npx create-react-app my-app cd my-app npm start
npx create-react-app mon-app cd mon-app npm start
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
npx create-react-app my-appcd my-appnpm startCopy
npx create-react-app your-project-name