Some questions about Jest (TDD and Typescript)

I'm currently working on a big Angular project where the tests are done with the classic Jasmine/Karma (~1500 tests).

I'm wondering if going to Jest would be a good idea, and I will work a bit on that to see if it is worth it. But before I've got 2 questions I'd rather have the answer before beginning.

How well does Jest works with Typescript ?

We work with TDD flow (writing tests first), how well could it work with Jest (especially considering jest only watches git changes) ?