decode method Null safety

Implementation

static MediaMetadata decode(Object message) {
  final Map<Object?, Object?> pigeonMap = message as Map<Object?, Object?>;
  return MediaMetadata()
    ..mediaType = pigeonMap['mediaType'] != null
        ? MediaType.values[pigeonMap['mediaType']! as int]
        : null
    ..webImages = (pigeonMap['webImages'] as List<Object?>?)?.cast<WebImage?>();
}