JS is so basic (compared to Python, Go, Java, or Rust) that one can easily make a framework which will do something specific.
You can then use it to get a job.
You can then use it to get a job.
You can build a new framework and use that as your portfolio. JS apps like these can be quickly tried in the browser. That's not true of a new Go/Rust/Java library.
JavaScript / Typescript will probably always have a size advantage over WASM anyway because they don't have to ship any runtimes or standard library code. E.g. formatting a string or running a regex in JS is just a few bytes but in Rust you have to ship a whole string formatting/regex library.
Apart from some big companies, no one seem to use it.
No compiler.
No strong types.
No function return types.
And you can combine different types in unexpected ways https://www.destroyallsoftware.com/talks/wat
When the code fails, just refresh the page!