# Enable ecmascript 6 features.
ecmaFeatures:
  arrowFunctions: false
  binaryLiterals: false
  blockBindings: false
  classes: false
  defaultParams: false
  destructuring: false
  forOf: true
  generators: false
  modules: false
  objectLiteralComputedProperties: false
  objectLiteralDuplicateProperties: false
  objectLiteralShorthandMethods: false
  objectLiteralShorthandProperties: false
  octalLiterals: false
  regexUFlag: false
  regexYFlag: false
  restParams: true
  spread: false
  superInFunctions: false
  templateStrings: false
  unicodeCodePointEscapes: false
  globalReturn: false
  jsx: true
  experimentalObjectRestSpread: false

parser: espree

env:
  browser: true
  node: true
  commonjs: false
  shared-node-browser: true
  es6: true
  worker: false
  amd: true
  mocha: false
  jasmine: false
  jest: false
  phantomjs: false
  protractor: false
  qunit: false
  jquery: false
  prototypejs: false
  shelljs: false
  meteor: false
  mongo: false
  applescript: false
  serviceworker: true
  atomtest: false
  embertest: false
  webextensions: false
  greasemonkey: false

globals:
  $: false

# Linting rules for ESLint.
# 0's ignore a rule, 1's produce a warning, and 2's throw an error.
# See http://eslint.org/docs/rules/ for full documentation.
rules:

  # Rules for flagging POSSIBLE ERRORS.

  # Disallows assignment in conditional expressions.
  no-cond-assign:
    - 2
    - except-parens

  # Enforces flagging use of the console.
  no-console: 1

  # Disallows use of constant expressions in conditions.
  no-constant-condition: 2

  # Disallows control characters in regular expressions.
  no-control-regex: 2

  # Enforces flagging use of the debugger.
  no-debugger: 2

  # Disallow duplicate arguments in functions.
  no-dupe-args: 2

  # Disallows duplicate keys when creating object literals.
  no-dupe-keys: 2

  # Disallow a duplicate case label.
  no-duplicate-case: 2

  # Disallow the use of empty character classes in regular expressions.
  no-empty-character-class: 2

  # Disallows empty statements.
  no-empty: 2

  # Disallows assigning to the exception in a catch block.
  no-ex-assign: 2

  # Disallows double-negation boolean casts in a boolean context.
  no-extra-boolean-cast: 2

  # Disallows unnecessary parentheses.
  no-extra-parens:
    - 1
    - all

  # Disallows unnecessary semicolons.
  no-extra-semi: 2

  # Disallows overwriting functions written as declarations.
  no-func-assign: 2

  # Disallows function declarations in nested blocks.
  no-inner-declarations:
    - 2
    - functions

  # Disallows invalid regex strings in the RegExp constructor.
  no-invalid-regexp: 2

  # Disallows irregular whitespace outside of strings and comments.
  no-irregular-whitespace: 2

  # Disallows negation of the left operand of an in expression.
  no-negated-in-lhs: 2

  # Disallows use of the global Math and JSON objects as functions.
  no-obj-calls: 2

  # Disallow use of Object.prototypes builtins directly.
  no-prototype-builtins: 0

  # Disallows multiple spaces in a regular expression literal.
  no-regex-spaces: 2

  # Disallows sparse arrays.
  # Array values should be explicitly defined.
  no-sparse-arrays: 2

  # Disallow confusing multiline expressions.
  no-unexpected-multiline: 2

  # Disallows unreachable statements after a return, throw, continue, or break.
  no-unreachable: 2

  # Disallow control flow statements in finally blocks.
  no-unsafe-finally: 2

  # Disallows comparisons with the value NaN.
  use-isnan: 2

  # Enforces valid JSDoc parameters and return types comments.
  valid-jsdoc:
    - 2
    -
      prefer:
        return: returns
      requireReturn: false
      requireParamDescription: true
      requireReturnDescription: true
      requireReturnType: true

