[eslint config] [react] [breaking] enable jsx-a11y rules:

- `jsx-a11y/heading-has-content`
 - `jsx-a11y/html-has-lang`
 - `jsx-a11y/lang`
 - `jsx-a11y/no-marquee`
 - `jsx-a11y/scope`
 - `jsx-a11y/href-no-hash`
 - `jsx-a11y/label-has-for`

.travis.yml

@@ -0,0 +1,17 @@
+language: node_js
+node_js:
+  - "6"
+  - "5"
+  - "4"
+env:
+  - 'TEST_DIR=packages/eslint-config-airbnb'
+  - 'TEST_DIR=packages/eslint-config-airbnb-base'
+before_install:
+  - 'cd $TEST_DIR'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then case "$(npm --version)" in 1.*) npm install -g npm@1.4.28 ;; 2.*) npm install -g npm@2 ;; esac ; fi'
+  - 'if [ "${TRAVIS_NODE_VERSION}" != "0.6" ] && [ "${TRAVIS_NODE_VERSION}" != "0.9" ]; then npm install -g npm; fi'
+script:
+  - 'npm run travis'
+sudo: false
+matrix:
+  fast_finish: true

es5/README.md

@@ -267,7 +267,7 @@
 
     ```javascript
     // anonymous function expression
-    var anonymous = function() {
+    var anonymous = function () {
       return true;
     };
 
@@ -277,9 +277,9 @@
     };
 
     // immediately-invoked function expression (IIFE)
-    (function() {
+    (function () {
       console.log('Welcome to the Internet. Please follow me.');
-    })();
+    }());
     ```
 
   - Never declare a function in a non-function block (if, while, etc). Assign the function to a variable instead. Browsers will allow you to do it, but they all interpret it differently, which is bad news bears.
@@ -417,7 +417,7 @@
 
     ```javascript
     // bad
-    function() {
+    function () {
       test();
       console.log('doing stuff..');
 
@@ -433,7 +433,7 @@
     }
 
     // good
-    function() {
+    function () {
       var name = getName();
 
       test();
@@ -449,7 +449,7 @@
     }
 
     // bad - unnecessary function call
-    function() {
+    function () {
       var name = getName();
 
       if (!arguments.length) {
@@ -462,7 +462,7 @@
     }
 
     // good
-    function() {
+    function () {
       var name;
 
       if (!arguments.length) {
@@ -517,7 +517,7 @@
 
       anonymous(); // => TypeError anonymous is not a function
 
-      var anonymous = function() {
+      var anonymous = function () {
         console.log('anonymous function expression');
       };
     }
@@ -635,10 +635,10 @@
     }
 
     // bad
-    function() { return false; }
+    function () { return false; }
 
     // good
-    function() {
+    function () {
       return false;
     }
     ```
@@ -717,7 +717,7 @@
     function getType() {
       console.log('fetching type...');
       // set the default type to 'no type'
-      var type = this._type || 'no type';
+      var type = this.type || 'no type';
 
       return type;
     }
@@ -727,7 +727,7 @@
       console.log('fetching type...');
 
       // set the default type to 'no type'
-      var type = this._type || 'no type';
+      var type = this.type || 'no type';
 
       return type;
     }
@@ -768,17 +768,17 @@
 
     ```javascript
     // bad
-    function() {
+    function () {
     ∙∙∙∙var name;
     }
 
     // bad
-    function() {
+    function () {
     ∙var name;
     }
 
     // good
-    function() {
+    function () {
     ∙∙var name;
     }
     ```
@@ -847,14 +847,14 @@
 
     ```javascript
     // bad
-    (function(global) {
+    (function (global) {
       // ...stuff...
     })(this);
     ```
 
     ```javascript
     // bad
-    (function(global) {
+    (function (global) {
       // ...stuff...
     })(this);↵
     ↵
@@ -862,7 +862,7 @@
 
     ```javascript
     // good
-    (function(global) {
+    (function (global) {
       // ...stuff...
     })(this);↵
     ```
@@ -925,19 +925,19 @@
 
     // bad
     var obj = {
-      foo: function() {
+      foo: function () {
       },
-      bar: function() {
+      bar: function () {
       }
     };
     return obj;
 
     // good
     var obj = {
-      foo: function() {
+      foo: function () {
       },
 
-      bar: function() {
+      bar: function () {
       }
     };
 
@@ -1020,19 +1020,19 @@
 
     ```javascript
     // bad
-    (function() {
+    (function () {
       var name = 'Skywalker'
       return name
     })()
 
     // good
-    (function() {
+    (function () {
       var name = 'Skywalker';
       return name;
     })();
 
     // good (guards against the function becoming an argument when two files with IIFEs are concatenated)
-    ;(function() {
+    ;(function () {
       var name = 'Skywalker';
       return name;
     })();
@@ -1178,50 +1178,60 @@
     });
     ```
 
-  - Use a leading underscore `_` when naming private properties.
+  - Do not use trailing or leading underscores.
+
+  > Why? JavaScript does not have the concept of privacy in terms of properties or methods. Although a leading underscore is a common convention to mean “private”, in fact, these properties are fully public, and as such, are part of your public API contract. This convention might lead developers to wrongly think that a change won't count as breaking, or that tests aren't needed. tl;dr: if you want something to be “private”, it must not be observably present.
 
     ```javascript
     // bad
     this.__firstName__ = 'Panda';
     this.firstName_ = 'Panda';
+    this._firstName = 'Panda';
 
     // good
-    this._firstName = 'Panda';
+    this.firstName = 'Panda';
     ```
 
-  - When saving a reference to `this` use `_this`.
+  - Don't save references to this. Use Function#bind.
 
     ```javascript
     // bad
-    function() {
+    function () {
       var self = this;
-      return function() {
+      return function () {
         console.log(self);
       };
     }
 
     // bad
-    function() {
+    function () {
       var that = this;
-      return function() {
+      return function () {
         console.log(that);
       };
     }
 
-    // good
-    function() {
+    // bad
+    function () {
       var _this = this;
-      return function() {
+      return function () {
         console.log(_this);
       };
     }
+
+    // good
+    function () {
+      return function () {
+        console.log(this);
+      }.bind(this);
+    }
     ```
 
   - Name your functions. This is helpful for stack traces.
 
     ```javascript
     // bad
-    var log = function(msg) {
+    var log = function (msg) {
       console.log(msg);
     };
 
@@ -1297,11 +1307,11 @@
       this.set('lightsaber', lightsaber);
     }
 
-    Jedi.prototype.set = function(key, val) {
+    Jedi.prototype.set = function set(key, val) {
       this[key] = val;
     };
 
-    Jedi.prototype.get = function(key) {
+    Jedi.prototype.get = function get(key) {
       return this[key];
     };
     ```
@@ -1343,12 +1353,12 @@
 
     ```javascript
     // bad
-    Jedi.prototype.jump = function() {
+    Jedi.prototype.jump = function jump() {
       this.jumping = true;
       return true;
     };
 
-    Jedi.prototype.setHeight = function(height) {
+    Jedi.prototype.setHeight = function setHeight(height) {
       this.height = height;
     };
 
@@ -1357,12 +1367,12 @@
     luke.setHeight(20); // => undefined
 
     // good
-    Jedi.prototype.jump = function() {
+    Jedi.prototype.jump = function jump() {
       this.jumping = true;
       return this;
     };
 
-    Jedi.prototype.setHeight = function(height) {
+    Jedi.prototype.setHeight = function setHeight(height) {
       this.height = height;
       return this;
     };
@@ -1404,7 +1414,7 @@
 
     ...
 
-    $(this).on('listingUpdated', function(e, listingId) {
+    $(this).on('listingUpdated', function (e, listingId) {
       // do something with listingId
     });
     ```
@@ -1417,7 +1427,7 @@
 
     ...
 
-    $(this).on('listingUpdated', function(e, data) {
+    $(this).on('listingUpdated', function (e, data) {
       // do something with data.listingId
     });
     ```
@@ -1435,7 +1445,7 @@
     ```javascript
     // fancyInput/fancyInput.js
 
-    !function(global) {
+    !function (global) {
       'use strict';
 
       var previousFancyInput = global.FancyInput;
@@ -1530,7 +1540,7 @@
   - **Yup.**
 
     ```javascript
-    function() {
+    function () {
       return true;
     }
     ```
@@ -1562,7 +1572,7 @@
 **Tools**
 
   - Code Style Linters
-    + [JSHint](http://www.jshint.com/) - [Airbnb Style .jshintrc](https://github.com/airbnb/javascript/blob/master/linters/jshintrc)
+    + [JSHint](http://www.jshint.com/) - [Airbnb Style .jshintrc](https://github.com/airbnb/javascript/blob/master/linters/.jshintrc)
     + [JSCS](https://github.com/jscs-dev/node-jscs) - [Airbnb Style Preset](https://github.com/jscs-dev/node-jscs/blob/master/presets/airbnb.json)
 
 **Other Style Guides**
@@ -1672,6 +1682,7 @@
   - **Shutterfly**: [shutterfly/javascript](https://github.com/shutterfly/javascript)
   - **StudentSphere**: [studentsphere/javascript](https://github.com/studentsphere/javascript)
   - **Super**: [SuperJobs/javascript](https://github.com/SuperJobs/javascript)
+  - **SysGarage**: [sysgarage/javascript-style-guide](https://github.com/sysgarage/javascript-style-guide)
   - **Target**: [target/javascript](https://github.com/target/javascript)
   - **TheLadders**: [TheLadders/javascript](https://github.com/TheLadders/javascript)
   - **T4R Technology**: [T4R-Technology/javascript](https://github.com/T4R-Technology/javascript)

linters/.jshintrc

@@ -14,7 +14,7 @@
   "node": true,
 
   // Allow ES6.
-  "esnext": true,
+  "esversion": 6,
 
   /*
    * ENFORCING OPTIONS

linters/README.md

@@ -1,11 +0,0 @@
-## `.eslintrc`
-
-Our `.eslintrc` requires the following NPM packages:
-
-```
-npm install --save-dev \
-  eslint-config-airbnb \
-  eslint \
-  babel-eslint \
-  eslint-plugin-react
-```

linters/SublimeLinter/SublimeLinter.sublime-settings

@@ -63,7 +63,7 @@
 
       // Warn when variables are defined but never used.
       "unused": true,
-      
+
       // Enforce line length to 80 characters
       "maxlen": 80,
 

package.json

@@ -3,8 +3,15 @@
   "version": "2.0.0",
   "description": "A mostly reasonable approach to JavaScript.",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
-    "publish-all": "npm publish && cd ./packages/eslint-config-airbnb && npm publish"
+    "preinstall": "npm run install:config && npm run install:config:base",
+    "install:config": "cd packages/eslint-config-airbnb && npm prune && npm install",
+    "install:config:base": "cd packages/eslint-config-airbnb-base && npm prune && npm install",
+    "test": "npm run --silent test:config && npm run --silent test:config:base",
+    "test:config": "cd packages/eslint-config-airbnb; npm test",
+    "test:config:base": "cd packages/eslint-config-airbnb-base; npm test",
+    "travis": "npm run --silent travis:config && npm run --silent travis:config:base",
+    "travis:config": "cd packages/eslint-config-airbnb; npm run travis",
+    "travis:config:base": "cd packages/eslint-config-airbnb-base; npm run travis"
   },
   "repository": {
     "type": "git",

packages/eslint-config-airbnb-base/.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["airbnb"]
+}

packages/eslint-config-airbnb-base/.eslintrc

@@ -0,0 +1,8 @@
+{
+  "extends": "./index.js",
+  "rules": {
+    // disable requiring trailing commas because it might be nice to revert to
+    // being JSON at some point, and I don't want to make big changes now.
+    "comma-dangle": 0
+  }
+}

