import { RemoveUIMessage, UIMessage } from "./types.js";
//#region src/uiMessages.d.ts
type UIUpdate = UIMessage | RemoveUIMessage;
declare const isUIUpdate: (value: unknown) => value is UIUpdate | readonly UIUpdate[];
declare const applyUIUpdate: (list: readonly UIMessage[], update: UIUpdate | readonly UIUpdate[]) => UIMessage[];
/**
 * Pulls a UI update out of a raw `custom`-channel event. The graph writes the
 * `UIMessage` straight to the channel, so it lands at `params.data`; some
 * transports wrap it one level deeper at `params.data.payload`.
 */
declare const extractUIUpdate: (event: unknown) => UIUpdate | readonly UIUpdate[] | undefined;
declare const foldUIUpdates: (events: readonly unknown[]) => UIMessage[];
/**
 * Merges live-streamed UI with the state snapshot. The snapshot is
 * authoritative by id: once a UI lands in graph state it supersedes its live
 * copy. A consequence is that a live `remove-ui` is overridden while the
 * snapshot still contains that id; the removal only takes visible effect once
 * the snapshot catches up.
 */
declare const mergeUIMessages: (live: readonly UIMessage[], snapshot: unknown) => UIMessage[];
//#endregion
export { UIUpdate, applyUIUpdate, extractUIUpdate, foldUIUpdates, isUIUpdate, mergeUIMessages };
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