal.token.line - 1;
      }
    }
  }

  var escapeRegex = function(str) {
    return str.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
  };

  // The actual JSHINT function itself.
  var itself = function(s, o, g) {
    var x, reIgnoreStr, reIgnore;
    var optionKeys, newOptionObj, newIgnoredObj;

    o = _.clone(o);
    state.reset();
    newOptionObj = state.option;
    newIgnoredObj = state.ignored;

    if (o && o.scope) {
      JSHINT.scope = o.scope;
    } else {
      JSHINT.errors = [];
      JSHINT.internals = [];
      JSHINT.blacklist = {};
      JSHINT.scope = "(main)";
    }

    predefined = Object.create(null);
    combine(predefined, vars.ecmaIdentifiers[3]);
    combine(predefined, vars.reservedVars);

    declared = Object.create(null);
    var exported = Object.create(null); // Variables that live outside the current file

    function each(obj, cb) {
      if (!obj)
        return;

      if (!Array.isArray(obj) && typeof obj === "object")
        obj = Object.keys(obj);

      obj.forEach(cb);
    }

    if (o) {

      each([o.predef, o.globals], function(dict) {
        each(dict, function(item) {
          var slice, prop;

          if (item[0] === "-") {
            slice = item.slice(1);
            JSHINT.blacklist[slice] = slice;
            // remove from predefined if there
            delete predefined[slice];
          } else {
            prop = Object.getOwnPropertyDescriptor(dict, item);
            predefined[item] = prop ? prop.value : false;
          }
        });
      });

      each(o.exported || null, function(item) {
        exported[item] = true;
      });

      delete o.predef;
      delete o.exported;

      optionKeys = Object.keys(o);
      for (x = 0; x < optionKeys.length; x++) {
        if (/^-W\d{3}$/g.test(optionKeys[x])) {
          newIgnoredObj[optionKeys[x].slice(1)] = true;
        } else {
          var optionKey = optionKeys[x];
          newOptionObj[optionKey] = o[optionKey];
        }
      }
    }

    state.option = newOptionObj;
    state.ignored = newIgnoredObj;

    state.option.indent = state.option.indent || 4;
    state.option.maxerr = state.option.maxerr || 50;

    indent = 1;

    var scopeManagerInst = scopeManager(state, predefined, exported, declared);
    scopeManagerInst.on("warning", function(ev) {
      warning.apply(null, [ ev.code, ev.token].concat(ev.data));
    });

    scopeManagerInst.on("error", function(ev) {
      /* istanbul ignore next */
      error.apply(null, [ ev.code, ev.token ].concat(ev.data));
    });

    state.funct = functor("(global)", null, {
      "(global)"    : true,
      "(scope)"     : scopeManagerInst,
      "(comparray)" : arrayComprehension(),
      "(metrics)"   : createMetrics(state.tokens.next)
    });

    functions = [state.funct];
    member = {};
    membersOnly = null;
    inblock = false;
    lookahead = [];

    if (!isString(s) && !Array.isArray(s)) {
      errorAt("E004", 0);
      return false;
    }

    api = {
      get isJSON() {
        /* istanbul ignore next */
        return state.jsonMode;
      },

      getOption: function(name) {
        return state.option[name] || null;
      },

      getCache: function(name) {
        return state.cache[name];
      },

      setCache: function(name, value) {
        state.cache[name] = value;
      },

      warn: function(code, data) {
        warningAt.apply(null, [ code, data.line, data.char ].concat(data.data));
      },

      on: function(names, listener) {
        names.split(" ").forEach(function(name) {
          emitter.on(name, listener);
        }.bind(this));
      }
    };

    emitter.removeAllListeners();
    (extraModules || []).forEach(function(func) {
      func(api);
    });

    state.tokens.prev = state.tokens.curr = state.tokens.next = state.syntax["(begin)"];
    if (o && o.ignoreDelimiters) {

      if (!Array.isArray(o.ignoreDelimiters)) {
        /* istanbul ignore next */
        o.ignoreDelimiters = [o.ignoreDelimiters];
      }

      o.ignoreDelimiters.forEach(function(delimiterPair) {
        if (!delimiterPair.start || !delimiterPair.end)
            return;

        reIgnoreStr = escapeRegex(delimiterPair.start) +
                      "[\\s\\S]*?" +
                      escapeRegex(delimiterPair.end);

        reIgnore = new RegExp(reIgnoreStr, "ig");

