[eslint config] v11.1.0

This will cause new failures for some, but only for those not following our style guide already - hence, it’s not semver-major.

README.md

@@ -7,8 +7,9 @@
 [![Gitter](https://badges.gitter.im/Join Chat.svg)](https://gitter.im/airbnb/javascript?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
 Other Style Guides
- - [ES5](es5/)
+ - [ES5 (Deprecated)](https://github.com/airbnb/javascript/tree/es5-deprecated/es5)
  - [React](react/)
+ - [CSS-in-JavaScript](css-in-javascript/)
  - [CSS & Sass](https://github.com/airbnb/css)
  - [Ruby](https://github.com/airbnb/ruby)
 
@@ -40,7 +41,7 @@ Other Style Guides
   1. [Events](#events)
   1. [jQuery](#jquery)
   1. [ECMAScript 5 Compatibility](#ecmascript-5-compatibility)
-  1. [ECMAScript 6 Styles](#ecmascript-6-styles)
+  1. [ECMAScript 6+ (ES 2015+) Styles](#ecmascript-6-es-2015-styles)
   1. [Testing](#testing)
   1. [Performance](#performance)
   1. [Resources](#resources)
@@ -153,43 +154,6 @@ Other Style Guides
     const item = {};
     ```
 
-  <a name="objects--reserved-words"></a><a name="3.2"></a>
-  - [3.2](#objects--reserved-words) If your code will be executed in browsers in script context, don't use [reserved words](http://es5.github.io/#x7.6.1) as keys. It won't work in IE8. [More info](https://github.com/airbnb/javascript/issues/61). It’s OK to use them in ES6 modules and server-side code. jscs: [`disallowIdentifierNames`](http://jscs.info/rule/disallowIdentifierNames)
-
-    ```javascript
-    // bad
-    const superman = {
-      default: { clark: 'kent' },
-      private: true,
-    };
-
-    // good
-    const superman = {
-      defaults: { clark: 'kent' },
-      hidden: true,
-    };
-    ```
-
-  <a name="objects--reserved-words-2"></a><a name="3.3"></a>
-  - [3.3](#objects--reserved-words-2) Use readable synonyms in place of reserved words. jscs: [`disallowIdentifierNames`](http://jscs.info/rule/disallowIdentifierNames)
-
-    ```javascript
-    // bad
-    const superman = {
-      class: 'alien',
-    };
-
-    // bad
-    const superman = {
-      klass: 'alien',
-    };
-
-    // good
-    const superman = {
-      type: 'alien',
-    };
-    ```
-
   <a name="es6-computed-properties"></a><a name="3.4"></a>
   - [3.4](#es6-computed-properties) Use computed property names when creating objects with dynamic property names.
 
@@ -512,30 +476,32 @@ Other Style Guides
     // bad
     const name = "Capt. Janeway";
 
+    // bad - template literals should contain interpolation or newlines
+    const name = `Capt. Janeway`;
+
     // good
     const name = 'Capt. Janeway';
     ```
 
   <a name="strings--line-length"></a><a name="6.2"></a>
-  - [6.2](#strings--line-length) Strings that cause the line to go over 100 characters should be written across multiple lines using string concatenation.
+  - [6.2](#strings--line-length) Strings that cause the line to go over 100 characters should not be written across multiple lines using string concatenation.
 
-  <a name="strings--concat-perf"></a><a name="6.3"></a>
-  - [6.3](#strings--concat-perf) Note: If overused, long strings with concatenation could impact performance. [jsPerf](http://jsperf.com/ya-string-concat) & [Discussion](https://github.com/airbnb/javascript/issues/40).
+    > Why? Broken strings are painful to work with and make code less searchable.
 
     ```javascript
-    // bad
-    const errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.';
-
     // bad
     const errorMessage = 'This is a super long error that was thrown because \
     of Batman. When you stop to think about how Batman had anything to do \
     with this, you would get nowhere \
     fast.';
 
-    // good
+    // bad
     const errorMessage = 'This is a super long error that was thrown because ' +
       'of Batman. When you stop to think about how Batman had anything to do ' +
       'with this, you would get nowhere fast.';
+
+    // good
+    const errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.';
     ```
 
   <a name="es6-template-literals"></a><a name="6.4"></a>
@@ -588,18 +554,22 @@ Other Style Guides
 ## Functions
 
   <a name="functions--declarations"></a><a name="7.1"></a>
-  - [7.1](#functions--declarations) Use function declarations instead of function expressions. jscs: [`requireFunctionDeclarations`](http://jscs.info/rule/requireFunctionDeclarations)
+  - [7.1](#functions--declarations) Use named function expressions instead of function declarations. eslint: [`func-style`](http://eslint.org/docs/rules/func-style) jscs: [`requireFunctionDeclarations`](http://jscs.info/rule/requireFunctionDeclarations)
 
-    > Why? Function declarations are named, so they're easier to identify in call stacks. Also, the whole body of a function declaration is hoisted, whereas only the reference of a function expression is hoisted. This rule makes it possible to always use [Arrow Functions](#arrow-functions) in place of function expressions.
+    > Why? Function declarations are hoisted, which means that it’s easy - too easy - to reference the function before it is defined in the file. This harms readability and maintainability. If you find that a function’s definition is large or complex enough that it is interfering with understanding the rest of the file, then perhaps it’s time to extract it to its own module! Don’t forget to name the expression - anonymous functions can make it harder to locate the problem in an Error's call stack.
 
     ```javascript
     // bad
     const foo = function () {
     };
 
-    // good
+    // bad
     function foo() {
     }
+
+    // good
+    const foo = function bar() {
+    };
     ```
 
   <a name="functions--iife"></a><a name="7.2"></a>
@@ -730,7 +700,7 @@ Other Style Guides
     ```
 
   <a name="functions--constructor"></a><a name="7.10"></a>
-  - [7.10](#functions--constructor) Never use the Function constructor to create a new function.
+  - [7.10](#functions--constructor) Never use the Function constructor to create a new function. eslint: [`no-new-func`](http://eslint.org/docs/rules/no-new-func)
 
     > Why? Creating a function in this way evaluates a string similarly to eval(), which opens vulnerabilities.
 
@@ -743,7 +713,7 @@ Other Style Guides
     ```
 
   <a name="functions--signature-spacing"></a><a name="7.11"></a>
-  - [7.11](#functions--signature-spacing) Spacing in a function signature.
+  - [7.11](#functions--signature-spacing) Spacing in a function signature. eslint: [`space-before-function-paren`](http://eslint.org/docs/rules/space-before-function-paren) [`space-before-blocks`](http://eslint.org/docs/rules/space-before-blocks)
 
     > Why? Consistency is good, and you shouldn’t have to add or remove a space when adding or removing a name.
 
@@ -799,6 +769,27 @@ Other Style Guides
     }
     ```
 
+  <a name="functions--spread-vs-apply"></a><a name="7.14"></a>
+  - [7.14](#functions--spread-vs-apply) Prefer the use of the spread operator `...` to call variadic functions. eslint: [`prefer-spread`](http://eslint.org/docs/rules/prefer-spread)
+
+    > Why? It's cleaner, you don't need to supply a context, and you can not easily compose `new` with `apply`.
+
+    ```javascript
+    // bad
+    const x = [1, 2, 3, 4, 5];
+    console.log.apply(console, x);
+
+    // good
+    const x = [1, 2, 3, 4, 5];
+    console.log(...x);
+
+    // bad
+    new (Function.prototype.bind.apply(Date, [null, 2016, 08, 05]));
+
+    // good
+    new Date(...[2016, 08, 05]);
+    ```
+
 **[⬆ back to top](#table-of-contents)**
 
 ## Arrow Functions
@@ -1291,6 +1282,35 @@ Other Style Guides
     }
     ```
 
+    - [13.5](#variables--unary-increment-decrement) Avoid using unary increments and decrements (++, --). eslint [`no-plusplus`](http://eslint.org/docs/rules/no-plusplus)
+
+      > Why? Per the eslint documentation, unary increment and decrement statements are subject to automatic semicolon insertion and can cause silent errors with incrementing or decrementing values within an application. It is also more expressive to mutate your values with statements like `num += 1` instead of `num ++`. Disallowing unary increment and decrement statements also prevents you from pre-incrementing/pre-decrementing values unintentionally which can also cause unexpected behavior in your programs.
+
+      ```javascript
+        // bad
+
+        let array = [1, 2, 3];
+        let num = 1;
+        let increment = num ++;
+        let decrement = -- num;
+
+        for(let i = 0; i < array.length; i++){
+          let value = array[i];
+          ++value;
+        }
+
+        // good
+
+        let array = [1, 2, 3];
+        let num = 1;
+        let increment = num += 1;
+        let decrement = num -= 1;
+
+        array.forEach((value) => {
+          value += 1;
+        });
+      ```
+
 **[⬆ back to top](#table-of-contents)**
 
 
@@ -1334,7 +1354,7 @@ Other Style Guides
 ## Variables
 
   <a name="variables--const"></a><a name="13.1"></a>
-  - [13.1](#variables--const) Always use `const` to declare variables. Not doing so will result in global variables. We want to avoid polluting the global namespace. Captain Planet warned us of that.
+  - [13.1](#variables--const) Always use `const` to declare variables. Not doing so will result in global variables. We want to avoid polluting the global namespace. Captain Planet warned us of that. eslint: [`no-undef`](http://eslint.org/docs/rules/no-undef) [`prefer-const`](http://eslint.org/docs/rules/prefer-const)
 
     ```javascript
     // bad
@@ -1431,6 +1451,38 @@ Other Style Guides
       return name;
     }
     ```
+  <a name="variables--no-chain-assignment"></a><a name="13.5"></a>
+  - [13.5](#variables--no-chain-assignment) Don't chain variable assignments.
+
+    > Why? Chaining variable assignments creates implicit global variables.
+
+    ```javascript
+    // bad
+    (function example() {
+      // JavaScript interprets this as
+      // let a = ( b = ( c = 1 ) );
+      // The let keyword only applies to variable a; variables b and c become
+      // global variables.
+      let a = b = c = 1;
+    }());
+
+    console.log(a); // undefined
+    console.log(b); // 1
+    console.log(c); // 1
+
+    // good
+    (function example() {
+      let a = 1;
+      let b = a;
+      let c = a;
+    }());
+
+    console.log(a); // undefined
+    console.log(b); // undefined
+    console.log(c); // undefined
+
+    // the same applies for `const`
+    ```
 
 **[⬆ back to top](#table-of-contents)**
 
@@ -1583,7 +1635,7 @@ Other Style Guides
     ```
 
   <a name="comparison--moreinfo"></a><a name="15.4"></a>
-  - [15.4](#comparison--moreinfo) For more information see [Truth Equality and JavaScript](http://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/#more-2108) by Angus Croll.
+  - [15.4](#comparison--moreinfo) For more information see [Truth Equality and JavaScript](https://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/#more-2108) by Angus Croll.
 
   <a name="comparison--switch-blocks"></a><a name="15.5"></a>
   - [15.5](#comparison--switch-blocks) Use braces to create blocks in `case` and `default` clauses that contain lexical declarations (e.g. `let`, `const`, `function`, and `class`).
@@ -1731,7 +1783,7 @@ Other Style Guides
 ## Comments
 
   <a name="comments--multiline"></a><a name="17.1"></a>
-  - [17.1](#comments--multiline) Use `/** ... */` for multi-line comments. Include a description, specify types and values for all parameters and return values.
+  - [17.1](#comments--multiline) Use `/** ... */` for multi-line comments.
 