packages/eslint-config-airbnb-base/CHANGELOG.md

@@ -0,0 +1,84 @@
+5.0.1 / 2016-07-29
+==================
+ - [patch] `no-unused-expressions`: flesh out options
+ - [deps] update `eslint` to `v3.2`, `eslint-plugin-import` to `v1.12`
+ - [tests] improve prepublish script
+
+5.0.0 / 2016-07-24
+==================
+ - [breaking] enable `import/newline-after-import`
+ - [breaking] enable overlooked rules: `linebreak-style`, `new-parens`, `no-continue`, `no-lonely-if`, `operator-assignment`, `space-unary-ops`, `dot-location`, `no-extra-boolean-cast`, `no-this-before-super`, `require-yield`, `no-path-concat`, `no-label-var`, `no-void`, `constructor-super`, `prefer-spread`, `no-new-require`, `no-undef-init`, `no-unexpected-multiline`
+ - [deps] update `eslint`, `eslint-find-rules`, `eslint-plugin-import`, `babel-tape-runner`; add `babel-preset-airbnb`
+ - [patch] flesh out defaults: `jsx-quotes`
+ - [docs] update the peer dep install command to dynamically look up the right version numbers when installing peer deps
+ - [tests] fix prepublish scripts
+
+4.0.2 / 2016-07-14
+==================
+ - [fix] repair accidental comma-dangle change
+
+4.0.1 / 2016-07-14 (unpublished)
+==================
+ - [fix] Prevent trailing commas in the legacy config (#950)
+ - [deps] update `eslint-plugin-import`
+
+4.0.0 / 2016-07-02
+==================
+ - [breaking] [deps] update `eslint` to v3; drop support for < node 4
+ - [breaking] enable `rest-spread-spacing` rule
+ - [breaking] enable `no-mixed-operators` rule
+ - [breaking] enable `import` rules: `no-named-as-default`, `no-named-as-default-member`, `no-extraneous-dependencies`
+ - [breaking] enable `object-property-newline` rule
+ - [breaking] enable `no-prototype-builtins` rule
+ - [breaking] enable `no-useless-rename` rule
+ - [breaking] enable `unicode-bom` rule
+ - [breaking] Enforce proper generator star spacing (#887)
+ - [breaking] Enable imports/imports-first rule (#882)
+ - [breaking] re-order rules; put import rules in separate file (#881)
+ - [patch] `newline-per-chained-call`: bump the limit to 4
+ - [patch] `object-shorthand`: do not warn when the concise form would have a string literal as a name
+ - [patch] Loosen `prefer-const` to not warn when the variable is “read” before being assigned to
+ - [refactor] fix quoting of rule properties (#885)
+ - [refactor] `quotes`: Use object option form rather than deprecated string form.
+ - [deps] update `eslint`, `eslint-plugin-import`, `eslint-find-rules`, `tape`
+ - [tests] Only run `eslint-find-rules` on prepublish, not in tests
+
+3.0.1 / 2016-05-08
+==================
+ - [patch] re-disable `no-extra-parens` (#869, #867)
+
+3.0.0 / 2016-05-07
+==================
+ - [breaking] enable `import/no-mutable-exports`
+ - [breaking] enable `no-class-assign` rule, to pair with `no-func-assign`
+ - [breaking] widen `no-extra-parens` to include everything, except `nestedBinaryExpressions`
+ - [breaking] Re-enabling `newline-per-chained-call` (#748)
+ - [minor] enable `import/no-amd`
+ - [patch] enable `import/no-duplicates`
+ - [deps] update `eslint`, `eslint-plugin-import`, `eslint-find-rules`
+
+2.0.0 / 2016-04-29
+==================
+ - [breaking] enable `no-unsafe-finally` rule
+ - [semver-minor] enable `no-useless-computed-key` rule
+ - [deps] update `eslint`, `eslint-plugin-import`
+
+1.0.4 / 2016-04-26
+==================
+ - [deps] update `eslint-find-rules`, `eslint-plugin-import`
+
+1.0.3 / 2016-04-21
+==================
+ - [patch: loosen rules] Allow empty class/object methods
+
+1.0.2 / 2016-04-20
+==================
+ - [patch: loosen rules] Allow `break` (#840)
+
+1.0.1 / 2016-04-19
+==================
+ - [patch: loosen rules] Allow `== null` (#542)
+
+1.0.0 / 2016-04-19
+==================
+ - Initial commmit; moved content over from `eslint-config-airbnb` package.

packages/eslint-config-airbnb-base/README.md

@@ -0,0 +1,59 @@
+# eslint-config-airbnb-base
+
+[![npm version](https://badge.fury.io/js/eslint-config-airbnb-base.svg)](http://badge.fury.io/js/eslint-config-airbnb-base)
+
+This package provides Airbnb's base JS .eslintrc as an extensible shared config.
+
+## Usage
+
+We export two ESLint configurations for your usage.
+
+### eslint-config-airbnb-base
+
+Our default export contains all of our ESLint rules, including ECMAScript 6+. It requires `eslint` and `eslint-plugin-import`.
+
+1. Ensure packages are installed with correct version numbers by running:
+  ```sh
+  (
+    export PKG=eslint-config-airbnb-base;
+    npm info "$PKG" peerDependencies --json | command sed 's/[\{\},]//g ; s/: /@/g' | xargs npm install --save-dev "$PKG"
+  )
+  ```
+
+  Which produces and runs a command like:
+
+  ```sh
+    npm install --save-dev eslint-config-airbnb-base eslint@^3.0.1 eslint-plugin-import@^1.10.3
+  ```
+
+2. Add `"extends": "airbnb-base"` to your .eslintrc
+
+### eslint-config-airbnb-base/legacy
+
+Lints ES5 and below. Requires `eslint` and `eslint-plugin-import`.
+
+1. Ensure packages are installed with correct version numbers by running:
+  ```sh
+  (
+    export PKG=eslint-config-airbnb-base;
+    npm info "$PKG" peerDependencies --json | command sed 's/[\{\},]//g ; s/: /@/g' | xargs npm install --save-dev "$PKG"
+  )
+  ```
+
+  Which produces and runs a command like:
+
+  ```sh
+  npm install --save-dev eslint-config-airbnb-base eslint@^3.0.1 eslint-plugin-import@^1.10.3
+  ```
+
+2. Add `"extends": "airbnb-base/legacy"` to your .eslintrc
+
+See [Airbnb's overarching ESLint config](https://npmjs.com/eslint-config-airbnb), [Airbnb's Javascript styleguide](https://github.com/airbnb/javascript), and the [ESlint config docs](http://eslint.org/docs/user-guide/configuring#extending-configuration-files) for more information.
+
+## Improving this config
+
+Consider adding test cases if you're making complicated rules changes, like anything involving regexes. Perhaps in a distant future, we could use literate programming to structure our README as test cases for our .eslintrc?
+
+You can run tests with `npm test`.
+
+You can make sure this module lints with itself using `npm run lint`.

packages/eslint-config-airbnb-base/index.js

@@ -0,0 +1,18 @@
+module.exports = {
+  extends: [
+    './rules/best-practices',
+    './rules/errors',
+    './rules/node',
+    './rules/style',
+    './rules/variables',
+    './rules/es6',
+    './rules/imports',
+  ].map(require.resolve),
+  parserOptions: {
+    ecmaVersion: 7,
+    sourceType: 'module',
+  },
+  rules: {
+    strict: 2,
+  }
+};

packages/eslint-config-airbnb-base/legacy.js

@@ -0,0 +1,21 @@
+module.exports = {
+  extends: [
+    './rules/best-practices',
+    './rules/errors',
+    './rules/node',
+    './rules/style',
+    './rules/variables'
+  ].map(require.resolve),
+  env: {
+    browser: true,
+    node: true,
+    amd: false,
+    mocha: false,
+    jasmine: false
+  },
+  ecmaFeatures: {},
+  globals: {},
+  rules: {
+    'comma-dangle': [2, 'never']
+  }
+};

packages/eslint-config-airbnb-base/package.json

@@ -0,0 +1,63 @@
+{
+  "name": "eslint-config-airbnb-base",
+  "version": "5.0.1",
+  "description": "Airbnb's base JS ESLint config, following our styleguide",
+  "main": "index.js",
+  "scripts": {
+    "lint": "eslint .",
+    "tests-only": "babel-tape-runner ./test/test-*.js",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test)",
+    "pretest": "npm run --silent lint",
+    "test": "npm run --silent tests-only",
+    "travis": "npm run --silent test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/airbnb/javascript"
+  },
+  "keywords": [
+    "eslint",
+    "eslintconfig",
+    "config",
+    "airbnb",
+    "javascript",
+    "styleguide"
+  ],
+  "author": "Jake Teton-Landis (https://twitter.com/@jitl)",
+  "contributors": [
+    {
+      "name": "Jake Teton-Landis",
+      "url": "https://twitter.com/jitl"
+    },
+    {
+      "name": "Jordan Harband",
+      "email": "ljharb@gmail.com",
+      "url": "http://ljharb.codes"
+    },
+    {
+      "name": "Harrison Shoff",
+      "url": "https://twitter.com/hshoff"
+    }
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/airbnb/javascript/issues"
+  },
+  "homepage": "https://github.com/airbnb/javascript",
+  "devDependencies": {
+    "babel-preset-airbnb": "^2.0.0",
+    "babel-tape-runner": "^2.0.1",
+    "eslint": "^3.2.0",
+    "eslint-find-rules": "^1.11.1",
+    "eslint-plugin-import": "^1.12.0",
+    "in-publish": "^2.0.0",
+    "tape": "^4.6.0"
+  },
+  "peerDependencies": {
+    "eslint": "^3.2.0",
+    "eslint-plugin-import": "^1.12.0"
+  },
+  "engines": {
+    "node": ">= 4"
+  }
+}

packages/eslint-config-airbnb-base/rules/best-practices.js

@@ -1,115 +1,235 @@
 module.exports = {
-  'rules': {
-    // Enforces getter/setter pairs in objects
+  rules: {
+    // enforces getter/setter pairs in objects
     '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],
+    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, 'multi-line'],
+    curly: [2, 'multi-line'],
+
     // require default case in switch statements
-    'default-case': 2,
+    'default-case': [2, { commentPattern: '^no default$' }],
+
     // encourages use of dot notation whenever possible
-    'dot-notation': [2, { 'allowKeywords': true}],
+    'dot-notation': [2, { allowKeywords: true }],
+
     // enforces consistent newlines before or after dots
-    'dot-location': 0,
+    // http://eslint.org/docs/rules/dot-location
+    'dot-location': [2, 'property'],
+
     // require the use of === and !==
-    'eqeqeq': 2,
+    // http://eslint.org/docs/rules/eqeqeq
+    eqeqeq: [2, 'allow-null'],
+
     // 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 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
+    // http://eslint.org/docs/rules/no-div-regex
     'no-div-regex': 0,
+
     // disallow else after a return in an if
     'no-else-return': 2,
-    // disallow use of labels for anything other then loops and switches
-    'no-empty-label': 2,
+
+    // disallow empty functions, except for standalone funcs/arrows
+    // http://eslint.org/docs/rules/no-empty-function
+    'no-empty-function': [2, {
+      allow: [
+        'arrowFunctions',
+        'functions',
+        'methods',
+      ]
+    }],
+
+    // disallow empty destructuring patterns
+    // http://eslint.org/docs/rules/no-empty-pattern
+    'no-empty-pattern': 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 Unnecessary Labels
+    // http://eslint.org/docs/rules/no-extra-label
+    'no-extra-label': 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 implicit type conversions
+    // http://eslint.org/docs/rules/no-implicit-coercion
+    'no-implicit-coercion': [0, {
+      boolean: false,
+      number: true,
+      string: true,
+      allow: [],
+    }],
+
+    // disallow var and named functions in global scope
+    // http://eslint.org/docs/rules/no-implicit-globals
+    'no-implicit-globals': 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 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 magic numbers
+    // http://eslint.org/docs/rules/no-magic-numbers
+    'no-magic-numbers': [0, {
+      ignore: [],
+      ignoreArrayIndexes: true,
+      enforceConst: true,
+      detectObjects: false,
+    }],
+
     // 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
+
+    // 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': true }],
-    // disallow use of process.env
-    'no-process-env': 0,
+    'no-param-reassign': [2, { props: true }],
+
     // 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 self assignment
+    // http://eslint.org/docs/rules/no-self-assign
+    'no-self-assign': 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,
+    'no-unused-expressions': [2, {
+      allowShortCircuit: false,
+      allowTernary: false,
+    }],
+
+    // 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 useless string concatenation
+    // http://eslint.org/docs/rules/no-useless-concat
+    'no-useless-concat': 2,
+
+    // disallow unnecessary string escaping
+    // http://eslint.org/docs/rules/no-useless-escape
+    'no-useless-escape': 2,
+
     // disallow use of void operator
-    'no-void': 0,
+    // http://eslint.org/docs/rules/no-void
+    'no-void': 2,
+
     // disallow usage of configurable warning terms in comments: e.g. todo
-    'no-warning-comments': [0, { 'terms': ['todo', 'fixme', 'xxx'], 'location': 'start' }],
+    '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,
+    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'],
+    // http://eslint.org/docs/rules/wrap-iife.html
+    'wrap-iife': [2, 'outside'],
+
     // require or disallow Yoda conditions
-    'yoda': 2
+    yoda: 2
   }
 };

packages/eslint-config-airbnb-base/rules/errors.js

@@ -1,60 +1,103 @@
 module.exports = {
-  'rules': {
-    // disallow trailing commas in object literals
+  rules: {
+    // require trailing commas in multiline 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,
+    'no-debugger': 2,
+
     // 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 the use of empty character classes in regular expressions
+    'no-empty-character-class': 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,
+    // http://eslint.org/docs/rules/no-extra-boolean-cast
+    'no-extra-boolean-cast': 2,
+
     // disallow unnecessary parentheses
-    'no-extra-parens': [2, 'functions'],
+    // http://eslint.org/docs/rules/no-extra-parens
+    'no-extra-parens': [0, 'all', {
+      conditionalAssign: true,
+      nestedBinaryExpressions: false,
+      returnAssign: false,
+    }],
+
     // 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 use of Object.prototypes builtins directly
+    // http://eslint.org/docs/rules/no-prototype-builtins
+    'no-prototype-builtins': 2,
+
     // disallow multiple spaces in a regular expression literal
     'no-regex-spaces': 2,
+
     // disallow sparse arrays
     'no-sparse-arrays': 2,
+
+    // Avoid code that looks like two expressions but is actually one
+    // http://eslint.org/docs/rules/no-unexpected-multiline
+    'no-unexpected-multiline': 2,
+
     // disallow unreachable statements after a return, throw, continue, or break statement
     'no-unreachable': 2,
+
+    // disallow return/throw/break/continue inside finally blocks
+    // http://eslint.org/docs/rules/no-unsafe-finally
+    'no-unsafe-finally': 2,
+
     // disallow comparisons with the value NaN
     'use-isnan': 2,
+
     // ensure JSDoc comments are valid
+    // http://eslint.org/docs/rules/valid-jsdoc
     '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
+    'valid-typeof': 2
   }
 };

