Dart APIunself_unpackUnpackServicestart start method Null safety @override Stream<int> start(List<Mapping> mappings ) override start let the service begins unpacking with the given Mapping , and returns a progress stream. Implementation @override Stream<int> start(List<Mapping> mappings) { throw UnimplementedError(); } unself_unpack unself_unpack UnpackService start method UnpackService class Constructors UnpackService Properties hashCode runtimeType unpacked Methods load noSuchMethod open start toString Operators operator ==