fastify-typescriptlisted

# Fastify TypeScript Patterns ## Type Providers (Preferred Approach) NEVER duplicate TypeScript interfaces AND JSON schemas for the same data shape. Use a Type Provider to infer types directly from schemas, eliminating the second source of truth entirely. Type Providers statically infer TypeScript types from inline JSON Schemas at compile time. This means runtime validation is guaranteed to match compile-time types -- a non-negotiable contract that eliminates an entire class of bugs where validation and types drift apart. When a route defines a schema, the Type Provider analyzes that schema and automatically types `request.body`, `request.query`, and `request.params` inside the handler. If you change a schema field, incorrect handler code is immediately flagged at compile time. You get safety without ceremony. ### Available Providers Choose one of these two providers for your project: - **`@fastify/type-provider-typebox`** -- Uses TypeBox schemas. This is the recommended provider and offers the best developer experience. TypeBox schemas are composable, reusable TypeScript objects that produce both JSON Schema and static types from a single definition. - **`@fastify/type-provider-json-schema-to-ts`** -- Uses raw JSON Schema objects with `as const` assertions. Choose this when you already have existing JSON Schema definitions or prefer writing schemas in plain JSON Schema format. ### Usage Pattern with TypeBox Apply the Type Provider to your Fastify instance using `wit