packages/eslint-config-airbnb-base/rules/es6.js

@@ -0,0 +1,145 @@
+module.exports = {
+  env: {
+    es6: true
+  },
+  parserOptions: {
+    ecmaVersion: 6,
+    sourceType: 'module',
+    ecmaFeatures: {
+      generators: false,
+      objectLiteralDuplicateProperties: false
+    }
+  },
+
+  rules: {
+    // enforces no braces where they can be omitted
+    // http://eslint.org/docs/rules/arrow-body-style
+    'arrow-body-style': [2, 'as-needed'],
+
+    // require parens in arrow function arguments
+    'arrow-parens': 0,
+
+    // require space before/after arrow function's arrow
+    // http://eslint.org/docs/rules/arrow-spacing
+    'arrow-spacing': [2, { before: true, after: true }],
+
+    // verify super() callings in constructors
+    'constructor-super': 2,
+
+    // enforce the spacing around the * in generator functions
+    // http://eslint.org/docs/rules/generator-star-spacing
+    'generator-star-spacing': [2, { before: false, after: true }],
+
+    // disallow modifying variables of class declarations
+    // http://eslint.org/docs/rules/no-class-assign
+    'no-class-assign': 2,
+
+    // 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 duplicate class members
+    // http://eslint.org/docs/rules/no-dupe-class-members
+    'no-dupe-class-members': 2,
+
+    // disallow importing from the same path more than once
+    // http://eslint.org/docs/rules/no-duplicate-imports
+    'no-duplicate-imports': 2,
+
+    // disallow symbol constructor
+    // http://eslint.org/docs/rules/no-new-symbol
+    'no-new-symbol': 2,
+
+    // 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.
+    // http://eslint.org/docs/rules/no-this-before-super
+    'no-this-before-super': 2,
+
+    // disallow useless computed property keys
+    // http://eslint.org/docs/rules/no-useless-computed-key
+    'no-useless-computed-key': 2,
+
+    // disallow unnecessary constructor
+    // http://eslint.org/docs/rules/no-useless-constructor
+    'no-useless-constructor': 2,
+
+    // disallow renaming import, export, and destructured assignments to the same name
+    // http://eslint.org/docs/rules/no-useless-rename
+    'no-useless-rename': [2, {
+      ignoreDestructuring: false,
+      ignoreImport: false,
+      ignoreExport: false,
+    }],
+
+    // require let or const instead of var
+    'no-var': 2,
+
+    // require method and property shorthand syntax for object literals
+    // http://eslint.org/docs/rules/object-shorthand
+    'object-shorthand': [2, 'always', {
+      ignoreConstructors: false,
+      avoidQuotes: true,
+    }],
+
+    // suggest using arrow functions as callbacks
+    'prefer-arrow-callback': [2, {
+      allowNamedFunctions: false,
+      allowUnboundThis: true,
+    }],
+
+    // suggest using of const declaration for variables that are never modified after declared
+    'prefer-const': [2, {
+      destructuring: 'any',
+      ignoreReadBeforeAssign: true,
+    }],
+
+    // suggest using Reflect methods where applicable
+    // http://eslint.org/docs/rules/prefer-reflect
+    // TODO: enable
+    'prefer-reflect': 0,
+
+    // use rest parameters instead of arguments
+    // http://eslint.org/docs/rules/prefer-rest-params
+    'prefer-rest-params': 2,
+
+    // suggest using the spread operator instead of .apply()
+    // http://eslint.org/docs/rules/prefer-spread
+    'prefer-spread': 2,
+
+    // suggest using template literals instead of string concatenation
+    // http://eslint.org/docs/rules/prefer-template
+    'prefer-template': 2,
+
+    // disallow generator functions that do not have yield
+    // http://eslint.org/docs/rules/require-yield
+    'require-yield': 2,
+
+    // enforce spacing between object rest-spread
+    // http://eslint.org/docs/rules/rest-spread-spacing
+    'rest-spread-spacing': [2, 'never'],
+
+    // import sorting
+    // http://eslint.org/docs/rules/sort-imports
+    'sort-imports': [0, {
+      ignoreCase: false,
+      ignoreMemberSort: false,
+      memberSyntaxSortOrder: ['none', 'all', 'multiple', 'single'],
+    }],
+
+    // 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']
+  }
+};

packages/eslint-config-airbnb-base/rules/imports.js

@@ -0,0 +1,132 @@
+module.exports = {
+  env: {
+    es6: true
+  },
+  parserOptions: {
+    ecmaVersion: 6,
+    sourceType: 'module'
+  },
+  plugins: [
+    'import'
+  ],
+
+  settings: {
+    'import/resolver': {
+      node: {
+        extensions: ['.js', '.json']
+      }
+    },
+    'import/extensions': [
+      'node_modules',
+    ],
+    'import/core-modules': [
+    ],
+    'import/ignore': [
+      'node_modules',
+      '\\.(coffee|scss|css|less|hbs|svg|json)$',
+    ],
+  },
+
+  rules: {
+    // Static analysis:
+
+    // ensure imports point to files/modules that can be resolved
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unresolved.md
+    'import/no-unresolved': [2, { commonjs: true }],
+
+    // ensure named imports coupled with named exports
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/named.md#when-not-to-use-it
+    'import/named': 0,
+
+    // ensure default import coupled with default export
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/default.md#when-not-to-use-it
+    'import/default': 0,
+
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/namespace.md
+    'import/namespace': 0,
+
+    // Helpful warnings:
+
+    // disallow invalid exports, e.g. multiple defaults
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/export.md
+    'import/export': 2,
+
+    // do not allow a default import name to match a named export
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-as-default.md
+    'import/no-named-as-default': 2,
+
+    // warn on accessing default export property names that are also named exports
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-as-default-member.md
+    'import/no-named-as-default-member': 2,
+
+    // disallow use of jsdoc-marked-deprecated imports
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-deprecated.md
+    'import/no-deprecated': 0,
+
+    // Forbid the use of extraneous packages
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-extraneous-dependencies.md
+    'import/no-extraneous-dependencies': [2, {
+      devDependencies: false,
+      optionalDependencies: false,
+    }],
+
+    // Forbid mutable exports
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-mutable-exports.md
+    'import/no-mutable-exports': 2,
+
+    // Module systems:
+
+    // disallow require()
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-commonjs.md
+    'import/no-commonjs': 0,
+
+    // disallow AMD require/define
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-amd.md
+    'import/no-amd': 2,
+
+    // No Node.js builtin modules
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-nodejs-modules.md
+    // TODO: enable?
+    'import/no-nodejs-modules': 0,
+
+    // Style guide:
+
+    // disallow non-import statements appearing before import statements
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/imports-first.md
+    'import/imports-first': [2, 'absolute-first'],
+
+    // disallow duplicate imports
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
+    'import/no-duplicates': 2,
+
+    // disallow namespace imports
+    // TODO: enable?
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-namespace.md
+    'import/no-namespace': 0,
+
+    // Ensure consistent use of file extension within the import path
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/extensions.md
+    // TODO: enable when https://github.com/benmosher/eslint-plugin-import/issues/390 is resolved
+    'import/extensions': [0, 'never'],
+
+    // Enforce a convention in module import order
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/order.md
+    // TODO: enable?
+    'import/order': [0, {
+      groups: ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
+      'newlines-between': 'never',
+    }],
+
+    // Require a newline after the last import/require in a group
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/newline-after-import.md
+    'import/newline-after-import': 2,
+
+    // Require modules with a single export to use a default export
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/prefer-default-export.md
+    'import/prefer-default-export': 2,
+
+    // Restrict which files can be imported in a given folder
+    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-restricted-paths.md
+    'import/no-restricted-paths': 0,
+  },
+};

packages/eslint-config-airbnb-base/rules/node.js

@@ -1,23 +1,39 @@
 module.exports = {
-  'env': {
-    'node': true
+  env: {
+    node: true
   },
-  'rules': {
+
+  rules: {
     // enforce return after a callback
     'callback-return': 0,
+
+    // require all requires be top-level
+    // http://eslint.org/docs/rules/global-require
+    'global-require': 2,
+
     // 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,
+    'no-new-require': 2,
+
     // disallow string concatenation with __dirname and __filename
-    'no-path-concat': 0,
+    // http://eslint.org/docs/rules/no-path-concat
+    'no-path-concat': 2,
+
+    // disallow use of process.env
+    'no-process-env': 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
+    'no-sync': 0,
   }
 };

packages/eslint-config-airbnb-base/rules/strict.js

@@ -1,6 +1,6 @@
 module.exports = {
-  'rules': {
+  rules: {
     // babel inserts `'use strict';` for us
-    'strict': [2, 'never']
+    strict: [2, 'never']
   }
 };

packages/eslint-config-airbnb-base/rules/style.js

@@ -0,0 +1,305 @@
+module.exports = {
+  rules: {
+    // enforce spacing inside array brackets
+    'array-bracket-spacing': [2, 'never'],
+
+    // enforce spacing inside single-line blocks
+    // http://eslint.org/docs/rules/block-spacing
+    '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'],
+
+    // disallow padding inside computed properties
+    'computed-property-spacing': [2, 'never'],
+
+    // enforces consistent naming when capturing the current execution context
+    'consistent-this': 0,
+
+    // enforce newline at the end of file, with no multiple empty lines
+    'eol-last': 2,
+
+    // require function expressions to have a name
+    'func-names': 1,
+
+    // enforces use of function declarations or expressions
+    'func-style': 0,
+
+    // Blacklist certain identifiers to prevent them being used
+    // http://eslint.org/docs/rules/id-blacklist
+    'id-blacklist': 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,
+
+    // this option sets a specific tab width for your code
+    // http://eslint.org/docs/rules/indent
+    indent: [2, 2, { SwitchCase: 1, VariableDeclarator: 1, outerIIFEBody: 1 }],
+
+    // specify whether double or single quotes should be used in JSX attributes
+    // http://eslint.org/docs/rules/jsx-quotes
+    'jsx-quotes': [0, 'prefer-double'],
+
+    // enforces spacing between keys and values in object literal properties
+    'key-spacing': [2, { beforeColon: false, afterColon: true }],
+
+    // require a space before & after certain keywords
+    'keyword-spacing': [2, {
+      before: true,
+      after: true,
+      overrides: {
+        return: { after: true },
+        throw: { after: true },
+        case: { after: true }
+      }
+    }],
+
+    // disallow mixed 'LF' and 'CRLF' as linebreaks
+    // http://eslint.org/docs/rules/linebreak-style
+    'linebreak-style': [2, 'unix'],
+
+    // enforces empty lines around comments
+    'lines-around-comment': 0,
+
+    // specify the maximum depth that blocks can be nested
+    'max-depth': [0, 4],
+
+    // specify the maximum length of a line in your program
+    // http://eslint.org/docs/rules/max-len
+    'max-len': [2, 100, 2, {
+      ignoreUrls: true,
+      ignoreComments: false
+    }],
+
+    // specify the max number of lines in a file
+    // http://eslint.org/docs/rules/max-lines
+    'max-lines': [0, {
+      max: 300,
+      skipBlankLines: true,
+      skipComments: true
+    }],
+
+    // specify the maximum depth callbacks can be nested
+    'max-nested-callbacks': 0,
+
+    // 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],
+
+    // restrict the number of statements per line
+    // http://eslint.org/docs/rules/max-statements-per-line
+    'max-statements-per-line': [0, { max: 1 }],
+
+    // require multiline ternary
+    // http://eslint.org/docs/rules/multiline-ternary
+    'multiline-ternary': 0,
+
+    // require a capital letter for constructors
+    'new-cap': [2, { newIsCap: true }],
+
+    // disallow the omission of parentheses when invoking a constructor with no arguments
+    // http://eslint.org/docs/rules/new-parens
+    'new-parens': 2,
+
+    // allow/disallow an empty newline after var statement
+    'newline-after-var': 0,
+
+    // http://eslint.org/docs/rules/newline-before-return
+    'newline-before-return': 0,
+
+    // enforces new line after each method call in the chain to make it
+    // more readable and easy to maintain
+    // http://eslint.org/docs/rules/newline-per-chained-call
+    'newline-per-chained-call': [2, { ignoreChainWithDepth: 4 }],
+
+    // disallow use of the Array constructor
+    'no-array-constructor': 2,
+
+    // disallow use of bitwise operators
+    // http://eslint.org/docs/rules/no-bitwise
+    // TODO: enable
+    'no-bitwise': 0,
+
+    // disallow use of the continue statement
+    // http://eslint.org/docs/rules/no-continue
+    'no-continue': 2,
+
+    // disallow comments inline after code
+    'no-inline-comments': 0,
+
+    // disallow if as the only statement in an else block
+    // http://eslint.org/docs/rules/no-lonely-if
+    'no-lonely-if': 2,
+
+    // disallow un-paren'd mixes of different operators
+    // http://eslint.org/docs/rules/no-mixed-operators
+    'no-mixed-operators': [2, {
+      groups: [
+        ['+', '-', '*', '/', '%', '**'],
+        ['&', '|', '^', '~', '<<', '>>', '>>>'],
+        ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
+        ['&&', '||'],
+        ['in', 'instanceof']
+      ],
+      allowSamePrecedence: false
+    }],
+
+    // disallow mixed spaces and tabs for indentation
+    'no-mixed-spaces-and-tabs': 2,
+
+    // disallow multiple empty lines and only one newline at the end
+    'no-multiple-empty-lines': [2, { max: 2, maxEOF: 1 }],
+
+    // disallow negated conditions
+    // http://eslint.org/docs/rules/no-negated-condition
+    'no-negated-condition': 0,
+
+    // disallow nested ternary expressions
+    'no-nested-ternary': 2,
+
+    // disallow use of the Object constructor
+    'no-new-object': 2,
+
+    // disallow use of unary operators, ++ and --
+    'no-plusplus': 0,
+
+    // disallow certain syntax forms
+    // http://eslint.org/docs/rules/no-restricted-syntax
+    'no-restricted-syntax': [
+      2,
+      'DebuggerStatement',
+      'ForInStatement',
+      'LabeledStatement',
+      'WithStatement',
+    ],
+
+    // disallow space between function identifier and application
+    'no-spaced-func': 2,
+
+    // disallow tab characters entirely
+    // TODO: enable
+    'no-tabs': 0,
+
+    // disallow the use of ternary operators
+    'no-ternary': 0,
+
+    // disallow trailing whitespace at the end of lines
+    'no-trailing-spaces': 2,
+
+    // disallow dangling underscores in identifiers
+    'no-underscore-dangle': [2, { allowAfterThis: false }],
+
+    // disallow the use of Boolean literals in conditional expressions
+    // also, prefer `a || b` over `a ? a : b`
+    // http://eslint.org/docs/rules/no-unneeded-ternary
+    'no-unneeded-ternary': [2, { defaultAssignment: false }],
+
+    // disallow whitespace before properties
+    // http://eslint.org/docs/rules/no-whitespace-before-property
+    'no-whitespace-before-property': 2,
+
+    // require padding inside curly braces
+    'object-curly-spacing': [2, 'always'],
+
+    // enforce line breaks between braces
+    // http://eslint.org/docs/rules/object-curly-newline
+    // TODO: enable once https://github.com/eslint/eslint/issues/6488 is resolved
+    'object-curly-newline': [0, {
+      ObjectExpression: { minProperties: 0, multiline: true },
+      ObjectPattern: { minProperties: 0, multiline: true }
+    }],
+
+    // enforce "same line" or "multiple line" on object properties.
+    // http://eslint.org/docs/rules/object-property-newline
+    'object-property-newline': [2, {
+      allowMultiplePropertiesPerLine: true,
+    }],
+
+    // allow just one var statement per function
+    'one-var': [2, 'never'],
+
+    // require a newline around variable declaration
+    // http://eslint.org/docs/rules/one-var-declaration-per-line
+    'one-var-declaration-per-line': [2, 'always'],
+
+    // require assignment operator shorthand where possible or prohibit it entirely
+    // http://eslint.org/docs/rules/operator-assignment
+    'operator-assignment': [2, 'always'],
+
+    // enforce operators to be placed before or after line breaks
+    'operator-linebreak': 0,
+
+    // enforce padding within blocks
+    'padded-blocks': [2, 'never'],
+
+    // require quotes around object literal property names
+    // http://eslint.org/docs/rules/quote-props.html
+    'quote-props': [2, 'as-needed', { keywords: false, unnecessary: true, numbers: false }],
+
+    // specify whether double or single quotes should be used
+    quotes: [2, 'single', { avoidEscape: true }],
+
+    // do not require jsdoc
+    // http://eslint.org/docs/rules/require-jsdoc
+    'require-jsdoc': 0,
+
+    // require or disallow use of semicolons instead of ASI
+    semi: [2, 'always'],
+
+    // enforce spacing before and after semicolons
+    'semi-spacing': [2, { before: false, after: true }],
+
+    // sort variables within the same declaration block
+    'sort-vars': 0,
+
+    // require or disallow space before blocks
+    'space-before-blocks': 2,
+
+    // require or disallow space before function opening parenthesis
+    // http://eslint.org/docs/rules/space-before-function-paren
+    'space-before-function-paren': [2, { anonymous: 'always', named: 'never' }],
+
+    // require or disallow spaces inside parentheses
+    'space-in-parens': [2, 'never'],
+
+    // require spaces around operators
+    'space-infix-ops': 2,
+
+    // Require or disallow spaces before/after unary operators
+    // http://eslint.org/docs/rules/space-unary-ops
+    'space-unary-ops': [2, {
+      words: true,
+      nonwords: false,
+      overrides: {
+      },
+    }],
+
+    // require or disallow a space immediately following the // or /* in a comment
+    'spaced-comment': [2, 'always', {
+      exceptions: ['-', '+'],
+      markers: ['=', '!']           // space here to support sprockets directives
+    }],
+
+    // require or disallow the Unicode Byte Order Mark
+    // http://eslint.org/docs/rules/unicode-bom
+    'unicode-bom': [2, 'never'],
+
+    // require regex literals to be wrapped in parentheses
+    'wrap-regex': 0
+  }
+};