  # Enforces that the results of typeof are compared against a valid string.
  valid-typeof: 2


  # Rules for encouraging BEST PRACTICES.

  # Enforces getter/setter pairs in objects.
  accessor-pairs:
    - 1
    -
      getWithoutSet: false

  # Enforces return statements in callbacks of array's methods.
  array-callback-return: 2

  # Enforces treating var statements as if they were block scoped.
  block-scoped-var: 1

  # Enforces specific maximum cyclomatic complexity.
  complexity:
    - 1
    - 4

  # Enforces return statements to either always or never specify values.
  consistent-return: 2

  # Enforces curly brace conventions for all control statements.
  curly:
    - 1
    - multi-line
    - consistent

  # Enforces default case in switch statements.
  default-case: 2

  # Enforces consistent newlines before or after dots.
  dot-location:
    - 2
    - property

  # Enforces use of dot notation whenever possible.
  # `allowKeywords` = false follows ECMAScript version 3 compatible style.
  dot-notation:
    - 2
    -
      allowKeywords: false
      allowPattern: ''

  # Enforces use of === and !== over == and !=.
  eqeqeq:
     - 2
     - smart

  # Enforces necessary if statements in for-in loops.
  guard-for-in: 1

  # Disallows use of alert, confirm, and prompt.
  no-alert: 2

  # Disallows use of arguments.caller or arguments.callee.
  no-caller: 2

  # Disallow lexical declarations in case clauses.
  no-case-declarations: 2

  # Disallows division operators explicitly at beginning of regex.
  no-div-regex: 2

  # Disallows else after a return in an if.
  no-else-return: 2

  # Disallow use of empty functions.
  no-empty-function: 2

  # Disallow use of empty destructuring patterns.
  no-empty-pattern: 2

  # Disallows comparisons to null without a type-checking operator.
  no-eq-null: 2

  # Disallows use of eval().
  no-eval: 2

  # Disallows adding to native types.
  no-extend-native: 2

  # Disallows unnecessary function binding.
  no-extra-bind: 2

  # Disallow unnecessary labels.
  no-extra-label: 2

  # Disallows fallthrough of case statements.
  no-fallthrough: 1

  # Disallows use of leading or trailing decimal points in numeric literals.
  no-floating-decimal: 2

  # Disallow the type conversions with shorter notations.
  no-implicit-coercion:
    - 1
    -
      boolean: true
      number: true
      string: true

  # Disallow var and named functions in global scope.
  no-implicit-globals: 2

  # Disallows use of eval()-like methods.
  no-implied-eval: 2

  # Disallow this keyword outside of classes or class-like objects.
  no-invalid-this: 0

  # Disallows usage of __iterator__ property.
  no-iterator: 2

  # Disallows use of labeled statements.
  no-labels: 2

  # Disallows unnecessary nested blocks.
  no-lone-blocks: 2

  # Disallows creation of functions within loops.
  no-loop-func: 2

  # Disallow the use of magic numbers.
  no-magic-numbers:
    - 0
    -
      ignoreArrayIndexes: true
      enforceConst: true
      detectObjects: true

  # Disallows use of multiple spaces.
  no-multi-spaces:
    - 2
    -
      exceptions:
        BinaryExpression: false
        Property: true

  # Disallows use of multiline strings with a trailing backslash.
  # This rule is needed for ECMAScript environments earlier than 5.
  no-multi-str: 2

