This is introductory material, I bought it because I starting a new position as a full stack developer and I only have experience with typescript.
The book is well printed and sturdy, I usually bend it really hard and not a single page fell off. Usually, all Packt books are sturdy(so far).
The book covers a wide range of subjects. From basic of the language like variable declaration, class construction, interfaces, and some advanced topics like extension libraries. Fairly complete in that sense.
The book has some links that you have to write on your browser yourself where you can download some important material, like a database creation script that you have to use to write some examples.
There is a chapter about artificial intelligence, very basic, not sure it adds something to the book, it's interesting and doesn't hurt, but is too basic to be useful. Still, there is some code that you can play with.
There are also two chapters at the end of the book that I totally skip, one about developing windows applications, and the other about developing mobile applications. Totally out of the scope of my interests. Not sure if somebody will find them useful.
Overall a good book. The examples work as far as I was able to test. Recommended for beginers.