Configring node js.

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

@@ -0,0 +1,15 @@
+var metadata                  = require('./_metadata')
+  , anObject                  = require('./_an-object')
+  , aFunction                 = require('./_a-function')
+  , toMetaKey                 = metadata.key
+  , ordinaryDefineOwnMetadata = metadata.set;
+
+metadata.exp({metadata: function metadata(metadataKey, metadataValue){
+  return function decorator(target, targetKey){
+    ordinaryDefineOwnMetadata(
+      metadataKey, metadataValue,
+      (targetKey !== undefined ? anObject : aFunction)(target),
+      toMetaKey(targetKey)
+    );
+  };
+}});