  # Disallows reassignments of native objects.
  no-native-reassign: 2

  # Disallows use of new operator for Function object.
  no-new-func: 2

  # Disallows creating new instances of String, Number, and Boolean.
  no-new-wrappers: 2

  # Disallows use of new operator when not part of the assignment or comparison.
  no-new: 1

  # Disallows use of octal escape sequences in string literals, e.g. "\251".
  no-octal-escape: 2

  # Disallows use of octal literals.
  no-octal: 2

  # Disallow reassignment of function parameters.
  no-param-reassign:
    - 0
    -
      props: false

  # Disallows usage of __proto__ property.
  no-proto: 2

  # Disallows declaring the same variable more then once.
  no-redeclare: 2

  # Disallows use of assignment in return statement.
  no-return-assign:
    - 2
    - 'except-parens'

  # Disallows use of javascript: urls.
  no-script-url: 2

  # Disallow assignments where both sides are exactly the same.
  no-self-assign: 2

  # Disallows comparisons where both sides are exactly the same.
  no-self-compare: 2

  # Disallows use of comma operator.
  no-sequences: 1

  # Restrict what can be thrown as an exception.
  no-throw-literal: 2

  # Disallow unmodified conditions of loops.
  no-unmodified-loop-condition: 2

  # Disallows usage of expressions in statement position.
  no-unused-expressions: 2

  # Disallow unused labels.
  no-unused-labels: 2

  # Disallow unnecessary .call() and .apply().
  no-useless-call: 2

  # Disallow unnecessary concatenation of literals or template literals.
  no-useless-concat: 2

  # Disallow unnecessary escape characters.
  no-useless-escape: 1

  # Disallows use of void operator.
  no-void: 2

  # Disallows use of configurable warning terms in comments, e. g. TODO.
  no-warning-comments:
    - 1
    -
      terms:
        - '@todo'
        - todo
        - fixme
        - xxx
      location: start

  # Disallows use of the with statement.
  no-with: 2

  # Require use of the second argument for parseInt().
  radix: 2

  # Require all vars on top of their containing scope.
  vars-on-top: 0

  # Require immediate function invocation to be wrapped in parentheses.
  wrap-iife:
    - 2
    - inside

  # Disallows Yoda conditions.
  yoda:
    - 2
    - never
    -
      exceptRange: true
      onlyEquality: false


  # Rules for STRICT MODE.

  # Controls location of Use Strict Directives.
  # Ensures all function bodies are strict mode code, while global code is not.
  # Caveat: when run on pre-concatenated code, global mode may look like
  # function mode after concatenation.
  strict:
    - 2
    - global


  # Rules for VARIABLES.

  # Require or disallow initialization in var declarations.
  init-declarations: 0

  # Disallows the catch clause parameter name being the same as a variable
  # in the outer scope.
  # This rule is needed for IE8- support.
  no-catch-shadow: 2

  # Disallows deletion of variables.
  no-delete-var: 2

  # Disallows labels that share a name with a variable.
  no-label-var: 2

  # Disallow specified global variables.
  no-restricted-globals: 2

  # Disallows shadowing of names such as arguments.
  no-shadow-restricted-names: 2

  # Disallows declaring variables already declared in the outer scope.
  no-shadow:
    - 1
    -
      hoist: functions

  # Disallows use of undefined when initializing variables.
  no-undef-init: 2

  # Disallows use of undeclared vars unless mentioned in a /*global */ block.
  no-undef:
    - 2
    - typeof: true

  # Disallows use of undefined variable.
  no-undefined: 2

  # Disallows declaration of variables that are not used in the code.
  no-unused-vars:
    - 1
    -
      vars: all
      varsIgnorePattern: ''
      args: after-used
      argsIgnorePattern: ''
      caughtErrors: 'none'
      caughtErrorsIgnorePattern: ''

  # Disallows use of variables before they are defined.
  no-use-before-define:
    - 2
    -
      functions: false
      classes: true


  # Rules for Node.js and CommonJS.

  # Enforce return after a callback.
  # callback, cb, and next are possible callback function names.
  callback-return:
    - 2
    -
      - callback
      - cb
      - next

  # Disallow require() outside of the top-level module scope.
  global-require: 2

  # Enforce error handling in callbacks.
  # Matches any string that contains err or Err (err, error, anyError, an_err).
  handle-callback-err:
    - 2
    - ^.*(e|E)rr

  # Disallows mixing regular variable and require declarations.
  # This rule may have inaccurate behavior in Node 0.6- and if UMD is used.
  no-mixed-requires:
    - 1
    -
      grouping: true
      allowCall: true

