decode static method Null safety

Implementation

static TransitionOptions decode(Object message) {
  final Map<Object?, Object?> pigeonMap = message as Map<Object?, Object?>;
  return TransitionOptions(
    duration: pigeonMap['duration'] as int?,
    delay: pigeonMap['delay'] as int?,
    enablePlacementTransitions:
        pigeonMap['enablePlacementTransitions'] as bool?,
  );
}