index.dart

library index;

import 'package:reflectable/reflectable.dart';

class MyReflectable extends Reflectable {
  const MyReflectable() : super(instanceInvokeCapability);
}
const myReflectable = const MyReflectable();

@myReflectable
class MyClass {
  String get $ => 'hello';
}

main() {
  var instance = new MyClass();
  var mirror = myReflectable.reflect(instance);
  print(mirror.invokeGetter(r'$'));
}

log.txt

Building playground... (6.1s) 
[Info from Dart2JS]:
Compiling playground|web/reflectable/index.dart...
[Error from Dart2JS on playground|web/reflectable/index.dart]:
web/reflectable/index_reflection_data.dart:14:223:
A '$' has special meaning inside a string, and must be followed by an identifier or an expression in curly braces ({}).
Try adding a backslash (\) to escape the '$'.
  r.data = {const prefix0.MyReflectable(): new r.ReflectorData([new r.ClassMirrorImpl("MyClass", "index.MyClass", 0, const prefix0.MyReflectable(), [0], [1, 2, 3, 4, 5, 0], -1, {}, {}, {}, null)], [new r.MethodMirrorImpl("$", 3, 0, const prefix0.MyReflectable(), null), new r.MethodMirrorImpl("==", 2, null, const prefix0.MyReflectable(), null), new r.MethodMirrorImpl("toString", 2, null, const prefix0.MyReflectable(), null), new r.MethodMirrorImpl("noSuchMethod", 2, null, const prefix0.MyReflectable(), null), new r.MethodMirrorImpl("hashCode", 3, null, const prefix0.MyReflectable(), null), new r.MethodMirrorImpl("runtimeType", 3, null, const prefix0.MyReflectable(), null)], [prefix0.MyClass], {"==": (dynamic instance) => (x) => instance == x, "toString": (dynamic instance) => instance.toString, "noSuchMethod": (dynamic instance) => instance.noSuchMethod, "hashCode": (dynamic instance) => instance.hashCode, "runtimeType": (dynamic instance) => instance.runtimeType, "$": (dynamic instance) => instance.$}, {})};

pubspec.yaml

name: repro
dependencies:
  reflectable:
    path: ../reflectable/reflectable
transformers:
- reflectable:
    entry_points:
      - web/index.dart
- $dart2js:
    $include:
      - web/index.dart