/**
 * Marks the function as start function of the bot.
 * The function will be executed when user sends a `/start` command.
 *
 * @export
 * @returns Method Decorator
 */
export declare function start(): <T extends Func<any, any[]> = Func<any, any[]>>(target: any, propName: string, descriptor?: TypedPropertyDescriptor<T> | undefined) => TypedPropertyDescriptor<T> | undefined;