Configring node js.

node_modules/core-js/modules/_object-gopn-ext.js

@@ -0,0 +1,19 @@
+// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window
+var toIObject = require('./_to-iobject')
+  , gOPN      = require('./_object-gopn').f
+  , toString  = {}.toString;
+
+var windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames
+  ? Object.getOwnPropertyNames(window) : [];
+
+var getWindowNames = function(it){
+  try {
+    return gOPN(it);
+  } catch(e){
+    return windowNames.slice();
+  }
+};
+
+module.exports.f = function getOwnPropertyNames(it){
+  return windowNames && toString.call(it) == '[object Window]' ? getWindowNames(it) : gOPN(toIObject(it));
+};