packages/eslint-config-airbnb-base/rules/variables.js

@@ -1,25 +1,40 @@
 module.exports = {
-  'rules': {
+  rules: {
     // 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 labels that share a name with a variable
-    'no-label-var': 0,
-    // disallow shadowing of names such as arguments
-    'no-shadow-restricted-names': 2,
+    // http://eslint.org/docs/rules/no-label-var
+    'no-label-var': 2,
+
+    // disallow specific globals
+    'no-restricted-globals': 0,
+
     // 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 shadowing of names such as arguments
+    'no-shadow-restricted-names': 2,
+
     // disallow use of undeclared variables unless mentioned in a /*global */ block
     'no-undef': 2,
+
+    // disallow use of undefined when initializing variables
+    'no-undef-init': 2,
+
     // disallow use of undefined variable
+    // TODO: enable?
     'no-undefined': 0,
+
     // disallow declaration of variables that are not used in the code
-    'no-unused-vars': [2, {'vars': 'local', 'args': 'after-used'}],
+    'no-unused-vars': [2, { vars: 'local', args: 'after-used' }],
+
     // disallow use of variables before they are defined
     'no-use-before-define': 2
   }

packages/eslint-config-airbnb-base/test/.eslintrc

@@ -0,0 +1,12 @@
+{
+  "rules": {
+    // disabled because I find it tedious to write tests while following this
+    // rule
+    "no-shadow": 0,
+    // tests uses `t` for tape
+    "id-length": [2, {"min": 2, "properties": "never", "exceptions": ["t"]}],
+    "import/no-extraneous-dependencies": [2, {
+      "devDependencies": true
+    }],
+  }
+}

packages/eslint-config-airbnb-base/test/test-base.js

@@ -0,0 +1,29 @@
+import fs from 'fs';
+import path from 'path';
+import test from 'tape';
+
+import index from '../';
+
+const files = { index };
+
+fs.readdirSync(path.join(__dirname, '../rules')).forEach(name => {
+  files[name] = require(`../rules/${name}`); // eslint-disable-line global-require
+});
+
+Object.keys(files).forEach(name => {
+  const config = files[name];
+
+  test(`${name}: does not reference react`, t => {
+    t.plan(2);
+
+    // scan plugins for react and fail if it is found
+    const hasReactPlugin = Object.prototype.hasOwnProperty.call(config, 'plugins') &&
+      config.plugins.indexOf('react') !== -1;
+    t.notOk(hasReactPlugin, 'there is no react plugin');
+
+    // scan rules for react/ and fail if any exist
+    const reactRuleIds = Object.keys(config.rules)
+      .filter(ruleId => ruleId.indexOf('react/') === 0);
+    t.deepEquals(reactRuleIds, [], 'there are no react/ rules');
+  });
+});

packages/eslint-config-airbnb/.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["airbnb"]
+}

packages/eslint-config-airbnb/.eslintrc

@@ -1,5 +1,5 @@
 {
-  "extends": "airbnb",
+  "extends": "./index.js",
   "rules": {
     // disable requiring trailing commas because it might be nice to revert to
     // being JSON at some point, and I don't want to make big changes now.

packages/eslint-config-airbnb/CHANGELOG.md

@@ -1,76 +1,228 @@
+9.0.1 / 2016-05-08
+==================
+- [patch] update `eslint-config-airbnb-base` to v3.0.1
+
+9.0.0 / 2016-05-07
+==================
+- [breaking] update `eslint-config-airbnb-base` to v3
+- [deps] update `eslint-find-rules`, `eslint-plugin-import`, `eslint-plugin-jsx-a11y`
+
+8.0.0 / 2016-04-21
+==================
+- [breaking] Migrate non-React rules to a separate linter config (`eslint-config-airbnb-base`)
+- [breaking] disallow empty methods
+- [breaking] disallow empty restructuring patterns
+- [breaking] enable `no-restricted-syntax` rule
+- [breaking] enable `global-require` rule
+- [breaking] [react] enable `react/jsx-curly-spacing` rule ([#693](https://github.com/airbnb/javascript/issues/693))
+- [semver-minor] [react] Add `react/jsx-first-prop-new-line` rule
+- [semver-minor] [react] enable `jsx-equals-spacing` rule
+- [semver-minor] [react] enable `jsx-indent` rule
+- [semver-minor] enforce spacing inside single-line blocks
+- [semver-minor] enforce `no-underscore-dangle`
+- [semver-minor] Enable import/no-unresolved and import/export rules ([#825](https://github.com/airbnb/javascript/issues/825))
+- [semver-patch] Enable `no-useless-concat` rule which `prefer-template` already covers
+- [semver-patch] Allow `== null` ([#542](https://github.com/airbnb/javascript/issues/542))
+- [dev deps / peer deps] update `eslint`, `eslint-plugin-react`, `eslint-plugin-import`
+- [dev deps / peer deps] update `eslint-plugin-jsx-a11y` and rename rules ([#838](https://github.com/airbnb/javascript/issues/838))
+- [refactor] [react] separate a11y rules to their own file
+- [refactor] Add missing disabled rules.
+- [tests] Add `eslint-find-rules` to prevent missing rules
+
+7.0.0 / 2016-04-11
+==================
+- [react] [breaking] Add accessibility rules to the React style guide + `eslint-plugin-a11y`
+- [breaking] enable `react/require-render-return`
+- [breaking] Add `no-dupe-class-members` rule + section ([#785](https://github.com/airbnb/javascript/issues/785))
+- [breaking] error on debugger statements
+- [breaking] add `no-useless-escape` rule
+- [breaking] add `no-duplicate-imports` rule
+- [semver-minor] enable `jsx-pascal-case` rule
+- [deps] update `eslint`, `react`
+- [dev deps] update `eslint`, `eslint-plugin-react`
+
+6.2.0 / 2016-03-22
+==================
+- [new] Allow arrow functions in JSX props
+- [fix] re-enable `no-confusing-arrow` rule, with `allowParens` option enabled ([#752](https://github.com/airbnb/javascript/issues/752), [#791](https://github.com/airbnb/javascript/issues/791))
+- [dev deps] update `tape`, `eslint`, `eslint-plugin-react`
+- [peer deps] update `eslint`, `eslint-plugin-react`
+
+6.1.0 / 2016-02-22
+==================
+- [new] enable [`react/prefer-stateless-function`][react/prefer-stateless-function]
+- [dev deps] update `react-plugin-eslint`, `eslint`, `tape`
+
+6.0.2 / 2016-02-22
+==================
+- [fix] disable [`no-confusing-arrow`][no-confusing-arrow] due to an `eslint` bug ([#752](https://github.com/airbnb/javascript/issues/752))
+
+6.0.1 / 2016-02-21
+==================
+- [fix] disable [`newline-per-chained-call`][newline-per-chained-call] due to an `eslint` bug ([#748](https://github.com/airbnb/javascript/issues/748))
+
+6.0.0 / 2016-02-21
+==================
+- [breaking] enable [`array-callback-return`][array-callback-return]
+- [breaking] enable [`no-confusing-arrow`][no-confusing-arrow]
+- [breaking] enable [`no-new-symbol`][no-new-symbol]
+- [breaking] enable [`no-restricted-imports`][no-restricted-imports]
+- [breaking] enable [`no-useless-constructor`][no-useless-constructor]
+- [breaking] enable [`prefer-rest-params`][prefer-rest-params]
+- [breaking] enable [`template-curly-spacing`][template-curly-spacing]
+- [breaking] enable [`newline-per-chained-call`][newline-per-chained-call]
+- [breaking] enable [`one-var-declaration-per-line`][one-var-declaration-per-line]
+- [breaking] enable [`no-self-assign`][no-self-assign]
+- [breaking] enable [`no-whitespace-before-property`][no-whitespace-before-property]
+- [breaking] [react] enable [`react/jsx-space-before-closing`][react/jsx-space-before-closing]
+- [breaking] [react] enable `static-methods` at top of [`react/sort-comp`][react/sort-comp]
+- [breaking] [react] don't `ignoreTranspilerName` for [`react/display-name`][react/display-name]
+- [peer+dev deps] update `eslint`, `eslint-plugin-react` ([#730](https://github.com/airbnb/javascript/issues/730))
+
+5.0.1 / 2016-02-13
+==================
+- [fix] `eslint` peerDep should not include breaking changes
+
+5.0.0 / 2016-02-03
+==================
+- [breaking] disallow unneeded ternary expressions
+- [breaking] Avoid lexical declarations in case/default clauses
+- [dev deps] update `babel-tape-runner`, `eslint-plugin-react`, `react`, `tape`
+
+4.0.0 / 2016-01-22
+==================
+- [breaking] require outer IIFE wrapping; flesh out guide section
+- [minor] Add missing [`arrow-body-style`][arrow-body-style], [`prefer-template`][prefer-template] rules ([#678](https://github.com/airbnb/javascript/issues/678))
+- [minor] Add [`prefer-arrow-callback`][prefer-arrow-callback] to ES6 rules (to match the guide) ([#677](https://github.com/airbnb/javascript/issues/677))
+- [Tests] run `npm run lint` as part of tests; fix errors
+- [Tests] use `parallelshell` to parallelize npm run-scripts
+
+3.1.0 / 2016-01-07
+==================
+- [minor] Allow multiple stateless components in a single file
+
+3.0.2 / 2016-01-06
+==================
+- [fix] Ignore URLs in [`max-len`][max-len] ([#664](https://github.com/airbnb/javascript/issues/664))
+
+3.0.1 / 2016-01-06
+==================
+- [fix] because we use babel, keywords should not be quoted
+
 3.0.0 / 2016-01-04
 ==================
- - [breaking] enable `quote-props` rule (#632)
- - [breaking] Define a max line length of 100 characters (#639)
- - [breaking] [react] Minor cleanup for the React styleguide, add `react/jsx-no-bind` (#619)
- - [breaking] update best-practices config to prevent parameter object manipulation (#627)
- - [minor] Enable react/no-is-mounted rule (#635, #633)
- - [minor] Sort react/prefer-es6-class alphabetically (#634)
- - [minor] enable react/prefer-es6-class rule
- - Permit strict mode in "legacy" config
- - [react] add missing rules from eslint-plugin-react (enforcing where necessary) (#581)
- - [dev deps] update `eslint-plugin-react`
+- [breaking] enable [`quote-props`][quote-props] rule ([#632](https://github.com/airbnb/javascript/issues/632))
+- [breaking] Define a max line length of 100 characters ([#639](https://github.com/airbnb/javascript/issues/639))
+- [breaking] [react] Minor cleanup for the React styleguide, add [`react/jsx-no-bind`][react/jsx-no-bind] ([#619](https://github.com/airbnb/javascript/issues/619))
+- [breaking] update best-practices config to prevent parameter object manipulation ([#627](https://github.com/airbnb/javascript/issues/627))
+- [minor] Enable [`react/no-is-mounted`][react/no-is-mounted] rule (#635, #633)
+- [minor] Sort [`react/prefer-es6-class`][react/prefer-es6-class] alphabetically ([#634](https://github.com/airbnb/javascript/issues/634))
+- [minor] enable [`react/prefer-es6-class`][react/prefer-es6-class] rule
+- Permit strict mode in "legacy" config
+- [react] add missing rules from `eslint-plugin-react` (enforcing where necessary) ([#581](https://github.com/airbnb/javascript/issues/581))
+- [dev deps] update `eslint-plugin-react`
 
