import { ITelegramClient } from '../../client.types.js';
import { InputPeerLike } from '../../types/index.js';
/**
 * Change supergroup/channel username
 *
 * You must be an administrator and have the appropriate permissions.
 *
 * @param chatId  Chat ID or current username
 * @param username  New username, or `null` to remove
 */
export declare function setChatUsername(client: ITelegramClient, chatId: InputPeerLike, username: string | null): Promise<void>;