I can't speak to the general case, but there's no `libc` compatibility cruft in my app. None of my dependencies try to talk to the operating system, and the Rus

I can't speak to the general case, but there's no `libc` compatibility cruft in my app. None of my dependencies try to talk to the operating system, and the Rust I wrote in this project uses `js-sys` and `web-sys` directly. If you're minimizing binary sizes, the biggest thing to avoid is `std::fmt`. This requires a little planning but is still quite achievable. #[no_std] crates are always safe to pick, and most of the popular std-dependent crates can be used too though you might need to toggle some features off.