The node.js std lib has had async versions of some of their modules for a while, eg fs/promise[1] I know node.js uses epoll but I am pretty sure bun uses io_uring.

Also worth mentioning Zig has a realy great iouring library[2] right in the stdlib, which without looking up the source code I am guessing is what bun uses under the hood:

[1] https://nodejs.org/api/fs.html#promises-api

[2] https://ziglang.org/documentation/0.13.0/std/#std.os.linux.I... - (give it a minute to load, the zig people are great system programmers but webdevs they are not lol)

Node.js has had async version of their modules from the very first version (or at least, long before it got popular). The "/promises" modules just wrap that in promises so you can use it with a nicer interface and async/await syntax (the original versions were callback based).

Wow, the Zig lib is as close to raw io_uring as it gets. It directly accepts an fd, a submission, and a result queue.