/** Contains information about the origin of a forwarded message */
export declare type MessageForwardOriginUnion = MessageForwardOriginUser | MessageForwardOriginHiddenUser | MessageForwardOriginChannel;
/** The message was originally written by a known user */
export interface MessageForwardOriginUser {
    _: 'messageForwardOriginUser';
    /** Identifier of the user that originally sent the message */
    senderUserId: number;
}
/** The message was originally written by a user, which is hidden by his privacy settings */
export interface MessageForwardOriginHiddenUser {
    _: 'messageForwardOriginHiddenUser';
    /** Name of the sender */
    senderName: string;
}
/** The message was originally a post in a channel */
export interface MessageForwardOriginChannel {
    _: 'messageForwardOriginChannel';
    /** Identifier of the chat from which the message was originally forwarded */
    chatId: number;
    /** Message identifier of the original message; 0 if unknown */
    messageId: number;
    /** Original post author signature */
    authorSignature: string;
}