relay-composite-network-layer

RelayCompositeNetworkLayer is a Relay Network Layer that composes multiple GraphQL schemas into a single unified schema. It allows Relay to generate queries against the merged schema while automatically splitting and routing sub-queries to their respective network layers, such as local and remote schemas. This enables seamless integration of client-side and server-side data within a single Relay application.

Key Features

• Schema Merging — Combines multiple GraphQL schemas (e.g., local and server) into one cohesive schema for Relay to use.
• Query Splitting — Automatically decomposes Relay queries by schema and executes them on the appropriate network layer.
• Sequential Execution — Handles dependencies between queries across schemas, running them in order when necessary.
• Mutation Support — Routes mutations to the correct schema and merges payloads, just like queries.
• Node Interface Requirement — Ensures type consistency across schemas by requiring merged objects to implement the node interface.

Philosophy

It embraces a modular approach to data fetching, allowing developers to cleanly separate concerns between local and remote data while presenting a unified GraphQL interface to Relay.