maybeWhen<TResult extends Object?>  method 
- @optionalTypeArgs
- TResult $default(- String $type,
- AtUri uri,
- ProfileView subject,
- Map<String, dynamic> ? $unknown,
 
- required TResult orElse(),
A variant of when that fallback to an orElse callback.
It is equivalent to doing:
switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return orElse();
}
Implementation
@optionalTypeArgs TResult maybeWhen<TResult extends Object?>(TResult Function( String $type, @AtUriConverter()  AtUri uri, @ProfileViewConverter()  ProfileView subject,  Map<String, dynamic>? $unknown)?  $default,{required TResult orElse(),}) {final _that = this;
switch (_that) {
case _ListItemView() when $default != null:
return $default(_that.$type,_that.uri,_that.subject,_that.$unknown);case _:
  return orElse();
}
}