when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String $type,
    2. String id,
    3. String rev,
    4. String text,
    5. List<RichtextFacet>? facets,
    6. UMessageViewEmbed? embed,
    7. List<ReactionView>? reactions,
    8. MessageViewSender sender,
    9. DateTime sentAt,
    10. Map<String, dynamic>? $unknown,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( String $type,  String id,  String rev,  String text, @RichtextFacetConverter()  List<RichtextFacet>? facets, @UMessageViewEmbedConverter()  UMessageViewEmbed? embed, @ReactionViewConverter()  List<ReactionView>? reactions, @MessageViewSenderConverter()  MessageViewSender sender,  DateTime sentAt,  Map<String, dynamic>? $unknown)  $default,) {final _that = this;
switch (_that) {
case _MessageView():
return $default(_that.$type,_that.id,_that.rev,_that.text,_that.facets,_that.embed,_that.reactions,_that.sender,_that.sentAt,_that.$unknown);case _:
  throw StateError('Unexpected subclass');

}
}