Configring node js.

node_modules/core-js/modules/_wks.js

@@ -0,0 +1,11 @@
+var store      = require('./_shared')('wks')
+  , uid        = require('./_uid')
+  , Symbol     = require('./_global').Symbol
+  , USE_SYMBOL = typeof Symbol == 'function';
+
+var $exports = module.exports = function(name){
+  return store[name] || (store[name] =
+    USE_SYMBOL && Symbol[name] || (USE_SYMBOL ? Symbol : uid)('Symbol.' + name));
+};
+
+$exports.store = store;