twitst4tz

index.js (3321B)

---

 '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;
 };