diff --git a/Libraries/Utilities/DebugEnvironment.js b/Libraries/Utilities/DebugEnvironment.js
new file mode 100644
index 00000000000..375d0f4d485
--- /dev/null
+++ b/Libraries/Utilities/DebugEnvironment.js
@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule DebugEnvironment
+ * @flow
+ */
+
+'use strict';
+
+module.exports = {
+  // When crippled, synchronous JS function calls to native will fail.
+  isCrippledMode: __DEV__ && !global.nativeCallSyncHook,
+};
diff --git a/Libraries/Core/ErrorUtils.js b/Libraries/vendor/core/ErrorUtils.js
similarity index 100%
rename from Libraries/Core/ErrorUtils.js
rename to Libraries/vendor/core/ErrorUtils.js