import { ErrorUnion, TextUnion } from '../outputs';
/**
 * Returns an IETF language tag of the language preferred in the country, which should
 * be used to fill native fields in Telegram Passport personal details. Returns a 404
 * error if unknown
 * @param {Object} params
 * @param {string} [params.countryCode] - A two-letter ISO 3166-1 alpha-2 country
 * code
 * @param {Object} state
 * @returns {TextUnion | ErrorUnion}
 */
export declare type GetPreferredCountryLanguageMethod = <ResponseT = TextUnion>(params: GetPreferredCountryLanguageParams, state?: Record<string, any>) => Promise<ResponseT | ErrorUnion>;
export interface GetPreferredCountryLanguageParams {
    /** A two-letter ISO 3166-1 alpha-2 country code */
    countryCode?: string;
}