So from my understanding the new WASM backend is no longer using LLVM… If not, then what is it using? How is Kotlin creating wasm file?

It is a new compiler backend like jvm or js (and I guess some parts of js are shared).

It uses its own code for emitting wasm binary

If my understanding is correct, the first step is done by K2, so it's common with all platforms, right?

Currently, the first step is K1. But we plan to move it to K2 with all other platforms.

JS IR uses K1 too, right?

It does, currently.

Thanks, sorry for derailing the subject a bit 🙏

@CLOVIS thanks for asking these questions. I was working on the similar assumptions as well. This clears up things a biy for me too