mercurius-js/mercurius-federation

`@mercuriusjs/federation` is a module that adds Apollo Federation v1 metadata to GraphQL schemas, enabling services to participate in a federated graph architecture. It provides both a Fastify plugin (`mercuriusFederationPlugin`) and a utility function (`buildFederationSchema`) to create schemas compatible with Mercurius Federation. This tool is designed for developers building microservices with Fastify and Mercurius who need to implement Apollo Federation for distributed GraphQL schemas.