     ```javascript
     // bad
@@ -1750,10 +1802,7 @@ Other Style Guides
     // good
     /**
      * make() returns a new element
-     * based on the passed in tag name
-     *
-     * @param {String} tag
-     * @return {Element} element
+     * based on the passed-in tag name
      */
     function make(tag) {
 
@@ -2131,20 +2180,24 @@ Other Style Guides
     ```
 
   <a name="whitespace--max-len"></a><a name="18.12"></a>
-  - [18.12](#whitespace--max-len) Avoid having lines of code that are longer than 100 characters (including whitespace). eslint: [`max-len`](http://eslint.org/docs/rules/max-len.html) jscs: [`maximumLineLength`](http://jscs.info/rule/maximumLineLength)
+  - [18.12](#whitespace--max-len) Avoid having lines of code that are longer than 100 characters (including whitespace). Note: per [above](#strings--line-length), long strings are exempt from this rule, and should not be broken up. eslint: [`max-len`](http://eslint.org/docs/rules/max-len.html) jscs: [`maximumLineLength`](http://jscs.info/rule/maximumLineLength)
 
     > Why? This ensures readability and maintainability.
 
     ```javascript
     // bad
-    const foo = 'Whatever national crop flips the window. The cartoon reverts within the screw. Whatever wizard constrains a helpful ally. The counterpart ascends!';
+    const foo = jsonData && jsonData.foo && jsonData.foo.bar && jsonData.foo.bar.baz && jsonData.foo.bar.baz.quux && jsonData.foo.bar.baz.quux.xyzzy;
 
     // bad
     $.ajax({ method: 'POST', url: 'https://airbnb.com/', data: { name: 'John' } }).done(() => console.log('Congratulations!')).fail(() => console.log('You have failed this city.'));
 
     // good
-    const foo = 'Whatever national crop flips the window. The cartoon reverts within the screw. ' +
-      'Whatever wizard constrains a helpful ally. The counterpart ascends!';
+    const foo = jsonData
+      && jsonData.foo
+      && jsonData.foo.bar
+      && jsonData.foo.bar.baz
+      && jsonData.foo.bar.baz.quux
+      && jsonData.foo.bar.baz.quux.xyzzy;
 
     // good
     $.ajax({
@@ -2267,7 +2320,7 @@ Other Style Guides
     }());
     ```
 
-    [Read more](http://stackoverflow.com/questions/7365172/semicolon-before-self-invoking-function/7365214%237365214).
+    [Read more](https://stackoverflow.com/questions/7365172/semicolon-before-self-invoking-function/7365214%237365214).
 
 **[⬆ back to top](#table-of-contents)**
 
@@ -2319,7 +2372,7 @@ Other Style Guides
     ```
 
   <a name="coercion--comment-deviations"></a><a name="21.4"></a>
-  - [21.4](#coercion--comment-deviations) If for whatever reason you are doing something wild and `parseInt` is your bottleneck and need to use Bitshift for [performance reasons](http://jsperf.com/coercion-vs-casting/3), leave a comment explaining why and what you're doing.
+  - [21.4](#coercion--comment-deviations) If for whatever reason you are doing something wild and `parseInt` is your bottleneck and need to use Bitshift for [performance reasons](https://jsperf.com/coercion-vs-casting/3), leave a comment explaining why and what you're doing.
 
     ```javascript
     // good
@@ -2332,7 +2385,7 @@ Other Style Guides
     ```
 
   <a name="coercion--bitwise"></a><a name="21.5"></a>
-  - [21.5](#coercion--bitwise) **Note:** Be careful when using bitshift operations. Numbers are represented as [64-bit values](http://es5.github.io/#x4.3.19), but bitshift operations always return a 32-bit integer ([source](http://es5.github.io/#x11.7)). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. [Discussion](https://github.com/airbnb/javascript/issues/109). Largest signed 32-bit Int is 2,147,483,647:
+  - [21.5](#coercion--bitwise) **Note:** Be careful when using bitshift operations. Numbers are represented as [64-bit values](https://es5.github.io/#x4.3.19), but bitshift operations always return a 32-bit integer ([source](https://es5.github.io/#x11.7)). Bitshift can lead to unexpected behavior for integer values larger than 32 bits. [Discussion](https://github.com/airbnb/javascript/issues/109). Largest signed 32-bit Int is 2,147,483,647:
 
     ```javascript
     2147483647 >> 0 //=> 2147483647
@@ -2362,7 +2415,7 @@ Other Style Guides
 ## Naming Conventions
 
   <a name="naming--descriptive"></a><a name="22.1"></a>
-  - [22.1](#naming--descriptive) Avoid single letter names. Be descriptive with your naming.
+  - [22.1](#naming--descriptive) Avoid single letter names. Be descriptive with your naming. eslint: [`id-length`](http://eslint.org/docs/rules/id-length)
 
     ```javascript
     // bad
@@ -2695,17 +2748,18 @@ Other Style Guides
 ## ECMAScript 5 Compatibility
 
   <a name="es5-compat--kangax"></a><a name="26.1"></a>
-  - [26.1](#es5-compat--kangax) Refer to [Kangax](https://twitter.com/kangax/)'s ES5 [compatibility table](http://kangax.github.io/es5-compat-table/).
+  - [26.1](#es5-compat--kangax) Refer to [Kangax](https://twitter.com/kangax/)'s ES5 [compatibility table](https://kangax.github.io/es5-compat-table/).
 
 **[⬆ back to top](#table-of-contents)**
 
-## ECMAScript 6 Styles
+<a name="ecmascript-6-styles"></a>
+## ECMAScript 6+ (ES 2015+) Styles
 
   <a name="es6-styles"></a><a name="27.1"></a>
   - [27.1](#es6-styles) This is a collection of links to the various ES6 features.
 
 1. [Arrow Functions](#arrow-functions)
-1. [Classes](#constructors)
+1. [Classes](#classes--constructors)
 1. [Object Shorthand](#es6-object-shorthand)
 1. [Object Concise](#es6-object-concise)
 1. [Object Computed Properties](#es6-computed-properties)
@@ -2718,6 +2772,11 @@ Other Style Guides
 1. [Iterators and Generators](#iterators-and-generators)
 1. [Modules](#modules)
 
+  <a name="tc39-proposals"></a>
+  - [27.2](#tc39-proposals) Do not use [TC39 proposals](https://github.com/tc39/proposals) that have not reached stage 3.
+
+    > Why? [They are not finalized](https://tc39.github.io/process-document/), and they are subject to change or to be withdrawn entirely. We want to use JavaScript, and proposals are not JavaScript yet.
+
 **[⬆ back to top](#table-of-contents)**
 
 ## Testing
@@ -2745,13 +2804,13 @@ Other Style Guides
 
 ## Performance
 
-  - [On Layout & Web Performance](http://www.kellegous.com/j/2013/01/26/layout-performance/)
-  - [String vs Array Concat](http://jsperf.com/string-vs-array-concat/2)
-  - [Try/Catch Cost In a Loop](http://jsperf.com/try-catch-in-loop-cost)
-  - [Bang Function](http://jsperf.com/bang-function)
-  - [jQuery Find vs Context, Selector](http://jsperf.com/jquery-find-vs-context-sel/13)
-  - [innerHTML vs textContent for script text](http://jsperf.com/innerhtml-vs-textcontent-for-script-text)
-  - [Long String Concatenation](http://jsperf.com/ya-string-concat)
+  - [On Layout & Web Performance](https://www.kellegous.com/j/2013/01/26/layout-performance/)
+  - [String vs Array Concat](https://jsperf.com/string-vs-array-concat/2)
+  - [Try/Catch Cost In a Loop](https://jsperf.com/try-catch-in-loop-cost)
+  - [Bang Function](https://jsperf.com/bang-function)
+  - [jQuery Find vs Context, Selector](https://jsperf.com/jquery-find-vs-context-sel/13)
+  - [innerHTML vs textContent for script text](https://jsperf.com/innerhtml-vs-textcontent-for-script-text)
+  - [Long String Concatenation](https://jsperf.com/ya-string-concat)
   - [Are Javascript functions like `map()`, `reduce()`, and `filter()` optimized for traversing arrays?](https://www.quora.com/JavaScript-programming-language-Are-Javascript-functions-like-map-reduce-and-filter-already-optimized-for-traversing-array/answer/Quildreen-Motta)
   - Loading...
 
@@ -2781,7 +2840,7 @@ Other Style Guides
 **Other Style Guides**
 
   - [Google JavaScript Style Guide](https://google.github.io/styleguide/javascriptguide.xml)
-  - [jQuery Core Style Guidelines](http://contribute.jquery.org/style-guide/js/)
+  - [jQuery Core Style Guidelines](https://contribute.jquery.org/style-guide/js/)
   - [Principles of Writing Consistent, Idiomatic JavaScript](https://github.com/rwaldron/idiomatic.js)
 
 **Other Styles**
@@ -2793,7 +2852,7 @@ Other Style Guides
 
 **Further Reading**
 
-  - [Understanding JavaScript Closures](http://javascriptweblog.wordpress.com/2010/10/25/understanding-javascript-closures/) - Angus Croll
+  - [Understanding JavaScript Closures](https://javascriptweblog.wordpress.com/2010/10/25/understanding-javascript-closures/) - Angus Croll
   - [Basic JavaScript for the impatient programmer](http://www.2ality.com/2013/06/basic-javascript.html) - Dr. Axel Rauschmayer
   - [You Might Not Need jQuery](http://youmightnotneedjquery.com/) - Zack Bloom & Adam Schwartz
   - [ES6 Features](https://github.com/lukehoban/es6features) - Luke Hoban
@@ -2801,15 +2860,15 @@ Other Style Guides
 
 **Books**
 
-  - [JavaScript: The Good Parts](http://www.amazon.com/JavaScript-Good-Parts-Douglas-Crockford/dp/0596517742) - Douglas Crockford
-  - [JavaScript Patterns](http://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752) - Stoyan Stefanov
-  - [Pro JavaScript Design Patterns](http://www.amazon.com/JavaScript-Design-Patterns-Recipes-Problem-Solution/dp/159059908X)  - Ross Harmes and Dustin Diaz
-  - [High Performance Web Sites: Essential Knowledge for Front-End Engineers](http://www.amazon.com/High-Performance-Web-Sites-Essential/dp/0596529309) - Steve Souders
-  - [Maintainable JavaScript](http://www.amazon.com/Maintainable-JavaScript-Nicholas-C-Zakas/dp/1449327680) - Nicholas C. Zakas
-  - [JavaScript Web Applications](http://www.amazon.com/JavaScript-Web-Applications-Alex-MacCaw/dp/144930351X) - Alex MacCaw
-  - [Pro JavaScript Techniques](http://www.amazon.com/Pro-JavaScript-Techniques-John-Resig/dp/1590597273) - John Resig
-  - [Smashing Node.js: JavaScript Everywhere](http://www.amazon.com/Smashing-Node-js-JavaScript-Everywhere-Magazine/dp/1119962595) - Guillermo Rauch
-  - [Secrets of the JavaScript Ninja](http://www.amazon.com/Secrets-JavaScript-Ninja-John-Resig/dp/193398869X) - John Resig and Bear Bibeault
+  - [JavaScript: The Good Parts](https://www.amazon.com/JavaScript-Good-Parts-Douglas-Crockford/dp/0596517742) - Douglas Crockford
+  - [JavaScript Patterns](https://www.amazon.com/JavaScript-Patterns-Stoyan-Stefanov/dp/0596806752) - Stoyan Stefanov
+  - [Pro JavaScript Design Patterns](https://www.amazon.com/JavaScript-Design-Patterns-Recipes-Problem-Solution/dp/159059908X)  - Ross Harmes and Dustin Diaz
+  - [High Performance Web Sites: Essential Knowledge for Front-End Engineers](https://www.amazon.com/High-Performance-Web-Sites-Essential/dp/0596529309) - Steve Souders
+  - [Maintainable JavaScript](https://www.amazon.com/Maintainable-JavaScript-Nicholas-C-Zakas/dp/1449327680) - Nicholas C. Zakas
+  - [JavaScript Web Applications](https://www.amazon.com/JavaScript-Web-Applications-Alex-MacCaw/dp/144930351X) - Alex MacCaw
+  - [Pro JavaScript Techniques](https://www.amazon.com/Pro-JavaScript-Techniques-John-Resig/dp/1590597273) - John Resig
+  - [Smashing Node.js: JavaScript Everywhere](https://www.amazon.com/Smashing-Node-js-JavaScript-Everywhere-Magazine/dp/1119962595) - Guillermo Rauch
+  - [Secrets of the JavaScript Ninja](https://www.amazon.com/Secrets-JavaScript-Ninja-John-Resig/dp/193398869X) - John Resig and Bear Bibeault
   - [Human JavaScript](http://humanjavascript.com/) - Henrik Joreteg
   - [Superhero.js](http://superherojs.com/) - Kim Joar Bekkelund, Mads Mobæk, & Olav Bjorkoy
   - [JSBooks](http://jsbooks.revolunet.com/) - Julien Bouquillon
@@ -2822,7 +2881,7 @@ Other Style Guides
 
