@paneui/core

Typed client for the Pane relay HTTP + WebSocket API. Framework-free: no argv, no MCP, no server dependencies — just the relay protocol expressed as typed operations.

Runtime requirement: Node.js >= 20

@paneui/core targets the Node.js runtime (>= 20, as declared in package.json's engines). It is framework-free, not runtime-free.

The WebSocket transport (openStream) uses the ws package rather than the global WebSocket. ws exposes a Node-style event API (socket.on("message", ...), custom upgrade headers such as Authorization) that the browser WebSocket does not, and the relay protocol relies on it. Because of this, @paneui/core is not intended to run in a browser or other non-Node runtime as-is.

The HTTP pane (PaneClient, registerAgent) uses the standard fetch API and is runtime-agnostic; only openStream carries the Node constraint.

If you need a browser client, treat that as separate future work — it would need a ws-vs-global-WebSocket abstraction rather than the unconditional import { WebSocket } from "ws" used today.

Exports

• PaneClient / PaneApiError — typed HTTP operations against a relay.
• openStream — WebSocket stream (replay-on-connect, then live). Node only.
• registerAgent — agent registration helper.
• artifactSchema, callbackSchema, createPaneSchema — Zod schemas.