Dart APIunself_modelArchiveDataactivities activities property Null safety List<Activity> activities inherited Implementation List<Activity> get activities => throw _privateConstructorUsedError; unself_model unself_model ArchiveData activities property ArchiveData class Constructors ArchiveData fromJson Properties accounts activities apps archiveId copyWith extra hashCode id runtimeType topics Methods noSuchMethod toJson toString Operators operator == Constants fieldMap