import type { MudletMap } from '../mapIO';
export declare const ACKS_USERDATA_KEY = "mme_acks";
/**
 * Fingerprint based on sorted area IDs. Stable across filename changes;
 * invalidates when areas are added or removed.
 */
export declare function mapAckKey(map: MudletMap): string;
export declare function loadAcks(mapKey: string): Set<string>;
export declare function saveAcks(mapKey: string, acks: Set<string>): void;
export declare function loadAckInUserdata(mapKey: string): boolean;
export declare function saveAckInUserdata(mapKey: string, value: boolean): void;