- Added new plugins (fastify-koa, fastify-redis-session) plus async hooks signature on routes and a preClose hook; also support for custom startup log text.
- Updated TypeScript to v5, bumped several dev dependencies, and improved documentation (spelling, MongoDB 5 guide, hook examples, upgrade guide, etc.).
- Exported FastifyBaseLogger as an interface (potential breaking change) and emitted a warning when validating undefined schemas.
v4.16.0
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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.