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| /** | |
| * Disallows arrow functions. | |
| * | |
| * Why enable this rule? Arrow functions might cause more problems than they | |
| * solve: | |
| * | |
| * - Object-orientation may be better without ECMAScript's `this`. | |
| * - You can't name an arrow function. | |
| * - Arrow functions' syntax can cause maintenance issues; see | |
| * `disallowShorthandArrowFunctions`. | |
| * - Arrow functions shouldn't be used on prototypes, as objects' methods, | |
| * as event listeners, or as anything polymorhpic- or mixin-related. See | |
| * [here](https://gist.github.com/qubyte/43e0093274e793cc82ba#gistcomment-1292183). | |
| * | |
| * Type: `Boolean` | |
| * | |
| * Value: `true` | |
| * | |
| * Version: `ES6` | |
| * | |
| * #### Example | |
| * | |
| * ```js | |
| * "disallowArrowFunctions": true | |
| * ``` | |
| * | |
| * ##### Valid | |
| * | |
| * ```js | |
| * // function expression in a callback | |
| * [1, 2, 3].map(function (x) { | |
| * return x * x; | |
| * }); | |
| * ``` | |
| * | |
| * ##### Invalid | |
| * | |
| * ```js | |
| * // arrow function | |
| * [1, 2, 3].map((x) => { | |
| * return x * x; | |
| * }); | |
| * ``` | |
| */ | |
| var assert = require('assert'); | |
| module.exports = function() {}; | |
| module.exports.prototype = { | |
| configure: function(options) { | |
| assert( | |
| options === true, | |
| this.getOptionName() + ' option requires a true value or should be removed' | |
| ); | |
| }, | |
| getOptionName: function() { | |
| return 'disallowArrowFunctions'; | |
| }, | |
| check: function(file, errors) { | |
| file.iterateNodesByType(['ArrowFunctionExpression'], function(node) { | |
| errors.add('Do not use arrow functions', node.loc.start); | |
| }); | |
| } | |
| }; |