You can do it like this:

create-react-app my-app --scripts-version=react-scripts-ts

See https://github.com/wmonk/create-react-app-typescript

No ejecting required for this.

This is the way to go:

# update create-react-app first
npm update -g create-react-app 
create-react-app my-app --typescript

Create React App v2.1.0 now supports TypeScript, so you no longer need to eject or use the react-scripts-ts fork;

Or you can add TypeScript to the existing app:

yarn add typescript @types/node @types/react @types/react-dom @types/jest
# or
npm install --save typescript @types/node @types/react @types/react-dom @types/jest  

then rename .js files to .tsx files to start using TypeScript.

Note that a tsconfig.json will be created for you when you run the app. You will be able to edit tsconfig.json except for some options.

Credits:

[1] Vincent answer

[2] migrate create react app typescript post

Typescript is available out of the box now, in create-react-app version 2.1!

You can use it now, like this (as shown here): npx create-react-app@next app-name --scripts-version=2.0.6-next.c662dfb0 --typescript