1. Dart
2. dart:indexed_db
3. Observer
4. Observer factory constructor

Observer class

1. Constructors
2. Observer
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. observe
8. unobserve
9. noSuchMethod
10. toString
11. Operators
12. operator ==

factory Observer(ObserverCallback callback) {
  var callback_1 = convertDartClosureToJS(callback, 1);
  return Observer._create_1(callback_1);
}