.eslintrc

{
  "env": {
    "browser": true,
    "node": true,
    "mocha": true,
    "es6": true
  },
  "globals": {
    "__DEV__": true
  },
  "plugins": [
    "react"
  ],
  "ecmaFeatures": {
    "arrowFunctions": true,
    "blockBindings": true,
    "classes": true,
    "defaultParams": true,
    "destructuring": true,
    "forOf": true,
    "generators": false,
    "modules": true,
    "objectLiteralComputedProperties": true,
    "objectLiteralDuplicateProperties": false,
    "objectLiteralShorthandMethods": true,
    "objectLiteralShorthandProperties": true,
    "spread": true,
    "superInFunctions": true,
    "templateStrings": true,
    "jsx": true
  },
  "parser": "babel-eslint",
  "rules": {
    /*
     * Possible Errors
     * The following rules point out areas where you might have made mistakes.
     */

    // disallow trailing commas in object literals
    "comma-dangle": [2, "always-multiline"],
    // disallow assignment in conditional expressions
    "no-cond-assign": [2, "always"],
    // disallow use of console
    "no-console": 1,
    // 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": 2,
    // 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": 2,

    /*
     * Best Practices
     * These are rules designed to prevent you from making mistakes. They either prescribe a better way of doing something or help you avoid footguns.
     */

    // Enforces getter/setter pairs in objects
    "accessor-pairs": 0,
    // 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": 2,
    // specify curly brace conventions for all control statements
    "curly": [2, "all"],
    // require default case in switch statements
    "default-case": 2,
    // encourages use of dot notation whenever possible
    "dot-notation": [2, {
      "allowKeywords": true,
      "allowPattern": "^[a-z]+(_[a-z]+)+$"
    }],
    // enforces consistent newlines before or after dots
    "dot-location": [2, "property"],
    // require the use of === and !==
    "eqeqeq": 2,
    // make sure for-in loops have an if statement
    "guard-for-in": 2,
    // disallow the use of alert, confirm, and prompt
    "no-alert": 1,
    // disallow use of arguments.caller or arguments.callee
    "no-caller": 2,
    // disallow division operators explicitly at beginning of regular expression
    "no-div-regex": 2,
    // disallow else after a return in an if
    "no-else-return": 2,
    // disallow comparisons to null without a type-checking operator
    "no-eq-null": 2,
    // 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 labeled statements
    "no-labels": 2,
    // 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": 2,
    // 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
    "no-param-reassign": 2,
    // 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 usage of expressions in statement position
    "no-unused-expressions": 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
    "wrap-iife": [2, "any"],
    // require or disallow Yoda conditions
    "yoda": 2,

    /*
     * Strict Mode
     * These rules relate to using strict mode.
     */

    // controls location of Use Strict Directives
    // babel inserts `'use strict';` for us
    "strict": [2, "never"],

    /*
     * Variables
     * These rules have to do with variable declarations.
     */

     // 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": 2,
    // disallow deletion of variables
    "no-delete-var": 2,
    // disallow labels that share a name with a variable
    "no-label-var": 0,
    // 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,
    // disallow use of variables before they are defined
    "no-use-before-define": 2,

    /*
     * Node.js and CommonJS
     * These rules are specific to JavaScript running on Node.js or using CommonJS in the browser.
     */

    // 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,
    // 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,

    /*
     * Stylistic Issues
     * These rules are purely matters of style and are quite subjective.
     */

