relay-fragments-patterns

Relay fragment composition lets you declare data needs alongside React components for predictable data flow. Define fragments using graphql``, colocate them with components, and use useFragment to access masked data. This approach scales component-level queries across TypeScript projects with data masking and optimized fetching.

Data masking in Relay controls what data each component can access, exposing only fields declared in its fragment. This enforces boundaries between components, prevents accidental coupling, and makes data dependencies explicit and maintainable as your React UI grows.

Yes, Relay works with TypeScript. Install react-relay, relay-runtime, relay-compiler, babel-plugin-relay, and graphql. Configure relay.config.js with language: 'typescript' and an artifactDirectory. The compiler generates type-safe fragment artifacts automatically.

Fragment arguments let you parameterize fragments so they accept variables at definition time. This enables reusable, flexible fragments that adapt to different component contexts without duplicating queries. Arguments flow through composition boundaries alongside data masking.

Colocate Relay fragments with components to declare exact data needs at each level, then compose fragments up the component tree. This colocation pattern eliminates over-fetching, reduces query complexity, and keeps data logic tightly bound to rendering logic in scalable React UIs.

No schema restructuring is required. Relay fragment composition works with any GraphQL schema. Focus on defining fragments that match your component structure and declaring connections for paginated data. The Relay compiler handles artifact generation and type checking.