when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? type,
    2. Object? bytes,
    3. int? u64,
    4. String? reuse,
    5. String? metadata,
    6. CustomTransform? transform,
    )
)

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,  Object? bytes,  int? u64,  String? reuse,  String? metadata,  CustomTransform? transform)  $default,) {final _that = this;
switch (_that) {
case _CustomTransformArg():
return $default(_that.type,_that.bytes,_that.u64,_that.reuse,_that.metadata,_that.transform);case _:
  throw StateError('Unexpected subclass');

}
}