Dart APIunself_modelArchiveSchematoJson toJson method Null safety Map<String, dynamic> toJson() inherited Implementation Map<String, dynamic> toJson() => throw _privateConstructorUsedError; unself_model unself_model ArchiveSchema toJson method ArchiveSchema class Constructors ArchiveSchema fromJson Properties appId constraint copyWith created extra hashCode id part runtimeType updated version Methods noSuchMethod read toJson toString Operators operator ==