Dart APIunself_unpackExportopen open abstract method Null safety FutureOr<List<String>> open(Map<String, Object?> object ) open returns the supported list of identifier String for the given object. Implementation FutureOr<List<String>> open(Map<String, Object?> object); unself_unpack unself_unpack Export<T, O> open abstract method Export class Constructors Export Properties hashCode runtimeType Methods noSuchMethod open pack toString Operators operator ==