- Added route‑level lifecycle hooks and a new schema controller layer, expanding Fastify’s extensibility.
- Updated documentation extensively, including ecosystem plugins, TypeScript installation guide, Swagger description, and JSDoc usage.
- Fixed various bugs such as header name case handling, missing hijack function in reply.d.ts, link preview routing, and route context copying.
v3.12.0
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Fix for two Fastify security advisories (GHSA‑w2qp‑rph6‑63g4 and GHSA‑3m5p‑2c4r‑xxw2).
Added per‑route logging for Google Cloud Functions and introduced `Reply.prototype.mediaType` for easier content‑type handling.
Fixed trailer state clearing when removing all trailers and corrected requestCompleted handling to use null instead of undefined.