Export init function

Summary: This way we can mock it during tests.

Reviewed By: jknoxville

Differential Revision: D9788349

fbshipit-source-id: 55b2a61186e6294a8098db7add50fd8bbac7a680

src/__mocks__/init.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+export default function init() {
+  // no-op
+}

src/index.js

@@ -14,9 +14,10 @@ export {SonarBasePlugin, SonarPlugin, SonarDevicePlugin} from './plugin.js';
 export {createTablePlugin} from './createTablePlugin.js';
 export {default as SonarSidebar} from './chrome/SonarSidebar.js';
 
-export * from './init.js';
-export {default} from './init.js';
-
 export {default as AndroidDevice} from './devices/AndroidDevice.js';
 export {default as Device} from './devices/BaseDevice.js';
 export {default as IOSDevice} from './devices/IOSDevice.js';
+
+import init from './init.js';
+
+init();

src/init.js

@@ -62,10 +62,11 @@ const AppFrame = () => (
   </TooltipProvider>
 );
 
-// $FlowFixMe: this element exists!
-ReactDOM.render(<AppFrame />, document.getElementById('root'));
-// $FlowFixMe: service workers exist!
-navigator.serviceWorker
+export default function init() {
+  // $FlowFixMe: this element exists!
+  ReactDOM.render(<AppFrame />, document.getElementById('root'));
+  // $FlowFixMe: service workers exist!
+  navigator.serviceWorker
     .register(
       process.env.NODE_ENV === 'production'
         ? path.join(__dirname, 'serviceWorker.js')
@@ -75,3 +76,4 @@ navigator.serviceWorker
       (r.installing || r.active).postMessage({precachedIcons});
     })
     .catch(console.error);
+}