Just a quick suggestion for your package.json that is created as part of a new cra-ts app.

Could we consider changing TypeScript to be a peerDependency in react-scripts-ts and a devDependency in the application's package.json instead of a dependency inside of react-scripts-ts? This would allow the developer to be in control of the version of TS to use, while being able to stay on the latest flavor of react-scripts-ts.

Our company has had issues in the past in a large code base where we've had to stay back a minor version or two of TypeScript to fix issues that prevented us from upgrading.

Cheers!