Yes, Deno uses it as its internal event loop for JS code.
Fun party fact: long ago, Rust had libuv built in too.
... for not-so-fun parties. ;-)
why’d they move past it? does libuv not fit well in rust?
Back then, Rust had a built-in runtime. It was removed, and libuv with it.
Rust used to have a lot of stuff built into the language, including garbage collection![0] I think that a long time ago they chose to move stuff out into libraries so that Rust could be a serious competitor to C++.