        s = s.replace(reIgnore, function(match) {
          return match.replace(/./g, " ");
        });
      });
    }

    lex = new Lexer(s);

    lex.on("warning", function(ev) {
      warningAt.apply(null, [ ev.code, ev.line, ev.character].concat(ev.data));
    });

    lex.on("error", function(ev) {
      errorAt.apply(null, [ ev.code, ev.line, ev.character ].concat(ev.data));
    });

    lex.on("fatal", function(ev) {
      quit("E041", ev);
    });

    lex.on("Identifier", function(ev) {
      emitter.emit("Identifier", ev);
    });

    lex.on("String", function(ev) {
      emitter.emit("String", ev);
    });

    lex.on("Number", function(ev) {
      emitter.emit("Number", ev);
    });

    // Check options
    var name;
    for (name in o) {
      if (_.has(o, name)) {
        checkOption(name, true, state.tokens.curr);
      }
    }
    if (o) {
      for (name in o.unstable) {
        if (_.has(o.unstable, name)) {
          checkOption(name, false, state.tokens.curr);
        }
      }
    }

    try {
      applyOptions();

      // combine the passed globals after we've assumed all our options
      combine(predefined, g || {});

      //reset values
      checkComma.first = true;

      advance();
      switch (state.tokens.next.id) {
      case "{":
      case "[":
        destructuringAssignOrJsonValue(0);
        break;
      default:
        directives();

        if (state.directive["use strict"]) {
          if (!state.allowsGlobalUsd()) {
            warning("W097", state.directive["use strict"]);
          }
        }

        statements(0);
      }

      if (state.tokens.next.id !== "(end)") {
        quit("E041", state.tokens.curr);
      }

      state.funct["(scope)"].unstack();

    } catch (err) {
      if (err && err.name === "JSHintError") {
        var nt = state.tokens.next || {};
        JSHINT.errors.push({
          scope     : "(main)",
          raw       : err.raw,
          code      : err.code,
          reason    : err.reason,
          line      : err.line || nt.line,
          character : err.character || nt.from
        });
      } else {
        /* istanbul ignore next */
        throw err;
      }
    }

    // Loop over the listed "internals", and check them as well.
    if (JSHINT.scope === "(main)") {
      lintEvalCode(JSHINT.internals, o || {}, g);
    }

    return JSHINT.errors.length === 0;
  };

  // Modules.
  itself.addModule = function(func) {
    extraModules.push(func);
  };

  itself.addModule(style.register);

  // Data summary.
  itself.data = function() {
    var data = {
      functions: [],
      options: state.option
    };

    var fu, f, i, n, globals;

    if (itself.errors.length) {
      data.errors = itself.errors;
    }

    if (state.jsonMode) {
      /* istanbul ignore next */
      data.json = true;
    }

    var impliedGlobals = state.funct["(scope)"].getImpliedGlobals();
    if (impliedGlobals.length > 0) {
      data.implieds = impliedGlobals;
    }

    globals = state.funct["(scope)"].getUsedOrDefinedGlobals();
    if (globals.length > 0) {
      data.globals = globals;
    }

    for (i = 1; i < functions.length; i += 1) {
      f = functions[i];
      fu = {};

      fu.name = f["(name)"];
      fu.param = f["(params)"];
      fu.line = f["(line)"];
      fu.character = f["(character)"];
      fu.last = f["(last)"];
      fu.lastcharacter = f["(lastcharacter)"];

      fu.metrics = {
        complexity: f["(metrics)"].ComplexityCount,
        parameters: f["(metrics)"].arity,
        statements: f["(metrics)"].statementCount
      };

      data.functions.push(fu);
    }

    var unuseds = state.funct["(scope)"].getUnuseds();
    if (unuseds.length > 0) {
      data.unused = unuseds;
    }

    for (n in member) {
      if (typeof member[n] === "number") {
        data.member = member;
        break;
      }
    }

    return data;
  };

  itself.jshint = itself;

  return itself;
}());

// Make JSHINT a Node module, if possible.
if (typeof exports === "object" && exports) {
  exports.JSHINT = JSHINT;
}

},{"./lex.js":17,"./messages.js":18,"./options.js":20,"./prod-params.js":21,"./reg.js":22,"./scope-manager.js":23,"./state.js":24,"./style.js":25,"./vars.js":27,"console-browserify":9,"events":11,"lodash":12}]},{},[]);

JSHINT = require('jshint').JSHINT;
if (typeof exports === 'object' && exports) exports.JSHINT = JSHINT;
}());