Code generation error when argument involves typedef List and a default value

[mernen]

Given this file:

typedef Strings = List<String>;

@RoutePage()
class TestPage extends StatelessWidget {
  const TestPage({
    super.key,
    this.strings = const [],
  });

  final Strings strings;

  @override
  Widget build(BuildContext context) => const Placeholder();
}

auto_route_generator fails to produce the routes file with an error like:

Full output

line 109, column 133 of .: Expected an identifier.
    ╷
109 │ class TestPageRoute extends _i47.PageRouteInfo<TestPageRouteArgs> {TestPageRoute({_i48.Key? key, _i46.Strings strings = const _i46. [], List<_i47.PageRouteInfo>? children, }) : super(TestPageRoute.name, args: TestPageRouteArgs(key: key, strings: strings, ), initialChildren: children, );
    │                                                                                                                                     ^^
    ╵
line 109, column 133 of .: Expected to find '('.
    ╷
109 │ class TestPageRoute extends _i47.PageRouteInfo<TestPageRouteArgs> {TestPageRoute({_i48.Key? key, _i46.Strings strings = const _i46. [], List<_i47.PageRouteInfo>? children, }) : super(TestPageRoute.name, args: TestPageRouteArgs(key: key, strings: strings, ), initialChildren: children, );
    │                                                                                                                                     ^^
    ╵
line 109, column 134 of .: Expected an identifier.
    ╷
109 │ class TestPageRoute extends _i47.PageRouteInfo<TestPageRouteArgs> {TestPageRoute({_i48.Key? key, _i46.Strings strings = const _i46. [], List<_i47.PageRouteInfo>? children, }) : super(TestPageRoute.name, args: TestPageRouteArgs(key: key, strings: strings, ), initialChildren: children, );
    │                                                                                                                                      ^
    ╵
line 117, column 88 of .: Expected an identifier.
    ╷
117 │ class TestPageRouteArgs {const TestPageRouteArgs({this.key, this.strings = const _i46. [], });
    │                                                                                        ^^
    ╵
line 117, column 88 of .: Expected to find '('.
    ╷
117 │ class TestPageRouteArgs {const TestPageRouteArgs({this.key, this.strings = const _i46. [], });
    │                                                                                        ^^
    ╵
line 117, column 89 of .: Expected an identifier.
    ╷
117 │ class TestPageRouteArgs {const TestPageRouteArgs({this.key, this.strings = const _i46. [], });
    │                                                                                         ^
    ╵

The most relevant part is that it tried to add a namespace to the array literal:

_i46.Strings strings = const _i46. []

It works fine if we write List<String> directly like this:

  final List<String> strings;

This is a regression from auto_route_generator v5, which handled typedefs well.

[mernen]

For comparison, auto_route_generator v5.0.2 produced simply const []. I don't know when exactly the regression was introduced.