refactor: separate index to react and sw providers

src/index.js

@@ -1,12 +1,2 @@
-import React from 'react';
-import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
-import * as serviceWorker from './serviceWorker';
-
-ReactDOM.render(<App />, document.getElementById('root'));
-
-// If you want your app to work offline and load faster, you can change
-// unregister() to register() below. Note this comes with some pitfalls.
-// Learn more about service workers: http://bit.ly/CRA-PWA
-serviceWorker.unregister();
+import './providers/react';
+import './providers/service-worker';

src/providers/react.js

@@ -0,0 +1,6 @@
+import React from 'react';
+import { render } from 'react-dom';
+import '../index.css';
+import App from '../App';
+
+render(<App />, document.getElementById('root'));

src/providers/service-worker.js

@@ -0,0 +1,6 @@
+import * as serviceWorker from '../serviceWorker';
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: http://bit.ly/CRA-PWA
+serviceWorker.unregister();