--- /dev/null
+'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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