cra-template-node-express/template/src/client/index.js

You can use the template using the below command.

import { hot } from 'react-hot-loader/root';
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './index.css';

const HotApp = hot(App);

ReactDOM.render(<HotApp />, document.getElementById('app'));