   - [DailyJS](http://dailyjs.com/)
   - [JavaScript Weekly](http://javascriptweekly.com/)
-  - [JavaScript, JavaScript...](http://javascriptweblog.wordpress.com/)
+  - [JavaScript, JavaScript...](https://javascriptweblog.wordpress.com/)
   - [Bocoup Weblog](https://bocoup.com/weblog)
   - [Adequately Good](http://www.adequatelygood.com/)
   - [NCZOnline](https://www.nczonline.net/)
@@ -2834,6 +2893,7 @@ Other Style Guides
 
 **Podcasts**
 
+  - [JavaScript Air](https://javascriptair.com/)
   - [JavaScript Jabber](https://devchat.tv/js-jabber/)
 
 
@@ -2883,6 +2943,7 @@ Other Style Guides
   - **JSSolutions**: [JSSolutions/javascript](https://github.com/JSSolutions/javascript)
   - **KickorStick**: [kickorstick/javascript](https://github.com/kickorstick/javascript)
   - **Kinetica Solutions**: [kinetica/javascript](https://github.com/kinetica/Javascript-style-guide)
+  - **M2GEN**: [M2GEN/javascript](https://github.com/M2GEN/javascript)
   - **Mighty Spring**: [mightyspring/javascript](https://github.com/mightyspring/javascript)
   - **MinnPost**: [MinnPost/javascript](https://github.com/MinnPost/javascript)
   - **MitocGroup**: [MitocGroup/javascript](https://github.com/MitocGroup/javascript)
@@ -2904,6 +2965,7 @@ Other Style Guides
   - **Shutterfly**: [shutterfly/javascript](https://github.com/shutterfly/javascript)
   - **Springload**: [springload/javascript](https://github.com/springload/javascript)
   - **StratoDem Analytics**: [stratodem/javascript](https://github.com/stratodem/javascript)
+  - **SteelKiwi Development**: [steelkiwi/javascript](https://github.com/steelkiwi/javascript)
   - **StudentSphere**: [studentsphere/javascript](https://github.com/studentsphere/guide-javascript)
   - **SysGarage**: [sysgarage/javascript-style-guide](https://github.com/sysgarage/javascript-style-guide)
   - **Syzygy Warsaw**: [syzygypl/javascript](https://github.com/syzygypl/javascript)

css-in-javascript/README.md

@@ -0,0 +1,433 @@
+# Airbnb CSS-in-JavaScript Style Guide
+
+*A mostly reasonable approach to CSS-in-JavaScript
+
+## Table of Contents
+
+1. [Naming](#naming)
+1. [Ordering](#ordering)
+1. [Nesting](#nesting)
+1. [Inline](#inline)
+1. [Themes](#themes)
+
+## Naming
+
+  - Use camelCase for object keys (i.e. "selectors").
+
+  > Why? We access these keys as properties on the `styles` object in the component, so it is most convenient to use camelCase.
+
+    ```js
+    // bad
+    {
+      'bermuda-triangle': {
+        display: 'none',
+      },
+    }
+
+    // good
+    {
+      bermudaTriangle: {
+        display: 'none',
+      },
+    }
+    ```
+
+  - Use an underscore for modifiers to other styles.
+
+  > Why? Similar to BEM, this naming convention makes it clear that the styles are intended to modify the element preceded by the underscore. Underscores do not need to be quoted, so they are preferred over other characters, such as dashes.
+
+    ```js
+    // bad
+    {
+      bruceBanner: {
+        color: 'pink',
+        transition: 'color 10s',
+      },
+
+      bruceBannerTheHulk: {
+        color: 'green',
+      },
+    }
+
+    // good
+    {
+      bruceBanner: {
+        color: 'pink',
+        transition: 'color 10s',
+      },
+
+      bruceBanner_theHulk: {
+        color: 'green',
+      },
+    }
+    ```
+
+  - Use `selectorName_fallback` for sets of fallback styles.
+
+  > Why? Similar to modifiers, keeping the naming consistent helps reveal the relationship of these styles to the styles that override them in more adequate browsers.
+
+    ```js
+    // bad
+    {
+      muscles: {
+        display: 'flex',
+      },
+
+      muscles_sadBears: {
+        width: '100%',
+      },
+    }
+
+    // good
+    {
+      muscles: {
+        display: 'flex',
+      },
+
+      muscles_fallback: {
+        width: '100%',
+      },
+    }
+    ```
+
+  - Use a separate selector for sets of fallback styles.
+
+  > Why? Keeping fallback styles contained in a separate object clarifies their purpose, which improves readability.
+
+    ```js
+    // bad
+    {
+      muscles: {
+        display: 'flex',
+      },
+
+      left: {
+        flexGrow: 1,
+        display: 'inline-block',
+      },
+
+      right: {
+        display: 'inline-block',
+      },
+    }
+
+    // good
+    {
+      muscles: {
+        display: 'flex',
+      },
+
+      left: {
+        flexGrow: 1,
+      },
+
+      left_fallback: {
+        display: 'inline-block',
+      },
+
+      right_fallback: {
+        display: 'inline-block',
+      },
+    }
+    ```
+
+  - Use device-agnostic names (e.g. "small", "medium", and "large") to name media query breakpoints.
+
+  > Why? Commonly used names like "phone", "tablet", and "desktop" do not match the characteristics of the devices in the real world. Using these names sets the wrong expectations.
+
+    ```js
+    // bad
+    const breakpoints = {
+      mobile: '@media (max-width: 639px)',
+      tablet: '@media (max-width: 1047px)',
+      desktop: '@media (min-width: 1048px)',
+    };
+
+    // good
+    const breakpoints = {
+      small: '@media (max-width: 639px)',
+      medium: '@media (max-width: 1047px)',
+      large: '@media (min-width: 1048px)',
+    };
+    ```
+
+## Ordering
+
+  - Define styles after the component.
+
+  > Why? We use a higher-order component to theme our styles, which is naturally used after the component definition. Passing the styles object directly to this function reduces indirection.
+
+    ```jsx
+    // bad
+    const styles = {
+      container: {
+        display: 'inline-block',
+      },
+    };
+
+    function MyComponent({ styles }) {
+      return (
+        <div {...css(styles.container)}>
+          Never doubt that a small group of thoughtful, committed citizens can
+          change the world. Indeed, it’s the only thing that ever has.
+        </div>
+      );
+    }
+
+    export default withStyles(() => styles)(MyComponent);
+
+
+    // good
+    function MyComponent({ styles }) {
+      return (
+        <div {...css(styles.container)}>
+          Never doubt that a small group of thoughtful, committed citizens can
+          change the world. Indeed, it’s the only thing that ever has.
+        </div>
+      );
+    }
+
+    export default withStyles(() => ({
+      container: {
+        display: 'inline-block',
+      },
+    }))(MyComponent);
+    ```
+
+## Nesting
+
+  - Leave a blank line between adjacent blocks at the same indentation level.
+
+  > Why? The whitespace improves readability and reduces the likelihood of merge conflicts.
+
+    ```js
+    // bad
+    {
+      bigBang: {
+        display: 'inline-block',
+        '::before': {
+          content: "''",
+        },
+      },
+      universe: {
+        border: 'none',
+      },
+    }
+
+    // good
+    {
+      bigBang: {
+        display: 'inline-block',
+
+        '::before': {
+          content: "''",
+        },
+      },
+
+      universe: {
+        border: 'none',
+      },
+    }
+    ```
+
+## Inline
+
+  - Use inline styles for styles that have a high cardinality (e.g. uses the value of a prop) and not for styles that have a low cardinality.
+
+  > Why? Generating themed stylesheets can be expensive, so they are best for discrete sets of styles.
+
+    ```jsx
+    // bad
+    export default function MyComponent({ spacing }) {
+      return (
+        <div style={{ display: 'table', margin: spacing }} />
+      );
+    }
+
+    // good
+    function MyComponent({ styles, spacing }) {
+      return (
+        <div {...css(styles.periodic, { margin: spacing })} />
+      );
+    }
+    export default withStyles(() => ({
+      periodic: {
+        display: 'table',
+      },
+    }))(MyComponent);
+    ```
+
+## Themes
+
+  - Use an abstraction layer such as [react-with-styles](https://github.com/airbnb/react-with-styles) that enables theming. *react-with-styles gives us things like `withStyles()`, `ThemedStyleSheet`, and `css()` which are used in some of the examples in this document.*
+
+  > Why? It is useful to have a set of shared variables for styling your components. Using an abstraction layer makes this more convenient. Additionally, this can help prevent your components from being tightly coupled to any particular underlying implementation, which gives you more freedom.
+
+  - Define colors only in themes.
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      chuckNorris: {
+        color: '#bada55',
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ color }) => ({
+      chuckNorris: {
+        color: color.badass,
+      },
+    }))(MyComponent);
+    ```
+
+  - Define fonts only in themes.
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      towerOfPisa: {
+        fontStyle: 'italic',
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ font }) => ({
+      towerOfPisa: {
+        fontStyle: font.italic,
+      },
+    }))(MyComponent);
+    ```
+
+  - Define fonts as sets of related styles.
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      towerOfPisa: {
+        fontFamily: 'Italiana, "Times New Roman", serif',
+        fontSize: '2em',
+        fontStyle: 'italic',
+        lineHeight: 1.5,
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ font }) => ({
+      towerOfPisa: {
+        ...font.italian,
+      },
+    }))(MyComponent);
+    ```
+
+  - Define base grid units in theme (either as a value or a function that takes a multiplier).
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      rip: {
+        bottom: '-6912px', // 6 feet
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ units }) => ({
+      rip: {
+        bottom: units(864), // 6 feet, assuming our unit is 8px
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ unit }) => ({
+      rip: {
+        bottom: 864 * unit, // 6 feet, assuming our unit is 8px
+      },
+    }))(MyComponent);
+    ```
+
+  - Define media queries only in themes.
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      container: {
+        width: '100%',
+
+        '@media (max-width: 1047px)': {
+          width: '50%',
+        },
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ breakpoint }) => ({
+      container: {
+        width: '100%',
+
+        [breakpoint.medium]: {
+          width: '50%',
+        },
+      },
+    }))(MyComponent);
+    ```
+
+  - Define tricky fallback properties in themes.
+
+  > Why? Many CSS-in-JavaScript implementations merge style objects together which makes specifying fallbacks for the same property (e.g. `display`) a little tricky. To keep the approach unified, put these fallbacks in the theme.
+
+    ```js
+    // bad
+    export default withStyles(() => ({
+      .muscles {
+        display: 'flex',
+      },
+
+      .muscles_fallback {
+        'display ': 'table',
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ fallbacks }) => ({
+      .muscles {
+        display: 'flex',
+      },
+
+      .muscles_fallback {
+        [fallbacks.display]: 'table',
+      },
+    }))(MyComponent);
+
+    // good
+    export default withStyles(({ fallback }) => ({
+      .muscles {
+        display: 'flex',
+      },
+
+      .muscles_fallback {
+        [fallback('display')]: 'table',
+      },
+    }))(MyComponent);
+    ```
+
+  - Create as few custom themes as possible. Many applications may only have one theme.
+
+  - Namespace custom theme settings under a nested object with a unique and descriptive key.
+
+    ```js
+    // bad
+    ThemedStyleSheet.registerTheme('mySection', {
+      mySectionPrimaryColor: 'green',
+    });
+
+    // good
+    ThemedStyleSheet.registerTheme('mySection', {
+      mySection: {
+        primaryColor: 'green',
+      },
+    });
+    ```
+
+---
+
+CSS puns adapted from [Saijo George](http://saijogeorge.com/css-puns/).

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

@@ -1,3 +1,40 @@
+7.1.0 / 2016-09-11
+==================
+ - [minor] enable `arrow-parens` rule
+
+7.0.1 / 2016-09-10
+==================
+ - [patch] loosen `max-len` by ignoring strings
+ - [deps] update to `eslint` `v3.5.0`
+
+7.0.0 / 2016-09-06
+==================
+ - [breaking] Add no-plusplus in style.js and added explanation in README (#1012)
+
+6.0.0 / 2016-09-06
+==================
+ - [breaking] `valid-typeof`: enable `requireStringLiterals` option
+ - [breaking] enable `class-methods-use-this`
+ - [breaking] enable `symbol-description`
+ - [breaking] enable `no-bitwise`
+ - [breaking] enable `no-tabs`
+ - [breaking] enable `func-call-spacing`
+ - [breaking] enable `no-template-curly-in-string`
+ - [patch] remove redundant `DebuggerStatement` from `no-restricted-syntax` (#1031)
+ - [deps] update `eslint`, `eslint-find-rules`, `eslint-plugin-import`
+ - Update `ecmaVersion` to `2016`
+
+5.0.3 / 2016-08-21
+==================
+ - [fix] correct `import/extensions` list (#1013)
+ - [refactor] Changed ESLint rule configs to use 'off', 'warn', and 'error' instead of numbers for better readability (#946)
+ - [deps] update `eslint`, `eslint-plugin-react`
+
+5.0.2 / 2016-08-12
+==================
+ - [deps] update `eslint`, `eslint-find-rules`, `eslint-plugin-import`
+ - [tests] add `safe-publish-latest` to `prepublish`
+
 5.0.1 / 2016-07-29
 ==================
  - [patch] `no-unused-expressions`: flesh out options

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

@@ -23,7 +23,7 @@ Our default export contains all of our ESLint rules, including ECMAScript 6+. It
   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
+    npm install --save-dev eslint-config-airbnb-base eslint@^#.#.# eslint-plugin-import@^#.#.#
   ```
 
