Configring node js.

node_modules/core-js/modules/_own-keys.js

@@ -0,0 +1,10 @@
+// all object keys, includes non-enumerable and symbols
+var gOPN     = require('./_object-gopn')
+  , gOPS     = require('./_object-gops')
+  , anObject = require('./_an-object')
+  , Reflect  = require('./_global').Reflect;
+module.exports = Reflect && Reflect.ownKeys || function ownKeys(it){
+  var keys       = gOPN.f(anObject(it))
+    , getSymbols = gOPS.f;
+  return getSymbols ? keys.concat(getSymbols(it)) : keys;
+};