frontend/smart-hut/src/index.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import * as serviceWorker from './serviceWorker';
//React Router
import { BrowserRouter as Router} from 'react-router-dom';

ReactDOM.render(
    <Router>
        <App />
    </Router>
    , 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: https://bit.ly/CRA-PWA
serviceWorker.unregister();