 2.1.1 / 2015-12-15
 ==================
- - [fix] Remove deprecated react/jsx-quotes (#622)
+- [fix] Remove deprecated [`react/jsx-quotes`][react/jsx-quotes] ([#622](https://github.com/airbnb/javascript/issues/622))
 
 2.1.0 / 2015-12-15
 ==================
- - [fix] use `require.resolve` to allow nested `extend`s (#582)
- - [new] enable `object-shorthand` rule (#621)
- - [new] enable `arrow-spacing` rule (#517)
- - [docs] flesh out react rule defaults (#618)
+- [fix] use `require.resolve` to allow nested `extend`s ([#582](https://github.com/airbnb/javascript/issues/582))
+- [new] enable [`object-shorthand`][object-shorthand] rule ([#621](https://github.com/airbnb/javascript/issues/621))
+- [new] enable [`arrow-spacing`][arrow-spacing] rule ([#517](https://github.com/airbnb/javascript/issues/517))
+- [docs] flesh out react rule defaults ([#618](https://github.com/airbnb/javascript/issues/618))
 
 2.0.0 / 2015-12-03
 ==================
- - [breaking] `space-before-function-paren`: require function spacing: `function <optional name>(` (#605)
- - [breaking] `indent`: Fix switch statement indentation rule (#606)
- - [breaking] `array-bracket-spacing`, `computed-property-spacing`: disallow spacing inside brackets (#594)
- - [breaking] `object-curly-spacing`: require padding inside curly braces (#594)
- - [breaking] `space-in-parens`: disallow spaces in parens (#594)
+- [breaking] [`space-before-function-paren`][space-before-function-paren]: require function spacing: `function <optional name>(` ([#605](https://github.com/airbnb/javascript/issues/605))
+- [breaking] [`indent`][indent]: Fix switch statement indentation rule ([#606](https://github.com/airbnb/javascript/issues/606))
+- [breaking] [`array-bracket-spacing`][array-bracket-spacing], [`computed-property-spacing`][computed-property-spacing]: disallow spacing inside brackets ([#594](https://github.com/airbnb/javascript/issues/594))
+- [breaking] [`object-curly-spacing`][object-curly-spacing]: require padding inside curly braces ([#594](https://github.com/airbnb/javascript/issues/594))
+- [breaking] [`space-in-parens`][space-in-parens]: disallow spaces in parens ([#594](https://github.com/airbnb/javascript/issues/594))
 
 1.0.2 / 2015-11-25
 ==================
- - [breaking] `no-multiple-empty-lines`: only allow 1 blank line at EOF (#578)
- - [new] `restParams`: enable rest params (#592)
+- [breaking] [`no-multiple-empty-lines`][no-multiple-empty-lines]: only allow 1 blank line at EOF ([#578](https://github.com/airbnb/javascript/issues/578))
+- [new] `restParams`: enable rest params ([#592](https://github.com/airbnb/javascript/issues/592))
 
 1.0.1 / 2015-11-25
 ==================
- - *erroneous publish*
+- *erroneous publish*
 
 1.0.0 / 2015-11-08
 ==================
- - require `eslint` `v1.0.0` or higher
- - remove `babel-eslint` dependency
+- require `eslint` `v1.0.0` or higher
+- remove `babel-eslint` dependency
 
 0.1.1 / 2015-11-05
 ==================
- - remove id-length rule (#569)
- - enable `no-mixed-spaces-and-tabs` (#539)
- - enable `no-const-assign` (#560)
- - enable `space-before-keywords` (#554)
+- remove [`id-length`][id-length] rule ([#569](https://github.com/airbnb/javascript/issues/569))
+- enable [`no-mixed-spaces-and-tabs`][no-mixed-spaces-and-tabs] ([#539](https://github.com/airbnb/javascript/issues/539))
+- enable [`no-const-assign`][no-const-assign] ([#560](https://github.com/airbnb/javascript/issues/560))
+- enable [`space-before-keywords`][space-before-keywords] ([#554](https://github.com/airbnb/javascript/issues/554))
 
 0.1.0 / 2015-11-05
 ==================
- - switch to modular rules files courtesy the [eslint-config-default][ecd] project and [@taion][taion]. [PR][pr-modular]
- - export `eslint-config-airbnb/legacy` for ES5-only users. `eslint-config-airbnb/legacy` does not require the `babel-eslint` parser. [PR][pr-legacy]
+- switch to modular rules files courtesy the [eslint-config-default][ecd] project and [@taion][taion]. [PR][pr-modular]
+- export `eslint-config-airbnb/legacy` for ES5-only users. `eslint-config-airbnb/legacy` does not require the `babel-eslint` parser. [PR][pr-legacy]
 
 0.0.9 / 2015-09-24
 ==================
-- add rule `no-undef`
-- add rule `id-length`
+- add rule [`no-undef`][no-undef]
+- add rule [`id-length`][id-length]
 
 0.0.8 / 2015-08-21
 ==================
- - now has a changelog
- - now is modular (see instructions above for with react and without react versions)
+- now has a changelog
+- now is modular (see instructions above for with react and without react versions)
 
 0.0.7 / 2015-07-30
 ==================
- - TODO: fill in
+- TODO: fill in
+
 
 [ecd]: https://github.com/walmartlabs/eslint-config-defaults
 [taion]: https://github.com/taion
 [pr-modular]: https://github.com/airbnb/javascript/pull/526
 [pr-legacy]: https://github.com/airbnb/javascript/pull/527
+
+[array-bracket-spacing]: http://eslint.org/docs/rules/array-bracket-spacing
+[array-callback-return]: http://eslint.org/docs/rules/array-callback-return
+[arrow-body-style]: http://eslint.org/docs/rules/arrow-body-style
+[arrow-spacing]: http://eslint.org/docs/rules/arrow-spacing
+[computed-property-spacing]: http://eslint.org/docs/rules/computed-property-spacing
+[id-length]: http://eslint.org/docs/rules/id-length
+[indent]: http://eslint.org/docs/rules/indent
+[max-len]: http://eslint.org/docs/rules/max-len
+[newline-per-chained-call]: http://eslint.org/docs/rules/newline-per-chained-call
+[no-confusing-arrow]: http://eslint.org/docs/rules/no-confusing-arrow
+[no-const-assign]: http://eslint.org/docs/rules/no-const-assign
+[no-mixed-spaces-and-tabs]: http://eslint.org/docs/rules/no-mixed-spaces-and-tabs
+[no-multiple-empty-lines]: http://eslint.org/docs/rules/no-multiple-empty-lines
+[no-new-symbol]: http://eslint.org/docs/rules/no-new-symbol
+[no-restricted-imports]: http://eslint.org/docs/rules/no-restricted-imports
+[no-self-assign]: http://eslint.org/docs/rules/no-self-assign
+[no-undef]: http://eslint.org/docs/rules/no-undef
+[no-useless-constructor]: http://eslint.org/docs/rules/no-useless-constructor
+[no-whitespace-before-property]: http://eslint.org/docs/rules/no-whitespace-before-property
+[object-curly-spacing]: http://eslint.org/docs/rules/object-curly-spacing
+[object-shorthand]: http://eslint.org/docs/rules/object-shorthand
+[one-var-declaration-per-line]: http://eslint.org/docs/rules/one-var-declaration-per-line
+[prefer-arrow-callback]: http://eslint.org/docs/rules/prefer-arrow-callback
+[prefer-rest-params]: http://eslint.org/docs/rules/prefer-rest-params
+[prefer-template]: http://eslint.org/docs/rules/prefer-template
+[quote-props]: http://eslint.org/docs/rules/quote-props
+[space-before-function-paren]: http://eslint.org/docs/rules/space-before-function-paren
+[space-before-keywords]: http://eslint.org/docs/rules/space-before-keywords
+[space-in-parens]: http://eslint.org/docs/rules/space-in-parens
+[template-curly-spacing]: http://eslint.org/docs/rules/template-curly-spacing
+
+[react/jsx-space-before-closing]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-space-before-closing.md
+[react/sort-comp]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md
+[react/display-name]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/display-name.md
+[react/jsx-no-bind]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md
+[react/no-is-mounted]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-is-mounted.md
+[react/prefer-es6-class]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-es6-class.md
+[react/jsx-quotes]: https://github.com/yannickcr/eslint-plugin-react/blob/f817e37beddddc84b4788969f07c524fa7f0823b/docs/rules/jsx-quotes.md
+[react/prefer-stateless-function]: https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-stateless-function.md

packages/eslint-config-airbnb/README.md

@@ -10,25 +10,30 @@ We export three ESLint configurations for your usage.
 
 ### eslint-config-airbnb
 
-Our default export contains all of our ESLint rules, including EcmaScript 6+
-and React. It requires `eslint` and `eslint-plugin-react`.
+Our default export contains all of our ESLint rules, including ECMAScript 6+ and React. It requires `eslint`, `eslint-plugin-import`, `eslint-plugin-react`, and `eslint-plugin-jsx-a11y`.
 
-1. `npm install --save-dev eslint-config-airbnb eslint-plugin-react eslint`
-2. add `"extends": "airbnb"` to your .eslintrc
+1. Ensure packages are installed with correct version numbers by running:
+  ```sh
+  (
+    export PKG=eslint-config-airbnb;
+    npm info "$PKG" peerDependencies --json | command sed 's/[\{\},]//g ; s/: /@/g' | xargs npm install --save-dev "$PKG"
+  )
+  ```
 
+  Which produces and runs a command like:
+
+  ```sh
+  npm install --save-dev eslint-config-airbnb eslint@^2.9.0 eslint-plugin-jsx-a11y@^1.2.0 eslint-plugin-import@^1.7.0 eslint-plugin-react@^5.0.1
+  ```
+
+2. Add `"extends": "airbnb"` to your .eslintrc
 ### eslint-config-airbnb/base
 
-Lints ES6+ but does not lint React. Requires `eslint`.
-
-1. `npm install --save-dev eslint-config-airbnb eslint`
-2. add `"extends": "airbnb/base"` to your .eslintrc
+This entry point is deprecated. See [eslint-config-airbnb-base](https://npmjs.com/eslint-config-airbnb-base).
 
 ### eslint-config-airbnb/legacy
 
-Lints ES5 and below. Only requires `eslint`.
-
-1. `npm install --save-dev eslint-config-airbnb eslint`
-2. add `"extends": "airbnb/legacy"` to your .eslintrc
+This entry point is deprecated. See [eslint-config-airbnb-base](https://npmjs.com/eslint-config-airbnb-base).
 
 See [Airbnb's Javascript styleguide](https://github.com/airbnb/javascript) and
 the [ESlint config docs](http://eslint.org/docs/user-guide/configuring#extending-configuration-files)
@@ -36,9 +41,7 @@ for more information.
 
 ## Improving this config
 
-Consider adding test cases if you're making complicated rules changes, like
-anything involving regexes. Perhaps in a distant future, we could use literate
-programming to structure our README as test cases for our .eslintrc?
+Consider adding test cases if you're making complicated rules changes, like anything involving regexes. Perhaps in a distant future, we could use literate programming to structure our README as test cases for our .eslintrc?
 
