Squoosh already had wasm files built, all i had to just import and create a common API.

For now wasm can be compiled from C,C++, Rust and Go, so mostly compiled languages. https://emscripten.org/ can help compile C,C++, Rust and Go has native support to compile. There is also a Typescript like language which compile to wasm(assembly script)

Python or most dynamic languages are too difficult to compile to wasm.