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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; };