create-react-app/docusaurus/docs/adding-typescript.md

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adding-typescript	Adding TypeScript

Note: this feature is available with react-scripts@2.1.0 and higher.

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript.

To add TypeScript to a Create React App project, first install it:

$ 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

Next, rename any file to be a TypeScript file (e.g. src/index.js to src/index.tsx) and restart your development server!

Type errors will show up in the same console as the build one.

To learn more about TypeScript, check out its documentation.

Note: You are not required to make a tsconfig.json file, one will be made for you. You are allowed to edit the generated TypeScript configuration.

Note: If you are currently using create-react-app-typescript, see this blog post for instructions on how to migrate to Create React App.

Note: We recommend using VSCode for a better integrated experience.

Note: Constant enums and namespaces are not supported.