What Does React Do with All These Components?

If you follow the trail of all components and their import and export statements to the top, you will find a root.render(...) instruction in the main entry script of the React project. Typically, this main entry script can be found in the main.jsx file, located in the project’s src/ folder. This render() method, which is provided by the React library (to be precise, by the react-dom package), takes a snippet of JSX code and interprets and executes it for you.

The complete snippet you find in the root entry file (main.jsx) typically looks like this:

import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App.jsx';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);

The exact code you find in your new React project might look slightly different.

It may, for instance, include...