- Added new plugins and features: Fastify Appwrite plugin, diagnostics channel publishing at initialization, a Webpack test stack, and TypeScript types for routing.
- Fixed multiple bugs including schema controller errors, unresponsive server issues, content‑type parser handling after removal, header immutability, and error‑message checks.
- Improved documentation (ESM syntax, AJV8 usage, HTTP status on validation, syntax fixes) and added a contributing guide, with minor CI semver automation updates.
v3.21.0
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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.