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 ==

# Observer constructor

Observer(ObserverCallback callback)

## Implementation

    factory Observer(ObserverCallback callback) {
      return Observer._create_1(callback);
    }