when<TResult extends Object?>  method 
- @optionalTypeArgs
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 code,  int available,  bool disabled,  String forAccount,  String createdBy,  DateTime createdAt, @InviteCodeUseConverter()  List<InviteCodeUse> uses,  Map<String, dynamic>? $unknown)  $default,) {final _that = this;
switch (_that) {
case _InviteCode():
return $default(_that.$type,_that.code,_that.available,_that.disabled,_that.forAccount,_that.createdBy,_that.createdAt,_that.uses,_that.$unknown);case _:
  throw StateError('Unexpected subclass');
}
}