web/src/index.tsx

import React from 'react'
import { ThemeSwitcherProvider } from 'react-css-theme-switcher'
import ReactDOM from 'react-dom'
import { BrowserRouter } from 'react-router-dom'
import App from './App'
import './index.css'
import reportWebVitals from './reportWebVitals'
import * as serviceWorkerRegistration from './serviceWorkerRegistration'


ReactDOM.render(
  <ThemeSwitcherProvider defaultTheme="dark" themeMap={{ light: '/app.css', dark: '/app.dark.css' }}>
    <BrowserRouter>
      <App />
    </BrowserRouter>
  </ThemeSwitcherProvider>,
  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://cra.link/PWA
serviceWorkerRegistration.register()

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals()