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I was debugging some chunking regressions in an app I work on when updating from Vite 7 to Vite 8. I got an AI to generate a tool to help figuring out what was wrong, and I uploaded it at nicolo-ribaudo.github.io/vite-compare/ in case it's useful for anybody else.

Thanks for sharing! What was the outcome in your case(s)? 👀

Rolldown was over-splitting compared to Rollup, I had to manually configure some groups. It has something to do with cycles across chunks and modules imported both through a static and dynamic imports chain, but I cannot get a minimal reproduction to show the same behavior.

Interesting! Did you try using `attachDebugInfo` (which should give insights why certain chunks were created)? rolldown.rs/reference/In...

Tried now, unfortunately it's not very helpful. In my case it's telling me that chunk C is its own chunk because it's imported both by chunk A and chunk B, which is indeed true, but it does not explain why it cannot just put it inside chunk A (where chunk B is only imported through import() by A)

Ok actually I do have a minimal reproduction, opening an issue soon :)

github.com/rolldown/rol...