| /*! |
| * is-accessor-descriptor <https://github.com/jonschlinkert/is-accessor-descriptor> |
| * |
| * Copyright (c) 2015, Jon Schlinkert. |
| * Licensed under the MIT License. |
| */ |
| |
| 'use strict'; |
| |
| var typeOf = require('kind-of'); |
| |
| // accessor descriptor properties |
| var accessor = { |
| get: 'function', |
| set: 'function', |
| configurable: 'boolean', |
| enumerable: 'boolean' |
| }; |
| |
| function isAccessorDescriptor(obj, prop) { |
| if (typeof prop === 'string') { |
| var val = Object.getOwnPropertyDescriptor(obj, prop); |
| return typeof val !== 'undefined'; |
| } |
| |
| if (typeOf(obj) !== 'object') { |
| return false; |
| } |
| |
| if (has(obj, 'value') || has(obj, 'writable')) { |
| return false; |
| } |
| |
| if (!has(obj, 'get') || typeof obj.get !== 'function') { |
| return false; |
| } |
| |
| // tldr: it's valid to have "set" be undefined |
| // "set" might be undefined if `Object.getOwnPropertyDescriptor` |
| // was used to get the value, and only `get` was defined by the user |
| if (has(obj, 'set') && typeof obj[key] !== 'function' && typeof obj[key] !== 'undefined') { |
| return false; |
| } |
| |
| for (var key in obj) { |
| if (!accessor.hasOwnProperty(key)) { |
| continue; |
| } |
| |
| if (typeOf(obj[key]) === accessor[key]) { |
| continue; |
| } |
| |
| if (typeof obj[key] !== 'undefined') { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| function has(obj, key) { |
| return {}.hasOwnProperty.call(obj, key); |
| } |
| |
| /** |
| * Expose `isAccessorDescriptor` |
| */ |
| |
| module.exports = isAccessorDescriptor; |