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