The benefit to Rust rewrite would be integration with the rest of the JS tooling ecosystem which is increasingly written in Rust rather than performance.

It probably won't ever happen though.

> It's easy to reimplement typescript in go 1:1 just by looking at the code.

That's also true of Rust if your codebase is written in a functional style. But apparently TSC had a lot of inheritance, which probably isn't a great fit for porting to Rust.