Cloudflare rewrites Next.js as AI rewrites commercial open source - The Pragmatic Engineer

Pre-AI, this reimplementation would have taken years of engineering time to complete. Doing what Cloudflare did was always possible in theory, but never seemed practical.

Separately but relatedly, Cloudflare has now proved that the cost of rewriting existing software has become ~100x cheaper, thanks to AI, and this economy is likely to be the case for maintenance, too. Considering how trivial it was to rebuild one of the more complex open source projects, this augurs well for it being trivial and much cheaper to maintain in the future.