Hello friends! For more details, here's a blog post that sin-ack wrote about the porting work: https://sin-ack.github.io/posts/sycl-talk-20221007/

He also gave an in-person talk about Zig on SerenityOS at Software You Can Love 2022, there's a video of the talk here: https://www.youtube.com/watch?v=Ug3p8vELJqQ

Babel does this, using a library called gensync. I have a writeup which goes into more detail: https://writing.bakkot.com/gensync

gensync instead creates two functions, one sync and one async, which is probably a more familiar API for consumers of your code.

You can use One Weird Trick with generator functions to make your code "generic" over synchronicity. I use this technique to avoid needing to implement both sync and async versions of some functions in my quickjs-emscripten library.

The great part about this technique as a library author is that unlike choosing to use a Promise return type, this technique is invisible in my public API. I can write a function like `export function coolAlgorithm(getData: (request: I) => O | Promise<O>): R | Promise<R>`, and we get automatic performance improvement if the caller's `getData` function happens to return synchronously, without mystery generator stuff showing up in the function signature.

Helper to make a function that can be either sync or async: https://github.com/justjake/quickjs-emscripten/blob/ff211447...

Uses: https://cs.github.com/justjake/quickjs-emscripten?q=yield*+l...

This has made me rethink a lot of things. I think video on the web should probably use the webtorrent approach primarily. Thanks for posting... gonna go work on some interesting approaches now.