I've done some hobby programming[1] in Jakt and while it had promise and took good ideas from other modern languages my understanding is that it's been abandoned at this point and isn't mature enough to build anything non-trivial.

Transpiling to C++ for maximum interop with the SerenityOS codebase was an interesting idea too, but what it meant was you had to interpret C++ compiler errors to to understand what was breaking a lot of the time

1: Here's my admittedly crappy markdown->HTML converter written in Jakt https://github.com/mikeakers/r3gen