react add typescript to existing project code example

Example 1: create react app with typescript config

npx create-react-app my-app --template typescript

# or

yarn create react-app my-app --template typescript

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