source: trip-planner-front/node_modules/copy-descriptor/index.js@ e29cc2e

Last change on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/*!
2 * copy-descriptor <https://github.com/jonschlinkert/copy-descriptor>
3 *
4 * Copyright (c) 2015, Jon Schlinkert.
5 * Licensed under the MIT License.
6 */
7
8'use strict';
9
10/**
11 * Copy a descriptor from one object to another.
12 *
13 * ```js
14 * function App() {
15 * this.cache = {};
16 * }
17 * App.prototype.set = function(key, val) {
18 * this.cache[key] = val;
19 * return this;
20 * };
21 * Object.defineProperty(App.prototype, 'count', {
22 * get: function() {
23 * return Object.keys(this.cache).length;
24 * }
25 * });
26 *
27 * copy(App.prototype, 'count', 'len');
28 *
29 * // create an instance
30 * var app = new App();
31 *
32 * app.set('a', true);
33 * app.set('b', true);
34 * app.set('c', true);
35 *
36 * console.log(app.count);
37 * //=> 3
38 * console.log(app.len);
39 * //=> 3
40 * ```
41 * @name copy
42 * @param {Object} `receiver` The target object
43 * @param {Object} `provider` The provider object
44 * @param {String} `from` The key to copy on provider.
45 * @param {String} `to` Optionally specify a new key name to use.
46 * @return {Object}
47 * @api public
48 */
49
50module.exports = function copyDescriptor(receiver, provider, from, to) {
51 if (!isObject(provider) && typeof provider !== 'function') {
52 to = from;
53 from = provider;
54 provider = receiver;
55 }
56 if (!isObject(receiver) && typeof receiver !== 'function') {
57 throw new TypeError('expected the first argument to be an object');
58 }
59 if (!isObject(provider) && typeof provider !== 'function') {
60 throw new TypeError('expected provider to be an object');
61 }
62
63 if (typeof to !== 'string') {
64 to = from;
65 }
66 if (typeof from !== 'string') {
67 throw new TypeError('expected key to be a string');
68 }
69
70 if (!(from in provider)) {
71 throw new Error('property "' + from + '" does not exist');
72 }
73
74 var val = Object.getOwnPropertyDescriptor(provider, from);
75 if (val) Object.defineProperty(receiver, to, val);
76};
77
78function isObject(val) {
79 return {}.toString.call(val) === '[object Object]';
80}
81
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