Feature flags are the single biggest unlock for shipping confidently to large user bases. They turn deploys into low-stakes events, which is the only way to actually deploy multiple times a day.
But most flag setups in Next.js either break edge rendering or make your types lie. We're going to fix both. The setup takes about an afternoon and is worth ten times that in saved incidents.
We'll cover the pattern, the gotchas, and a tiny utility we open-sourced that wraps the whole thing in five lines of code.
