electron flow type definitions

Summary: Adding a flowtype library definition for electron 3 and fixing related type errors

Reviewed By: passy

Differential Revision: D9124758

fbshipit-source-id: e09cb5b05ba952e7f95f68f9043edc586f81ae83

src/dispatcher/application.js

@@ -11,16 +11,16 @@ import type Logger from '../fb-stubs/Logger.js';
 
 export default (store: Store, logger: Logger) => {
   const currentWindow = remote.getCurrentWindow();
-  currentWindow.on('focus', () =>
+  currentWindow.on('focus', () => {
     store.dispatch({
       type: 'windowIsFocused',
       payload: true,
-    }),
-  );
-  currentWindow.on('blur', () =>
+    });
+  });
+  currentWindow.on('blur', () => {
     store.dispatch({
       type: 'windowIsFocused',
       payload: false,
-    }),
-  );
+    });
+  });
 };