Static extension methods defined in an extension on Enum do not get added to ClassMirror.staticMembers.

[akasher]

enum Roles{
owner,
admin,
user}

extension RolesParser on Roles{
static Roles parse(String value) {
    final Roles role = tryParse(value);
    if (role != null)
      return role;
  }
  static Roles tryParse(String input) {
    final String value = input.trim();
    return Roles.values.firstWhere((element) => element.toString().split('.')[1].toUpperCase() == value.toUpperCase());
  }
}

[leafpetersen]

If I understand the request correctly, you are asking to be able to introspect on the set of extensions which extend a given enum using the ClassMirror for the enum? I think this is probably working as intended. Extensions aren't really attached to the class they extend, and it feels surprising to me that someone in some completely unrelated library adding an extension would change the entries of a ClassMirror.

But @rmacnak-google would probably be the right person to comment here.

[lrhn]

There are two issues here.

First of all, the attempt to add static members to a class using static extensions. That simply does not work in the current Dart. There is no difference between the extension written here and a class RolesParser containing the same static methods. They can still only be called using RolesParser.tryParse/RolesParser.parse, not as Roles.tryParse or Roles.parse.

Second, extensions do not show up in reflection on the target class. There is nothing inherently preventing that, but I do not believe that there is currently any easy way to access extension methods using mirrors. Extension methods are desugared into top-level functions, in this case named RolesParser.tryParse and RolesParser.parse (which are otherwise not valid declaration names), and you can find them using dart:mirrors using LibraryMirror.declarations (and you probably shouldn't be able to find them that way).

The former issue is a language issue, the latter is a library issue and belongs in the SDK repository.

[lrhn]

Closing this for #723 and dart-lang/sdk#43086.