/**
 * create an argon2 hash
 *
 * @param {string} plain plain text
 * @returns {Promise<string>} hash
 */
export function hash(plain: string): Promise<string>;
/**
 * verify a plain text against an argon2 hash
 *
 * @param {string} hash_str hash
 * @param {string} plain plain text
 * @returns {Promise<boolean>} true if valid
 */
export function verify(hash_str: string, plain: string): Promise<boolean>;