Well and build like: cargo build --target=wasm32-wasi --release as well.

I wonder how hard is this ? , would be great if someone elaborate on the high level way to implement this

I think its a great feature, it will unlock more projects that can be built against wasi to be used by deno easily

Also in the future maybe there is wasix https://wasmer.io/posts/announcing-wasix

Turns out that wasi works with deno and there is even 2 implementations to choose from , std and from wasmjs

see these issues where I have code examples of both wasmerio/wasmer-js#321 denoland/std#3415