React role for individual folders

General App.js suffix will be changed to jsx.
index.js Code:

import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import 'normalize.css/normalize.css';

import store from './store';
import './index.css';
import App from './App.jsx';

ReactDOM.render(
    <Provider store={store}><App/></Provider>,
    document.getElementById('root')
);