 2. Add `"extends": "airbnb-base"` to your .eslintrc

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

@@ -9,10 +9,10 @@ module.exports = {
     './rules/imports',
   ].map(require.resolve),
   parserOptions: {
-    ecmaVersion: 7,
+    ecmaVersion: 2016,
     sourceType: 'module',
   },
   rules: {
-    strict: 2,
+    strict: 'error',
   }
 };

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

@@ -16,6 +16,7 @@ module.exports = {
   ecmaFeatures: {},
   globals: {},
   rules: {
-    'comma-dangle': [2, 'never']
+    'comma-dangle': ['error', 'never'],
+    'prefer-numeric-literals': 'off',
   }
 };

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

@@ -1,12 +1,12 @@
 {
   "name": "eslint-config-airbnb-base",
-  "version": "5.0.1",
+  "version": "7.1.0",
   "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)",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent tests-only",
     "travis": "npm run --silent test"
@@ -47,15 +47,16 @@
   "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",
+    "eslint": "^3.5.0",
+    "eslint-find-rules": "^1.13.1",
+    "eslint-plugin-import": "^1.14.0",
     "in-publish": "^2.0.0",
+    "safe-publish-latest": "^1.0.1",
     "tape": "^4.6.0"
   },
   "peerDependencies": {
-    "eslint": "^3.2.0",
-    "eslint-plugin-import": "^1.12.0"
+    "eslint": "^3.5.0",
+    "eslint-plugin-import": "^1.14.0"
   },
   "engines": {
     "node": ">= 4"

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

@@ -1,61 +1,65 @@
 module.exports = {
   rules: {
     // enforces getter/setter pairs in objects
-    'accessor-pairs': 0,
+    'accessor-pairs': 'off',
 
     // enforces return statements in callbacks of array's methods
     // http://eslint.org/docs/rules/array-callback-return
-    'array-callback-return': 2,
+    'array-callback-return': 'error',
 
     // treat var statements as if they were block scoped
-    'block-scoped-var': 2,
+    'block-scoped-var': 'error',
 
     // specify the maximum cyclomatic complexity allowed in a program
-    complexity: [0, 11],
+    complexity: ['off', 11],
+
+    // enforce that class methods use "this"
+    // http://eslint.org/docs/rules/class-methods-use-this
+    'class-methods-use-this': 'error',
 
     // require return statements to either always or never specify values
-    'consistent-return': 2,
+    'consistent-return': 'error',
 
     // specify curly brace conventions for all control statements
-    curly: [2, 'multi-line'],
+    curly: ['error', 'multi-line'],
 
     // require default case in switch statements
-    'default-case': [2, { commentPattern: '^no default$' }],
+    'default-case': ['error', { commentPattern: '^no default$' }],
 
     // encourages use of dot notation whenever possible
-    'dot-notation': [2, { allowKeywords: true }],
+    'dot-notation': ['error', { allowKeywords: true }],
 
     // enforces consistent newlines before or after dots
     // http://eslint.org/docs/rules/dot-location
-    'dot-location': [2, 'property'],
+    'dot-location': ['error', 'property'],
 
     // require the use of === and !==
     // http://eslint.org/docs/rules/eqeqeq
-    eqeqeq: [2, 'allow-null'],
+    eqeqeq: ['error', 'allow-null'],
 
     // make sure for-in loops have an if statement
-    'guard-for-in': 2,
+    'guard-for-in': 'error',
 
     // disallow the use of alert, confirm, and prompt
-    'no-alert': 1,
+    'no-alert': 'warn',
 
     // disallow use of arguments.caller or arguments.callee
-    'no-caller': 2,
+    'no-caller': 'error',
 
     // disallow lexical declarations in case/default clauses
     // http://eslint.org/docs/rules/no-case-declarations.html
-    'no-case-declarations': 2,
+    'no-case-declarations': 'error',
 
     // disallow division operators explicitly at beginning of regular expression
     // http://eslint.org/docs/rules/no-div-regex
-    'no-div-regex': 0,
+    'no-div-regex': 'off',
 
     // disallow else after a return in an if
-    'no-else-return': 2,
+    'no-else-return': 'error',
 
     // disallow empty functions, except for standalone funcs/arrows
     // http://eslint.org/docs/rules/no-empty-function
-    'no-empty-function': [2, {
+    'no-empty-function': ['error', {
       allow: [
         'arrowFunctions',
         'functions',
@@ -65,33 +69,39 @@ module.exports = {
 
     // disallow empty destructuring patterns
     // http://eslint.org/docs/rules/no-empty-pattern
-    'no-empty-pattern': 2,
+    'no-empty-pattern': 'error',
 
     // disallow comparisons to null without a type-checking operator
-    'no-eq-null': 0,
+    'no-eq-null': 'off',
 
     // disallow use of eval()
-    'no-eval': 2,
+    'no-eval': 'error',
 
     // disallow adding to native types
-    'no-extend-native': 2,
+    'no-extend-native': 'error',
 
     // disallow unnecessary function binding
-    'no-extra-bind': 2,
+    'no-extra-bind': 'error',
 
     // disallow Unnecessary Labels
     // http://eslint.org/docs/rules/no-extra-label
-    'no-extra-label': 2,
+    'no-extra-label': 'error',
 
     // disallow fallthrough of case statements
-    'no-fallthrough': 2,
+    'no-fallthrough': 'error',
 
     // disallow the use of leading or trailing decimal points in numeric literals
-    'no-floating-decimal': 2,
+    'no-floating-decimal': 'error',
+
+    // disallow reassignments of native objects or read-only globals
+    // http://eslint.org/docs/rules/no-global-assign
+    'no-global-assign': ['error', { exceptions: [] }],
+    // deprecated in favor of no-global-assign
+    'no-native-reassign': 'off',
 
     // disallow implicit type conversions
     // http://eslint.org/docs/rules/no-implicit-coercion
-    'no-implicit-coercion': [0, {
+    'no-implicit-coercion': ['off', {
       boolean: false,
       number: true,
       string: true,
@@ -100,29 +110,29 @@ module.exports = {
 
     // disallow var and named functions in global scope
     // http://eslint.org/docs/rules/no-implicit-globals
-    'no-implicit-globals': 0,
+    'no-implicit-globals': 'off',
 
     // disallow use of eval()-like methods
-    'no-implied-eval': 2,
+    'no-implied-eval': 'error',
 
     // disallow this keywords outside of classes or class-like objects
-    'no-invalid-this': 0,
+    'no-invalid-this': 'off',
 
     // disallow usage of __iterator__ property
-    'no-iterator': 2,
+    'no-iterator': 'error',
 
     // disallow use of labels for anything other then loops and switches
-    'no-labels': [2, { allowLoop: false, allowSwitch: false }],
+    'no-labels': ['error', { allowLoop: false, allowSwitch: false }],
 
     // disallow unnecessary nested blocks
-    'no-lone-blocks': 2,
+    'no-lone-blocks': 'error',
 
     // disallow creation of functions within loops
-    'no-loop-func': 2,
+    'no-loop-func': 'error',
 
     // disallow magic numbers
     // http://eslint.org/docs/rules/no-magic-numbers
-    'no-magic-numbers': [0, {
+    'no-magic-numbers': ['off', {
       ignore: [],
       ignoreArrayIndexes: true,
       enforceConst: true,
@@ -130,106 +140,103 @@ module.exports = {
     }],
 
     // disallow use of multiple spaces
-    'no-multi-spaces': 2,
+    'no-multi-spaces': 'error',
 
     // disallow use of multiline strings
-    'no-multi-str': 2,
-
-    // disallow reassignments of native objects
-    'no-native-reassign': 2,
+    'no-multi-str': 'error',
 
     // disallow use of new operator when not part of the assignment or comparison
-    'no-new': 2,
+    'no-new': 'error',
 
     // disallow use of new operator for Function object
-    'no-new-func': 2,
+    'no-new-func': 'error',
 
     // disallows creating new instances of String, Number, and Boolean
-    'no-new-wrappers': 2,
+    'no-new-wrappers': 'error',
 
     // disallow use of (old style) octal literals
-    'no-octal': 2,
+    'no-octal': 'error',
 
     // disallow use of octal escape sequences in string literals, such as
     // var foo = 'Copyright \251';
-    'no-octal-escape': 2,
+    'no-octal-escape': 'error',
 
     // 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 }],
+    'no-param-reassign': ['error', { props: true }],
 
     // disallow usage of __proto__ property
-    'no-proto': 2,
+    'no-proto': 'error',
 
     // disallow declaring the same variable more then once
-    'no-redeclare': 2,
+    'no-redeclare': 'error',
 
     // disallow use of assignment in return statement
-    'no-return-assign': 2,
+    'no-return-assign': 'error',
 
     // disallow use of `javascript:` urls.
-    'no-script-url': 2,
+    'no-script-url': 'error',
 
     // disallow self assignment
     // http://eslint.org/docs/rules/no-self-assign
-    'no-self-assign': 2,
+    'no-self-assign': 'error',
 
     // disallow comparisons where both sides are exactly the same
-    'no-self-compare': 2,
+    'no-self-compare': 'error',
 
     // disallow use of comma operator
-    'no-sequences': 2,
+    'no-sequences': 'error',
 
     // restrict what can be thrown as an exception
-    'no-throw-literal': 2,
+    'no-throw-literal': 'error',
 
     // disallow unmodified conditions of loops
     // http://eslint.org/docs/rules/no-unmodified-loop-condition
-    'no-unmodified-loop-condition': 0,
+    'no-unmodified-loop-condition': 'off',
 
