Configring node js.

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

@@ -0,0 +1,19 @@
+var Set                     = require('./es6.set')
+  , from                    = require('./_array-from-iterable')
+  , metadata                = require('./_metadata')
+  , anObject                = require('./_an-object')
+  , getPrototypeOf          = require('./_object-gpo')
+  , ordinaryOwnMetadataKeys = metadata.keys
+  , toMetaKey               = metadata.key;
+
+var ordinaryMetadataKeys = function(O, P){
+  var oKeys  = ordinaryOwnMetadataKeys(O, P)
+    , parent = getPrototypeOf(O);
+  if(parent === null)return oKeys;
+  var pKeys  = ordinaryMetadataKeys(parent, P);
+  return pKeys.length ? oKeys.length ? from(new Set(oKeys.concat(pKeys))) : pKeys : oKeys;
+};
+
+metadata.exp({getMetadataKeys: function getMetadataKeys(target /*, targetKey */){
+  return ordinaryMetadataKeys(anObject(target), arguments.length < 2 ? undefined : toMetaKey(arguments[1]));
+}});