    // enforce spacing inside array brackets (fixable)
    "array-bracket-spacing": [2, "never"],
    // disallow or enforce spaces inside of single line blocks (fixable)
    "block-spacing": [2, "always"],
    // enforce one true brace style
    "brace-style": [2, "1tbs", {"allowSingleLine": true }],
    // require camel case names
    "camelcase": [2, {"properties": "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 (fixable)
    "computed-property-spacing": [2, "never"],
    // enforce consistent naming when capturing the current execution context
    "consistent-this": [2, "that"],
    // enforce newline at the end of file, with no multiple empty lines (fixable)
    "eol-last": 2,
    // require function expressions to have a name
    "func-names": 1,
    // enforce use of function declarations or expressions
    "func-style": 0,
    // this option enforces minimum and maximum identifier lengths (variable names, property names etc.)
    "id-length": 0,
    // require identifiers to match the provided regular expression
    "id-match": 0,
    // specify tab or space width for your code (fixable)
    "indent": [2, 2, {"SwitchCase": 1}],
    // specify whether double or single quotes should be used in JSX attributes
    "jsx-quotes": 2,
    // enforce spacing between keys and values in object literal properties
    "key-spacing": [2, {"beforeColon": false, "afterColon": true}],
    // disallow mixed 'LF' and 'CRLF' as linebreaks
    "linebreak-style": [2, "unix"],
    // enforce empty lines around comments
    "lines-around-comment": [2, {
      "beforeBlockComment": true,
      "afterBlockComment": false,
      "beforeLineComment": true,
      "afterLineComment": false,
      "allowBlockStart": true,
      "allowObjectStart": true
    }],
    // specify the maximum depth that blocks can be nested
    "max-depth": [2, 4],
    // specify the maximum length of a line in your program
    "max-len": [2, 80, 2, {"ignoreUrls": true}],
    // specify the maximum depth callbacks can be nested
    "max-nested-callbacks": [2, 7],
    // limits the number of parameters that can be used in the function declaration.
    "max-params": [1, 7],
    // specify the maximum number of statement allowed in a function
    "max-statements": [1, 100],
    // require a capital letter for constructors
    "new-cap": [2, {"newIsCap": true, "capIsNew": false}],
    // disallow the omission of parentheses when invoking a constructor with no arguments
    "new-parens": 2,
    // require or disallow an empty newline after variable declarations
    "newline-after-var": 0,
    // disallow use of the Array constructor
    "no-array-constructor": 2,
    // disallow use of bitwise operators
    "no-bitwise": 0,
    // disallow use of the continue statement
    "no-continue": 0,
    // disallow comments inline after code
    "no-inline-comments": 0,
    // disallow if as the only statement in an else block
    "no-lonely-if": 2,
    // disallow mixed spaces and tabs for indentation (recommended)
    "no-mixed-spaces-and-tabs": 2,
    // disallow multiple empty lines
    "no-multiple-empty-lines": [2, {"max": 3, "maxEOF": 1}],
    // disallow negated conditions
    "no-negated-condition": 0,
    // disallow nested ternary expressions
    "no-nested-ternary": 2,
    // disallow the use of the Object constructor
    "no-new-object": 2,
    // disallow use of unary operators, ++ and --
    "no-plusplus": 0,
    // disallow use of certain syntax in code
    "no-restricted-syntax": 0,
    // disallow space between function identifier and application (fixable)
    "no-spaced-func": 2,
    // disallow the use of ternary operators
    "no-ternary": 0,
    // disallow trailing whitespace at the end of lines (fixable)
    "no-trailing-spaces": 2,
    // disallow dangling underscores in identifiers
    "no-underscore-dangle": 1,
    // disallow the use of ternary operators when a simpler alternative exists
    "no-unneeded-ternary": 2,
    // require or disallow padding inside curly braces (fixable)
    "object-curly-spacing": [2, "always"],
    // require or disallow one variable declaration per function
    "one-var": [2, "never"],
    // require assignment operator shorthand where possible or prohibit it entirely
    "operator-assignment": 0,
    // enforce operators to be placed before or after line breaks
    "operator-linebreak": [2, "after"],
    // enforce padding within blocks
    "padded-blocks": [2, "never"],
    // require quotes around object literal property names
    "quote-props": [2, "as-needed", {"keywords": true, "unnecessary": true}],
    // specify whether backticks, double or single quotes should be used (fixable)
    "quotes": [2, "single"],
    // Require JSDoc comment
    "require-jsdoc": 0,
    // enforce spacing before and after semicolons
    "semi-spacing": [2, {"before": false, "after": true}],
    // require or disallow use of semicolons instead of ASI (fixable)
    "semi": [2, "always"],
    // sort variables within the same declaration block
    "sort-vars": 0,
    // require a space after certain keywords (fixable)
    "keyword-spacing": 2,
    // require or disallow a space before blocks (fixable)
    "space-before-blocks": 2,
    // require or disallow a space before function opening parenthesis (fixable)
    "space-before-function-paren": [2, "never"],
    // require or disallow spaces inside parentheses
    "space-in-parens": [2, "never"],
    // require spaces around operators (fixable)
    "space-infix-ops": [2, {"int32Hint": false}],
    // require or disallow spaces before/after unary operators (fixable)
    "space-unary-ops": [2, { "words": true, "nonwords": false }],
    // require or disallow a space immediately following the // or /* in a comment
    "spaced-comment": 2,
    // require regex literals to be wrapped in parentheses
    "wrap-regex": 0,

