- Added several TypeScript enhancements: clientErrorHandler definition, serializer request/response types, compilers factory with transient AJV, AJV options support, and decorator dependency type validation.
- Fixed content‑length not updating after onSend hook, corrected benchmark script requires and broken TypeScript doc link, and improved reply‑sent monitoring.
- Updated Validation and Serialization documentation and performed numerous dependency upgrades (fluent‑json‑schema, @types/node, ESLint plugin, etc.).
v3.16.0
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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.