I didn’t know what deno was.

It’s a typescript native alternative to nodejs that adopts the browser security model, replicates the golang standard library rather than node’s and is written in Rust.

V8 is written in C++, not Rust.

I'm pretty confident we'll see a JS engine written in Rust at some point in the future, it'll just take a very long time to get parity with V8 and will likely introduce its own slew of issues.

I rather imagine we'll see a wasm vm/runtime in rust, and a typescript/js to wasm compiler written in typescript...

Like Wasmtime? https://github.com/bytecodealliance/wasmtime