1 | 'use strict';
|
2 |
|
3 | var hasOwn = Object.prototype.hasOwnProperty;
|
4 | var toStr = Object.prototype.toString;
|
5 | var defineProperty = Object.defineProperty;
|
6 | var gOPD = Object.getOwnPropertyDescriptor;
|
7 |
|
8 | var isArray = function isArray(arr) {
|
9 | if (typeof Array.isArray === 'function') {
|
10 | return Array.isArray(arr);
|
11 | }
|
12 |
|
13 | return toStr.call(arr) === '[object Array]';
|
14 | };
|
15 |
|
16 | var isPlainObject = function isPlainObject(obj) {
|
17 | if (!obj || toStr.call(obj) !== '[object Object]') {
|
18 | return false;
|
19 | }
|
20 |
|
21 | var hasOwnConstructor = hasOwn.call(obj, 'constructor');
|
22 | var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
|
23 |
|
24 | if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
|
25 | return false;
|
26 | }
|
27 |
|
28 |
|
29 |
|
30 | var key;
|
31 | for (key in obj) { }
|
32 |
|
33 | return typeof key === 'undefined' || hasOwn.call(obj, key);
|
34 | };
|
35 |
|
36 |
|
37 | var setProperty = function setProperty(target, options) {
|
38 | if (defineProperty && options.name === '__proto__') {
|
39 | defineProperty(target, options.name, {
|
40 | enumerable: true,
|
41 | configurable: true,
|
42 | value: options.newValue,
|
43 | writable: true
|
44 | });
|
45 | } else {
|
46 | target[options.name] = options.newValue;
|
47 | }
|
48 | };
|
49 |
|
50 |
|
51 | var getProperty = function getProperty(obj, name) {
|
52 | if (name === '__proto__') {
|
53 | if (!hasOwn.call(obj, name)) {
|
54 | return void 0;
|
55 | } else if (gOPD) {
|
56 |
|
57 |
|
58 | return gOPD(obj, name).value;
|
59 | }
|
60 | }
|
61 |
|
62 | return obj[name];
|
63 | };
|
64 |
|
65 | module.exports = function extend() {
|
66 | var options, name, src, copy, copyIsArray, clone;
|
67 | var target = arguments[0];
|
68 | var i = 1;
|
69 | var length = arguments.length;
|
70 | var deep = false;
|
71 |
|
72 |
|
73 | if (typeof target === 'boolean') {
|
74 | deep = target;
|
75 | target = arguments[1] || {};
|
76 |
|
77 | i = 2;
|
78 | }
|
79 | if (target == null || (typeof target !== 'object' && typeof target !== 'function')) {
|
80 | target = {};
|
81 | }
|
82 |
|
83 | for (; i < length; ++i) {
|
84 | options = arguments[i];
|
85 |
|
86 | if (options != null) {
|
87 |
|
88 | for (name in options) {
|
89 | src = getProperty(target, name);
|
90 | copy = getProperty(options, name);
|
91 |
|
92 |
|
93 | if (target !== copy) {
|
94 |
|
95 | if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
|
96 | if (copyIsArray) {
|
97 | copyIsArray = false;
|
98 | clone = src && isArray(src) ? src : [];
|
99 | } else {
|
100 | clone = src && isPlainObject(src) ? src : {};
|
101 | }
|
102 |
|
103 |
|
104 | setProperty(target, { name: name, newValue: extend(deep, clone, copy) });
|
105 |
|
106 |
|
107 | } else if (typeof copy !== 'undefined') {
|
108 | setProperty(target, { name: name, newValue: copy });
|
109 | }
|
110 | }
|
111 | }
|
112 | }
|
113 | }
|
114 |
|
115 |
|
116 | return target;
|
117 | };
|