import CollectionSyncMetadata from "../CollectionSyncMetadata";
/** A JSON file sync metadata manager. It writes and reads the file for every request (unoptimized for the sake of testing). */
declare class JsonFileSynMetadata extends CollectionSyncMetadata {
    private _fileName;
    private readonly _initialLastFetchAt;
    private readonly _initialLastPostAt;
    constructor(fileFolderPath: string, lastFetchAt?: Date, lastPostAt?: Date);
    initialize(): Promise<void>;
    private setDatesToJsonFile;
    private getDatesFromJsonFile;
    setLastFetchAt(d: Date): Promise<void>;
    setLastPostAt(d: Date): Promise<void>;
    getLastFetchAt(): Promise<Date | undefined>;
    getLastPostAt(): Promise<Date | undefined>;
}
export default JsonFileSynMetadata;