fix: airbnb + prettier lint; and update tests

.eslintignore

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+CHANGELOG.md
+README.md
+*.d.ts
+recipes
+patches
+
+test-legacy
+*.js.snap
+*.tsbuildinfo
+.cache
+.*cache
+*.cache
+
+# TODO: lint
+example
+benchmark
+
+# Build environment
+dist
+
+# Package managers lockfiles
+package-lock.json
+shrinkwrap.json
+pnpm-lock.json
+
+# Logs
+logs
+*.log
+*~
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next

.eslintrc.js

@@ -0,0 +1,176 @@
+'use strict';
+
+const airbnbBase = require('eslint-config-airbnb-base');
+
+// eslint-disable-next-line import/no-dynamic-require
+const bestPractices = require(airbnbBase.extends[0]);
+
+const ignoredProps = bestPractices.rules[
+  'no-param-reassign'
+][1].ignorePropertyModificationsFor.concat(
+  'err',
+  'x',
+  '_',
+  'opts',
+  'options',
+  'settings',
+  'config',
+  'cfg',
+);
+
+// Additional rules that are specific and overiding previous
+const additionalChanges = {
+  strict: 'off',
+
+  // Enforce using named functions when regular function is used,
+  // otherwise use arrow functions
+  'func-names': ['error', 'always'],
+  // Always use parens (for consistency).
+  // https://eslint.org/docs/rules/arrow-parens
+  'arrow-parens': ['error', 'always', { requireForBlockBody: true }],
+  'prefer-arrow-callback': [
+    'error',
+    { allowNamedFunctions: true, allowUnboundThis: true },
+  ],
+  // http://eslint.org/docs/rules/max-params
+  'max-params': ['error', { max: 3 }],
+  // http://eslint.org/docs/rules/max-statements
+  'max-statements': ['error', { max: 20 }],
+  // http://eslint.org/docs/rules/max-statements-per-line
+  'max-statements-per-line': ['error', { max: 1 }],
+  // http://eslint.org/docs/rules/max-nested-callbacks
+  'max-nested-callbacks': ['error', { max: 4 }],
+  // http://eslint.org/docs/rules/max-depth
+  'max-depth': ['error', { max: 4 }],
+  // enforces no braces where they can be omitted
+  // https://eslint.org/docs/rules/arrow-body-style
+  // Never enable for object literal.
+  'arrow-body-style': [
+    'error',
+    'as-needed',
+    { requireReturnForObjectLiteral: false },
+  ],
+  // Allow functions to be use before define because:
+  // 1) they are hoisted,
+  // 2) because ensure read flow is from top to bottom
+  // 3) logically order of the code.
+  // 4) the only addition is 'typedefs' option, see overrides for TS files
+  'no-use-before-define': [
+    'error',
+    {
+      functions: false,
+      classes: true,
+      variables: true,
+    },
+  ],
+  // Same as AirBnB, but adds `opts`, `options`, `x` and `err` to exclusions!
+  // disallow reassignment of function parameters
+  // disallow parameter object manipulation except for specific exclusions
+  // rule: https://eslint.org/docs/rules/no-param-reassign.html
+  'no-param-reassign': [
+    'error',
+    {
+      props: true,
+      ignorePropertyModificationsFor: ignoredProps,
+    },
+  ],
+
+  // disallow declaration of variables that are not used in the code
+  'no-unused-vars': [
+    'error',
+    {
+      ignoreRestSiblings: true, // airbnb's default
+      vars: 'all', // airbnb's default
+      varsIgnorePattern: '^(?:$$|xx|_|__|[iI]gnor(?:e|ing|ed))',
+      args: 'after-used', // airbnb's default
+      argsIgnorePattern: '^(?:$$|xx|_|__|[iI]gnor(?:e|ing|ed))',
+
+      // catch blocks are handled by Unicorns
+      caughtErrors: 'none',
+      // caughtErrorsIgnorePattern: '^(?:$$|xx|_|__|[iI]gnor(?:e|ing|ed))',
+    },
+  ],
+};
+
+const importRules = {
+  'import/namespace': ['error', { allowComputed: true }],
+  'import/no-absolute-path': 'error',
+  'import/no-webpack-loader-syntax': 'error',
+  'import/no-self-import': 'error',
+
+  // Enable this sometime in the future when Node.js has ES2015 module support
+  // 'import/no-cycle': 'error',
+
+  // Disabled as it doesn't work with TypeScript
+  // 'import/newline-after-import': 'error',
+
+  'import/no-amd': 'error',
+  'import/no-duplicates': 'error',
+
+  // Enable this sometime in the future when Node.js has ES2015 module support
+  // 'import/unambiguous': 'error',
+
+  // Enable this sometime in the future when Node.js has ES2015 module support
+  // 'import/no-commonjs': 'error',
+
+  // Looks useful, but too unstable at the moment
+  // 'import/no-deprecated': 'error',
+
+  'import/no-extraneous-dependencies': 'off',
+  'import/no-mutable-exports': 'error',
+  'import/no-named-as-default-member': 'error',
+  'import/no-named-as-default': 'error',
+
+  // Disabled because it's buggy and it also doesn't work with TypeScript
+  // 'import/no-unresolved': [
+  // 	'error',
+  // 	{
+  // 		commonjs: true
+  // 	}
+  // ],
+
+  'import/order': 'error',
+  'import/no-unassigned-import': [
+    'error',
+    { allow: ['@babel/polyfill', '@babel/register'] },
+  ],
+
+  'import/prefer-default-export': 'off',
+
+  // Ensure more web-compat
+  // ! note that it doesn't work in CommonJS
+  // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/extensions.md
+  'import/extensions': 'off',
+
+  // ? Always use named exports. Enable?
+  // 'import/no-default-export': 'error',
+
+  // ? enable?
+  'import/exports-last': 'off',
+
+  // todo: Enable in future.
+  // Ensures everything is tested (all exports should be used).
+  // For cases when you don't want or can't test, add eslint-ignore comment!
+  // see: https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unused-modules.md
+  'import/no-unused-modules': 'off',
+
+  'import/no-useless-path-segments': ['error', { noUselessIndex: false }],
+};
+
+module.exports = {
+  env: {
+    es6: true,
+    es2020: true,
+    jest: true,
+    node: true,
+    commonjs: true,
+  },
+  extends: ['eslint:recommended', 'airbnb-base', 'plugin:prettier/recommended'],
+  plugins: ['prettier'],
+  rules: {
+    'prettier/prettier': 'error',
+
+    ...additionalChanges,
+    ...importRules,
+  },
+};

.prettierignore

@@ -0,0 +1,97 @@
+CHANGELOG.md
+LICENSE
+LICENSE.md
+LICENSE*.md
+dist
+# fixture
+# fixtures
+# __fixture__
+# __fixtures__
+.gitkeep
+*.map
+*.lock
+.npmrc
+.yarnrc
+*.js.snap
+coverage
+*.ico
+*.png
+*.svg
+*.jpeg
+*.jpg
+
+.*
+!.*rc.js
+!.verb*.md
+patches
+**/static/**/*.css
+
+*.tsbuildinfo
+.cache
+.*cache
+*.cache
+
+# Package managers lockfiles
+package-lock.json
+shrinkwrap.json
+pnpm-lock.json
+
+# Logs
+logs
+*.log
+*~
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next

.prettierrc.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = require( '@tunnckocore/prettier-config');