- Introduced the official TypeORM Fastify plugin, added to the ecosystem list.
- Fixed multiple TypeScript and schema validation issues, including FastifySchemaValidationError types, server property typings, and compiled schema ID handling.
- Updated migration guide, README, TypeScript docs, and added ecosystem linting; refactored reply module and listen option types.
v4.2.1
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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.