d3.dart 0.2.0 - method not found: '_proxy' - d3.js

Question

I am starting to use a dart API for d3.js (found here: https://pub.dartlang.org/packages/d3) and I came across a problem, when I tried to create a Axis using TimeScale.
Console:
oSuchMethodError: method not found: '_proxy'
Receiver: Instance of 'TimeScale'
Arguments: []
timeline.dart code
x = new time.TimeScale()
..range([0, width])
..domain([new DateTime(1999, 0, 1), new DateTime(2014, 0, 0)]);
x = new svg.Axis()
..scale(x);
Log:
#0 Object._noSuchMethod (dart:core-patch/object_patch.dart:44)
#1 Object.noSuchMethod (dart:core-patch/object_patch.dart:47)
#2 getProxy (package:d3/src/js/scale.dart:679:31)
#3 Axis.scale (package:d3/src/js/svg.dart:867:16)
#4 Timeline.attached (http://localhost:20080/frontend/dart/components/timeline.dart:29:9)
#5 Application.init.<init_async_body>.<anonymous closure> (http://localhost:20080/frontend/dart/application/application.dart:128:25)
#6 _HashVMBase&MapMixin&&_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:351)
#7 Application.init.<init_async_body> (http://localhost:20080/frontend/dart/application/application.dart:105:37)
#8 Future.Future.microtask.<anonymous closure> (dart:async/future.dart:144)
#9 _microtaskLoop (dart:async/schedule_microtask.dart:41)
#10 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50)
#11 _ScheduleImmediateHelper._handleMutation (dart:html:49308)
[[class]]: _StackTrace(anonymous function) # VM2334:1
VM2334:1 Uncaught Unhandled exception:
Closure call with mismatched arguments: function '_proxy'
NoSuchMethodError: method not found: '_proxy'
Receiver: Instance of 'TimeScale'
Arguments: []
#0 Application.init.<init_async_body>.<anonymous closure> (http://localhost:20080/frontend/dart/application/application.dart:131:21)
#1 _HashVMBase&MapMixin&&_LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:351)
#2 Application.init.<init_async_body> (http://localhost:20080/frontend/dart/application/application.dart:105:37)
#3 Future.Future.microtask.<anonymous closure> (dart:async/future.dart:144)
#4 _microtaskLoop (dart:async/schedule_microtask.dart:41)
#5 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50)
#6 _ScheduleImmediateHelper._handleMutation (dart:html:49308)(anonymous function) # VM2334:1
d3/src/js/scale.dart - line 679
JsObject getProxy(arg) => arg._proxy;
d3/src/js/svg.dart
scale([scale = undefined]) {
var args = [];
if (scale != undefined) {
//line 867
args.add(sc.getProxy(scale));
}
var retval = _proxy.callMethod('scale', args);
if (scale == undefined) {
return retval; // TODO: wrap in Scale
} else {
return new Axis._(retval);
}
}
Did anyone know what's wrong ?
Thanks

Answer 1

Looking at the package code, you will only be able to give a scale parameter that belong to d3/src/js/scale.dart library.
Using a private member like in arg._proxy will retrieve the _proxy attribute only for arg inside the same library (that's what the prepending _ means : private to its library).
Unfortunately I don't see any simple solution to workaround your issue with the current package sources.