Dart APIunself_modelValueFromValueFrom.fromJson factory constructor ValueFrom.fromJson constructor Null safety ValueFrom.fromJson(Map<String, dynamic> json ) Implementation factory ValueFrom.fromJson(Map<String, dynamic> json) = _$ValueFrom.fromJson; unself_model unself_model ValueFrom ValueFrom.fromJson factory constructor ValueFrom class Constructors ValueFrom fromJson Properties copyWith hashCode name runtimeType Methods map mapOrNull maybeMap maybeWhen noSuchMethod toJson toString when whenOrNull Operators operator ==