when<TResult extends Object?>  method 
- @optionalTypeArgs
- TResult $default(- CardElementClasses? classes,
- dynamic style,
- String? value,
- bool? hidePostalCode,
- CardElementIconStyle? iconStyle,
- bool? hideIcon,
- bool? disabled,
 
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( CardElementClasses? classes,  dynamic style,  String? value,  bool? hidePostalCode,  CardElementIconStyle? iconStyle,  bool? hideIcon,  bool? disabled)  $default,) {final _that = this;
switch (_that) {
case _CardElementOptions():
return $default(_that.classes,_that.style,_that.value,_that.hidePostalCode,_that.iconStyle,_that.hideIcon,_that.disabled);case _:
  throw StateError('Unexpected subclass');
}
}