For the uninformed, C# and TypeScript are very similar[0]
In fact, JavaScript has borrowed a lot from C# including async/await, lambda expressions, and the syntax for disposables -- all influenced by and done first in C#.
Of course, TypeScript and C# are from the same designer at Microsoft so there are even more similarities. Any team that's considering moving to TypeScript should also really give C# a look.
[0] https://typescript-is-like-csharp.chrlschn.dev/pages/intro-a...
Except in performance, and tooling.