toJson method Null safety

Map<String, dynamic> toJson()

Implementation

Map<String, dynamic> toJson() {
  final Map<String, dynamic> data = new Map<String, dynamic>();
  data["event"] = this.event;
  data["caller"] = this.caller;
  data["displayname"] = this.displayname;
  data["callee"] = this.callee;
  return data;
}