     // disallow usage of expressions in statement position
-    'no-unused-expressions': [2, {
+    'no-unused-expressions': ['error', {
       allowShortCircuit: false,
       allowTernary: false,
     }],
 
     // disallow unused labels
     // http://eslint.org/docs/rules/no-unused-labels
-    'no-unused-labels': 2,
+    'no-unused-labels': 'error',
 
     // disallow unnecessary .call() and .apply()
-    'no-useless-call': 0,
+    'no-useless-call': 'off',
 
     // disallow useless string concatenation
     // http://eslint.org/docs/rules/no-useless-concat
-    'no-useless-concat': 2,
+    'no-useless-concat': 'error',
 
     // disallow unnecessary string escaping
     // http://eslint.org/docs/rules/no-useless-escape
-    'no-useless-escape': 2,
+    'no-useless-escape': 'error',
 
     // disallow use of void operator
     // http://eslint.org/docs/rules/no-void
-    'no-void': 2,
+    'no-void': 'error',
 
     // disallow usage of configurable warning terms in comments: e.g. todo
-    'no-warning-comments': [0, { terms: ['todo', 'fixme', 'xxx'], location: 'start' }],
+    'no-warning-comments': ['off', { terms: ['todo', 'fixme', 'xxx'], location: 'start' }],
 
     // disallow use of the with statement
-    'no-with': 2,
+    'no-with': 'error',
 
     // require use of the second argument for parseInt()
-    radix: 2,
+    radix: 'error',
 
     // requires to declare all vars on top of their containing scope
-    'vars-on-top': 2,
+    'vars-on-top': 'error',
 
     // require immediate function invocation to be wrapped in parentheses
     // http://eslint.org/docs/rules/wrap-iife.html
-    'wrap-iife': [2, 'outside'],
+    'wrap-iife': ['error', 'outside'],
 
     // require or disallow Yoda conditions
-    yoda: 2
+    yoda: 'error'
   }
 };

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

@@ -1,103 +1,112 @@
 module.exports = {
   rules: {
     // require trailing commas in multiline object literals
-    'comma-dangle': [2, 'always-multiline'],
+    'comma-dangle': ['error', 'always-multiline'],
 
     // disallow assignment in conditional expressions
-    'no-cond-assign': [2, 'always'],
+    'no-cond-assign': ['error', 'always'],
 
     // disallow use of console
-    'no-console': 1,
+    'no-console': 'warn',
 
     // disallow use of constant expressions in conditions
-    'no-constant-condition': 1,
+    'no-constant-condition': 'warn',
 
     // disallow control characters in regular expressions
-    'no-control-regex': 2,
+    'no-control-regex': 'error',
 
     // disallow use of debugger
-    'no-debugger': 2,
+    'no-debugger': 'error',
 
     // disallow duplicate arguments in functions
-    'no-dupe-args': 2,
+    'no-dupe-args': 'error',
 
     // disallow duplicate keys when creating object literals
-    'no-dupe-keys': 2,
+    'no-dupe-keys': 'error',
 
     // disallow a duplicate case label.
-    'no-duplicate-case': 2,
+    'no-duplicate-case': 'error',
 
     // disallow empty statements
-    'no-empty': 2,
+    'no-empty': 'error',
 
     // disallow the use of empty character classes in regular expressions
-    'no-empty-character-class': 2,
+    'no-empty-character-class': 'error',
 
     // disallow assigning to the exception in a catch block
-    'no-ex-assign': 2,
+    'no-ex-assign': 'error',
 
     // disallow double-negation boolean casts in a boolean context
     // http://eslint.org/docs/rules/no-extra-boolean-cast
-    'no-extra-boolean-cast': 2,
+    'no-extra-boolean-cast': 'error',
 
     // disallow unnecessary parentheses
     // http://eslint.org/docs/rules/no-extra-parens
-    'no-extra-parens': [0, 'all', {
+    'no-extra-parens': ['off', 'all', {
       conditionalAssign: true,
       nestedBinaryExpressions: false,
       returnAssign: false,
     }],
 
     // disallow unnecessary semicolons
-    'no-extra-semi': 2,
+    'no-extra-semi': 'error',
 
     // disallow overwriting functions written as function declarations
-    'no-func-assign': 2,
+    'no-func-assign': 'error',
 
     // disallow function or variable declarations in nested blocks
-    'no-inner-declarations': 2,
+    'no-inner-declarations': 'error',
 
     // disallow invalid regular expression strings in the RegExp constructor
-    'no-invalid-regexp': 2,
+    'no-invalid-regexp': 'error',
 
     // 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,
+    'no-irregular-whitespace': 'error',
 
     // disallow the use of object properties of the global object (Math and JSON) as functions
-    'no-obj-calls': 2,
+    'no-obj-calls': 'error',
 
     // disallow use of Object.prototypes builtins directly
     // http://eslint.org/docs/rules/no-prototype-builtins
-    'no-prototype-builtins': 2,
+    'no-prototype-builtins': 'error',
 
     // disallow multiple spaces in a regular expression literal
-    'no-regex-spaces': 2,
+    'no-regex-spaces': 'error',
 
     // disallow sparse arrays
-    'no-sparse-arrays': 2,
+    'no-sparse-arrays': 'error',
+
+    // Disallow template literal placeholder syntax in regular strings
+    // http://eslint.org/docs/rules/no-template-curly-in-string
+    'no-template-curly-in-string': 'error',
 
     // Avoid code that looks like two expressions but is actually one
     // http://eslint.org/docs/rules/no-unexpected-multiline
-    'no-unexpected-multiline': 2,
+    'no-unexpected-multiline': 'error',
 
     // disallow unreachable statements after a return, throw, continue, or break statement
-    'no-unreachable': 2,
+    'no-unreachable': 'error',
 
     // disallow return/throw/break/continue inside finally blocks
     // http://eslint.org/docs/rules/no-unsafe-finally
-    'no-unsafe-finally': 2,
+    'no-unsafe-finally': 'error',
+
+    // disallow negating the left operand of relational operators
+    // http://eslint.org/docs/rules/no-unsafe-negation
+    'no-unsafe-negation': 'error',
+    // disallow negation of the left operand of an in expression
+    // deprecated in favor of no-unsafe-negation
+    'no-negated-in-lhs': 'off',
 
     // disallow comparisons with the value NaN
-    'use-isnan': 2,
+    'use-isnan': 'error',
 
     // ensure JSDoc comments are valid
     // http://eslint.org/docs/rules/valid-jsdoc
-    'valid-jsdoc': 0,
+    'valid-jsdoc': 'off',
 
     // ensure that the results of typeof are compared against a valid string
-    'valid-typeof': 2
+    // http://eslint.org/docs/rules/valid-typeof
+    'valid-typeof': ['error', { requireStringLiterals: true }],
   }
 };

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

@@ -14,132 +14,147 @@ module.exports = {
   rules: {
     // enforces no braces where they can be omitted
     // http://eslint.org/docs/rules/arrow-body-style
-    'arrow-body-style': [2, 'as-needed'],
+    // TODO: enable requireReturnForObjectLiteral?
+    'arrow-body-style': ['error', 'as-needed', {
+      requireReturnForObjectLiteral: false,
+    }],
 
     // require parens in arrow function arguments
-    'arrow-parens': 0,
+    // http://eslint.org/docs/rules/arrow-parens
+    'arrow-parens': ['error', 'as-needed', {
+      requireForBlockBody: true,
+    }],
 
     // require space before/after arrow function's arrow
     // http://eslint.org/docs/rules/arrow-spacing
-    'arrow-spacing': [2, { before: true, after: true }],
+    'arrow-spacing': ['error', { before: true, after: true }],
 
     // verify super() callings in constructors
-    'constructor-super': 2,
+    'constructor-super': 'error',
 
     // enforce the spacing around the * in generator functions
     // http://eslint.org/docs/rules/generator-star-spacing
-    'generator-star-spacing': [2, { before: false, after: true }],
+    'generator-star-spacing': ['error', { before: false, after: true }],
 
     // disallow modifying variables of class declarations
     // http://eslint.org/docs/rules/no-class-assign
-    'no-class-assign': 2,
+    'no-class-assign': 'error',
 
     // disallow arrow functions where they could be confused with comparisons
     // http://eslint.org/docs/rules/no-confusing-arrow
-    'no-confusing-arrow': [2, {
+    'no-confusing-arrow': ['error', {
       allowParens: true,
     }],
 
     // disallow modifying variables that are declared using const
-    'no-const-assign': 2,
+    'no-const-assign': 'error',
 
     // disallow duplicate class members
     // http://eslint.org/docs/rules/no-dupe-class-members
-    'no-dupe-class-members': 2,
+    'no-dupe-class-members': 'error',
 
     // disallow importing from the same path more than once
     // http://eslint.org/docs/rules/no-duplicate-imports
-    'no-duplicate-imports': 2,
+    'no-duplicate-imports': 'error',
 
     // disallow symbol constructor
     // http://eslint.org/docs/rules/no-new-symbol
-    'no-new-symbol': 2,
+    'no-new-symbol': 'error',
 
     // disallow specific imports
     // http://eslint.org/docs/rules/no-restricted-imports
-    'no-restricted-imports': 0,
+    'no-restricted-imports': 'off',
 
     // disallow to use this/super before super() calling in constructors.
     // http://eslint.org/docs/rules/no-this-before-super
-    'no-this-before-super': 2,
+    'no-this-before-super': 'error',
 
     // disallow useless computed property keys
     // http://eslint.org/docs/rules/no-useless-computed-key
-    'no-useless-computed-key': 2,
+    'no-useless-computed-key': 'error',
 
     // disallow unnecessary constructor
     // http://eslint.org/docs/rules/no-useless-constructor
-    'no-useless-constructor': 2,
+    'no-useless-constructor': 'error',
 
     // disallow renaming import, export, and destructured assignments to the same name
     // http://eslint.org/docs/rules/no-useless-rename
-    'no-useless-rename': [2, {
+    'no-useless-rename': ['error', {
       ignoreDestructuring: false,
       ignoreImport: false,
       ignoreExport: false,
     }],
 
     // require let or const instead of var
-    'no-var': 2,
+    'no-var': 'error',
 
     // require method and property shorthand syntax for object literals
     // http://eslint.org/docs/rules/object-shorthand
-    'object-shorthand': [2, 'always', {
+    'object-shorthand': ['error', 'always', {
       ignoreConstructors: false,
       avoidQuotes: true,
     }],
 
     // suggest using arrow functions as callbacks
-    'prefer-arrow-callback': [2, {
+    'prefer-arrow-callback': ['error', {
       allowNamedFunctions: false,
       allowUnboundThis: true,
     }],
 
     // suggest using of const declaration for variables that are never modified after declared
-    'prefer-const': [2, {
+    'prefer-const': ['error', {
       destructuring: 'any',
       ignoreReadBeforeAssign: true,
     }],
 
+    // disallow parseInt() in favor of binary, octal, and hexadecimal literals
+    // http://eslint.org/docs/rules/prefer-numeric-literals
+    // TODO: enable, semver-major
+    'prefer-numeric-literals': 'off',
+
     // suggest using Reflect methods where applicable
     // http://eslint.org/docs/rules/prefer-reflect
-    // TODO: enable
-    'prefer-reflect': 0,
+    // TODO: enable?
+    'prefer-reflect': 'off',
 
     // use rest parameters instead of arguments
     // http://eslint.org/docs/rules/prefer-rest-params
-    'prefer-rest-params': 2,
+    'prefer-rest-params': 'error',
 
     // suggest using the spread operator instead of .apply()
     // http://eslint.org/docs/rules/prefer-spread
-    'prefer-spread': 2,
+    'prefer-spread': 'error',
 
     // suggest using template literals instead of string concatenation
     // http://eslint.org/docs/rules/prefer-template
-    'prefer-template': 2,
+    'prefer-template': 'error',
 
