add babel

index.js/contants.js → contants.js

   UPLOAD_FAILED_CODE: 400
 };
 
-exports.Constants = Constants;
+exports.Constants = Constants;

index.js/index.js → index.js

     });
     return this;
   }
-};
+};

index.js/utils.js → utils.js

 
         loadNext();
     });
-}
+}