This project was bootstrapped with Create React App (CRA) v4 and then babylonjs-react was added. For TypeScript

npx create-react-app your-babylonjs-app --template typescript

Add babylonjs dependencies:

yarn add react-babylonjs
yarn add @babylonjs/core
yarn add @babylonjs/gui
# loaders are optional
yarn add @babylonjs/loaders

All of the code for the site is in /src/App.tsx

In the project directory, you can run:

npm start / yarn start

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console.

View live demo