Healthcheck Next.js compatibility

The package targets Web Request/Response App Router handlers and depends on current core and Prometheus packages. It publishes ESM, CommonJS, and declarations; no Next.js peer is declared.

Repository tests cover factory behavior, but no broad Next.js-version matrix is claimed. Node-only manager checks require a Node route runtime. IPv4 protection is supported; IPv6 CIDR matching is not.

No Next.js peer range or minimum version is declared. The current contract is the App Router Web Request/Response interface, and the active docs gate type-checks on Node 22 without booting Next.js. Verify the route against the exact Next.js version pinned by your application.