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npx create-react-app my-app --template typescript npm install --save typescript @types/node @types/react @types/react-dom @types/jest
npx create-react-app my-app --template typescript
npm install --save typescript @types/node @types/react @types/react-dom @types/jest
백엔드와 사용하는 포트가 3000으로 똑같기에 package.json의 scripts의 start 부분을 아래와 같이 수정 "start": "export PORT=4000 && react-scripts start"