Did you try looking? LLVM has a WebAssembly backend, so things that can be compiled with LLVM (from your list, at least C++ and Rust) can be compiled to WebAsse

Did you try looking? LLVM has a WebAssembly backend, so things that can be compiled with LLVM (from your list, at least C++ and Rust) can be compiled to WebAssembly as well. See a guide here: https://gist.github.com/yurydelendik/4eeff8248aeb14ce763e https://gist.github.com/yurydelendik/4eeff8248aeb14ce763e I haven't tried it; let us know how it went! Not sure how many hoops you have to jump through to compile the languages' standard libraries.