Just coded a contract-based project with it. Both backend and frontend (react) were programmed in TypeScript.
I should say that I have used typescript before on smaller one-to-three file size projects. It was mostly stuff like linear equation systems, matrix operations, basic sorting algorithms, etc.
It makes you write better, quality code, and saves time.
Visual studio code has been really good with all the helpful linting and completion suggestions.
The “IntelliSense” is great with TypeScript, I was able to extend the basic express request interface and got hints everywhere. The same goes for Mongoose Models.
I’m still learning. Will be using it in more projects.