/**
 * Provides information about the method by which an authentication code is delivered
 * to the user
 */
export declare type AuthenticationCodeTypeUnion = AuthenticationCodeTypeTelegramMessage | AuthenticationCodeTypeSms | AuthenticationCodeTypeCall | AuthenticationCodeTypeFlashCall;
/**
 * An authentication code is delivered via a private Telegram message, which can be
 * viewed in another client
 */
export interface AuthenticationCodeTypeTelegramMessage {
    _: 'authenticationCodeTypeTelegramMessage';
    /** Length of the code */
    length: number;
}
/** An authentication code is delivered via an SMS message to the specified phone number */
export interface AuthenticationCodeTypeSms {
    _: 'authenticationCodeTypeSms';
    /** Length of the code */
    length: number;
}
/** An authentication code is delivered via a phone call to the specified phone number */
export interface AuthenticationCodeTypeCall {
    _: 'authenticationCodeTypeCall';
    /** Length of the code */
    length: number;
}
/**
 * An authentication code is delivered by an immediately cancelled call to the specified
 * phone number. The number from which the call was made is the code
 */
export interface AuthenticationCodeTypeFlashCall {
    _: 'authenticationCodeTypeFlashCall';
    /** Pattern of the phone number from which the call will be made */
    pattern: string;
}