toMap method Null safety

Implementation

@override
Map<String, Object?> toMap() {
  return {
    'distance': this.distance,
    'duration': this.duration,
    'points': this.points?.map((e) => e.toMap()).toList(),
    'pointsCount': this.pointsCount,
    'name': this.name,
    'direction': this.direction,
    'entrace': this.entrace?.toMap(),
    'entraceInstruction': this.entraceInstruction,
    'exit': this.exit?.toMap(),
    'exitInstruction': this.exitInstruction,
    'instruction': this.instruction,
    'turnType': this.turnType,
  };
}