create-react-ssr/src/frontend/index.js

import React from 'react';
import { hydrateRoot } from 'react-dom/client';
//Router
import { BrowserRouter as Router } from 'react-router-dom';
//History
import { createBrowserHistory } from 'history';
//Redux
import { createStore } from 'redux'; //, applyMiddleware
import { Provider } from 'react-redux';
import { composeWithDevTools as composeWithDevToolsWeb } from 'redux-devtools-extension';
import { config } from '../config';
import reducer from './reducers';

import App from './components/App';
import './styles/global.sass';

//Redux DevTools
/* declare global {
    interface Window {
        __REDUX_DEVTOOLS_EXTENSION_COMPOSE__?: typeof compose;
    }
} */

const { env } = config

const composeEnhancers = composeWithDevToolsWeb({
    // Specify here name, actionsBlacklist, actionsCreators and other options
});

const preloadedState = window.__PRELOADED_STATE__

const store = env === 'development' ? createStore(
    reducer,
    preloadedState,
    composeEnhancers(),
) : createStore(
    reducer,
    preloadedState,
)

delete window.__PRELOADED_STATE__

const container = document.getElementById('app');
const history = createBrowserHistory()

const root = hydrateRoot(container, 
    <Provider store={store}>
        <Router history={history}>
            <App />
        </Router>
    </Provider>,
    //Add this comment to update later app and remove warning
    /*{ 
        onRecoverableError: (error) => {
          console.error("recoverable", error);
        }
    }, */
);

// Use root.render to update later the app
/* root.render(
    <Provider store={store}>
        <Router history={history}>
            <App />
        </Router>
    </Provider>
); */

if (module.hot) {
    module.hot.accept();
}