.eslintrc.json

{
  "rules": {
    // https://github.com/airbnb/javascript/tree/master/packages/eslint-config-airbnb
    /* best practices */
    "accessor-pairs": 0,
    // enforces return statements in callbacks of array's methods
    // http://eslint.org/docs/rules/array-callback-return
    "array-callback-return": 2,
    // treat var statements as if they were block scoped
    "block-scoped-var": 2,
    // specify the maximum cyclomatic complexity allowed in a program
    "complexity": [0, 11],
    // require return statements to either always or never specify values
    "consistent-return": 0,
    // specify curly brace conventions for all control statements
    "curly": [2, "multi-line"],
    // require default case in switch statements
    "default-case": 2,
    // encourages use of dot notation whenever possible
    "dot-notation": [2, {
      "allowKeywords": true
    }],
    // enforces consistent newlines before or after dots
    "dot-location": 0,
    // require the use of === and !==
    "eqeqeq": 2,
    // make sure for-in loops have an if statement
    "guard-for-in": 2,
    // Blacklist certain identifiers to prevent them being used
    // http://eslint.org/docs/rules/id-blacklist
    "id-blacklist": 0,
    // disallow the use of alert, confirm, and prompt
    "no-alert": 0,
    // disallow use of arguments.caller or arguments.callee
    "no-caller": 2,
    // disallow lexical declarations in case/default clauses
    // http://eslint.org/docs/rules/no-case-declarations.html
    "no-case-declarations": 2,
    // disallow division operators explicitly at beginning of regular expression
    "no-div-regex": 0,
    // disallow else after a return in an if
    "no-else-return": 2,
    // disallow Unnecessary Labels
    // http://eslint.org/docs/rules/no-extra-label
    "no-extra-label": 2,
    // disallow comparisons to null without a type-checking operator
    "no-eq-null": 0,
    // disallow use of eval()
    "no-eval": 2,
    // disallow adding to native types
    "no-extend-native": 2,
    // disallow unnecessary function binding
    "no-extra-bind": 2,
    // disallow fallthrough of case statements
    "no-fallthrough": 2,
    // disallow the use of leading or trailing decimal points in numeric literals
    "no-floating-decimal": 2,
    // disallow the type conversions with shorter notations
    "no-implicit-coercion": 0,
    // disallow use of eval()-like methods
    "no-implied-eval": 2,
    // disallow this keywords outside of classes or class-like objects
    "no-invalid-this": 0,
    // disallow usage of __iterator__ property
    "no-iterator": 2,
    // disallow use of labels for anything other then loops and switches
    "no-labels": [2, {
      "allowLoop": false,
      "allowSwitch": false
    }],
    // disallow unnecessary nested blocks
    "no-lone-blocks": 2,
    // disallow creation of functions within loops
    "no-loop-func": 2,
    // disallow use of multiple spaces
    "no-multi-spaces": 2,
    // disallow use of multiline strings
    "no-multi-str": 2,
    // disallow reassignments of native objects
    "no-native-reassign": 2,
    // disallow use of new operator when not part of the assignment or comparison
    "no-new": 0,
    // disallow use of new operator for Function object
    "no-new-func": 2,
    // disallows creating new instances of String, Number, and Boolean
    "no-new-wrappers": 2,
    // disallow use of (old style) octal literals
    "no-octal": 2,
    // disallow use of octal escape sequences in string literals, such as
    // var foo = "Copyright \251";
    "no-octal-escape": 2,
    // disallow reassignment of function parameters
    // disallow parameter object manipulation
    // rule: http://eslint.org/docs/rules/no-param-reassign.html
    "no-param-reassign": [2, {
      "props": false
    }],
    // disallow use of process.env
    "no-process-env": 0,
    // disallow usage of __proto__ property
    "no-proto": 2,
    // disallow declaring the same variable more then once
    "no-redeclare": 2,
    // disallow use of assignment in return statement
    "no-return-assign": 2,
    // disallow use of `javascript:` urls.
