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