Both. This was a while ago (early this year, late last year?). I didn't care about the runtime, but the package manager kept crashing, and I spent a few hours digging through the error logs and trying to fix each error one by one, but never got far enough to actually successfully build my project. (It was just a basic static-file TypeScript app with lots of older dependencies).

I unfortunately don't have the logs anymore. I'd be happy to try Bun again on new personal projects, but I'd be afraid of using it for any real-world work project at this point; the risk of having to spend time debugging it isn't worth the performance improvements (since the packagers are usually just run on CI/CD anyway, and local `next dev` or similar is already fast enough).