Dart APIunself_modelEntitydefinition definition property Null safety @override Map<String, IJsonSchema> definition Implementation @override Map<String, IJsonSchema> get definition; unself_model unself_model Entity definition property Entity class Constructors Entity fromJson Properties copyWith definition extra fieldMap hashCode key name runtimeType Methods map mapOrNull maybeMap maybeWhen noSuchMethod toJson toString when whenOrNull Operators operator ==