What it is responsible for
Platform Fastify manages the package-level boundary identified by FastifyAdapter, MiddlewareFn, and FASTIFY_ROUTE_CONFIG_METADATA. Available evidence places work into this subsystem through those symbols and Readme.md; it identifies Common and Core as its dependencies. Its documentation describes Nest as a Node.js server-side application framework, while this subsystem’s named entry points identify the Fastify-specific surface. The evidence does not describe request handling, route execution, metadata interpretation, or adapter behavior enough detail to state those mechanisms as facts.
What it refuses
Platform Fastify rejects a version constraint when its value is neither a string nor an array of strings. Its message is: “Version constraint should be a string or an array of strings.” In the condition, rejection occurs when !isString(value) && !Array.isArray(value). No other rejection conditions or messages are supplied by the evidence.
What it needs, and who needs it
Platform Fastify depends on Common and Core. Common and Core are therefore the named upstream sides required by this subsystem; without them, the dependency relationship is unmet, although the evidence does not say which symbols or runtime paths fail. No subsystem is listed as depending on Platform Fastify, so the supplied information identifies no named downstream consumer that would break without it. Work enters through FastifyAdapter, MiddlewareFn, or FASTIFY_ROUTE_CONFIG_METADATA; no other named user is identified by the supplied evidence.
Notable members
FastifyAdapter is a work entry point and the adapter-named symbol. MiddlewareFn is another entry point, identifying middleware as a named concern without documenting its signature or behavior. FASTIFY_ROUTE_CONFIG_METADATA is a constant and entry point whose name identifies route configuration metadata; the evidence does not specify its value, format, or consumers.
44 entities in packages/platform-fastify. Nothing else in this repository depends on it.
What it is made of
Its 44 entities sit in 11 files under packages/platform-fastify: 29 doc comments, 5 interfaces, 3 constants, 3 functions and 4 more.
constants.ts holds 3 of them — more than any other file here.
FastifyAdapter declares 50 methods, the widest surface here.
Where work enters
Readme.md—packages/platform-fastify/Readme.md:1FastifyAdapter—packages/platform-fastify/adapters/fastify-adapter.ts:124MiddlewareFn—packages/platform-fastify/adapters/middie/fastify-middie.ts:17FASTIFY_ROUTE_CONFIG_METADATA—packages/platform-fastify/constants.ts:1
How it refuses and fails
1 of its components records a refusal or a failure handler.
It refuses work outright, under a condition written into the component itself.
Its catch blocks handle a failure that already happened in 2 places.
Boundaries
It depends on Common, Core, and on nothing else in this repository.
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