An update on Rolldown:
We originally planned to open source the codebase this year, but it will be pushed to Q1 2024.
We've reached the stage where Rolldown can pass all the current Vite dependency pre-bundling test cases. But as we are working towards more advanced features like tree-shaking and fine-grained code splitting control, we decided we needed to perform some pretty substantial refactors before we move forward.
As a result of that, it might not be in the best state for external contributors to jump in just yet. We are planning to open source it after we finish this refactor, and we don't expect it to take too long!