Configring node js.

node_modules/core-js/library/modules/es7.reflect.get-own-metadata-keys.js

@@ -0,0 +1,8 @@
+var metadata                = require('./_metadata')
+  , anObject                = require('./_an-object')
+  , ordinaryOwnMetadataKeys = metadata.keys
+  , toMetaKey               = metadata.key;
+
+metadata.exp({getOwnMetadataKeys: function getOwnMetadataKeys(target /*, targetKey */){
+  return ordinaryOwnMetadataKeys(anObject(target), arguments.length < 2 ? undefined : toMetaKey(arguments[1]));
+}});