Dart APIunself_modelArchiveSchemaParttoJson toJson method Null safety Map<String, dynamic> toJson() inherited Implementation Map<String, dynamic> toJson() => throw _privateConstructorUsedError; unself_model unself_model ArchiveSchemaPart toJson method ArchiveSchemaPart class Constructors fromJson json zipJson Properties copyWith extra hashCode id part runtimeType schema Methods map mapOrNull maybeMap maybeWhen noSuchMethod read toJson toString when whenOrNull Operators operator ==