Create React App already contains:

- "@typescript-eslint/eslint-plugin": "^3.3.0"

- "@typescript-eslint/parser": "^3.3.0"

https://github.com/facebook/create-react-app/blob/c8ea284ab38cd57d3fdffa16d21702fd02c4623b/packages/react-scripts/package.json#L34-L35

If you run `npm install @typescript-eslint/eslint-plugin @typescript-eslint/parser` it will install version 4.x which will cause issues out of the box it by declaring:

`'React' was used before it was defined @typescript-eslint/no-use-before-define` when running `npm start`