Nodejs is written in C/C++ last I checked, and Deno is written in Rust, so they can share ideas and anything written in JS that doesn't make assumptions about the runtime/stdlib at most.

I don't remember https://github.com/nodejs/iojs.org but Bun has become pretty popular recently as a nodejs-alternative Javascript engine. It's still too nodejs-like for my liking though. Deno feels like golang without having to write golang.