class SkillTreeEdge { final String id; final String from; final String to; final String arrows; SkillTreeEdge({ required this.id, required this.from, required this.to, required this.arrows, }); // Optionally, add a factory constructor to initialize from JSON factory SkillTreeEdge.fromJson(Map json) { return SkillTreeEdge( id: json['id'], from: json['from'], to: json['to'], arrows: json['arrows'], ); } }