    /*
     * ECMAScript 6
     * These rules are only relevant to ES6 environments.
     */

    // require braces in arrow function body
    "arrow-body-style": 0, // [2, "as-needed"],
    // require parens in arrow function arguments
    "arrow-parens": [2, "always"],
    // require space before/after arrow function's arrow (fixable)
    "arrow-spacing": [2,{ "before": true, "after": true }],
    // verify calls of super() in constructors
    "constructor-super": 2,
    // enforce spacing around the * in generator functions (fixable)
    "generator-star-spacing": [2, {"before": false, "after": true}],
    // disallow modifying variables of class declarations
    "no-class-assign": 2,
    // disallow modifying variables that are declared using const
    "no-const-assign": 2,
    // disallow duplicate name in class members
    "no-dupe-class-members": 2,
    // disallow use of this/super before calling super() in constructors.
    "no-this-before-super": 2,
    // require let or const instead of var
    "no-var": 2,
    // require method and property shorthand syntax for object literals
    "object-shorthand": 2,
    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": 2,
    // suggest using const declaration for variables that are never modified after declared
    "prefer-const": 2,
    // suggest using Reflect methods where applicable
    "prefer-reflect": 0,
    // suggest using the spread operator instead of .apply().
    "prefer-spread": 1,
    // suggest using template literals instead of strings concatenation
    "prefer-template": 1,
    // disallow generator functions that do not have yield
    "require-yield": 0,

    /*
     * React specific rules used by Aribnb
     */
    // Prevent missing displayName in a React component definition
    "react/display-name": 0,
    // Enforce boolean attributes notation in JSX
    "react/jsx-boolean-value": 2,
    // Enforce or disallow spaces inside of curly braces in JSX attributes
    "react/jsx-curly-spacing": 0,
    // Prevent duplicate props in JSX
    "react/jsx-no-duplicate-props": 0,
    // Disallow undeclared variables in JSX
    "react/jsx-no-undef": 2,
    // Enforce quote style for JSX attributes
    "react/jsx-quotes": 0,
    // Enforce propTypes declarations alphabetical sorting
    "react/jsx-sort-prop-types": 0,
    // Enforce props alphabetical sorting
    "react/jsx-sort-props": 0,
    // Prevent React to be incorrectly marked as unused
    "react/jsx-uses-react": 2,
    // Prevent variables used in JSX to be incorrectly marked as unused
    "react/jsx-uses-vars": 2,
    // Prevent usage of dangerous JSX properties
    "react/no-danger": 0,
    // Prevent usage of setState in componentDidMount
    "react/no-did-mount-set-state": [2, "allow-in-func"],
    // Prevent usage of setState in componentDidUpdate
    "react/no-did-update-set-state": 2,
    // Prevent multiple component definition per file
    "react/no-multi-comp": 1,
    // Prevent usage of unknown DOM property
    "react/no-unknown-property": 2,
    // Prevent missing props validation in a React component definition
    "react/prop-types": 2,
    // Prevent missing React when using JSX
    "react/react-in-jsx-scope": 2,
    // Restrict file extensions that may be required
    "react/require-extension": 0,
    // Prevent extra closing tags for components without children
    "react/self-closing-comp": 2,
    // Enforce component methods order
    "react/sort-comp": [2, {
      "order": [
        "lifecycle",
        "/^on.+$/",
        "/^(get|set)(?!(InitialState$|DefaultProps$|ChildContext$)).+$/",
        "everything-else",
        "/^render.+$/",
        "render"
      ]
    }],
    // Prevent missing parentheses around multilines JSX
    "react/wrap-multilines": 2
  }
}