Sure, I'll be more than happy to review a PR. Please feel free to submit one 😄

I'm interested in trying to refactor it, and I'm going to refactor using vite and vitest, can I do this？

Why would you need Vite to support ESM? Is there something I’m missing here?

No, it's purely due to personal habits, but other than that, vite and vitest are faster and have more features, and make the refactored project more "younger"

Would appreciate a PR. Please keep it vanilla without any dependencies 😊

OK, I am also think we shouldn't change to much,maybe I should create a new repo like collect-es.js?

Simply fork it and make a PR.

If you haven’t created a PR before you might want to check this out https://makeapullrequest.com/

I create a new repo to support esm😊 : https://github.com/peterroe/collect-es