myblog/node_modules/bs-recipes/recipes/webpack.react-hot-loader/app/js/main.js

import React from 'react';
import { render } from 'react-dom';
// It's important to not define HelloWorld component right in this file
// because in that case it will do full page reload on change
import HelloWorld from './HelloWorld.jsx';

render(<HelloWorld />, document.getElementById('react-root'));