JS was designed to be dynamically typed, just as Python and others, it is at the root of those languages. I can totally imagine that with all the big web apps of today type safety is a thing for some people working in large code bases. But that doesn't mean all dynamically typed languages need to perish.
Why not create a beautiful statically typed language from scratch that compiles to WebAssembly? Why do we have to introduce a type system on top of an old and flawed language? I mean, maybe you'll get some type safety with TS, although it won't be 100%, but what about the future? How long will this toy technology stay?
For me, this is so typical for the JS community, jumping the boat in a whim. And IMHO this creates the famous Javascript fatigue. Learning disposable things. Therefore I moved back to C++ after 6 years of web development, learning things that actually make sense and that I can use for years to come. Not having to work with all those temporary black boxes that are praised by the community.