fix

constants/MediaTypes.js

@@ -0,0 +1,11 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+export default {
+  Audio: "Audio",
+  Video: "Video",
+  Photo: "Photo",
+  Book: "Book",
+};