super-lineTypesafe WebSockets for TypeScript

One contract, split by direction and scoped by role. Requests, events, topics, rooms & inter-server messaging — with end-to-end types and zero codegen.

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The contract

API reference

🧩 Contract-first

One schema is the single source of truth; types flow to both ends with zero codegen.

🎭 Role-scoped

One contract, many client roles (user, agent…) — each gets its own surface and ctx; cross-role calls get NOT_FOUND.

🛡️ Runtime-validated

Any Standard Schema validator (Zod, Valibot, ArkType). The server validates every inbound message.

↔️ Req/res with typed errors

Unary await client.x() with timeouts, AbortSignal, and a typed SocketError model.

📡 Events, rooms & topics

Server-pushed events, server-controlled room broadcasts, and client-subscribed pub/sub streams.

📈 Scales across nodes

Rooms, topics, and serverToServer events fan out across processes via a pluggable adapter (Redis included).