Declaritively initializing service worker

src/pages/index/index.js

@@ -4,9 +4,12 @@ import ReactDOM from 'react-dom';
 import App from '../../components/App';
 
 import '../../style.css';
-import '../../service-worker';
+import { setupServiceWorker } from '../../service-worker';
 import { setupGA } from '../../analytics';
 
+if (process.env.NODE_ENV === 'production') {
+  setupServiceWorker();
+}
 setupGA();
 
 ReactDOM.render(<App/>, document.getElementById('root'));