export interface LockMetadata {
    pID: number;
    lockTime: number;
}
/**
 * Reads metadata from the given file
 * @param {string} file - path to file to read metadata from
 * @returns {Promise}
 */
export declare const readMetadata: (file: string) => Promise<LockMetadata>;
/**
 * Saves metadata to the given file
 * @param {string} file - path to file to write metadata to
 * @param {number} lockTime - timestamp when lock should be registered
 * @returns {Promise}
 */
export declare const saveMetadata: (file: string, lockTime: number) => Promise<void>;