where to place typescript in react code example

Example 1: React with Typescript

// to create a simple app with React and Typescript
npx create-react-app yourProjectName --template typescript

// to add Typescript in an existing project
npm install --save typescript @types/node @types/react @types/react-dom @types/jest

Example 2: add typescript in create react app

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