/**
 * @description Sleep for x time
 * @param {number} ms - Milliseconds to sleep
 * @return {Promise<void>}
 */
export declare function sleep(ms: number): Promise<void>;
/**
 * @description Check if string is a valid url
 * @param {string} str - String to check
 * @return {boolean}
 */
export declare function validURL(str: string): boolean;