/**
 * Retrieves the last update check timestamp for the specified package.
 * @param packageName
 * @returns - The timestamp of the last update check, or undefined if the check failed.
 */
export declare const getLastUpdate: (packageName: string) => number | undefined;
/**
 * Saves the last update time for a given package.
 * @param packageName
 */
export declare const saveLastUpdate: (packageName: string) => void;