/**
 * Calculate the MD5 hash of value
 *
 * @param {string} value
 * @returns {*}  {string}
 */
export declare function md5(value: string): string;
/**
 * Calculate the value of MD5 hash value, including simple salt
 *
 * @param {string} value
 * @param {string} [salt='abcdefghijklmnopqrstuvwxyz1234567890']
 * @returns {*}  {string}
 */
export declare function md5Salt(value: string, salt?: string): string;