Typescript is basically a JavaScript linter. The benefit is that JavaScript JIT compilers have a few decades of research behind them, all the way back to Small

Typescript is basically a JavaScript linter. The benefit is that JavaScript JIT compilers have a few decades of research behind them, all the way back to Smalltalk and SELF. So in many cases you can still stay with V8 or JavaScript Core, instead of rewriting into something else, regardless of the whole rewriting into Rust that is now fashionable.