 You can run tests with `npm test`.
 

packages/eslint-config-airbnb/base.js

@@ -1,7 +1,4 @@
 module.exports = {
-  'extends': [
-    'eslint-config-airbnb/legacy',
-    'eslint-config-airbnb/rules/es6',
-  ].map(require.resolve),
-  'rules': {}
+  extends: ['eslint-config-airbnb-base'].map(require.resolve),
+  rules: {},
 };

packages/eslint-config-airbnb/index.js

@@ -1,8 +1,9 @@
 module.exports = {
-  'extends': [
-    'eslint-config-airbnb/base',
-    'eslint-config-airbnb/rules/strict',
-    'eslint-config-airbnb/rules/react',
+  extends: [
+    'eslint-config-airbnb-base',
+    'eslint-config-airbnb-base/rules/strict',
+    './rules/react',
+    './rules/react-a11y',
   ].map(require.resolve),
   rules: {}
 };

packages/eslint-config-airbnb/legacy.js

@@ -1,20 +1,4 @@
 module.exports = {
-  'extends': [
-    'eslint-config-airbnb/rules/best-practices',
-    'eslint-config-airbnb/rules/errors',
-    'eslint-config-airbnb/rules/legacy',
-    'eslint-config-airbnb/rules/node',
-    'eslint-config-airbnb/rules/style',
-    'eslint-config-airbnb/rules/variables'
-  ].map(require.resolve),
-  'env': {
-    'browser': true,
-    'node': true,
-    'amd': false,
-    'mocha': false,
-    'jasmine': false
-  },
-  'ecmaFeatures': {},
-  'globals': {},
-  'rules': {}
+  extends: ['eslint-config-airbnb-base/legacy'].map(require.resolve),
+  rules: {},
 };

packages/eslint-config-airbnb/node_modules/eslint-config-airbnb

@@ -1 +0,0 @@
-..

packages/eslint-config-airbnb/package.json

@@ -1,11 +1,15 @@
 {
   "name": "eslint-config-airbnb",
-  "version": "3.0.0",
+  "version": "9.0.1",
   "description": "Airbnb's ESLint config, following our styleguide",
   "main": "index.js",
   "scripts": {
     "lint": "eslint .",
-    "test": "babel-tape-runner ./test/test-*.js"
+    "tests-only": "babel-tape-runner ./test/test-*.js",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test)",
+    "pretest": "npm run --silent lint",
+    "test": "npm run --silent tests-only",
+    "travis": "cd ../eslint-config-airbnb-base && npm install && npm link && cd - && npm link eslint-config-airbnb-base && npm run --silent test ; npm unlink eslint-config-airbnb-base >/dev/null &"
   },
   "repository": {
     "type": "git",
@@ -29,6 +33,10 @@
       "name": "Jordan Harband",
       "email": "ljharb@gmail.com",
       "url": "http://ljharb.codes"
+    },
+    {
+      "name": "Harrison Shoff",
+      "url": "https://twitter.com/hshoff"
     }
   ],
   "license": "MIT",
@@ -36,14 +44,28 @@
     "url": "https://github.com/airbnb/javascript/issues"
   },
   "homepage": "https://github.com/airbnb/javascript",
+  "dependencies": {
+    "eslint-config-airbnb-base": "^5.0.1"
+  },
   "devDependencies": {
-    "babel-tape-runner": "1.2.0",
-    "eslint": "^1.10.3",
-    "eslint-plugin-react": "^3.12.0",
-    "react": "^0.13.3",
-    "tape": "^4.2.2"
+    "babel-preset-airbnb": "^2.0.0",
+    "babel-tape-runner": "^2.0.1",
+    "eslint": "^3.2.2",
+    "eslint-find-rules": "^1.11.1",
+    "eslint-plugin-import": "^1.12.0",
+    "eslint-plugin-jsx-a11y": "^2.0.1",
+    "eslint-plugin-react": "^6.0.0",
+    "in-publish": "^2.0.0",
+    "react": ">= 0.13.0",
+    "tape": "^4.6.0"
   },
   "peerDependencies": {
-    "eslint": ">=1.0.0"
+    "eslint": "^3.2.2",
+    "eslint-plugin-jsx-a11y": "^2.0.1",
+    "eslint-plugin-import": "^1.12.0",
+    "eslint-plugin-react": "^6.0.0"
+  },
+  "engines": {
+    "node": ">= 4"
   }
 }

packages/eslint-config-airbnb/rules/es6.js

@@ -1,54 +0,0 @@
-module.exports = {
-  'env': {
-    'es6': false
-  },
-  '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,
-    'restParams': true,
-    'spread': true,
-    'superInFunctions': true,
-    'templateStrings': true,
-    'jsx': true
-  },
-  'rules': {
-    // 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 }],
-    // 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 modifying variables that are declared using const
-    'no-const-assign': 2,
-    // disallow to use this/super before super() calling in constructors.
-    'no-this-before-super': 0,
-    // require let or const instead of var
-    'no-var': 2,
-    // require method and property shorthand syntax for object literals
-    // https://github.com/eslint/eslint/blob/master/docs/rules/object-shorthand.md
-    'object-shorthand': [2, 'always'],
-    // 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,
-    // disallow generator functions that do not have yield
-    'require-yield': 0
-  }
-};

packages/eslint-config-airbnb/rules/legacy.js

@@ -1,14 +0,0 @@
-module.exports = {
-  'rules': {
-    // 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
-  }
-};

packages/eslint-config-airbnb/rules/react-a11y.js

@@ -0,0 +1,100 @@
+module.exports = {
+  plugins: [
+    'jsx-a11y',
+    'react'
+  ],
+  ecmaFeatures: {
+    jsx: true
+  },
+  rules: {
+    // Require ARIA roles to be valid and non-abstract
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-role.md
+    'jsx-a11y/aria-role': 2,
+
+    // Enforce all aria-* props are valid.
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-props.md
+    'jsx-a11y/aria-props': 2,
+
+    // Enforce ARIA state and property values are valid.
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-proptypes.md
+    'jsx-a11y/aria-proptypes': 2,
+
+    // Enforce that elements that do not support ARIA roles, states, and
+    // properties do not have those attributes.
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-unsupported-elements.md
+    'jsx-a11y/aria-unsupported-elements': 2,
+
+    // disallow href "#"
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/href-no-hash.md
+    'jsx-a11y/href-no-hash': [2, ['a']],
+
+    // Require <img> to have a non-empty `alt` prop, or role="presentation"
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/img-has-alt.md
+    'jsx-a11y/img-has-alt': 2,
+
+    // Prevent img alt text from containing redundant words like "image", "picture", or "photo"
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/img-redundant-alt.md
+    'jsx-a11y/img-redundant-alt': 2,
+
+    // require that JSX labels use "htmlFor"
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/label-has-for.md
+    'jsx-a11y/label-has-for': [2, ['label']],
+
+    // require that mouseover/out come with focus/blur, for keyboard-only users
+    // TODO: evaluate
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/mouse-events-have-key-events.md
+    'jsx-a11y/mouse-events-have-key-events': 0,
+
+    // Prevent use of `accessKey`
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-access-key.md
+    'jsx-a11y/no-access-key': 2,
+
+    // require onBlur instead of onChange
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-onchange.md
+    'jsx-a11y/no-onchange': 0,
+
+    // Enforce that elements with onClick handlers must be focusable.
+    // TODO: evaluate
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/onclick-has-focus.md
+    'jsx-a11y/onclick-has-focus': 0,
+
+    // require things with onClick to have an aria role
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/onclick-has-role.md
+    'jsx-a11y/onclick-has-role': 0,
+
+    // Enforce that elements with ARIA roles must have all required attributes
+    // for that role.
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/role-has-required-aria-props.md
+    'jsx-a11y/role-has-required-aria-props': 2,
+
+    // Enforce that elements with explicit or implicit roles defined contain
+    // only aria-* properties supported by that role.
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/role-supports-aria-props.md
+    'jsx-a11y/role-supports-aria-props': 2,
+
+    // Enforce tabIndex value is not greater than zero.
+    // TODO: evaluate
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/tabindex-no-positive.md
+    'jsx-a11y/tabindex-no-positive': 0,
+
+    // ensure <hX> tags have content and are not aria-hidden
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/heading-has-content.md
+    'jsx-a11y/heading-has-content': [2, ['']],
+
+    // require HTML elements to have a "lang" prop
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/html-has-lang.md
+    'jsx-a11y/html-has-lang': 2,
+
+    // require HTML element's lang prop to be valid
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/lang.md
+    'jsx-a11y/lang': 2,
+
+    // prevent marquee elements
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-marquee.md
+    'jsx-a11y/no-marquee': 2,
+
+    // only allow <th> to have the "scope" attr
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/scope.md
+    'jsx-a11y/scope': 2,
+  },
+};

packages/eslint-config-airbnb/rules/react.js

@@ -1,139 +1,259 @@
 module.exports = {
-  'plugins': [
+  plugins: [
     'react'
   ],
-  'ecmaFeatures': {
-    'jsx': true
+  parserOptions: {
+    ecmaFeatures: {
+      jsx: true,
+    },
   },
+  ecmaFeatures: {
+    jsx: true
+  },
+
   // View link below for react rules documentation
   // https://github.com/yannickcr/eslint-plugin-react#list-of-supported-rules
-  'rules': {
+  rules: {
+    // Specify whether double or single quotes should be used in JSX attributes
+    // http://eslint.org/docs/rules/jsx-quotes
+    'jsx-quotes': [2, 'prefer-double'],
+
     // Prevent missing displayName in a React component definition
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/display-name.md
-    'react/display-name': [0, {'acceptTranspilerName': false}],
+    'react/display-name': [0, { ignoreTranspilerName: false }],
+
     // Forbid certain propTypes (any, array, object)
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/forbid-prop-types.md
-    'react/forbid-prop-types': [0, {'forbid': ['any', 'array', 'object']}],
+    'react/forbid-prop-types': [0, { forbid: ['any', 'array', 'object'] }],
+
     // Enforce boolean attributes notation in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-boolean-value.md
     'react/jsx-boolean-value': [2, 'never'],
+
     // Validate closing bracket location in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-closing-bracket-location.md
     'react/jsx-closing-bracket-location': [2, 'line-aligned'],
+
     // Enforce or disallow spaces inside of curly braces in JSX attributes
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-curly-spacing.md
-    'react/jsx-curly-spacing': [0, 'never', {'allowMultiline': true}],
+    'react/jsx-curly-spacing': [2, 'never', { allowMultiline: true }],
+
     // Enforce event handler naming conventions in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-handler-names.md
     'react/jsx-handler-names': [0, {
-      'eventHandlerPrefix': 'handle',
-      'eventHandlerPropPrefix': 'on',
+      eventHandlerPrefix: 'handle',
+      eventHandlerPropPrefix: 'on',
     }],
+
     // Validate props indentation in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-indent-props.md
     'react/jsx-indent-props': [2, 2],
+
     // Validate JSX has key prop when in array or iterator
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-key.md
     'react/jsx-key': 0,
+
     // Limit maximum of props on a single line in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-max-props-per-line.md
-    'react/jsx-max-props-per-line': [0, {'maximum': 1}],
-    // Prevent usage of .bind() and arrow functions in JSX props
+    'react/jsx-max-props-per-line': [0, { maximum: 1 }],
+
+    // Prevent usage of .bind() in JSX props
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md
-    'react/jsx-no-bind': 2,
+    'react/jsx-no-bind': [2, {
+      ignoreRefs: true,
+      allowArrowFunctions: true,
+      allowBind: false,
+    }],
+
     // Prevent duplicate props in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-duplicate-props.md
-    'react/jsx-no-duplicate-props': [0, {'ignoreCase': false}],
+    'react/jsx-no-duplicate-props': [0, { ignoreCase: false }],
+
     // Prevent usage of unwrapped JSX strings
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-literals.md
     'react/jsx-no-literals': 0,
+
     // Disallow undeclared variables in JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-undef.md
     'react/jsx-no-undef': 2,
+
     // Enforce PascalCase for user-defined JSX components
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-pascal-case.md
-    'react/jsx-pascal-case': 0,
-    // Enforce propTypes declarations alphabetical sorting
-    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-sort-prop-types.md
-    'react/jsx-sort-prop-types': [0, {
-      'ignoreCase': false,
-      'callbacksLast': false,
+    'react/jsx-pascal-case': [2, {
+      allowAllCaps: true,
+      ignore: [],
     }],
+
+    // Enforce propTypes declarations alphabetical sorting
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-prop-types.md
+    'react/sort-prop-types': [0, {
+      ignoreCase: false,
+      callbacksLast: false,
+      requiredFirst: false,
+    }],
+
+    // Deprecated in favor of react/jsx-sort-props
+    'react/jsx-sort-prop-types': 0,
+
     // Enforce props alphabetical sorting
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-sort-props.md
     'react/jsx-sort-props': [0, {
-      'ignoreCase': false,
-      'callbacksLast': false,
+      ignoreCase: false,
+      callbacksLast: false,
+      shorthandFirst: false,
+      shorthandLast: false,
     }],
+
     // Prevent React to be incorrectly marked as unused
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-uses-react.md
-    'react/jsx-uses-react': [2, {'pragma': 'React'}],
+    'react/jsx-uses-react': [2],
+
     // Prevent variables used in JSX to be incorrectly marked as unused
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-uses-vars.md
     'react/jsx-uses-vars': 2,
+
     // Prevent usage of dangerous JSX properties
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-danger.md
     'react/no-danger': 0,
+
     // Prevent usage of deprecated methods
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-deprecated.md
-    'react/no-deprecated': [1, {"react": "0.14.0"}],
+    'react/no-deprecated': [2],
+
     // Prevent usage of setState in componentDidMount
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-did-mount-set-state.md
-    'react/no-did-mount-set-state': [2, 'allow-in-func'],
+    'react/no-did-mount-set-state': [2],
+
     // Prevent usage of setState in componentDidUpdate
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-did-update-set-state.md
-    'react/no-did-update-set-state': [2, 'allow-in-func'],
+    'react/no-did-update-set-state': [2],
+
     // Prevent direct mutation of this.state
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-direct-mutation-state.md
     'react/no-direct-mutation-state': 0,
+
     // Prevent usage of isMounted
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-is-mounted.md
     'react/no-is-mounted': 2,
+
     // Prevent multiple component definition per file
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-multi-comp.md
-    'react/no-multi-comp': [2, {'ignoreStateless': false}],
+    'react/no-multi-comp': [2, { ignoreStateless: true }],
+
     // Prevent usage of setState
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-set-state.md
     'react/no-set-state': 0,
+
     // Prevent using string references
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-string-refs.md
-    'react/no-string-refs': 0,
+    'react/no-string-refs': 2,
+
     // Prevent usage of unknown DOM property
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-unknown-property.md
     'react/no-unknown-property': 2,
+
     // Require ES6 class declarations over React.createClass
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-es6-class.md
     'react/prefer-es6-class': [2, 'always'],
+
+    // Require stateless functions when not using lifecycle methods, setState or ref
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-stateless-function.md
+    'react/prefer-stateless-function': 2,
+
     // Prevent missing props validation in a React component definition
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prop-types.md
-    'react/prop-types': [2, {'ignore': [], customValidators: []}],
+    'react/prop-types': [2, { ignore: [], customValidators: [] }],
+
     // Prevent missing React when using JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/react-in-jsx-scope.md
     'react/react-in-jsx-scope': 2,
+
     // Restrict file extensions that may be required
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/require-extension.md
-    'react/require-extension': [0, {'extensions': ['.jsx']}],
+    'react/require-extension': [2, { extensions: ['.jsx', '.js'] }],
+
+    // Require render() methods to return something
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/require-render-return.md
+    'react/require-render-return': 2,
+
     // Prevent extra closing tags for components without children
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/self-closing-comp.md
     'react/self-closing-comp': 2,
+
+    // Enforce spaces before the closing bracket of self-closing JSX elements
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-space-before-closing.md
+    'react/jsx-space-before-closing': [2, 'always'],
+
     // Enforce component methods order
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md
     'react/sort-comp': [2, {
-      'order': [
+      order: [
+        'static-methods',
         'lifecycle',
         '/^on.+$/',
         '/^(get|set)(?!(InitialState$|DefaultProps$|ChildContext$)).+$/',
         'everything-else',
         '/^render.+$/',
         'render'
-      ]
+      ],
     }],
+
     // Prevent missing parentheses around multilines JSX
-    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/wrap-multilines.md
-    'react/wrap-multilines': [2, {
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-wrap-multilines.md
+    'react/jsx-wrap-multilines': [2, {
       declaration: true,
       assignment: true,
       return: true
     }],
+    'react/wrap-multilines': 0, // deprecated version
+
+    // Require that the first prop in a JSX element be on a new line when the element is multiline
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-first-prop-new-line.md
+    'react/jsx-first-prop-new-line': [2, 'multiline'],
+
+    // Enforce spacing around jsx equals signs
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-equals-spacing.md
+    'react/jsx-equals-spacing': [2, 'never'],
+
+    // Enforce JSX indentation
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-indent.md
+    'react/jsx-indent': [2, 2],
+
+    // Disallow target="_blank" on links
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-target-blank.md
+    'react/jsx-no-target-blank': 2,
+
+    // only .jsx files may have JSX
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-filename-extension.md
+    'react/jsx-filename-extension': [2, { extensions: ['.jsx'] }],
+
+    // prevent accidental JS comments from being injected into JSX as text
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-comment-textnodes.md
+    'react/jsx-no-comment-textnodes': 2,
+    'react/no-comment-textnodes': 0, // deprecated version
+
+    // disallow using React.render/ReactDOM.render's return value
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-render-return-value.md
+    'react/no-render-return-value': 2,
+
+    // require a shouldComponentUpdate method, or PureRenderMixin
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/require-optimization.md
+    'react/require-optimization': [0, { allowDecorators: [] }],
+
+    // warn against using findDOMNode()
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-find-dom-node.md
+    'react/no-find-dom-node': 2,
+  },
+
+  settings: {
+    'import/resolver': {
+      node: {
+        extensions: ['.js', '.jsx', '.json']
+      }
+    },
+    react: {
+      pragma: 'React',
+      version: '0.14'
+    },
   }
 };

