Comment by kodablah

Looking at the code this should be quite simple since libc is the only dep. You can Emscripten at first to be easy, but to wrap it up as a JS lib, you can probably implement the libc calls yourself easily and remove the Emscripten dep. The author even broke off bf_realloc to put your own alloc impl (which can be written in WASM, but I suggest writing it in C before the compilation).