  # Disallows use of new operator with the require function.
  no-new-require: 2

  # Disallows string concatenation with __dirname and __filename.
  no-path-concat: 2

  # Disallows use of process.env.
  # Only applicable to Node.js.
  no-process-env: 2

  # Disallows use of process.exit().
  no-process-exit: 1

  # Restrict usage of specific node modules.
  no-restricted-modules: 0

  # Disallows use of synchronous methods.
  no-sync: 2


  # Rules for STYLISTIC ISSUES.
  # These rules are purely matters of style and are quite subjective.

  # Enforce spacing inside array brackets.
  array-bracket-spacing:
    - 1
    - always

  # Enforce spacing inside single line blocks.
  block-spacing:
    - 2
    - always

  # Enforce one true brace style.
  brace-style:
    - 2
    - 1tbs
    -
      allowSingleLine: true

  # Enforce camel case names.
  camelcase:
    - 1
    -
      properties: always

  # Consistent use of trailing commas in object and array literals.
  # This rule is needed for IE8- support.
  comma-dangle:
    - 2
    - never

  # Enforce spacing before and after comma.
  comma-spacing:
    - 2
    -
      before: false
      after: true

  # Enforce one true comma style.
  comma-style:
    - 2
    - last

  # Require or disallow padding inside computed properties.
  computed-property-spacing:
    - 1
    - never

  # Enforce consistent naming when capturing the current execution context.
  # This should be turned on if ESLint supports a regex for the
  # matching value in the future for the ^[_]?self regex.
  consistent-this:
    - 0
    - 'self'

  # Enforce newline at the end of file, with no multiple empty lines.
  eol-last:
    - 2
    - unix

  # Enforce function expressions not having a name.
  func-names: 0

  # Enforce use of function declarations or expressions
  # because of variable hoisting behavior.
  func-style:
    - 1
    - declaration
    -
      allowArrowFunctions: true

  # Blacklist certain identifiers to prevent them being used.
  id-blacklist:
    - 1
    - e

  # Enforces min/max identifier lengths (variable names, property names etc.).
  id-length:
    - 0
    -
      min: 3
      max: 10
      properties: never
      exceptions:
        - i

  # Require identifiers to match the provided regular expression.
  id-match:
    - 0
    - '^[a-z]+([A-Z][a-z]+)*$'
    -
      properties: false

  # Set a specific tab width for your code.
  indent:
    - 2
    - 2
    -
      SwitchCase: 1
      VariableDeclarator:
        var: 2
        let: 2
        const: 3

  # Enforce whether double or single quotes should be used in JSX attributes.
  jsx-quotes:
    - 2
    - prefer-single

  # Enforce spacing between keys and values in object literal properties.
  key-spacing:
    - 1
    -
      beforeColon: false
      afterColon: true
      mode: minimum

  # Enforce consistent spacing among keys/values in object literal properties.
  keyword-spacing:
    - 1
    -
      before: true

  # Disallow mixed 'LF' and 'CRLF' as linebreaks.
  linebreak-style:
    - 2
    - unix

  # Enforces empty lines around comments.
  lines-around-comment:
    - 1
    -
      beforeBlockComment: true
      afterBlockComment: false
      beforeLineComment: false
      afterLineComment: false
      allowBlockStart: false
      allowBlockEnd: false

  # Specifies maximum depth that blocks can be nested.
  max-depth:
    - 1
    - 5

  # Specifies maximum length of a line in your program.
  max-len:
    - 1
    -
      code: 80
      tabWidth: 4
      comments: 80
      ignorePattern: ''
      ignoreTrailingComments: true
      ignoreUrls: true

  # Enforce a maximum file length.
  max-lines:
    - 0
    -
      max: 300
      skipBlankLines: true
      skipComments: true

  # Specify the maximum depth callbacks can be nested.
  max-nested-callbacks:
    - 2
    - 3

  # Limits number of parameters that can be used in the function declaration.
  max-params:
    - 1
    - 5

  # Enforce a maximum number of statements allowed per line.
  max-statements-per-line:
    - 1
    -
      max: 2

  # Specifies maximum number of statement allowed in a function.
  max-statements:
    - 1
    - 25

  # Enforce newlines between operands of ternary expressions.
  multiline-ternary: 0

  # Require a capital letter for constructors.
  new-cap:
    - 2
    -
      newIsCap: true
      capIsNew: true
      newIsCapExceptions: []
      capIsNewExceptions: []