packages/eslint-config-airbnb/rules/style.js

@@ -1,125 +0,0 @@
-module.exports = {
-  'rules': {
-    // enforce spacing inside array brackets
-    'array-bracket-spacing': [2, 'never'],
-    // 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'],
-    // disallow padding inside computed properties
-    'computed-property-spacing': [2, 'never'],
-    // enforces consistent naming when capturing the current execution context
-    'consistent-this': 0,
-    // enforce newline at the end of file, with no multiple empty lines
-    'eol-last': 2,
-    // require function expressions to have a name
-    'func-names': 1,
-    // enforces 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,
-    // this option sets a specific tab width for your code
-    // https://github.com/eslint/eslint/blob/master/docs/rules/indent.md
-    'indent': [2, 2, { "SwitchCase": 1, "VariableDeclarator": 1 }],
-    // specify whether double or single quotes should be used in JSX attributes
-    // http://eslint.org/docs/rules/jsx-quotes
-    'jsx-quotes': [2, 'prefer-double'],
-    // enforces spacing between keys and values in object literal properties
-    'key-spacing': [2, {'beforeColon': false, 'afterColon': true}],
-    // enforces empty lines around comments
-    'lines-around-comment': 0,
-    // disallow mixed 'LF' and 'CRLF' as linebreaks
-    'linebreak-style': 0,
-    // specify the maximum length of a line in your program
-    // https://github.com/eslint/eslint/blob/master/docs/rules/max-len.md
-    'max-len': [2, 100, 2, {
-      'ignoreUrls': false,
-      'ignoreComments': false
-    }],
-    // specify the maximum depth callbacks can be nested
-    'max-nested-callbacks': 0,
-    // require a capital letter for constructors
-    'new-cap': [2, {'newIsCap': true}],
-    // disallow the omission of parentheses when invoking a constructor with no arguments
-    'new-parens': 0,
-    // allow/disallow an empty newline after var statement
-    'newline-after-var': 0,
-    // disallow use of the Array constructor
-    'no-array-constructor': 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': 0,
-    // disallow mixed spaces and tabs for indentation
-    'no-mixed-spaces-and-tabs': 2,
-    // disallow multiple empty lines and only one newline at the end
-    'no-multiple-empty-lines': [2, {'max': 2, 'maxEOF': 1}],
-    // disallow nested ternary expressions
-    'no-nested-ternary': 2,
-    // disallow use of the Object constructor
-    'no-new-object': 2,
-    // disallow space between function identifier and application
-    'no-spaced-func': 2,
-    // disallow the use of ternary operators
-    'no-ternary': 0,
-    // disallow trailing whitespace at the end of lines
-    'no-trailing-spaces': 2,
-    // disallow dangling underscores in identifiers
-    'no-underscore-dangle': 0,
-    // disallow the use of Boolean literals in conditional expressions
-    'no-unneeded-ternary': 0,
-    // require padding inside curly braces
-    'object-curly-spacing': [2, 'always'],
-    // allow just one var statement 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': 0,
-    // enforce padding within blocks
-    'padded-blocks': [2, 'never'],
-    // require quotes around object literal property names
-    // http://eslint.org/docs/rules/quote-props.html
-    'quote-props': [2, 'as-needed', { 'keywords': true, 'unnecessary': true, 'numbers': false }],
-    // specify whether double or single quotes should be used
-    'quotes': [2, 'single', 'avoid-escape'],
-    // require identifiers to match the provided regular expression
-    'id-match': 0,
-    // enforce spacing before and after semicolons
-    'semi-spacing': [2, {'before': false, 'after': true}],
-    // require or disallow use of semicolons instead of ASI
-    'semi': [2, 'always'],
-    // sort variables within the same declaration block
-    'sort-vars': 0,
-    // require a space before certain keywords
-    'space-before-keywords': [2, 'always'],
-    // require a space after certain keywords
-    'space-after-keywords': [2, 'always'],
-    // require or disallow space before blocks
-    'space-before-blocks': 2,
-    // require or disallow space before function opening parenthesis
-    // https://github.com/eslint/eslint/blob/master/docs/rules/space-before-function-paren.md
-    'space-before-function-paren': [2, { 'anonymous': 'always', 'named': 'never' }],
-    // require or disallow spaces inside parentheses
-    'space-in-parens': [2, 'never'],
-    // require spaces around operators
-    'space-infix-ops': 2,
-    // require a space after return, throw, and case
-    'space-return-throw-case': 2,
-    // Require or disallow spaces before/after unary operators
-    'space-unary-ops': 0,
-    // require or disallow a space immediately following the // or /* in a comment
-    'spaced-comment': [2, 'always', {
-      'exceptions': ['-', '+'],
-      'markers': ['=', '!']           // space here to support sprockets directives
-    }],
-    // require regex literals to be wrapped in parentheses
-    'wrap-regex': 0
-  }
-};

packages/eslint-config-airbnb/test/.eslintrc

@@ -3,7 +3,11 @@
     // disabled because I find it tedious to write tests while following this
     // rule
     "no-shadow": 0,
+
     // tests uses `t` for tape
-    "id-length": [2, {"min": 2, "properties": "never", "exceptions": ["t"]}]
+    "id-length": [2, {"min": 2, "properties": "never", "exceptions": ["t"]}],
+
+    // tests can import things in devDependencies
+    "import/no-extraneous-dependencies": [2, {"devDependencies": true}]
   }
 }

packages/eslint-config-airbnb/test/test-base.js

@@ -2,16 +2,16 @@ import fs from 'fs';
 import path from 'path';
 import test from 'tape';
 
-const files = {
-  base: require('../base')
-};
+const base = require('../base');
+
+const files = { base };
 
 fs.readdirSync(path.join(__dirname, '../rules')).forEach(name => {
-  if (name === 'react.js') {
+  if (name === 'react.js' || name === 'react-a11y.js') {
     return;
   }
 
-  files[name] = require(`../rules/${name}`);
+  files[name] = require(`../rules/${name}`); // eslint-disable-line global-require
 });
 
 Object.keys(files).forEach(name => {
@@ -20,7 +20,10 @@ Object.keys(files).forEach(name => {
   test(`${name}: does not reference react`, t => {
     t.plan(2);
 
-    t.notOk(config.plugins, 'plugins is unspecified');
+    // scan plugins for react and fail if it is found
+    const hasReactPlugin = Object.prototype.hasOwnProperty.call(config, 'plugins') &&
+      config.plugins.indexOf('react') !== -1;
+    t.notOk(hasReactPlugin, 'there is no react plugin');
 
     // scan rules for react/ and fail if any exist
     const reactRuleIds = Object.keys(config.rules)

packages/eslint-config-airbnb/test/test-react-order.js

@@ -1,39 +1,45 @@
 import test from 'tape';
 import { CLIEngine } from 'eslint';
 import eslintrc from '../';
-import baseConfig from '../base';
 import reactRules from '../rules/react';
+import reactA11yRules from '../rules/react-a11y';
 
 const cli = new CLIEngine({
   useEslintrc: false,
   baseConfig: eslintrc,
 
-  // This rule fails when executing on text.
-  rules: {indent: 0},
+  rules: {
+    // It is okay to import devDependencies in tests.
+    'import/no-extraneous-dependencies': [2, { devDependencies: true }],
+  },
 });
 
 function lint(text) {
   // @see http://eslint.org/docs/developer-guide/nodejs-api.html#executeonfiles
   // @see http://eslint.org/docs/developer-guide/nodejs-api.html#executeontext
-  return cli.executeOnText(text).results[0];
+  const linter = cli.executeOnText(text);
+  return linter.results[0];
 }
 
 function wrapComponent(body) {
   return `
 import React from 'react';
+
 export default class MyComponent extends React.Component {
+/* eslint no-empty-function: 0 */
 ${body}
 }
 `;
 }
 
-test('validate react prop order', t => {
-  t.test('make sure our eslintrc has React linting dependencies', t => {
-    t.plan(1);
-    t.equal(reactRules.plugins[0], 'react', 'uses eslint-plugin-react');
+test('validate react prop order', (t) => {
+  t.test('make sure our eslintrc has React and JSX linting dependencies', (t) => {
+    t.plan(2);
+    t.deepEqual(reactRules.plugins, ['react']);
+    t.deepEqual(reactA11yRules.plugins, ['jsx-a11y', 'react']);
   });
 
-  t.test('passes a good component', t => {
+  t.test('passes a good component', (t) => {
     t.plan(3);
     const result = lint(wrapComponent(`
   componentWillMount() {}

react/README.md

@@ -5,13 +5,14 @@
 ## Table of Contents
 
   1. [Basic Rules](#basic-rules)
-  1. [Class vs `React.createClass`](#class-vs-reactcreateclass)
+  1. [Class vs `React.createClass` vs stateless](#class-vs-reactcreateclass-vs-stateless)
   1. [Naming](#naming)
   1. [Declaration](#declaration)
   1. [Alignment](#alignment)
   1. [Quotes](#quotes)
   1. [Spacing](#spacing)
   1. [Props](#props)
+  1. [Refs](#refs)
   1. [Parentheses](#parentheses)
   1. [Tags](#tags)
   1. [Methods](#methods)
@@ -21,40 +22,60 @@
 ## Basic Rules
 
   - Only include one React component per file.
+    - However, multiple [Stateless, or Pure, Components](https://facebook.github.io/react/docs/reusable-components.html#stateless-functions) are allowed per file. eslint: [`react/no-multi-comp`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-multi-comp.md#ignorestateless).
   - Always use JSX syntax.
   - Do not use `React.createElement` unless you're initializing the app from a file that is not JSX.
 
