JSX Backend Framework: a Joke or a Problem Solver?

It's super declarative indeed. It absolutely needs a compiler because React already has one. And it needs JSX-based template engine because.

Hi — great idea and very clear motivation. A quick tip: if you rely on a transformation/compilation to convert TSX/JSX into Fastify registrations, document and automate the build flow (tooling, errors, and rollback) to facilitate adoption and debugging.

If you'd like me to thoroughly review it (integration, testing, and publish a reproducible example), I can do so as a paid service — check my profile for contact information and availability.