diff --git a/packages/metro-bundler/src/Resolver/polyfills/babelHelpers.js b/packages/metro-bundler/src/Resolver/polyfills/babelHelpers.js
index 1390ef6d..51cb4523 100644
--- a/packages/metro-bundler/src/Resolver/polyfills/babelHelpers.js
+++ b/packages/metro-bundler/src/Resolver/polyfills/babelHelpers.js
@@ -63,6 +63,16 @@ babelHelpers.createClass = (function () {
   };
 })();
 
+babelHelpers.defineEnumerableProperties = function(obj, descs) {
+  for (var key in descs) {
+    var desc = descs[key];
+    desc.configurable = (desc.enumerable = true);
+    if ('value' in desc) desc.writable = true;
+    Object.defineProperty(obj, key, desc);
+  }
+  return obj;
+};
+
 babelHelpers.defineProperty = function (obj, key, value) {
   if (key in obj) {
     Object.defineProperty(obj, key, {