  # Disallows omission of parentheses when invoking a constructor with no arguments.
  new-parens: 2

  # Disallow an empty newline after var statement.
  newline-after-var:
    - 0
    - always

  # Require or disallow an empty line after var declarations.
  newline-before-return:
    - 0

  # Require a newline after each call in a method chain.
  newline-per-chained-call:
    - 0
    -
      ignoreChainWithDepth: 2

  # Disallows use of the Array constructor.
  no-array-constructor: 2

  # Disallows use of bitwise operators.
  no-bitwise: 0

  # Disallow use of the continue statement.
  no-continue: 1

  # Disallows inline after code.
  no-inline-comments: 1

  # Disallows if as the only statement in an else block.
  no-lonely-if: 2

  # Disallow mixes of different operators.
  no-mixed-operators: 1

  # Disallows mixed spaces and tabs for indentation.
  # Include "smart-tabs" option to suppresses warnings tabs used for alignment.
  no-mixed-spaces-and-tabs: 2

  # Disallows when more than 2 blank lines are used.
  no-multiple-empty-lines:
    - 1
    -
      max: 2
      maxEOF: 1
      maxBOF: 0

  # Disallows negated conditions.
  no-negated-condition: 2

  # Disallows nested ternary expressions.
  no-nested-ternary: 2

  # Disallows use of the Object constructor.
  no-new-object: 2

  # Disallows use of unary operators, ++ and --.
  no-plusplus: 0

  # Disallow use of certain syntax in code.
  no-restricted-syntax:
    - 1
    - WithStatement

  # Disallows space between function identifier and invocation.
  no-spaced-func: 2

  # Disallows the use of ternary operators.
  no-ternary: 0

  # Disallows trailing whitespace at the end of lines.
  no-trailing-spaces:
    - 2
    - skipBlankLines: false

  # Disallows dangling underscores in identifiers.
  no-underscore-dangle: 0

  # Disallow the use of Boolean literals in conditional expressions.
  no-unneeded-ternary: 0

  # Disallow whitespace before properties.
  no-whitespace-before-property: 2

  # Enforce consistent line breaks inside braces.
  object-curly-newline:
    - 0
    -
      multiline: true
      minProperties: 3

  # Require or disallow padding inside curly braces.
  object-curly-spacing:
    - 1
    - always
    -
      objectsInObjects: false
      arraysInObjects: false

  # Enforce placing object properties on separate lines.
  object-property-newline:
    - 1
    -
      allowMultiplePropertiesPerLine: true

  # Require or disallow an newline around variable declarations.
  one-var-declaration-per-line:
    - 2
    - initializations

  # Disallows multiple var statements per function.
  one-var:
    - 0
    - always

  # Requires assignment operator shorthand or prohibit it entirely.
  operator-assignment:
    - 2
    - always

  # Enforce operators to be placed before or after line breaks.
  operator-linebreak:
    - 1
    - after

  # Enforces padding within blocks.
  padded-blocks:
    - 0
    - always

  # Requires quotes around object literal property names.
  quote-props:
    - 1
    - consistent-as-needed
    -
      keywords: true
      unnecessary: true
      numbers: true

  # Specifies whether double or single quotes should be used.
  quotes:
    - 2
    - single
    - avoid-escape

  # Require JSDoc comment.
  require-jsdoc:
    - 1

  # Disallows space before semicolon.
  semi-spacing:
    - 2
    -
      before: false
      after: true

  # Requires or disallows use of semicolons instead of ASI.
  semi:
    - 2
    - always

  # Enforces sorting variables within the same declaration block.
  sort-vars: 0

  # Requires space before blocks.
  space-before-blocks:
    - 2
    -
      functions: always
      keywords: always
      classes: always

  # Requires space before function parentheses.
  space-before-function-paren:
    - 1
    -
      anonymous: never
      named: never

