export interface CalendarMessage {
    /** The title is shown close to the button that leads to open a user calendar. */
    title: string;
    /** The timestamp defines start of a calendar event. */
    event_start: Date;
    /** The timestamp defines end of a calendar event. */
    event_end: Date;
    /** Title of a calendar event. */
    event_title: string;
    /** Description of a calendar event. */
    event_description?: string;
    /** The URL that is opened when the user cannot open a calendar event directly or channel does not have support for this type. */
    fallback_url: string;
}