    "no-script-url": 2,
    // disallow comparisons where both sides are exactly the same
    "no-self-compare": 2,
    // disallow use of comma operator
    "no-sequences": 2,
    // restrict what can be thrown as an exception
    "no-throw-literal": 2,
    // disallow unmodified conditions of loops
    // http://eslint.org/docs/rules/no-unmodified-loop-condition
    "no-unmodified-loop-condition": 0,
    // disallow usage of expressions in statement position
    "no-unused-expressions": 2,
    // disallow unused labels
    // http://eslint.org/docs/rules/no-unused-labels
    "no-unused-labels": 2,
    // disallow unnecessary .call() and .apply()
    "no-useless-call": 0,
    // disallow use of void operator
    "no-void": 0,
    // disallow usage of configurable warning terms in comments: e.g. todo
    "no-warning-comments": [0, {
      "terms": ["todo", "fixme", "xxx"],
      "location": "start"
    }],
    // disallow use of the with statement
    "no-with": 2,
    // require use of the second argument for parseInt()
    "radix": 2,
    // requires to declare all vars on top of their containing scope
    "vars-on-top": 2,
    // require immediate function invocation to be wrapped in parentheses
    // http://eslint.org/docs/rules/wrap-iife.html
    "wrap-iife": [2, "outside"],
    // require or disallow Yoda conditions
    "yoda": 2,

    /* Errors */
    // disallow assignment in conditional expressions
    "no-cond-assign": [2, "always"],
    // disallow use of constant expressions in conditions
    "no-constant-condition": 1,
    // disallow control characters in regular expressions
    "no-control-regex": 2,
    // disallow use of debugger
    "no-debugger": 1,
    // disallow duplicate arguments in functions
    "no-dupe-args": 2,
    // disallow 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,
    // disallow empty statements
    "no-empty": 2,
    // disallow assigning to the exception in a catch block
    "no-ex-assign": 2,
    // disallow double-negation boolean casts in a boolean context
    "no-extra-boolean-cast": 0,
    // disallow unnecessary parentheses
    "no-extra-parens": [2, "functions"],
    // disallow unnecessary semicolons
    "no-extra-semi": 2,
    // disallow overwriting functions written as function declarations
    "no-func-assign": 2,
    // disallow function or variable declarations in nested blocks
    "no-inner-declarations": 2,
    // disallow invalid regular expression strings in the RegExp constructor
    "no-invalid-regexp": 2,
    // disallow irregular whitespace outside of strings and comments
    "no-irregular-whitespace": 2,
    // disallow negation of the left operand of an in expression
    "no-negated-in-lhs": 2,
    // disallow the use of object properties of the global object (Math and JSON) as functions
    "no-obj-calls": 2,
    // disallow multiple spaces in a regular expression literal
    "no-regex-spaces": 2,
    // disallow sparse arrays
    "no-sparse-arrays": 2,
    // disallow unreachable statements after a return, throw, continue, or break statement
    "no-unreachable": 2,
    // disallow comparisons with the value NaN
    "use-isnan": 2,
    // ensure JSDoc comments are valid
    "valid-jsdoc": 0,
    // ensure that the results of typeof are compared against a valid string
    "valid-typeof": 2,
    // Avoid code that looks like two expressions but is actually one
    "no-unexpected-multiline": 0,

    /* Legacy */
    // disallow trailing commas in object literals
    "comma-dangle": [2, "never"],
    // specify the maximum depth that blocks can be nested
    "max-depth": [0, 4],
    // limits the number of parameters that can be used in the function declaration.
