ESLint Configuration, based on Airbnb JavaScript Standard, but with some customization

.eslintrc.yml

env:
  es6: true
  node: true
parserOptions:
  ecmaFeatures:
    experimentalObjectRestSpread: true
    generators: false
    objectLiteralDuplicateProperties: false
  ecmaVersion: 6
  sourceType: module
plugins:
  - import
rules:
  accessor-pairs: 'off'
  array-bracket-spacing:
    - error
    - never
  array-callback-return: error
  arrow-body-style:
    - error
    - as-needed
    - requireReturnForObjectLiteral: false
  arrow-parens:
    - error
    - as-needed
    - requireForBlockBody: true
  arrow-spacing:
    - error
    - after: true
      before: true
  block-scoped-var: error
  block-spacing:
    - error
    - always
  brace-style:
    - error
    - 1tbs
    - allowSingleLine: true
  callback-return: 'off'
  camelcase:
    - error
    - properties: never
  capitalized-comments:
    - 'off'
    - never
    - block:
        ignoreConsecutiveComments: true
        ignoreInlineComments: true
        ignorePattern: .*
      line:
        ignoreConsecutiveComments: true
        ignoreInlineComments: true
        ignorePattern: .*
  class-methods-use-this:
    - error
    - exceptMethods: []
  comma-dangle: 'off'
  comma-spacing:
    - error
    - after: true
      before: false
  comma-style:
    - error
    - last
  complexity:
    - 'off'
    - 11
  computed-property-spacing:
    - error
    - never
  consistent-return: error
  consistent-this: 'off'
  constructor-super: error
  curly:
    - error
    - multi-line
  default-case:
    - error
    - commentPattern: ^no default$
  dot-location:
    - error
    - property
  dot-notation:
    - error
    - allowKeywords: true
  eol-last:
    - error
    - always
  eqeqeq:
    - error
    - always
    - 'null': ignore
  func-call-spacing:
    - error
    - never
  func-name-matching:
    - 'off'
    - always
    - includeCommonJSModuleExports: false
  func-names:
    - 'warn'
    - 'as-needed'
  func-style:
    - 'off'
    - expression
  generator-star-spacing:
    - error
    - after: true
      before: false
  global-require: 'off'
  guard-for-in: error
  handle-callback-err: 'off'
  id-blacklist: 'off'
  id-length: 'off'
  id-match: 'off'
  import/default: 'off'
  import/export: error
  import/extensions:
    - error
    - always
    - js: never
      jsx: never
  import/first:
    - error
    - absolute-first
  import/imports-first: 'off'
  import/max-dependencies:
    - 'off'
    - max: 10
  import/named: 'off'
  import/namespace: 'off'
  import/newline-after-import: error
  import/no-absolute-path: error
  import/no-amd: error
  import/no-commonjs: 'off'
  import/no-deprecated: 'off'
  import/no-duplicates: error
  import/no-dynamic-require: error
  import/no-extraneous-dependencies:
    - error
    - devDependencies:
        - test/**
        - tests/**
        - spec/**
        - '**/__tests__/**'
        - test.js
        - test-*.js
        - '**/*.test.js'
        - '**/*.spec.js'
        - '**/webpack.config.js'
        - '**/webpack.config.*.js'
        - '**/rollup.config.js'
        - '**/gulpfile.js'
        - '**/gulpfile.*.js'
        - '**/Gruntfile'
      optionalDependencies: false
  import/no-internal-modules:
    - 'off'
    - allow: []
  import/no-mutable-exports: error
  import/no-named-as-default: error
  import/no-named-as-default-member: error
  import/no-named-default: error
  import/no-namespace: 'off'
  import/no-nodejs-modules: 'off'
  import/no-restricted-paths: 'off'
  import/no-unassigned-import: 'off'
  import/no-unresolved:
    - error
    - caseSensitive: true
      commonjs: true
  import/no-webpack-loader-syntax: error
  import/order:
    - 'off'
    - groups:
        - builtin
        - external
        - internal
        - parent
        - sibling
        - index
      newlines-between: never
  import/prefer-default-export: error
  import/unambiguous: 'off'
  indent:
    - error
    - 4
    - FunctionDeclaration:
        body: 1
        parameters: 1
      FunctionExpression:
        body: 1
        parameters: 1
      SwitchCase: 1
      VariableDeclarator: 1
      outerIIFEBody: 1
  init-declarations: 'off'
  jsx-quotes:
    - 'off'
    - prefer-double
  key-spacing:
    - error
    - afterColon: true
      beforeColon: false
  keyword-spacing:
    - error
    - after: true
      before: true
      overrides:
        case:
          after: true
        return:
          after: true
        throw:
          after: true
  line-comment-position:
    - 'off'
    - applyDefaultPatterns: true
      ignorePattern: ''
      position: above
  linebreak-style:
