toJson method Null safety

Implementation

Map<String, dynamic> toJson() {
  final Map<String, dynamic> data = new Map<String, dynamic>();
  data['path'] = this.path;
  data['id'] = this.id;
  data['loopCount'] = this.loopCount;
  data['publish'] = this.publish;
  data['isShortFile'] = this.isShortFile;
  data['startTimeMS'] = this.startTimeMS;
  data['endTimeMS'] = this.endTimeMS;
  return data;
}