    "max-params": [0, 3],
    // specify the maximum number of statement allowed in a function
    "max-statements": [0, 10],
    // disallow use of bitwise operators
    "no-bitwise": 0,
    // disallow use of unary operators, ++ and --
    "no-plusplus": 0,
    /* Node */
    // enforce return after a callback
    "callback-return": 0,
    // enforces error handling in callbacks (node environment)
    "handle-callback-err": 0,
    // disallow mixing regular variable and require declarations
    "no-mixed-requires": [0, false],
    // disallow use of new operator with the require function
    "no-new-require": 0,
    // disallow string concatenation with __dirname and __filename
    "no-path-concat": 0,
    // disallow process.exit()
    "no-process-exit": 0,
    // restrict usage of specified node modules
    "no-restricted-modules": 0,
    // disallow use of synchronous methods (off by default)
    "no-sync": 0,
    /* Variables */
    // enforce or disallow variable initializations at definition
    "init-declarations": 0,
    // disallow the catch clause parameter name being the same as a variable in the outer scope
    "no-catch-shadow": 0,
    // disallow deletion of variables
    "no-delete-var": 2,
    // disallow var and named functions in global scope
    // http://eslint.org/docs/rules/no-implicit-globals
    "no-implicit-globals": 0,
    // disallow labels that share a name with a variable
    "no-label-var": 0,
    // disallow self assignment
    // http://eslint.org/docs/rules/no-self-assign
    "no-self-assign": 2,
    // disallow shadowing of names such as arguments
    "no-shadow-restricted-names": 2,
    // disallow declaration of variables already declared in the outer scope
    "no-shadow": 2,
    // disallow use of undefined when initializing variables
    "no-undef-init": 0,
    // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undef": 2,
    // disallow use of undefined variable
    "no-undefined": 0,
    // disallow declaration of variables that are not used in the code
    "no-unused-vars": [2, {
      "vars": "local",
      "args": "after-used"
    }],
    // disallow use of variables before they are defined
    "no-use-before-define": 0,

    /* ES6 */
    // enforces no braces where they can be omitted
    // http://eslint.org/docs/rules/arrow-body-style
    "arrow-body-style": [0, "as-needed"],
    // require parens in arrow function arguments
    "arrow-parens": 0,
    // require space before/after arrow function's arrow
    // https://github.com/eslint/eslint/blob/master/docs/rules/arrow-spacing.md
    "arrow-spacing": [2, {
      "before": true,
      "after": true
    }],
    // require trailing commas in multiline object literals
    "comma-dangle": [0, "always-multiline"],
    // verify super() callings in constructors
    "constructor-super": 0,
    // enforce the spacing around the * in generator functions
    "generator-star-spacing": 0,
    // disallow modifying variables of class declarations
    "no-class-assign": 0,
    // disallow arrow functions where they could be confused with comparisons
    // http://eslint.org/docs/rules/no-confusing-arrow
    "no-confusing-arrow": [2, {
      "allowParens": true
    }],
    // disallow modifying variables that are declared using const
    "no-const-assign": 2,
    // disallow symbol constructor
    // http://eslint.org/docs/rules/no-new-symbol
    "no-new-symbol": 2,
    // disallow specific globals
    "no-restricted-globals": 0,
    // disallow specific imports
    // http://eslint.org/docs/rules/no-restricted-imports
    "no-restricted-imports": 0,
    // disallow to use this/super before super() calling in constructors.
    "no-this-before-super": 0,
    // require let or const instead of var
    "no-var": 0,
    // disallow unnecessary constructor
    // http://eslint.org/docs/rules/no-useless-constructor
    "no-useless-constructor": 2,
    // require method and property shorthand syntax for object literals
    // https://github.com/eslint/eslint/blob/master/docs/rules/object-shorthand.md
    "object-shorthand": [0, "always"],
    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": 0,
    // suggest using of const declaration for variables that are never modified after declared
    "prefer-const": 2,
    // suggest using the spread operator instead of .apply()
    "prefer-spread": 0,
    // suggest using Reflect methods where applicable
    "prefer-reflect": 0,
    // use rest parameters instead of arguments
    // http://eslint.org/docs/rules/prefer-rest-params
    "prefer-rest-params": 2,
    // suggest using template literals instead of string concatenation
    // http://eslint.org/docs/rules/prefer-template
    "prefer-template": 1,
    // disallow generator functions that do not have yield
    "require-yield": 0,
    // import sorting
    // http://eslint.org/docs/rules/sort-imports
    "sort-imports": 0,
    // enforce usage of spacing in template strings
    // http://eslint.org/docs/rules/template-curly-spacing
    "template-curly-spacing": 2,
    // enforce spacing around the * in yield* expressions
    // http://eslint.org/docs/rules/yield-star-spacing
    "yield-star-spacing": [2, "after"],
    "indent": ["error", 2],
    "quotes": [
      "error",
      "single"
    ],
    "semi": [
      "error",
      "never"
    ]
  },
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module"
  },
  "env": {
    "commonjs": true,
    "node": true,
    "es6": true,
    "mocha": true
  }
}