Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/$.wks.js

@@ -0,0 +1,7 @@
+var store  = require('./$.shared')('wks')
+  , uid    = require('./$.uid')
+  , Symbol = require('./$.global').Symbol;
+module.exports = function(name){
+  return store[name] || (store[name] =
+    Symbol && Symbol[name] || (Symbol || uid)('Symbol.' + name));
+};