Dynamic languages large code based are, in my 14yo experience, much much harder.
Today no one a serious project with javascritpt, AFAIK everybody use typescript. Why?
JavaScript is a badly designed language. It was created on the fly over several decades by browser makers. People prefer to code in absolutely anything else.
Actually it was written (so it was done) in roughly two weeks and then released. The rest is part of modern history in terms of distribution of software and backward compatibility/portability.
The two other languages you mention, TypeScript and WASM, are more part of the same platform mutually benefiting from the progress than competing each other.
WASM will probably kill TypeScript shortly.