pub type OnErrorEventHandler<D> = Option<Rc<OnErrorEventHandlerNonNull<D>>>;Aliased Type§
pub enum OnErrorEventHandler<D> {
    None,
    Some(Rc<OnErrorEventHandlerNonNull<D>>),
}pub type OnErrorEventHandler<D> = Option<Rc<OnErrorEventHandlerNonNull<D>>>;pub enum OnErrorEventHandler<D> {
    None,
    Some(Rc<OnErrorEventHandlerNonNull<D>>),
}