GraphQL SSE Library

graphql-sse is a lightweight, zero-dependency (aside from a `graphql` peer dependency) library that enables GraphQL operations, particularly subscriptions, over the Server-Sent Events (SSE) protocol. It provides both server-side handler utilities and a client for consuming SSE streams. The current stable version is 2.6.0, with releases occurring semi-regularly, focusing on bug fixes, feature enhancements like dynamic client URLs, and new framework integrations (e.g., Koa, Fastify, Express adapters). Its key differentiator is its exclusive use of SSE, making it HTTP/1 safe and suitable for environments where WebSockets might be problematic, offering a robust alternative to `graphql-ws` for subscription-heavy applications without requiring a separate WebSocket server infrastructure. It is designed for simplicity and direct integration with existing HTTP servers.