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✏️ deep-extend.js

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/*!
 * @description Recursive object extending
 * @author Viacheslav Lotsmanov <lotsmanov89@gmail.com>
 * @license MIT
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2018 Viacheslav Lotsmanov
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

'use strict';

function isSpecificValue(val) {
	return (
		val instanceof Buffer
		|| val instanceof Date
		|| val instanceof RegExp
	) ? true : false;
}

/**
 * Recursive cloning array.
 */
function deepCloneArray(arr) {
	var clone = [];
	arr.forEach(function (item, index) {
		if (typeof item === 'object' && item !== null) {
			if (Array.isArray(item)) {
				clone[index] = deepCloneArray(item);
			} else if (isSpecificValue(item)) {
				clone[index] = cloneSpecificValue(item);
			} else {
				clone[index] = deepExtend({}, item);
			}
		} else {
			clone[index] = item;
		}
	});
	return clone;
}

function safeGetProperty(object, property) {
	return property === '__proto__' ? undefined : object[property];
}

/**
 * Extening object that entered in first argument.
 *
 * Returns extended object or false if have no target object or incorrect type.
 *
 * If you wish to clone source object (without modify it), just use empty new
 * object as first argument, like this:
 *   deepExtend({}, yourObj_1, [yourObj_N]);
 */
var deepExtend = module.exports = function (/*obj_1, [obj_2], [obj_N]*/) {
	if (arguments.length < 1 || typeof arguments[0] !== 'object') {
		return false;
	}

if (arguments.length < 2) {
		return arguments[0];
	}

var target = arguments[0];

// convert arguments to array and cut off target object
	var args = Array.prototype.slice.call(arguments, 1);

var val, src, clone;

args.forEach(function (obj) {
		// skip argument if isn't an object, is null, or is an array
		if (typeof obj !== 'object' || obj === null || Array.isArray(obj)) {
			return;
		}

Object.keys(obj).forEach(function (key) {
			src = safeGetProperty(target, key); // source value
			val = safeGetProperty(obj, key); // new value

// recursion prevention
			if (val === target) {
				return;

/**
			 * if new value isn't object then just overwrite by new value
			 * instead of extending.
			 */
			} else if (typeof val !== 'object' || val === null) {
				target[key] = val;
				return;

// just clone arrays (and recursive clone objects inside)
			} else if (Array.isArray(val)) {
				target[key] = deepCloneArray(val);
				return;

// custom cloning and overwrite for specific objects
			} else if (isSpecificValue(val)) {
				target[key] = cloneSpecificValue(val);
				return;

// overwrite by new value if source isn't object or array
			} else if (typeof src !== 'object' || src === null || Array.isArray(src)) {
				target[key] = deepExtend({}, val);
				return;

// source value and new value is objects both, extending...
			} else {
				target[key] = deepExtend(src, val);
				return;
			}
		});
	});

return target;
};

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✏️ deep-extend.js