Not the op, but this TS migration started long before AI was able to help. It was done slowly and carefully, as a project supporting millions of users should. And the benefits are very clear.

Bun’s port was a vibe coding fever dream that happened from one day to the next, with much looser motive, and yet to be proven reliable.

I don't think irresponsible is the right word, but it has drastically reduced Bun's appeal. All the tools we use have a brand to them, and Bun basically changed their brand overnight to "reckless" in my eyes.

It's unknowable, because the PR is unreviewable. The Bun migration PR is larger than any model ever made can fit into context. You just have to pray that test coverage is sufficient to catch all of the possible errors, which it almost certainly isn't.