pub trait ServiceWorkerGlobalScopeMethods<D>where
    D: DomTypes,{
    // Required methods
    fn GetOnmessage(&self) -> Option<Rc<EventHandlerNonNull<D>>>;
    fn SetOnmessage(&self, value: Option<Rc<EventHandlerNonNull<D>>>);
    fn GetOnmessageerror(&self) -> Option<Rc<EventHandlerNonNull<D>>>;
    fn SetOnmessageerror(&self, value: Option<Rc<EventHandlerNonNull<D>>>);
}