export declare const AREA_MAINTENANCE_CURSOR_FORMAT = 1;
export type AreaMaintenanceCursor = {
    format: typeof AREA_MAINTENANCE_CURSOR_FORMAT;
    epoch: string;
    pendingAreaIds: readonly string[];
    nextIndex: number;
};
export type AreaMaintenanceCursorStoreOptions = {
    rootDir: string;
    journalSlug: string;
    layoutEpoch: number;
};
export type AreaMaintenanceTarget = {
    maintenanceAreaIds(): readonly string[];
    maintainArea(areaId: string): unknown;
};
export type AreaMaintenanceOutcome = {
    areaId: string;
    status: "maintained";
    result: unknown;
} | {
    areaId: string;
    status: "isolated";
    error: string;
};
/**
 * One tiny cursor per journal layout.  It is advanced after each area, not at
 * the end of a sweep, so a worker restart cannot make a healthy area repeat a
 * large maintenance pass because another area was corrupt.
 */
export declare class AreaMaintenanceCursorStore {
    private readonly store;
    private constructor();
    static open(options: AreaMaintenanceCursorStoreOptions): AreaMaintenanceCursorStore;
    read(): AreaMaintenanceCursor | undefined;
    begin(epoch: string, areaIds: readonly string[]): AreaMaintenanceCursor;
    completeUnit(cursor: AreaMaintenanceCursor, areaId: string): AreaMaintenanceCursor;
}
/** Execute at most one area maintenance unit and durably checkpoint its result. */
export declare function runBoundedAreaMaintenance(target: AreaMaintenanceTarget, cursorStore: AreaMaintenanceCursorStore, epoch: string): {
    cursor: AreaMaintenanceCursor;
    outcome?: AreaMaintenanceOutcome;
    complete: boolean;
};
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