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