John HardyRe: Cloudflare vibe-heist
What I find most interesting here is not the source code that Vercel provided but its suite of validating unit tests.
This enabled a Vibe coding project to validate that they had covered all the functionality requirements that Vercel uses to validate its own software.
Without these tests, Cloudflare would have been in the dark and they would not have been able to have so rapidly developed this functionally complete clone of Next.js