Access LangGraph StreamWriter from inside a graph node or entrypoint task at runtime.
Can be called from inside any StateGraph node or
functional API task.
If you are using Python < 3.11 and are running LangGraph asynchronously,
get_stream_writer() won't work since it uses contextvar propagation (only available in Python >= 3.11).
Push a new UI message to update the UI state.
This function creates and sends a UI message that will be rendered in the UI. It also updates the graph state with the new UI message.
Delete a UI message by ID from the UI state.
This function creates and sends a message to remove a UI component from the current state. It also updates the graph state to remove the UI message.
Merge two lists of UI messages, supporting removing UI messages.
This function combines two lists of UI messages, handling both regular UI messages
and remove-ui messages. When a remove-ui message is encountered, it removes any
UI message with the matching ID from the current state.
A message type for UI updates in LangGraph.
This TypedDict represents a UI message that can be sent to update the UI state. It contains information about the UI component to render and its properties.
A message type for removing UI components in LangGraph.
This TypedDict represents a message that can be sent to remove a UI component from the current state.
