encode method Null safety

Implementation

Object encode() {
  final Map<Object?, Object?> pigeonMap = <Object?, Object?>{};
  pigeonMap['center'] = center;
  pigeonMap['padding'] = padding?.encode();
  pigeonMap['anchor'] = anchor?.encode();
  pigeonMap['zoom'] = zoom;
  pigeonMap['bearing'] = bearing;
  pigeonMap['pitch'] = pitch;
  return pigeonMap;
}