Apollo Router is a production-grade GraphQL gateway written in Rust. It accepts incoming GraphQL HTTP requests, composes a supergraph schema from subgraph schemas, plans queries across subgraphs, and executes them through a tower-style service pipeline. It supports federation, subscriptions, persisted queries, demand control, entity caching, progressive overrides, connectors, and defer. Configuration is YAML-based and can be managed via Apollo GraphOS Uplink for schema/config propagation.

This repository provides syntax highlighting for GraphQL files in Xcode. It consists of an Xcode plugin that defines a file type for .graphql files and a language specification that provides syntax coloring. The plugin adapts to the deprecation of the Xcode plugin mechanism by focusing on the file type and language specification components, which still work in recent Xcode versions. The core component, GraphQL.xclangspec, is a well-crafted language definition that covers the full GraphQL syntax.