React Relay

React Relay is a JavaScript framework developed by Meta for building highly performant and data-driven React applications using GraphQL. It provides a robust client-side data store, automatic query batching, optimistic updates, and a compile-time artifact generation process that ensures type safety and optimized network requests. Currently at version 20.1.1, Relay maintains an active development pace with frequent patch and minor releases, alongside major releases introducing significant features and breaking changes on a regular cadence. Key differentiators include its tight integration with GraphQL at a compiler level, enabling advanced optimizations like persisted queries and fragment colocation, and its comprehensive approach to client-side data management, including client-side state through Relay Resolvers. Its compiler tooling is a core component, transforming GraphQL declarations into optimized, type-safe code.