import { ITelegramClient } from '../../client.types.js';
import { User } from '../../types/index.js';
/**
 * Change username of the current user.
 *
 * Note that bots usernames must be changed through
 * bot support or re-created from scratch.
 *
 * @param username  New username (5-32 chars, allowed chars: `a-zA-Z0-9_`), or `null` to remove
 */
export declare function setMyUsername(client: ITelegramClient, username: string | null): Promise<User>;