     // disallow generator functions that do not have yield
     // http://eslint.org/docs/rules/require-yield
-    'require-yield': 2,
+    'require-yield': 'error',
 
     // enforce spacing between object rest-spread
     // http://eslint.org/docs/rules/rest-spread-spacing
-    'rest-spread-spacing': [2, 'never'],
+    'rest-spread-spacing': ['error', 'never'],
 
     // import sorting
     // http://eslint.org/docs/rules/sort-imports
-    'sort-imports': [0, {
+    'sort-imports': ['off', {
       ignoreCase: false,
       ignoreMemberSort: false,
       memberSyntaxSortOrder: ['none', 'all', 'multiple', 'single'],
     }],
 
+    // require a Symbol description
+    // http://eslint.org/docs/rules/symbol-description
+    'symbol-description': 'error',
+
     // enforce usage of spacing in template strings
     // http://eslint.org/docs/rules/template-curly-spacing
-    'template-curly-spacing': 2,
+    'template-curly-spacing': 'error',
 
     // enforce spacing around the * in yield* expressions
     // http://eslint.org/docs/rules/yield-star-spacing
-    'yield-star-spacing': [2, 'after']
+    'yield-star-spacing': ['error', 'after']
   }
 };

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

@@ -17,7 +17,8 @@ module.exports = {
       }
     },
     'import/extensions': [
-      'node_modules',
+      '.js',
+      '.jsx',
     ],
     'import/core-modules': [
     ],
@@ -32,101 +33,101 @@ module.exports = {
 
     // 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 }],
+    'import/no-unresolved': ['error', { 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,
+    'import/named': 'off',
 
     // 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,
+    'import/default': 'off',
 
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/namespace.md
-    'import/namespace': 0,
+    'import/namespace': 'off',
 
     // 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,
+    'import/export': 'error',
 
     // 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,
+    'import/no-named-as-default': 'error',
 
     // 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,
+    'import/no-named-as-default-member': 'error',
 
     // 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,
+    'import/no-deprecated': 'off',
 
     // 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, {
+    'import/no-extraneous-dependencies': ['error', {
       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,
+    'import/no-mutable-exports': 'error',
 
     // Module systems:
 
     // disallow require()
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-commonjs.md
-    'import/no-commonjs': 0,
+    'import/no-commonjs': 'off',
 
     // disallow AMD require/define
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-amd.md
-    'import/no-amd': 2,
+    'import/no-amd': 'error',
 
     // 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,
+    'import/no-nodejs-modules': 'off',
 
     // 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'],
+    'import/imports-first': ['error', 'absolute-first'],
 
     // disallow duplicate imports
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
-    'import/no-duplicates': 2,
+    'import/no-duplicates': 'error',
 
     // disallow namespace imports
     // TODO: enable?
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-namespace.md
-    'import/no-namespace': 0,
+    'import/no-namespace': 'off',
 
     // 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'],
+    'import/extensions': ['off', '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, {
+    'import/order': ['off', {
       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,
+    'import/newline-after-import': 'error',
 
     // 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,
+    'import/prefer-default-export': 'error',
 
     // 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,
+    'import/no-restricted-paths': 'off',
   },
 };

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

@@ -5,35 +5,44 @@ module.exports = {
 
   rules: {
     // enforce return after a callback
-    'callback-return': 0,
+    'callback-return': 'off',
 
     // require all requires be top-level
     // http://eslint.org/docs/rules/global-require
-    'global-require': 2,
+    'global-require': 'error',
 
     // enforces error handling in callbacks (node environment)
-    'handle-callback-err': 0,
+    'handle-callback-err': 'off',
 
     // disallow mixing regular variable and require declarations
-    'no-mixed-requires': [0, false],
+    'no-mixed-requires': ['off', false],
 
     // disallow use of new operator with the require function
-    'no-new-require': 2,
+    'no-new-require': 'error',
 
     // disallow string concatenation with __dirname and __filename
     // http://eslint.org/docs/rules/no-path-concat
-    'no-path-concat': 2,
+    'no-path-concat': 'error',
 
     // disallow use of process.env
-    'no-process-env': 0,
+    'no-process-env': 'off',
 
     // disallow process.exit()
-    'no-process-exit': 0,
+    'no-process-exit': 'off',
 
     // restrict usage of specified node modules
-    'no-restricted-modules': 0,
+    'no-restricted-modules': 'off',
+
+    // disallow certain object properties
+    // http://eslint.org/docs/rules/no-restricted-properties
+    // TODO: enable, semver-major
+    'no-restricted-properties': ['off', {
+      object: 'arguments',
+      property: 'callee',
+      message: 'arguments.callee is deprecated,'
+    }],
 
     // disallow use of synchronous methods (off by default)
-    'no-sync': 0,
+    'no-sync': 'off',
   }
 };

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

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

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

@@ -1,63 +1,69 @@
 module.exports = {
   rules: {
     // enforce spacing inside array brackets
-    'array-bracket-spacing': [2, 'never'],
+    'array-bracket-spacing': ['error', 'never'],
 
     // enforce spacing inside single-line blocks
     // http://eslint.org/docs/rules/block-spacing
-    'block-spacing': [2, 'always'],
+    'block-spacing': ['error', 'always'],
 
     // enforce one true brace style
-    'brace-style': [2, '1tbs', { allowSingleLine: true }],
+    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
 
     // require camel case names
-    camelcase: [2, { properties: 'never' }],
+    camelcase: ['error', { properties: 'never' }],
 
     // enforce spacing before and after comma
-    'comma-spacing': [2, { before: false, after: true }],
+    'comma-spacing': ['error', { before: false, after: true }],
 
     // enforce one true comma style
-    'comma-style': [2, 'last'],
+    'comma-style': ['error', 'last'],
 
     // disallow padding inside computed properties
-    'computed-property-spacing': [2, 'never'],
+    'computed-property-spacing': ['error', 'never'],
 
     // enforces consistent naming when capturing the current execution context
-    'consistent-this': 0,
+    'consistent-this': 'off',
 
     // enforce newline at the end of file, with no multiple empty lines
-    'eol-last': 2,
+    'eol-last': 'error',
+
+    // enforce spacing between functions and their invocations
+    // http://eslint.org/docs/rules/func-call-spacing
+    'func-call-spacing': ['error', 'never'],
 
     // require function expressions to have a name
-    'func-names': 1,
+    'func-names': 'warn',
 
     // enforces use of function declarations or expressions
-    'func-style': 0,
+    // http://eslint.org/docs/rules/func-style
+    // TODO: enable
+    'func-style': ['off', 'expression'],
 
     // Blacklist certain identifiers to prevent them being used
     // http://eslint.org/docs/rules/id-blacklist
-    'id-blacklist': 0,
+    'id-blacklist': 'off',
 
     // this option enforces minimum and maximum identifier lengths
     // (variable names, property names etc.)
-    'id-length': 0,
+    'id-length': 'off',
 
     // require identifiers to match the provided regular expression
-    'id-match': 0,
+    'id-match': 'off',
 
     // 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 }],
+    indent: ['error', 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'],
+    'jsx-quotes': ['off', 'prefer-double'],
 
     // enforces spacing between keys and values in object literal properties
-    'key-spacing': [2, { beforeColon: false, afterColon: true }],
+    'key-spacing': ['error', { beforeColon: false, afterColon: true }],
 
     // require a space before & after certain keywords
-    'keyword-spacing': [2, {
+    'keyword-spacing': ['error', {
       before: true,
       after: true,
       overrides: {
@@ -67,88 +73,107 @@ module.exports = {
       }
     }],
 
+    // enforce position of line comments
+    // http://eslint.org/docs/rules/line-comment-position
+    // TODO: enable?
+    'line-comment-position': ['off', {
+      position: 'above',
+      ignorePattern: '',
+      applyDefaultPatterns: true,
+    }],
+
     // disallow mixed 'LF' and 'CRLF' as linebreaks
     // http://eslint.org/docs/rules/linebreak-style
-    'linebreak-style': [2, 'unix'],
+    'linebreak-style': ['error', 'unix'],
 
     // enforces empty lines around comments
-    'lines-around-comment': 0,
+    'lines-around-comment': 'off',
+
+    // require or disallow newlines around directives
+    // http://eslint.org/docs/rules/lines-around-directive
+    // TODO: enable, semver-major
+    'lines-around-directive': ['off', {
+      before: 'always',
+      after: 'always',
+    }],
 
     // specify the maximum depth that blocks can be nested
-    'max-depth': [0, 4],
+    'max-depth': ['off', 4],
 
     // specify the maximum length of a line in your program
     // http://eslint.org/docs/rules/max-len
-    'max-len': [2, 100, 2, {
+    'max-len': ['error', 100, 2, {
       ignoreUrls: true,
-      ignoreComments: false
+      ignoreComments: false,
+      ignoreStrings: true,
+      ignoreTemplateLiterals: true,
     }],
 
     // specify the max number of lines in a file
     // http://eslint.org/docs/rules/max-lines
-    'max-lines': [0, {
+    'max-lines': ['off', {
       max: 300,
       skipBlankLines: true,
       skipComments: true
     }],
 
     // specify the maximum depth callbacks can be nested
-    'max-nested-callbacks': 0,
+    'max-nested-callbacks': 'off',
 
     // limits the number of parameters that can be used in the function declaration.
-    'max-params': [0, 3],
+    'max-params': ['off', 3],
 
     // specify the maximum number of statement allowed in a function
-    'max-statements': [0, 10],
+    'max-statements': ['off', 10],
 
     // restrict the number of statements per line
     // http://eslint.org/docs/rules/max-statements-per-line
-    'max-statements-per-line': [0, { max: 1 }],
+    'max-statements-per-line': ['off', { max: 1 }],
 
     // require multiline ternary
     // http://eslint.org/docs/rules/multiline-ternary
-    'multiline-ternary': 0,
+    // TODO: enable?
+    'multiline-ternary': ['off', 'never'],
 
     // require a capital letter for constructors
-    'new-cap': [2, { newIsCap: true }],
+    'new-cap': ['error', { newIsCap: true }],
 
     // disallow the omission of parentheses when invoking a constructor with no arguments
     // http://eslint.org/docs/rules/new-parens
-    'new-parens': 2,
+    'new-parens': 'error',
 
     // allow/disallow an empty newline after var statement
-    'newline-after-var': 0,
+    'newline-after-var': 'off',
 
     // http://eslint.org/docs/rules/newline-before-return
-    'newline-before-return': 0,
+    'newline-before-return': 'off',
 
     // 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 }],
+    'newline-per-chained-call': ['error', { ignoreChainWithDepth: 4 }],
 
     // disallow use of the Array constructor
-    'no-array-constructor': 2,
+    'no-array-constructor': 'error',
 
     // disallow use of bitwise operators
     // http://eslint.org/docs/rules/no-bitwise
-    // TODO: enable
-    'no-bitwise': 0,
+    'no-bitwise': 'error',
 
     // disallow use of the continue statement
     // http://eslint.org/docs/rules/no-continue
-    'no-continue': 2,
+    'no-continue': 'error',
 
     // disallow comments inline after code
-    'no-inline-comments': 0,
+    'no-inline-comments': 'off',
 
     // disallow if as the only statement in an else block
     // http://eslint.org/docs/rules/no-lonely-if
-    'no-lonely-if': 2,
+    'no-lonely-if': 'error',
 
     // disallow un-paren'd mixes of different operators
     // http://eslint.org/docs/rules/no-mixed-operators
-    'no-mixed-operators': [2, {
+    'no-mixed-operators': ['error', {
       groups: [
         ['+', '-', '*', '/', '%', '**'],
         ['&', '|', '^', '~', '<<', '>>', '>>>'],
@@ -160,129 +185,131 @@ module.exports = {
     }],
 
     // disallow mixed spaces and tabs for indentation
-    'no-mixed-spaces-and-tabs': 2,
+    'no-mixed-spaces-and-tabs': 'error',
 
