There are many viable compile-to-js languages out there to pick from:

* clojurescript

* f# via fable

* c# via different means(even an MSIL compiler)

* Golang

* etc

I mean, clojurescript and F# are bomber if you want functional. Typescript may give the best interop with existing packages, but I've read good things about F#'s .d.ts file support for creating type providers. In any case, if the lang you pick creates a bit of extra work that's probably small beans compared to the work required to get all of what parent described with completely separate languages and platforms.

And many developers loathe C++. Why should I have to use such a low level and antiquated language for developing a GUI?

Nowadays you don't even have to use JS/TS, there are many languages that target JS and have decent bindings to its ecosystem, such as Scala, Purescript, Clojure. This doesn't seem to be the case with Qt which lacks decent bindings to languages other than Python.

Sure, you can hate a programming language. It changes absolutely nothing, except your potential revenue streams.

It's like saying "I loathe Linux!!" and knowing nothing about it; sure, but in this industry, you're going to have a tough time :)

I not a fan of javascript either, although I write js almost evey day and use Atom mainly because I could not find a better open source desktop editor that looks and works like Sublime Text. If anyone cares to write one in C++, D, Rust or Go, I'll happily use it.