npm start react

npx create-react-app my-app
cd my-app
npm startnpx create-react-app mon-app
cd mon-app
npm startnpx create-react-app your-project-namenpx create-react-app my-appcd my-appnpm startCopynpx create-react-app umusic
npm install --save typescript @types/node @types/react @types/react-dom @types/jest

# or

yarn add typescript @types/node @types/react @types/react-dom @types/jest