  # Requires spaces inside parentheses.
  space-in-parens:
    - 1
    - always

  # Requires spaces around operators.
  space-infix-ops:
    - 2
    -
      int32Hint: false

  # Requires spaces before/after unary operators.
  space-unary-ops:
    - 2
    -
      words: true
      nonwords: false

  # Require or disallow a space immediately following // or /* in a comment.
  spaced-comment:
    - 2
    - always
    -
      line:
        markers:
          - '/'
        exceptions:
          - '-'
          - '+'
      block:
        markers:
          - '!'
        exceptions:
          - '*'

  # Require or disallow the Unicode BOM.
  unicode-bom:
    - 2
    - never

  # Requires regex literals to be wrapped in parentheses.
  wrap-regex: 2


  # Rules for ECMASCRIPT 6.
  # These rules are only relevant to ES6 environments.

  # Require braces in arrow function body.
  arrow-body-style:
    - 2
    - as-needed

  # Require parens in arrow function arguments.
  arrow-parens:
    - 2
    - as-needed

  # Require space before/after arrow function's arrow.
  arrow-spacing:
    - 2
    -
      before: true
      after: true

  # Verify super() callings in constructors.
  constructor-super: 2

  # Enforces the position of the * in generator functions.
  generator-star-spacing:
    - 2
    -
      before: true
      after: false

  # Disallow modifying variables of class declarations.
  no-class-assign: 2

  # Disallow arrow functions where they could be confused with comparisons.
  no-confusing-arrow:
    - 1
    -
      allowParens: true

  # Disallow modifying variables that are declared using const.
  no-const-assign: 2

  # Disallow duplicate name in class members.
  no-dupe-class-members: 2

  # Disallow duplicate module imports.
  no-duplicate-imports:
    - 2
    -
      includeExports: true

  # Disallow use of the new operator with the Symbol object.
  # This rule should not be used in ES3/5 environments.
  no-new-symbol: 0

  # Restrict usage of specified node imports.
  no-restricted-imports: 0

  # Disallow to use this/super before super() calling in constructors.
  no-this-before-super: 2

  # Disallow unnecessary computed property keys in object literals.
  no-useless-computed-key: 2

  # Disallow unnecessary constructor.
  no-useless-constructor: 2

  # Disallow renaming import/export/destructured assignments to the same name.
  no-useless-rename:
    - 2
    -
      ignoreImport: false
      ignoreExport: false
      ignoreDestructuring: false

  # Requires using let or const instead of var.
  # This should be turned on when browser support is better.
  no-var: 0

  # Require method and property shorthand syntax for object literals.
  object-shorthand:
    - 0
    - always

  # Suggest using arrow functions as callbacks.
  # Should not be enabled in ES3/5 environments.
  prefer-arrow-callback: 0

  # Suggest using of const declaration for variables that are never modified.
  prefer-const: 1

  # Suggest using Reflect methods where applicable.
  # Should not be enabled in ES3/5 environments.
  prefer-reflect: 0

  # Suggest using the rest parameters instead of arguments.
  # Should not be enabled in ES3/5 environments.
  prefer-rest-params: 0

  # Suggest using the spread operator instead of .apply().
  # Should not be enabled in ES3/5 environments.
  prefer-spread: 0

  # Suggest using template literals instead of strings concatenation.
  # Should not be enabled in ES3/5 environments.
  prefer-template: 0

  # Disallow generator functions that do not have yield.
  require-yield: 1

  # Enforce spacing between rest and spread operators and their expressions.
  rest-spread-spacing:
    - 2
    - never

  # Sort import declarations within module.
  sort-imports:
    - 1
    -
      ignoreCase: false
      ignoreMemberSort: false
      memberSyntaxSortOrder:
        - none
        - all
        - multiple
        - single

  # Enforce spacing around embedded expressions of template strings.
  template-curly-spacing:
    - 1
    - always

  # Enforce spacing around the * in yield* expressions.
  yield-star-spacing:
    - 1
    -
      before: true
      after: false