WebAssembly still has a long way to go. They don't have a plan yet for:
* GC
* Interoperating with browser objects (even strings)
* Debugging and other tooling
I don't think any high level language will be able to compete with JS on an even playing field until that language can use the high performance GC that's already in every browser.
If your language has to either not use GC (huge productivity loss) or ship your own GC to the end user with your app (huge app size), it's an unfair fight.
* GC
* Interoperating with browser objects (even strings)
* Debugging and other tooling
I don't think any high level language will be able to compete with JS on an even playing field until that language can use the high performance GC that's already in every browser.
If your language has to either not use GC (huge productivity loss) or ship your own GC to the end user with your app (huge app size), it's an unfair fight.