encode method Null safety

Implementation

Object encode() {
  final Map<Object?, Object?> pigeonMap = <Object?, Object?>{};
  pigeonMap['playerState'] = playerState?.index;
  pigeonMap['isPlayingAd'] = isPlayingAd;
  pigeonMap['mediaInfo'] = mediaInfo?.encode();
  pigeonMap['adBreakStatus'] = adBreakStatus?.encode();
  return pigeonMap;
}