Add ESLint support

[RobLoach]

ESLint is an alternative to JSHint. This is just a rough start, feel free to add more.

References: #259

[nkbt]

I reckon these things trigger errors, when you are trying to do var $ = require('jquery') (fails because you are trying to re-define global $). So I usually keep all 3rd party libs as false even when I actually have them.

[RobLoach]

Should we just remove the env key entirely?

[goatslacker]

we can leave env with browser and node.

[hshoff]

Let's leave browser and node

[hshoff]

LGTM after the change to env. Thanks for this @RobLoach!

[nkbt]

I've just realized (when pasted to my .eslintrc), that this is some funky non-json format. I would expect it to be something like this instead:

{
  "env": {
    "browser": true,
    "node": true
  },

  "rules": {
    "no-new-object": 2,
    "no-reserved-keys": 2,
    "no-array-constructor": 2,
    "quotes": [2, "single"],
    "indent": [2, 2],
    "no-multi-str": 2,
    "no-multi-spaces": 2,
    "no-shadow-restricted-names": 2,
    "dot-notation": 2,
    "block-scoped-var": 2,
    "vars-on-top": 2,
    "no-unused-vars": 2,
    "eqeqeq": 2,
    "use-isnan": 2,
    "no-eq-null": 2,
    "brace-style": 2,
    "spaced-line-comment": 2,
    "valid-jsdoc": 2,
    "space-infix-ops": 2,
    "eol-last": 2,
    "padded-blocks": [2, "never"],
    "space-before-blocks": 2,
    "comma-dangle": [2, "never"],
    "comma-style": 2,
    "semi": [2, "always"],
    "semi-spacing": 2,
    "no-extra-boolean-cast": 2,
    "space-before-function-paren": [2, "never"],
    "no-spaced-func": 2,
    "no-wrap-func": 2,
    "camelcase": 2,
    "new-cap": 2,
    "consistent-this": [1, "_this"],
    "func-names": 2,
    "key-spacing": 2,
    "no-dupe-keys": 2,
    "strict": 2,
  }
}

[nkbt]

Missing:
"one-var": [2, "never"],

[RobLoach]

I've just realized (when pasted to my .eslintrc), that this is some funky non-json format. I would expect it to be something like this instead:

ESLint supports either YAML (via js-yaml), or JSON. Both formats produce the same result.

Missing:
"one-var": [2, "never"],

Added one-var in there, thanks for the note 👍 .

[hshoff]

👏