Dart APIunself_modelActivitycreated created property Null safety @JsonDateTime() DateTime created inherited Implementation @JsonDateTime() DateTime get created => throw _privateConstructorUsedError; unself_model unself_model Activity created property Activity class Constructors Activity fromJson Properties accountId appId archiveId copyWith created extra hashCode id labels name runtimeType source sourceId targetId timestamp type updated Methods noSuchMethod toJson toString Operators operator ==