source: trip-planner-front/node_modules/static-extend/index.js@ 8d391a1

Last change on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1/*!
2 * static-extend <https://github.com/jonschlinkert/static-extend>
3 *
4 * Copyright (c) 2016, Jon Schlinkert.
5 * Licensed under the MIT License.
6 */
7
8'use strict';
9
10var copy = require('object-copy');
11var define = require('define-property');
12var util = require('util');
13
14/**
15 * Returns a function for extending the static properties,
16 * prototype properties, and descriptors from the `Parent`
17 * constructor onto `Child` constructors.
18 *
19 * ```js
20 * var extend = require('static-extend');
21 * Parent.extend = extend(Parent);
22 *
23 * // optionally pass a custom merge function as the second arg
24 * Parent.extend = extend(Parent, function(Child) {
25 * Child.prototype.mixin = function(key, val) {
26 * Child.prototype[key] = val;
27 * };
28 * });
29 *
30 * // extend "child" constructors
31 * Parent.extend(Child);
32 *
33 * // optionally define prototype methods as the second arg
34 * Parent.extend(Child, {
35 * foo: function() {},
36 * bar: function() {}
37 * });
38 * ```
39 * @param {Function} `Parent` Parent ctor
40 * @param {Function} `extendFn` Optional extend function for handling any necessary custom merging. Useful when updating methods that require a specific prototype.
41 * @param {Function} `Child` Child ctor
42 * @param {Object} `proto` Optionally pass additional prototype properties to inherit.
43 * @return {Object}
44 * @api public
45 */
46
47function extend(Parent, extendFn) {
48 if (typeof Parent !== 'function') {
49 throw new TypeError('expected Parent to be a function.');
50 }
51
52 return function(Ctor, proto) {
53 if (typeof Ctor !== 'function') {
54 throw new TypeError('expected Ctor to be a function.');
55 }
56
57 util.inherits(Ctor, Parent);
58 copy(Ctor, Parent);
59
60 // proto can be null or a plain object
61 if (typeof proto === 'object') {
62 var obj = Object.create(proto);
63
64 for (var k in obj) {
65 Ctor.prototype[k] = obj[k];
66 }
67 }
68
69 // keep a reference to the parent prototype
70 define(Ctor.prototype, '_parent_', {
71 configurable: true,
72 set: function() {},
73 get: function() {
74 return Parent.prototype;
75 }
76 });
77
78 if (typeof extendFn === 'function') {
79 extendFn(Ctor, Parent);
80 }
81
82 Ctor.extend = extend(Ctor, extendFn);
83 };
84};
85
86/**
87 * Expose `extend`
88 */
89
90module.exports = extend;
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