Programming

There just isn't much use for an approach like this, unfortunately. TypeScript doesn't stand alone enough for it. If you want to know how functions work, you need to learn how JavaScript functions work, because TypeScript doesn't change that. It adds some error checking on top of what's already there, but that's it.

An integrated approach would just be a JavaScript book with all the code samples edited slightly to include type annotations, a heavily revised chapter on types (which would be the only place where all those type annotations make any difference at all, in the rest of the book they'd just be there, unremarked upon), and a new chapter on interoperating with vanilla JavaScript. Seeing as the TypeScript documentation is already focused on those exact topics (adding type annotations to existing code, describing how types work, and how to work with other people's JavaScript libraries that you want to use too), you can get almost exactly the same results by taking a JavaScript book and stapling the TypeScript documentation to the end of it, and it'd have the advantage of keeping the two separate so that you can easily tell what things belong to which side.