    - error
    - unix
  lines-around-comment: 'off'
  lines-around-directive:
    - error
    - after: always
      before: always
  max-depth:
    - 'off'
    - 4
  max-len:
    - error
    - 100
    - 2
    - ignoreComments: false
      ignoreRegExpLiterals: true
      ignoreStrings: true
      ignoreTemplateLiterals: true
      ignoreUrls: true
  max-lines:
    - 'off'
    - max: 300
      skipBlankLines: true
      skipComments: true
  max-nested-callbacks: 'off'
  max-params:
    - 'off'
    - 3
  max-statements:
    - 'off'
    - 10
  max-statements-per-line:
    - 'off'
    - max: 1
  multiline-ternary:
    - 'off'
    - never
  new-cap:
    - error
    - capIsNew: false
      capIsNewExceptions:
        - Immutable.Map
        - Immutable.Set
        - Immutable.List
      newIsCap: true
      newIsCapExceptions: []
  new-parens: error
  newline-after-var: 'off'
  newline-before-return: 'off'
  newline-per-chained-call:
    - error
    - ignoreChainWithDepth: 4
  no-alert: warn
  no-array-constructor: error
  no-await-in-loop: error
  no-bitwise: error
  no-caller: error
  no-case-declarations: error
  no-catch-shadow: 'off'
  no-class-assign: error
  no-compare-neg-zero: 'off'
  no-cond-assign:
    - error
    - always
  no-confusing-arrow:
    - error
    - allowParens: true
  no-console: warn
  no-const-assign: error
  no-constant-condition: warn
  no-continue: error
  no-control-regex: error
  no-debugger: error
  no-delete-var: error
  no-div-regex: 'off'
  no-dupe-args: error
  no-dupe-class-members: error
  no-dupe-keys: error
  no-duplicate-case: error
  no-duplicate-imports: 'off'
  no-else-return: error
  no-empty: error
  no-empty-character-class: error
  no-empty-function:
    - error
    - allow:
        - arrowFunctions
        - functions
        - methods
  no-empty-pattern: error
  no-eq-null: 'off'
  no-eval: error
  no-ex-assign: error
  no-extend-native: error
  no-extra-bind: error
  no-extra-boolean-cast: error
  no-extra-label: error
  no-extra-parens:
    - 'off'
    - all
    - conditionalAssign: true
      nestedBinaryExpressions: false
      returnAssign: false
  no-extra-semi: error
  no-fallthrough: error
  no-floating-decimal: error
  no-func-assign: error
  no-global-assign:
    - error
    - exceptions: []
  no-implicit-coercion:
    - 'off'
    - allow: []
      boolean: false
      number: true
      string: true
  no-implicit-globals: 'off'
  no-implied-eval: error
  no-inline-comments: 'off'
  no-inner-declarations: error
  no-invalid-regexp: error
  no-invalid-this: 'off'
  no-irregular-whitespace: error
  no-iterator: error
  no-label-var: error
  no-labels:
    - error
    - allowLoop: false
      allowSwitch: false
  no-lone-blocks: error
  no-lonely-if: error
  no-loop-func: error
  no-magic-numbers:
    - 'off'
    - detectObjects: false
      enforceConst: true
      ignore: []
      ignoreArrayIndexes: true
  no-mixed-operators:
    - error
    - allowSamePrecedence: false
      groups:
        - - +
          - '-'
          - '*'
          - /
          - '%'
          - '**'
        - - '&'
          - '|'
          - ^
          - '~'
          - '<<'
          - '>>'
          - '>>>'
        - - ==
          - '!='
          - ===
          - '!=='
          - '>'
          - '>='
          - <
          - <=
        - - '&&'
          - '||'
        - - in
          - instanceof
  no-mixed-requires:
    - 'off'
    - false
  no-mixed-spaces-and-tabs: error
  no-multi-assign:
    - error
  no-multi-spaces: error
  no-multi-str: error
  no-multiple-empty-lines:
    - error
    - max: 2
      maxEOF: 1
  no-native-reassign: 'off'
  no-negated-condition: 'off'
  no-negated-in-lhs: 'off'
  no-nested-ternary: error
  no-new: error
  no-new-func: error
  no-new-object: error
  no-new-require: error
  no-new-symbol: error
  no-new-wrappers: error
  no-obj-calls: error
  no-octal: error
  no-octal-escape: error
  no-param-reassign: 'off'
  no-path-concat: 'off'
  no-plusplus: error
  no-process-env: 'off'
  no-process-exit: 'off'
  no-proto: error
  no-prototype-builtins: error
  no-redeclare: error
  no-regex-spaces: error
  no-restricted-globals: 'off'
  no-restricted-imports: 'off'
  no-restricted-modules: 'off'
  no-restricted-properties:
    - error
    - message: arguments.callee is deprecated
      object: arguments
      property: callee
    - message: Please use Object.defineProperty instead.
      property: __defineGetter__
    - message: Please use Object.defineProperty instead.
      property: __defineSetter__
    - message: Use the exponentiation operator (**) instead.
