import type { ExportData, HealthResult, RoundMeta, SyncLog, ChangeNotification } from "./types.js";
/** Save an export atomically — writes to a temp directory then renames.
 *  Skips writing if the data on disk is identical (idempotent). */
export declare function saveExport(data: ExportData, date?: string): Promise<string>;
/** Compare two exports for equality using deep structural comparison */
export declare function exportsEqual(a: ExportData, b: ExportData): boolean;
/** Save an export grouped by test round (requisitionId).
 *  Merges results sharing a requisitionId into a single directory keyed by earliest visit date.
 *  Writes round-meta.json alongside export files. Returns sorted list of saved round dates. */
export declare function saveRoundExport(data: ExportData): Promise<string[]>;
/** Load round metadata for a given export date */
export declare function loadRoundMeta(date: string): Promise<RoundMeta | null>;
/** Migrate old per-visit exports to round-based exports.
 *  Idempotent: detects un-migrated directories (no round-meta.json),
 *  groups by requisitionId, merges into earliest-date directories. */
export declare function migrateToRounds(): Promise<void>;
/** Update the requisition count in the sync log (separate from per-export tracking) */
export declare function updateRequisitionCount(count: number): Promise<void>;
/** Load the most recent export (reads pointer file, then loads the export) */
export declare function loadLatest(): Promise<ExportData | null>;
/** Load a specific export by date */
export declare function loadExport(date: string): Promise<ExportData | null>;
/** Load only results from a specific export (lightweight for history lookups) */
export declare function loadExportResults(date: string): Promise<HealthResult[]>;
/** List all export dates (sorted ascending) */
export declare function listExports(): Promise<string[]>;
/** Get sync log */
export declare function getSyncLog(): Promise<SyncLog>;
/** Save a change notification as a timestamped JSON file. Prunes oldest files beyond MAX_CHANGE_FILES. */
export declare function saveChangeNotification(n: ChangeNotification): Promise<string>;
/** Load all change notifications, sorted ascending by timestamp.
 *  Returns notifications and their filenames for safe clearing. */
export declare function loadChangeNotifications(): Promise<{
    notifications: ChangeNotification[];
    files: string[];
}>;
/** Clear specific change notification files. Only deletes the named files,
 *  avoiding race conditions with notifications created after the read. */
export declare function clearChangeNotifications(files: string[]): Promise<number>;
/** Load all round exports and merge into a single aggregated ExportData.
 *  Returns null if no exports exist. Also returns the round count to avoid redundant listExports() calls. */
export declare function loadAllExportsAggregated(): Promise<{
    data: ExportData | null;
    roundCount: number;
}>;