-## Class vs `React.createClass`
+## Class vs `React.createClass` vs stateless
 
-  - Use `class extends React.Component` unless you have a very good reason to use mixins.
+  - If you have internal state and/or refs, prefer `class extends React.Component` over `React.createClass` unless you have a very good reason to use mixins. eslint: [`react/prefer-es6-class`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-es6-class.md) [`react/prefer-stateless-function`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-stateless-function.md)
 
-  eslint rules: [`react/prefer-es6-class`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prefer-es6-class.md).
-
-    ```javascript
+    ```jsx
     // bad
     const Listing = React.createClass({
+      // ...
       render() {
-        return <div />;
+        return <div>{this.state.hello}</div>;
       }
     });
 
     // good
     class Listing extends React.Component {
+      // ...
       render() {
-        return <div />;
+        return <div>{this.state.hello}</div>;
       }
     }
     ```
 
+    And if you don't have state or refs, prefer normal functions (not arrow functions) over classes:
+
+    ```jsx
+    // bad
+    class Listing extends React.Component {
+      render() {
+        return <div>{this.props.hello}</div>;
+      }
+    }
+
+    // bad (relying on function name inference is discouraged)
+    const Listing = ({ hello }) => (
+      <div>{hello}</div>
+    );
+
+    // good
+    function Listing({ hello }) {
+      return <div>{hello}</div>;
+    }
+    ```
+
 ## Naming
 
   - **Extensions**: Use `.jsx` extension for React components.
   - **Filename**: Use PascalCase for filenames. E.g., `ReservationCard.jsx`.
-  - **Reference Naming**: Use PascalCase for React components and camelCase for their instances.
+  - **Reference Naming**: Use PascalCase for React components and camelCase for their instances. eslint: [`react/jsx-pascal-case`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-pascal-case.md)
 
-  eslint rules: [`react/jsx-pascal-case`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-pascal-case.md).
-
-    ```javascript
+    ```jsx
     // bad
     import reservationCard from './ReservationCard';
 
@@ -70,7 +91,7 @@
 
   - **Component Naming**: Use the filename as the component name. For example, `ReservationCard.jsx` should have a reference name of `ReservationCard`. However, for root components of a directory, use `index.jsx` as the filename and use the directory name as the component name:
 
-    ```javascript
+    ```jsx
     // bad
     import Footer from './Footer/Footer';
 
@@ -80,12 +101,37 @@
     // good
     import Footer from './Footer';
     ```
+  - **Higher-order Component Naming**: Use a composite of the higher-order component's name and the passed-in component's name as the `displayName` on the generated component. For example, the higher-order component `withFoo()`, when passed a component `Bar` should produce a component with a `displayName` of `withFoo(Bar)`.
 
+  > Why? A component's `displayName` may be used by developer tools or in error messages, and having a value that clearly expresses this relationship helps people understand what is happening.
+
+    ```jsx
+    // bad
+    export default function withFoo(WrappedComponent) {
+      return function WithFoo(props) {
+        return <WrappedComponent {...props} foo />;
+      }
+    }
+
+    // good
+    export default function withFoo(WrappedComponent) {
+      function WithFoo(props) {
+        return <WrappedComponent {...props} foo />;
+      }
+
+      const wrappedComponentName = WrappedComponent.displayName
+        || WrappedComponent.name
+        || 'Component';
+
+      WithFoo.displayName = `withFoo(${wrappedComponentName})`;
+      return WithFoo;
+    }
+    ```
 ## Declaration
 
   - Do not use `displayName` for naming components. Instead, name the component by reference.
 
-    ```javascript
+    ```jsx
     // bad
     export default React.createClass({
       displayName: 'ReservationCard',
@@ -99,11 +145,9 @@
 
 ## Alignment
 
-  - Follow these alignment styles for JSX syntax
+  - Follow these alignment styles for JSX syntax. eslint: [`react/jsx-closing-bracket-location`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-closing-bracket-location.md)
 
-  eslint rules: [`react/jsx-closing-bracket-location`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-closing-bracket-location.md).
-
-    ```javascript
+    ```jsx
     // bad
     <Foo superLongParam="bar"
          anotherSuperLongParam="baz" />
@@ -122,20 +166,18 @@
       superLongParam="bar"
       anotherSuperLongParam="baz"
     >
-      <Spazz />
+      <Quux />
     </Foo>
     ```
 
 ## Quotes
 
-  - Always use double quotes (`"`) for JSX attributes, but single quotes for all other JS.
+  - Always use double quotes (`"`) for JSX attributes, but single quotes for all other JS. eslint: [`jsx-quotes`](http://eslint.org/docs/rules/jsx-quotes)
 
-  > Why? JSX attributes [can't contain escaped quotes](http://eslint.org/docs/rules/jsx-quotes), so double quotes make conjunctions like `"don't"` easier to type.
+  > Why? JSX attributes [can't contain escaped quotes](http://eslint.org/docs/rules/jsx-quotes), so double quotes make contractions like `"don't"` easier to type.
   > Regular HTML attributes also typically use double quotes instead of single, so JSX attributes mirror this convention.
 
-  eslint rules: [`jsx-quotes`](http://eslint.org/docs/rules/jsx-quotes).
-
-    ```javascript
+    ```jsx
     // bad
     <Foo bar='bar' />
 
@@ -153,7 +195,7 @@
 
   - Always include a single space in your self-closing tag.
 
-    ```javascript
+    ```jsx
     // bad
     <Foo/>
 
@@ -168,11 +210,21 @@
     <Foo />
     ```
 
+  - Do not pad JSX curly braces with spaces. eslint: [`react/jsx-curly-spacing`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-curly-spacing.md)
+
+    ```jsx
+    // bad
+    <Foo bar={ baz } />
+
+    // good
+    <Foo bar={baz} />
+    ```
+
 ## Props
 
   - Always use camelCase for prop names.
 
-    ```javascript
+    ```jsx
     // bad
     <Foo
       UserName="hello"
@@ -186,11 +238,9 @@
     />
     ```
 
-  - Omit the value of the prop when it is explicitly `true`.
+  - Omit the value of the prop when it is explicitly `true`. eslint: [`react/jsx-boolean-value`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-boolean-value.md)
 
-  eslint rules: [`react/jsx-boolean-value`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-boolean-value.md).
-
-    ```javascript
+    ```jsx
     // bad
     <Foo
       hidden={true}
@@ -202,13 +252,100 @@
     />
     ```
 
+  - Always include an `alt` prop on `<img>` tags. If the image is presentational, `alt` can be an empty string or the `<img>` must have `role="presentation"`. eslint: [`jsx-a11y/img-has-alt`](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/img-has-alt.md)
+
+    ```jsx
+    // bad
+    <img src="hello.jpg" />
+
+    // good
+    <img src="hello.jpg" alt="Me waving hello" />
+
+    // good
+    <img src="hello.jpg" alt="" />
+
+    // good
+    <img src="hello.jpg" role="presentation" />
+    ```
+
+  - Do not use words like "image", "photo", or "picture" in `<img>` `alt` props. eslint: [`jsx-a11y/img-redundant-alt`](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/img-redundant-alt.md)
+
+  > Why? Screenreaders already announce `img` elements as images, so there is no need to include this information in the alt text.
+
+    ```jsx
+    // bad
+    <img src="hello.jpg" alt="Picture of me waving hello" />
+
+    // good
+    <img src="hello.jpg" alt="Me waving hello" />
+    ```
+
+  - Use only valid, non-abstract [ARIA roles](https://www.w3.org/TR/wai-aria/roles#role_definitions). eslint: [`jsx-a11y/aria-role`](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/aria-role.md)
+
+    ```jsx
+    // bad - not an ARIA role
+    <div role="datepicker" />
+
+    // bad - abstract ARIA role
+    <div role="range" />
+
+    // good
+    <div role="button" />
+    ```
+
+  - Do not use `accessKey` on elements. eslint: [`jsx-a11y/no-access-key`](https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-access-key.md)
+
+  > Why? Inconsistencies between keyboard shortcuts and keyboard commands used by people using screenreaders and keyboards complicate accessibility.
+
+  ```jsx
+  // bad
+  <div accessKey="h" />
+
+  // good
+  <div />
+  ```
+
+  - Avoid using an array index as `key` prop, prefer a unique ID. ([why?](https://medium.com/@robinpokorny/index-as-a-key-is-an-anti-pattern-e0349aece318))
+
+  ```jsx
+  // bad
+  {todos.map((todo, index) =>
+    <Todo
+      {...todo}
+      key={index}
+    />
+  )}
+
+  // good
+  {todos.map(todo => (
+    <Todo
+      {...todo}
+      key={todo.id}
+    />
+  ))}
+  ```
+
+## Refs
+
+  - Always use ref callbacks. eslint: [`react/no-string-refs`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-string-refs.md)
+
+    ```jsx
+    // bad
+    <Foo
+      ref="myRef"
+    />
+
+    // good
+    <Foo
+      ref={(ref) => this.myRef = ref}
+    />
+    ```
+
 ## Parentheses
 
-  - Wrap JSX tags in parentheses when they span more than one line.
+  - Wrap JSX tags in parentheses when they span more than one line. eslint: [`react/wrap-multilines`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/wrap-multilines.md)
 
-  eslint rules: [`react/wrap-multilines`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/wrap-multilines.md).
-
-    ```javascript
+    ```jsx
     // bad
     render() {
       return <MyComponent className="long body" foo="bar">
@@ -234,11 +371,9 @@
 
 ## Tags
 
-  - Always self-close tags that have no children.
+  - Always self-close tags that have no children. eslint: [`react/self-closing-comp`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/self-closing-comp.md)
 
-  eslint rules: [`react/self-closing-comp`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/self-closing-comp.md).
-
-    ```javascript
+    ```jsx
     // bad
     <Foo className="stuff"></Foo>
 
@@ -246,11 +381,9 @@
     <Foo className="stuff" />
     ```
 
-  - If your component has multi-line properties, close its tag on a new line.
+  - If your component has multi-line properties, close its tag on a new line. eslint: [`react/jsx-closing-bracket-location`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-closing-bracket-location.md)
 
-  eslint rules: [`react/jsx-closing-bracket-location`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-closing-bracket-location.md).
-
-    ```javascript
+    ```jsx
     // bad
     <Foo
       bar="bar"
@@ -265,13 +398,28 @@
 
 ## Methods
 
-  - Bind event handlers for the render method in the constructor.
+  - Use arrow functions to close over local variables.
 
-  > Why? A bind call in a the render path creates a brand new function on every single render.
+    ```jsx
+    function ItemList(props) {
+      return (
+        <ul>
+          {props.items.map((item, index) => (
+            <Item
+              key={item.key}
+              onClick={() => doSomethingWith(item.name, index)}
+            />
+          ))}
+        </ul>
+      );
+    }
+    ```
 
-  eslint rules: [`react/jsx-no-bind`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md).
+  - Bind event handlers for the render method in the constructor. eslint: [`react/jsx-no-bind`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md)
 
-    ```javascript
+  > Why? A bind call in the render path creates a brand new function on every single render.
+
+    ```jsx
     // bad
     class extends React.Component {
       onClickDiv() {
@@ -303,7 +451,7 @@
 
   - Do not use underscore prefix for internal methods of a React component.
 
-    ```javascript
+    ```jsx
     // bad
     React.createClass({
       _onClickSubmit() {
@@ -323,12 +471,26 @@
     }
     ```
 
+  - Be sure to return a value in your `render` methods. eslint: [`require-render-return`](https://github.com/yannickcr/eslint-plugin-react/pull/502)
+
+    ```jsx
+    // bad
+    render() {
+      (<div />);
+    }
+
+    // good
+    render() {
+      return (<div />);
+    }
+    ```
+
 ## Ordering
 
   - Ordering for `class extends React.Component`:
 
-  1. `constructor`
   1. optional `static` methods
+  1. `constructor`
   1. `getChildContext`
   1. `componentWillMount`
   1. `componentDidMount`
@@ -344,7 +506,7 @@
 
   - How to define `propTypes`, `defaultProps`, `contextTypes`, etc...
 
-    ```javascript
+    ```jsx
     import React, { PropTypes } from 'react';
 
     const propTypes = {
@@ -373,7 +535,7 @@
     export default Link;
     ```
 
-  - Ordering for `React.createClass`:
+  - Ordering for `React.createClass`: eslint: [`react/sort-comp`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md)
 
   1. `displayName`
   1. `propTypes`
@@ -397,16 +559,21 @@
   1. *Optional render methods* like `renderNavigation()` or `renderProfilePicture()`
   1. `render`
 
-  eslint rules: [`react/sort-comp`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md).
-
 ## `isMounted`
 
-  - Do not use `isMounted`.
+  - Do not use `isMounted`. eslint: [`react/no-is-mounted`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-is-mounted.md)
 
   > Why? [`isMounted` is an anti-pattern][anti-pattern], is not available when using ES6 classes, and is on its way to being officially deprecated.
 
   [anti-pattern]: https://facebook.github.io/react/blog/2015/12/16/ismounted-antipattern.html
 
-  eslint rules: [`react/no-is-mounted`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-is-mounted.md).
+## Translation
+
+  This JSX/React style guide is also available in other languages:
+
+  - ![cn](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/China.png) **Chinese (Simplified)**: [JasonBoy/javascript](https://github.com/JasonBoy/javascript/tree/master/react)
+  - ![pl](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Poland.png) **Polish**: [pietraszekl/javascript](https://github.com/pietraszekl/javascript/tree/master/react)
+  - ![kr](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/South-Korea.png) **Korean**: [apple77y/javascript](https://github.com/apple77y/javascript/tree/master/react)
+  - ![Br](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Brazil.png) **Portuguese**: [ronal2do/javascript](https://github.com/ronal2do/airbnb-react-styleguide)
 
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