Exception on method when name is "registered"

[zoechi]

I'm not sure if this is a Polymer or Reflectable issue.

When an event handler is named registered

@PolymerRegister('some-element')
class SomeElement extends PolymerElement {
  SomeElement.created() : super.created();

  @reflectable
  void registered(dom.CustomEvent event, [_]) {...}
  // any other name than registered works just fine
}

See also http://stackoverflow.com/questions/33342798/how-do-you-listen-for-custom-events-in-polymer-dart-1-0/33342934#33342798

Observatory listening at http://127.0.0.1:46104/
Exception: Uncaught Error: Unhandled exception:
Reflecting on un-marked type 'JsObjectImpl'

0 _InstanceMirrorImpl._InstanceMirrorImpl (package:reflectable/src/reflectable_transformer_based.dart:150:9)

1 ReflectableImpl.reflect (package:reflectable/src/reflectable_transformer_based.dart:1216:16)

2 _setupReflectableMethods.. (package:polymer/src/common/polymer_descriptor.dart:151:49)

3 JsObject._callMethod (dart:js:678)

4 JsObject.callMethod (dart:js:618)

5 PolymerRegister.initialize (package:polymer/src/common/polymer_register.dart:19:13)

6 loadInitializers.. (package:initialize/src/static_loader.dart:46:32)

7 _runInitQueue (package:initialize/initialize.dart:35:24)

8 _runInitQueue. (package:initialize/initialize.dart:38:26)

9 _RootZone.runUnary (dart:async/zone.dart:1165)

10 _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:502)

11 _Future._propagateToListeners (dart:async/future_impl.dart:585)

12 _Future._completeWithValue (dart:async/future_impl.dart:376)

13 _Future._asyncComplete. (dart:async/future_impl.dart:430)

14 _microtaskLoop (dart:async/schedule_microtask.dart:43)

15 _microtaskLoopEntry (dart:async/schedule_microtask.dart:52)

16 _ScheduleImmediateHelper._handleMutation (dart:html:42565)

Stack Trace:

0 JsObject._callMethod (dart:js:678)

1 JsObject.callMethod (dart:js:618)

2 PolymerRegister.initialize (package:polymer/src/common/polymer_register.dart:19:13)

3 loadInitializers.. (package:initialize/src/static_loader.dart:46:32)

4 _runInitQueue (package:initialize/initialize.dart:35:24)

5 _runInitQueue. (package:initialize/initialize.dart:38:26)

6 _RootZone.runUnary (dart:async/zone.dart:1165)

7 _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:502)

8 _Future._propagateToListeners (dart:async/future_impl.dart:585)

9 _Future._completeWithValue (dart:async/future_impl.dart:376)

10 _Future._asyncComplete. (dart:async/future_impl.dart:430)

11 _microtaskLoop (dart:async/schedule_microtask.dart:43)

12 _microtaskLoopEntry (dart:async/schedule_microtask.dart:52)

13 _ScheduleImmediateHelper._handleMutation (dart:html:42565)

[sigurdm]

I agree this looks suspicious. But I don't think reflectable is doing anything different with a member named "registered".

I downloaded github.com/terrasea/gcanvas and tried the web/main out in dartium - I can reproduce the app making this stack-trace when the method is named "registered" and not if named "registered2".

I tried to add formatted: true in the pubspec.yaml:transformers:reflectable section, and then running
pub build --mode=debug with the name as "registered" and "registered2" and the only difference I see in the file that reflectable generated (build/main.dart) was the name of the field.

That makes me believe the error is not related to reflectable. Does the name "registered" have any special meaning in polymer.js?

(/cc @jakemac53) any ideas?

[jakemac53]

This is definitely a Polymer issue, Polymer JS treats a function named registered in a special way that breaks things.