If you check out the dev branch of bullseye, I'm currently working on a rewrite, but it's on pause for a few months while I work on an internship.
Out of curiosity: what is the inspiration for this and what's the goal?
As for the goal, I just want to finish it for now. I don't intend to publish packages in Bullseye, rather just to use it in projects to consume existing Dart libraries.
Good luck!