The rust+wasm story is quite nice these days. I've been working on a rust+wasm SPA for a few months and I have yet to run into issues with the tooling (wasm-pack, wasm-bindgen, etc).
Fromy past experience working woth wasm-bindgen, it seems that you cannot get auto-completion for web APIs due to the fact that they are generated dynamically. Is this issue resolved now? What IDE/editor do you use to enable that?