      object: Math
      property: pow
  no-restricted-syntax:
    - error
    - ForInStatement
    - ForOfStatement
    - LabeledStatement
    - WithStatement
  no-return-assign: error
  no-return-await: error
  no-script-url: error
  no-self-assign: error
  no-self-compare: error
  no-sequences: error
  no-shadow: error
  no-shadow-restricted-names: error
  no-spaced-func: error
  no-sparse-arrays: error
  no-sync: 'off'
  no-tabs: error
  no-template-curly-in-string: error
  no-ternary: 'off'
  no-this-before-super: error
  no-throw-literal: error
  no-trailing-spaces: error
  no-undef: error
  no-undef-init: error
  no-undefined: 'off'
  no-underscore-dangle:
    - error
    - allowAfterThis: false
  no-unexpected-multiline: error
  no-unmodified-loop-condition: 'off'
  no-unneeded-ternary:
    - error
    - defaultAssignment: false
  no-unreachable: error
  no-unsafe-finally: error
  no-unsafe-negation: error
  no-unused-expressions:
    - error
    - allowShortCircuit: false
      allowTaggedTemplates: false
      allowTernary: false
  no-unused-labels: error
  no-unused-vars:
    - error
    - args: after-used
      ignoreRestSiblings: true
      vars: local
  no-use-before-define:
    - error
    - classes: true
      functions: true
      variables: true
  no-useless-call: 'off'
  no-useless-computed-key: error
  no-useless-concat: error
  no-useless-constructor: error
  no-useless-escape: error
  no-useless-rename:
    - error
    - ignoreDestructuring: false
      ignoreExport: false
      ignoreImport: false
  no-useless-return: error
  no-var: 'off'
  no-void: error
  no-warning-comments:
    - 'off'
    - location: start
      terms:
        - todo
        - fixme
        - xxx
  no-whitespace-before-property: error
  no-with: error
  nonblock-statement-body-position: 'off'
  object-curly-newline:
    - 'off'
    - ObjectExpression:
        minProperties: 0
        multiline: true
      ObjectPattern:
        minProperties: 0
        multiline: true
  object-curly-spacing:
    - error
    - always
  object-property-newline:
    - error
    - allowMultiplePropertiesPerLine: true
  object-shorthand: 'off'
  one-var:
    - error
    - never
  one-var-declaration-per-line:
    - error
    - always
  operator-assignment:
    - error
    - always
  operator-linebreak: 'off'
  padded-blocks:
    - error
    - never
  prefer-arrow-callback:
    - error
    - allowNamedFunctions: false
      allowUnboundThis: true
  prefer-const:
    - error
    - destructuring: any
      ignoreReadBeforeAssign: true
  prefer-destructuring:
    - 'off'
    - array: true
      object: true
    - enforceForRenamedProperties: false
  prefer-numeric-literals: error
  prefer-promise-reject-errors:
    - 'off'
    - allowEmptyReject: true
  prefer-reflect: 'off'
  prefer-rest-params: error
  prefer-spread: error
  prefer-template: 'off'
  quote-props:
    - error
    - as-needed
    - keywords: false
      numbers: false
      unnecessary: true
  quotes:
    - error
    - single
    - avoidEscape: true
  radix: error
  require-await: 'off'
  require-jsdoc: 'off'
  require-yield: error
  rest-spread-spacing:
    - error
    - never
  semi:
    - error
    - always
  semi-spacing:
    - error
    - after: true
      before: false
  sort-imports:
    - 'off'
    - ignoreCase: false
      ignoreMemberSort: false
      memberSyntaxSortOrder:
        - none
        - all
        - multiple
        - single
  sort-keys:
    - 'off'
    - asc
    - caseSensitive: false
      natural: true
  sort-vars: 'off'
  space-before-blocks: error
  space-before-function-paren:
    - error
    - anonymous: always
      asyncArrow: always
      named: never
  space-in-parens:
    - error
    - never
  space-infix-ops: error
  space-unary-ops:
    - error
    - nonwords: false
      overrides: {}
      words: true
  spaced-comment:
    - error
    - always
    - block:
        balanced: false
        exceptions:
          - '-'
          - +
        markers:
          - =
          - '!'
      line:
        exceptions:
          - '-'
          - +
        markers:
          - =
          - '!'
  strict: 'off'
  symbol-description: error
  template-curly-spacing: error
  template-tag-spacing:
    - 'off'
    - never
  unicode-bom:
    - error
    - never
  use-isnan: error
  valid-jsdoc: 'off'
  valid-typeof:
    - error
    - requireStringLiterals: true
  vars-on-top: error
  wrap-iife:
    - error
    - outside
    - functionPrototypeMethods: false
  wrap-regex: 'off'
  yield-star-spacing:
    - error
    - after
  yoda: error
settings:
  import/core-modules: []
  import/extensions:
    - .js
    - .jsx
  import/ignore:
    - node_modules
    - \.(coffee|scss|css|less|hbs|svg|json)$
  import/resolver:
    node:
      extensions:
        - .js
        - .json