     // disallow multiple empty lines and only one newline at the end
-    'no-multiple-empty-lines': [2, { max: 2, maxEOF: 1 }],
+    'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 1 }],
 
     // disallow negated conditions
     // http://eslint.org/docs/rules/no-negated-condition
-    'no-negated-condition': 0,
+    'no-negated-condition': 'off',
 
     // disallow nested ternary expressions
-    'no-nested-ternary': 2,
+    'no-nested-ternary': 'error',
 
     // disallow use of the Object constructor
-    'no-new-object': 2,
+    'no-new-object': 'error',
 
     // disallow use of unary operators, ++ and --
-    'no-plusplus': 0,
+    // http://eslint.org/docs/rules/no-plusplus
+    'no-plusplus': 'error',
 
     // disallow certain syntax forms
     // http://eslint.org/docs/rules/no-restricted-syntax
     'no-restricted-syntax': [
-      2,
-      'DebuggerStatement',
+      'error',
       'ForInStatement',
       'LabeledStatement',
       'WithStatement',
     ],
 
     // disallow space between function identifier and application
-    'no-spaced-func': 2,
+    'no-spaced-func': 'error',
 
     // disallow tab characters entirely
-    // TODO: enable
-    'no-tabs': 0,
+    'no-tabs': 'error',
 
     // disallow the use of ternary operators
-    'no-ternary': 0,
+    'no-ternary': 'off',
 
     // disallow trailing whitespace at the end of lines
-    'no-trailing-spaces': 2,
+    'no-trailing-spaces': 'error',
 
     // disallow dangling underscores in identifiers
-    'no-underscore-dangle': [2, { allowAfterThis: false }],
+    'no-underscore-dangle': ['error', { 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 }],
+    'no-unneeded-ternary': ['error', { defaultAssignment: false }],
 
     // disallow whitespace before properties
     // http://eslint.org/docs/rules/no-whitespace-before-property
-    'no-whitespace-before-property': 2,
+    'no-whitespace-before-property': 'error',
 
     // require padding inside curly braces
-    'object-curly-spacing': [2, 'always'],
+    'object-curly-spacing': ['error', '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, {
+    'object-curly-newline': ['off', {
       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, {
+    'object-property-newline': ['error', {
       allowMultiplePropertiesPerLine: true,
     }],
 
     // allow just one var statement per function
-    'one-var': [2, 'never'],
+    'one-var': ['error', 'never'],
 
     // require a newline around variable declaration
     // http://eslint.org/docs/rules/one-var-declaration-per-line
-    'one-var-declaration-per-line': [2, 'always'],
+    'one-var-declaration-per-line': ['error', 'always'],
 
     // require assignment operator shorthand where possible or prohibit it entirely
     // http://eslint.org/docs/rules/operator-assignment
-    'operator-assignment': [2, 'always'],
+    'operator-assignment': ['error', 'always'],
 
     // enforce operators to be placed before or after line breaks
-    'operator-linebreak': 0,
+    'operator-linebreak': 'off',
 
     // enforce padding within blocks
-    'padded-blocks': [2, 'never'],
+    'padded-blocks': ['error', '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 }],
+    'quote-props': ['error', 'as-needed', { keywords: false, unnecessary: true, numbers: false }],
 
     // specify whether double or single quotes should be used
-    quotes: [2, 'single', { avoidEscape: true }],
+    quotes: ['error', 'single', { avoidEscape: true }],
 
     // do not require jsdoc
     // http://eslint.org/docs/rules/require-jsdoc
-    'require-jsdoc': 0,
+    'require-jsdoc': 'off',
 
     // require or disallow use of semicolons instead of ASI
-    semi: [2, 'always'],
+    semi: ['error', 'always'],
 
     // enforce spacing before and after semicolons
-    'semi-spacing': [2, { before: false, after: true }],
+    'semi-spacing': ['error', { before: false, after: true }],
+
+    // requires object keys to be sorted
+    'sort-keys': ['off', 'asc', { caseSensitive: false, natural: true }],
 
     // sort variables within the same declaration block
-    'sort-vars': 0,
+    'sort-vars': 'off',
 
     // require or disallow space before blocks
-    'space-before-blocks': 2,
+    'space-before-blocks': 'error',
 
     // 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' }],
+    'space-before-function-paren': ['error', { anonymous: 'always', named: 'never' }],
 
     // require or disallow spaces inside parentheses
-    'space-in-parens': [2, 'never'],
+    'space-in-parens': ['error', 'never'],
 
     // require spaces around operators
-    'space-infix-ops': 2,
+    'space-infix-ops': 'error',
 
     // Require or disallow spaces before/after unary operators
     // http://eslint.org/docs/rules/space-unary-ops
-    'space-unary-ops': [2, {
+    'space-unary-ops': ['error', {
       words: true,
       nonwords: false,
       overrides: {
@@ -290,16 +317,16 @@ module.exports = {
     }],
 
     // require or disallow a space immediately following the // or /* in a comment
-    'spaced-comment': [2, 'always', {
+    'spaced-comment': ['error', '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'],
+    'unicode-bom': ['error', 'never'],
 
     // require regex literals to be wrapped in parentheses
-    'wrap-regex': 0
+    'wrap-regex': 'off'
   }
 };

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

@@ -1,41 +1,42 @@
 module.exports = {
   rules: {
     // enforce or disallow variable initializations at definition
-    'init-declarations': 0,
+    'init-declarations': 'off',
 
     // disallow the catch clause parameter name being the same as a variable in the outer scope
-    'no-catch-shadow': 0,
+    'no-catch-shadow': 'off',
 
     // disallow deletion of variables
-    'no-delete-var': 2,
+    'no-delete-var': 'error',
 
     // disallow labels that share a name with a variable
     // http://eslint.org/docs/rules/no-label-var
-    'no-label-var': 2,
+    'no-label-var': 'error',
 
     // disallow specific globals
-    'no-restricted-globals': 0,
+    'no-restricted-globals': 'off',
 
     // disallow declaration of variables already declared in the outer scope
-    'no-shadow': 2,
+    'no-shadow': 'error',
 
     // disallow shadowing of names such as arguments
-    'no-shadow-restricted-names': 2,
+    'no-shadow-restricted-names': 'error',
 
     // disallow use of undeclared variables unless mentioned in a /*global */ block
-    'no-undef': 2,
+    'no-undef': 'error',
 
     // disallow use of undefined when initializing variables
-    'no-undef-init': 2,
+    'no-undef-init': 'error',
 
     // disallow use of undefined variable
+    // http://eslint.org/docs/rules/no-undefined
     // TODO: enable?
-    'no-undefined': 0,
+    'no-undefined': 'off',
 
     // disallow declaration of variables that are not used in the code
-    'no-unused-vars': [2, { vars: 'local', args: 'after-used' }],
+    'no-unused-vars': ['error', { vars: 'local', args: 'after-used' }],
 
     // disallow use of variables before they are defined
-    'no-use-before-define': 2
+    'no-use-before-define': 'error'
   }
 };

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

@@ -6,14 +6,14 @@ import index from '../';
 
 const files = { index };
 
-fs.readdirSync(path.join(__dirname, '../rules')).forEach(name => {
+fs.readdirSync(path.join(__dirname, '../rules')).forEach((name) => {
   files[name] = require(`../rules/${name}`); // eslint-disable-line global-require
 });
 
-Object.keys(files).forEach(name => {
+Object.keys(files).forEach((name) => {
   const config = files[name];
 
-  test(`${name}: does not reference react`, t => {
+  test(`${name}: does not reference react`, (t) => {
     t.plan(2);
 
     // scan plugins for react and fail if it is found

packages/eslint-config-airbnb/CHANGELOG.md

@@ -1,3 +1,53 @@
+11.1.0 / 2016-09-11
+==================
+- [deps] update `eslint-config-airbnb-base`, `eslint`
+
+11.0.0 / 2016-09-08
+==================
+- [breaking] enable `react` rules: `react/no-danger-with-children`, `react/no-unused-prop-types`, `react/style-prop-object`, `react/forbid-prop-types`, `react/jsx-no-duplicate-props`; set `react/no-danger` to “warn”
+- [breaking] enable `jsx-a11y` rules: `jsx-a11y/anchor-has-content`, `jsx-a11y/tabindex-no-positive`, `jsx-a11y/no-static-element-interactions`
+- [deps] update `eslint`, `eslint-plugin-react`, `eslint-config-airbnb-base`, `eslint-find-rules`, `eslint-plugin-import`, `eslint-plugin-jsx-a11y`
+- [patch] set `ignoreCase` to `true` in disabled rules.
+- [docs] use “#” in example command rather than version numbers (#984)
+
+10.0.1 / 2016-08-12
+==================
+- [deps] update `eslint`, `eslint-find-rules`, `eslint-plugin-jsx-a11y`, `eslint-plugin-import`, `eslint-config-airbnb-base`
+
+10.0.0 / 2016-08-01
+==================
+- [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`
+- [breaking] enable aria rules:
+ - `jsx-a11y/aria-props`
+ - `jsx-a11y/aria-proptypes`
+ - `jsx-a11y/aria-unsupported-elements`
+ - `jsx-a11y/role-has-required-aria-props`
+ - `jsx-a11y/role-supports-aria-props`
+- [breaking] enable react rules:
+ - `react/jsx-filename-extension`
+ - `react/jsx-no-comment-textnodes`
+ - `react/jsx-no-target-blank`
+ - `react/require-extension`
+ - `react/no-render-return-value`
+ - `react/no-find-dom-node`
+ - `react/no-deprecated`
+- [deps] [breaking] update `eslint` to v3, `eslint-config-airbnb-base` to v5, `eslint-find-rules`, `eslint-plugin-import`, `eslint-plugin-jsx-a11y` to v2, `eslint-plugin-react` to v6, `tape`. drop node < 4 support.
+- [deps] update `eslint-config-airbnb-base`, `eslint-plugin-react`, `eslint-plugin-import`, `eslint-plugin-jsx-a11y`, `babel-tape-runner`, add `babel-preset-airbnb`. ensure react is `>=` 0.13.0
+- [patch] loosen `jsx-pascal-case` rule to allow all caps component names
+- [tests] stop testing < node 4
+- [tests] use `in-publish` because coffeescript screwed up the prepublish script for everyone
+- [tests] Only run `eslint-find-rules` on prepublish, not in tests
+- [tests] Even though the base config may not be up to date in the main package, let’s `npm link` the base package into the main one for the sake of travis-ci tests
+- [docs] update the peer dep install command to dynamically look up the right version numbers when installing peer deps
+- add `safe-publish-latest` to `prepublish`
+
 9.0.1 / 2016-05-08
 ==================
 - [patch] update `eslint-config-airbnb-base` to v3.0.1

