'use strict';
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var isExtendable = require('is-extendable');
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var forIn = require('for-in');
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function mixinDeep(target, objects) {
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var len = arguments.length, i = 0;
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while (++i < len) {
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var obj = arguments[i];
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if (isObject(obj)) {
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forIn(obj, copy, target);
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}
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}
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return target;
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}
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/**
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* Copy properties from the source object to the
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* target object.
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*
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* @param {*} `val`
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* @param {String} `key`
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*/
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function copy(val, key) {
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if (!isValidKey(key)) {
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return;
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}
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var obj = this[key];
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if (isObject(val) && isObject(obj)) {
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mixinDeep(obj, val);
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} else {
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this[key] = val;
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}
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}
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/**
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* Returns true if `val` is an object or function.
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*
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* @param {any} val
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* @return {Boolean}
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*/
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function isObject(val) {
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return isExtendable(val) && !Array.isArray(val);
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}
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/**
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* Returns true if `key` is a valid key to use when extending objects.
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*
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* @param {String} `key`
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* @return {Boolean}
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*/
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function isValidKey(key) {
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return key !== '__proto__' && key !== 'constructor' && key !== 'prototype';
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};
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/**
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* Expose `mixinDeep`
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*/
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module.exports = mixinDeep;
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