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- 'use strict';
- var hasOwn = Object.prototype.hasOwnProperty;
- var toStr = Object.prototype.toString;
- var defineProperty = Object.defineProperty;
- var gOPD = Object.getOwnPropertyDescriptor;
- var isArray = function isArray(arr) {
- if (typeof Array.isArray === 'function') {
- return Array.isArray(arr);
- }
- return toStr.call(arr) === '[object Array]';
- };
- var isPlainObject = function isPlainObject(obj) {
- if (!obj || toStr.call(obj) !== '[object Object]') {
- return false;
- }
- var hasOwnConstructor = hasOwn.call(obj, 'constructor');
- var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
- // Not own constructor property must be Object
- if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
- return false;
- }
- // Own properties are enumerated firstly, so to speed up,
- // if last one is own, then all properties are own.
- var key;
- for (key in obj) { /**/ }
- return typeof key === 'undefined' || hasOwn.call(obj, key);
- };
- // If name is '__proto__', and Object.defineProperty is available, define __proto__ as an own property on target
- var setProperty = function setProperty(target, options) {
- if (defineProperty && options.name === '__proto__') {
- defineProperty(target, options.name, {
- enumerable: true,
- configurable: true,
- value: options.newValue,
- writable: true
- });
- } else {
- target[options.name] = options.newValue;
- }
- };
- // Return undefined instead of __proto__ if '__proto__' is not an own property
- var getProperty = function getProperty(obj, name) {
- if (name === '__proto__') {
- if (!hasOwn.call(obj, name)) {
- return void 0;
- } else if (gOPD) {
- // In early versions of node, obj['__proto__'] is buggy when obj has
- // __proto__ as an own property. Object.getOwnPropertyDescriptor() works.
- return gOPD(obj, name).value;
- }
- }
- return obj[name];
- };
- module.exports = function extend() {
- var options, name, src, copy, copyIsArray, clone;
- var target = arguments[0];
- var i = 1;
- var length = arguments.length;
- var deep = false;
- // Handle a deep copy situation
- if (typeof target === 'boolean') {
- deep = target;
- target = arguments[1] || {};
- // skip the boolean and the target
- i = 2;
- }
- if (target == null || (typeof target !== 'object' && typeof target !== 'function')) {
- target = {};
- }
- for (; i < length; ++i) {
- options = arguments[i];
- // Only deal with non-null/undefined values
- if (options != null) {
- // Extend the base object
- for (name in options) {
- src = getProperty(target, name);
- copy = getProperty(options, name);
- // Prevent never-ending loop
- if (target !== copy) {
- // Recurse if we're merging plain objects or arrays
- if (deep && copy && (isPlainObject(copy) || (copyIsArray = isArray(copy)))) {
- if (copyIsArray) {
- copyIsArray = false;
- clone = src && isArray(src) ? src : [];
- } else {
- clone = src && isPlainObject(src) ? src : {};
- }
- // Never move original objects, clone them
- setProperty(target, { name: name, newValue: extend(deep, clone, copy) });
- // Don't bring in undefined values
- } else if (typeof copy !== 'undefined') {
- setProperty(target, { name: name, newValue: copy });
- }
- }
- }
- }
- }
- // Return the modified object
- return target;
- };
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