create-chrome-ext/template-react-js/src/popup/index.jsx

Scaffolding your chrome extension, multiple boilerplates supported!

import React from 'react'
import ReactDOM from 'react-dom/client'
import { Popup } from './Popup'
import './index.css'

ReactDOM.createRoot(document.getElementById('app')).render(
  <React.StrictMode>
    <Popup />
  </React.StrictMode>,
)