@luckystack/sync

Server-authoritative, room-based realtime updates with socket and HTTP/SSE transports. Install with npm install @luckystack/sync socket.io socket.io-client; add optional React and Prisma peers only when those surfaces are used (see package.json). Browser callers import @luckystack/sync/client.

Use a server handler for shared mutations and an optional recipient handler only when individual recipients need different output. Choosing a receiver is an authorization decision, not just routing; maintain sender-side checks even when recipient filtering exists. See design context, server vs recipient, room authorization and version rationale. Source and generated maps own the API surface.