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JavaScript@langchain/langgraph-sdkstreamTransportAdapter
Interface●Since v2.0

TransportAdapter

Transport abstraction implemented by concrete client transports such as WebSocket or SSE adapters.

In the thread-centric protocol, transports are bound to a specific thread at construction time — the thread ID is part of the connection URL.

Copy
interface TransportAdapter

Properties

property
threadId: string

Thread ID this transport is bound to.

Methods

method
close→ Promise<void>

Shuts down the transport and releases any underlying resources.

method
events→ AsyncIterable<Message>

Streams incoming protocol messages from the remote peer. Used by WebSocket transports where all events share one connection.

method
open→ Promise<void>

Opens the underlying connection (e.g. WebSocket handshake). For HTTP/SSE transports this is a no-op.

method
openEventStream→ EventStreamHandle

Opens an independent filtered SSE event stream. Each call creates a new server connection with the given filter. Returns undefined when the transport does not support per-subscription streams (e.g. WebSocket), in which case the caller should fall back to command-based subscriptions over events.

method
send→ Promise<void | ErrorResponse | CommandResponse>

Sends a command and optionally returns an immediate response.

View source on GitHub