Relay Compiler

A GraphQL compiler and runtime for building data-driven React applications with colocated data requirements. The compiler processes GraphQL fragments and queries embedded in JavaScript/TypeScript files, generating optimized artifacts for runtime. It features static type generation, persisted queries, schema validation, and integration with Relay's runtime. The stable version is v20.1.1, with regular monthly releases including breaking changes, new features, and bug fixes. Key differentiators: first-class support for React, advanced data masking, incremental data delivery, and strong integration with the Relay ecosystem including resolvers and client state management.