Post

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.

And this was happening for a whole bunch of modules, causing the number of chunks to increase from ~50 to ~80. The solution in this example would be to manually define a group containing the entry point of the "index" chunk, and then it automatically includes what would otherwise be in "vendor"

Which isn't a very good solution and should be addressed by the rolldown team. Thanks for creating light into this complex topic

Thanks a lot for looking into this! We will investigate.