packages/eslint-config-airbnb/README.md

@@ -23,10 +23,11 @@ Our default export contains all of our ESLint rules, including ECMAScript 6+ and
   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
+  npm install --save-dev eslint-config-airbnb eslint@^#.#.# eslint-plugin-jsx-a11y@^#.#.# eslint-plugin-import@^#.#.# eslint-plugin-react@^#.#.#
   ```
 
 2. Add `"extends": "airbnb"` to your .eslintrc
+
 ### eslint-config-airbnb/base
 
 This entry point is deprecated. See [eslint-config-airbnb-base](https://npmjs.com/eslint-config-airbnb-base).

packages/eslint-config-airbnb/package.json

@@ -1,12 +1,12 @@
 {
   "name": "eslint-config-airbnb",
-  "version": "9.0.1",
+  "version": "11.1.0",
   "description": "Airbnb's 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)",
+    "prepublish": "(in-install || eslint-find-rules --unused) && (not-in-publish || npm test) && safe-publish-latest",
     "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 &"
@@ -45,25 +45,26 @@
   },
   "homepage": "https://github.com/airbnb/javascript",
   "dependencies": {
-    "eslint-config-airbnb-base": "^5.0.1"
+    "eslint-config-airbnb-base": "^7.1.0"
   },
   "devDependencies": {
     "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",
+    "eslint": "^3.5.0",
+    "eslint-find-rules": "^1.13.1",
+    "eslint-plugin-import": "^1.14.0",
+    "eslint-plugin-jsx-a11y": "^2.2.1",
+    "eslint-plugin-react": "^6.2.0",
     "in-publish": "^2.0.0",
     "react": ">= 0.13.0",
+    "safe-publish-latest": "^1.0.1",
     "tape": "^4.6.0"
   },
   "peerDependencies": {
-    "eslint": "^3.2.2",
-    "eslint-plugin-jsx-a11y": "^2.0.1",
-    "eslint-plugin-import": "^1.12.0",
-    "eslint-plugin-react": "^6.0.0"
+    "eslint": "^3.5.0",
+    "eslint-plugin-jsx-a11y": "^2.2.1",
+    "eslint-plugin-import": "^1.14.0",
+    "eslint-plugin-react": "^6.2.0"
   },
   "engines": {
     "node": ">= 4"

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

@@ -7,94 +7,106 @@ module.exports = {
     jsx: true
   },
   rules: {
+    // Enforce that anchors have content
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/anchor-has-content.md
+    'jsx-a11y/anchor-has-content': ['error', ['']],
+
     // 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,
+    'jsx-a11y/aria-role': 'error',
 
     // 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,
+    'jsx-a11y/aria-props': 'error',
 
     // 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,
+    'jsx-a11y/aria-proptypes': 'error',
 
     // 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,
+    'jsx-a11y/aria-unsupported-elements': 'error',
 
     // 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']],
+    'jsx-a11y/href-no-hash': ['error', ['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,
+    'jsx-a11y/img-has-alt': 'error',
 
     // 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,
+    'jsx-a11y/img-redundant-alt': 'error',
 
     // 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']],
+    'jsx-a11y/label-has-for': ['error', ['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,
+    'jsx-a11y/mouse-events-have-key-events': 'off',
 
     // 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,
+    'jsx-a11y/no-access-key': 'error',
 
     // 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,
+    'jsx-a11y/no-onchange': 'off',
 
     // 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,
+    'jsx-a11y/onclick-has-focus': 'off',
 
     // 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,
+    'jsx-a11y/onclick-has-role': 'off',
 
     // 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,
+    'jsx-a11y/role-has-required-aria-props': 'error',
 
     // 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,
+    'jsx-a11y/role-supports-aria-props': 'error',
 
     // 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,
+    'jsx-a11y/tabindex-no-positive': 'error',
 
     // 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, ['']],
+    'jsx-a11y/heading-has-content': ['error', ['']],
 
     // 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,
+    'jsx-a11y/html-has-lang': 'error',
 
     // 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,
+    'jsx-a11y/lang': 'error',
 
     // prevent marquee elements
     // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-marquee.md
-    'jsx-a11y/no-marquee': 2,
+    'jsx-a11y/no-marquee': 'error',
 
     // 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,
+    'jsx-a11y/scope': 'error',
+
+    // require onClick be accompanied by onKeyUp/onKeyDown/onKeyPress
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/click-events-have-key-events.md
+    // TODO: enable?
+    'jsx-a11y/click-events-have-key-events': 'off',
+
+    // Enforce that DOM elements without semantic behavior not have interaction handlers
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/blob/master/docs/rules/no-static-element-interactions.md
+    'jsx-a11y/no-static-element-interactions': 'error',
   },
 };

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

@@ -16,50 +16,50 @@ module.exports = {
   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'],
+    'jsx-quotes': ['error', '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, { ignoreTranspilerName: false }],
+    'react/display-name': ['off', { 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': ['error', { 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'],
+    'react/jsx-boolean-value': ['error', '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'],
+    'react/jsx-closing-bracket-location': ['error', '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': [2, 'never', { allowMultiline: true }],
+    'react/jsx-curly-spacing': ['error', '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, {
+    'react/jsx-handler-names': ['off', {
       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],
+    'react/jsx-indent-props': ['error', 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,
+    'react/jsx-key': 'off',
 
     // 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 }],
+    'react/jsx-max-props-per-line': ['off', { 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': ['error', {
       ignoreRefs: true,
       allowArrowFunctions: true,
       allowBind: false,
@@ -67,38 +67,38 @@ module.exports = {
 
     // 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': ['error', { ignoreCase: true }],
 
     // 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,
+    'react/jsx-no-literals': 'off',
 
     // 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,
+    'react/jsx-no-undef': 'error',
 
     // 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': [2, {
+    'react/jsx-pascal-case': ['error', {
       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,
+    'react/sort-prop-types': ['off', {
+      ignoreCase: true,
       callbacksLast: false,
       requiredFirst: false,
     }],
 
     // Deprecated in favor of react/jsx-sort-props
-    'react/jsx-sort-prop-types': 0,
+    'react/jsx-sort-prop-types': 'off',
 
     // 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,
+    'react/jsx-sort-props': ['off', {
+      ignoreCase: true,
       callbacksLast: false,
       shorthandFirst: false,
       shorthandLast: false,
@@ -106,87 +106,87 @@ module.exports = {
 
     // 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],
+    'react/jsx-uses-react': ['error'],
 
     // 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,
+    'react/jsx-uses-vars': 'error',
 
     // Prevent usage of dangerous JSX properties
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-danger.md
-    'react/no-danger': 0,
+    'react/no-danger': 'warn',
 
     // Prevent usage of deprecated methods
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-deprecated.md
-    'react/no-deprecated': [2],
+    'react/no-deprecated': ['error'],
 
     // 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],
+    'react/no-did-mount-set-state': ['error'],
 
     // 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],
+    'react/no-did-update-set-state': ['error'],
 
     // 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,
+    'react/no-direct-mutation-state': 'off',
 
     // Prevent usage of isMounted
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-is-mounted.md
-    'react/no-is-mounted': 2,
+    'react/no-is-mounted': 'error',
 
     // 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: true }],
+    'react/no-multi-comp': ['error', { 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,
+    'react/no-set-state': 'off',
 
     // Prevent using string references
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-string-refs.md
-    'react/no-string-refs': 2,
+    'react/no-string-refs': 'error',
 
     // 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,
+    'react/no-unknown-property': 'error',
 
     // 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'],
+    'react/prefer-es6-class': ['error', '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,
+    'react/prefer-stateless-function': 'error',
 
     // 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': ['error', { 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,
+    'react/react-in-jsx-scope': 'error',
 
     // Restrict file extensions that may be required
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/require-extension.md
-    'react/require-extension': [2, { extensions: ['.jsx', '.js'] }],
+    'react/require-extension': ['error', { 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,
+    'react/require-render-return': 'error',
 
     // 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,
+    'react/self-closing-comp': 'error',
 
     // 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'],
+    'react/jsx-space-before-closing': ['error', 'always'],
 
     // Enforce component methods order
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md
-    'react/sort-comp': [2, {
+    'react/sort-comp': ['error', {
       order: [
         'static-methods',
         'lifecycle',
@@ -200,49 +200,69 @@ module.exports = {
 
     // Prevent missing parentheses around multilines JSX
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-wrap-multilines.md
-    'react/jsx-wrap-multilines': [2, {
+    'react/jsx-wrap-multilines': ['error', {
       declaration: true,
       assignment: true,
       return: true
     }],
-    'react/wrap-multilines': 0, // deprecated version
+    'react/wrap-multilines': 'off', // 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'],
+    'react/jsx-first-prop-new-line': ['error', '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'],
+    'react/jsx-equals-spacing': ['error', 'never'],
 
     // Enforce JSX indentation
     // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-indent.md
-    'react/jsx-indent': [2, 2],
+    'react/jsx-indent': ['error', 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,
+    'react/jsx-no-target-blank': 'error',
 
     // 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'] }],
+    'react/jsx-filename-extension': ['error', { 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
+    'react/jsx-no-comment-textnodes': 'error',
+    'react/no-comment-textnodes': 'off', // 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,
+    'react/no-render-return-value': 'error',
 
     // 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: [] }],
+    'react/require-optimization': ['off', { 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,
+    'react/no-find-dom-node': 'error',
+
+    // Forbid certain props on Components
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/forbid-component-props.md
+    'react/forbid-component-props': ['off', { forbid: [] }],
+
+    // Prevent problem with children and props.dangerouslySetInnerHTML
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-danger-with-children.md
+    'react/no-danger-with-children': 'error',
+
+    // Prevent unused propType definitions
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/no-unused-prop-types.md
+    'react/no-unused-prop-types': ['error', {
+      customValidators: [
+      ],
+      skipShapeProps: false,
+    }],
+
+    // Require style prop value be an object or var
+    // https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/style-prop-object.md
+    'react/style-prop-object': 'error',
   },
 
   settings: {

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

@@ -6,7 +6,7 @@ const base = require('../base');
 
 const files = { base };
 
-fs.readdirSync(path.join(__dirname, '../rules')).forEach(name => {
+fs.readdirSync(path.join(__dirname, '../rules')).forEach((name) => {
   if (name === 'react.js' || name === 'react-a11y.js') {
     return;
   }
@@ -14,10 +14,10 @@ fs.readdirSync(path.join(__dirname, '../rules')).forEach(name => {
   files[name] = require(`../rules/${name}`); // eslint-disable-line global-require
 });
 
-Object.keys(files).forEach(name => {
+Object.keys(files).forEach((name) => {
   const config = files[name];
 
-  test(`${name}: does not reference react`, t => {
+  test(`${name}: does not reference react`, (t) => {
     t.plan(2);
 
     // scan plugins for react and fail if it is found

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

@@ -26,7 +26,7 @@ function wrapComponent(body) {
 import React from 'react';
 
 export default class MyComponent extends React.Component {
-/* eslint no-empty-function: 0 */
+/* eslint no-empty-function: 0, class-methods-use-this: 0 */
 ${body}
 }
 `;
@@ -57,7 +57,7 @@ test('validate react prop order', (t) => {
     t.deepEquals(result.messages, [], 'no messages in results');
   });
 
-  t.test('order: when random method is first', t => {
+  t.test('order: when random method is first', (t) => {
     t.plan(2);
     const result = lint(wrapComponent(`
   someMethod() {}
@@ -74,7 +74,7 @@ test('validate react prop order', (t) => {
     t.equal(result.messages[0].ruleId, 'react/sort-comp', 'fails due to sort');
   });
 
-  t.test('order: when random method after lifecycle methods', t => {
+  t.test('order: when random method after lifecycle methods', (t) => {
     t.plan(2);
     const result = lint(wrapComponent(`
   componentWillMount() {}

react/README.md

@@ -337,7 +337,7 @@
 
     // good
     <Foo
-      ref={(ref) => this.myRef = ref}
+      ref={ref => { this.myRef = ref; }}
     />
     ```
 
@@ -450,6 +450,7 @@
     ```
 
   - Do not use underscore prefix for internal methods of a React component.
+  > Why? Underscore prefixes are sometimes used as a convention in other languages to denote privacy. But, unlike those languages, there is no native support for privacy in JavaScript, everything is public. Regardless of your intentions, adding underscore prefixes to your properties does not actually make them private, and any property (underscore-prefixed or not) should be treated as being public. See issues #1024, and #490 for a more in-depth discussion.
 
     ```jsx
     // bad
@@ -471,7 +472,7 @@
     }
     ```
 
-  - Be sure to return a value in your `render` methods. eslint: [`require-render-return`](https://github.com/yannickcr/eslint-plugin-react/pull/502)
+  - Be sure to return a value in your `render` methods. eslint: [`react/require-render-return`](https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/require-render-return.md)
 
     ```jsx
     // bad
@@ -575,5 +576,6 @@
   - ![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)
+  - ![jp](https://raw.githubusercontent.com/gosquared/flags/master/flags/flags/shiny/24/Japan.png) **Japanese**: [mitsuruog/javascript-style-guide](https://github.com/mitsuruog/javascript-style-guide)
 
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