@langchain/langgraph-sdk/dist/react-ui/types.cjs

Client library for interacting with the LangGraph API

//#region src/react-ui/types.ts
function isUIMessage(message) {
	if (typeof message !== "object" || message == null) return false;
	if (!("type" in message)) return false;
	return message.type === "ui";
}
function isRemoveUIMessage(message) {
	if (typeof message !== "object" || message == null) return false;
	if (!("type" in message)) return false;
	return message.type === "remove-ui";
}
function uiMessageReducer(state, update) {
	const events = Array.isArray(update) ? update : [update];
	let newState = state.slice();
	for (const event of events) {
		if (event.type === "remove-ui") {
			newState = newState.filter((ui) => ui.id !== event.id);
			continue;
		}
		const index = state.findIndex((ui) => ui.id === event.id);
		if (index !== -1) newState[index] = typeof event.metadata === "object" && event.metadata != null && event.metadata.merge ? {
			...event,
			props: {
				...state[index].props,
				...event.props
			}
		} : event;
		else newState.push(event);
	}
	return newState;
}
//#endregion
exports.isRemoveUIMessage = isRemoveUIMessage;
exports.isUIMessage = isUIMessage;
exports.uiMessageReducer = uiMessageReducer;

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