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'use strict';
// 19.1.2.1 Object.assign(target, source, ...)
var getKeys = require('./_object-keys')
, gOPS = require('./_object-gops')
, pIE = require('./_object-pie')
, toObject = require('./_to-object')
, IObject = require('./_iobject')
, $assign = Object.assign;
// should work with symbols and should have deterministic property order (V8 bug)
module.exports = !$assign || require('./_fails')(function(){
var A = {}
, B = {}
, S = Symbol()
, K = 'abcdefghijklmnopqrst';
A[S] = 7;
K.split('').forEach(function(k){ B[k] = k; });
return $assign({}, A)[S] != 7 || Object.keys($assign({}, B)).join('') != K;
}) ? function assign(target, source){ // eslint-disable-line no-unused-vars
var T = toObject(target)
, aLen = arguments.length
, index = 1
, getSymbols = gOPS.f
, isEnum = pIE.f;
while(aLen > index){
var S = IObject(arguments[index++])
, keys = getSymbols ? getKeys(S).concat(getSymbols(S)) : getKeys(S)
, length = keys.length
, j = 0
, key;
while(length > j)if(isEnum.call(S, key = keys[j++]))T[key] = S[key];
} return T;
} : $assign;
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