A modern programming language that makes developers happier.

kotlinlang

It's crazy how difficult it is to get started with KotlinJS if we want to use dependencies (e.g. PixiJS in my case)... The documentation really doesn't help at all

True, however when I was just getting started with kotlin js community here was amazing help. Also there are plenty open source projects with kotlin js out there for inspiration as well

And once you get a grip on it, js interop is really quite easy. Especially with the help of dukat to generate bindings for you