Old and abandoned (?), I don't think the poster realized this is not a new new framework. I mean, it was new years ago, before JS async was a thing even.

Here is a post from 2013 explaining how Koa eliminates callbacks with yields.

https://blog.stevensanderson.com/2013/12/21/experiments-with...

Yeah, to be fair while this link was submitted now, the project's site is from like 2014.