EventEmitter: Default Export {Native,RCTDevice}EventEmitter

Summary:
Refactors `NativeEventEmitter` and `RCTDeviceEventEmitter` to be default exports.

Changelog:
[Internal]

Reviewed By: RSNara

Differential Revision: D22203918

fbshipit-source-id: 575b2baf1604d1a8a1bffd6d108c12f3f8415e0a

Libraries/Core/setUpBatchedBridge.js

@@ -26,8 +26,9 @@ registerModule('SamplingProfiler', () =>
   require('../Performance/SamplingProfiler'),
 );
 registerModule('RCTLog', () => require('../Utilities/RCTLog'));
-registerModule('RCTDeviceEventEmitter', () =>
-  require('../EventEmitter/RCTDeviceEventEmitter'),
+registerModule(
+  'RCTDeviceEventEmitter',
+  () => require('../EventEmitter/RCTDeviceEventEmitter').default,
 );
 registerModule('RCTNativeAppEventEmitter', () =>
   require('../EventEmitter/RCTNativeAppEventEmitter'),

Libraries/EventEmitter/NativeEventEmitter.js

@@ -26,7 +26,7 @@ type NativeModule = {
  * Abstract base class for implementing event-emitting modules. This implements
  * a subset of the standard EventEmitter node module API.
  */
-class NativeEventEmitter extends EventEmitter {
+export default class NativeEventEmitter extends EventEmitter {
   _nativeModule: ?NativeModule;
 
   constructor(nativeModule: ?NativeModule) {
@@ -64,5 +64,3 @@ class NativeEventEmitter extends EventEmitter {
     super.removeSubscription(subscription);
   }
 }
-
-module.exports = NativeEventEmitter;

Libraries/EventEmitter/RCTDeviceEventEmitter.js

@@ -80,4 +80,4 @@ class RCTDeviceEventEmitter extends EventEmitter {
   }
 }
 
-module.exports = (new RCTDeviceEventEmitter(): RCTDeviceEventEmitter);
+export default (new RCTDeviceEventEmitter(): RCTDeviceEventEmitter);

Libraries/EventEmitter/__mocks__/NativeEventEmitter.js

@@ -16,10 +16,8 @@ import RCTDeviceEventEmitter from '../RCTDeviceEventEmitter';
 /**
  * Mock the NativeEventEmitter as a normal JS EventEmitter.
  */
-class NativeEventEmitter extends EventEmitter {
+export default class NativeEventEmitter extends EventEmitter {
   constructor() {
     super(RCTDeviceEventEmitter.sharedSubscriber);
   }
 }
-
-module.exports = NativeEventEmitter;

index.js

@@ -368,7 +368,7 @@ module.exports = {
       .default;
   },
   get NativeEventEmitter(): NativeEventEmitter {
-    return require('./Libraries/EventEmitter/NativeEventEmitter');
+    return require('./Libraries/EventEmitter/NativeEventEmitter').default;
   },
   get Networking(): Networking {
     return require('./Libraries/Network/RCTNetworking');
@@ -448,7 +448,7 @@ module.exports = {
 
   // Plugins
   get DeviceEventEmitter(): RCTDeviceEventEmitter {
-    return require('./Libraries/EventEmitter/RCTDeviceEventEmitter');
+    return require('./Libraries/EventEmitter/RCTDeviceEventEmitter').default;
   },
   get NativeAppEventEmitter(): RCTNativeAppEventEmitter {
     return require('./Libraries/EventEmitter/RCTNativeAppEventEmitter');