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It is unfortunate there is not a better solution for more of std on wasm. A couple years ago for some time the Rust and WebAssembly working group was making a lot of progress: https://rustwasm.github.io but their blog stopped in 2019 and progress seems to have leveled off or interest waned. Emscripten accomplished a lot, but appears to be declining in popularity for Rust; wasm32-unknown-unknown works great but is minimal and requires implementing std replacements such as by using web-sys if you want to access the web platform, maybe wasm32-wasi will be the answer, you can follow its progress here: https://github.com/WebAssembly/WASI but their intended use case from my understanding is not necessarily for the web (though, that may be what you're looking for).
In my project I have a crate to replace std::fs, which stubs out the File calls on wasm, but otherwise re-exports std::fs. Not completely functional, but good enough to compile and get past initialization without panicking due to fs unavailability.
If you compile to wasm32-unknown-unknown, then your std comes from the library module defined here: https://github.com/rust-lang/rust/blob/master/library/std/src/sys/wasm/mod.rs