RN: Cleanup OSS JS & Flow Declarations

Reviewed By: vjeux

Differential Revision: D4210763

fbshipit-source-id: 5abaa547100b8badd13bcf311ceffc5b4098d252

Examples/UIExplorer/UIExplorerUnitTests/TestBundle.js

@@ -6,8 +6,9 @@
  * 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.
  */
+'use strict';
 
-var __fbBatchedBridge = {
+const __fbBatchedBridge = { // eslint-disable-line no-unused-vars
   flushedQueue: function() {
     return null;
   }