1. Dart
2. dart:web_audio
3. AudioNode
4. numberOfOutputs property

AudioNode class

1. Properties
2. channelCount
3. channelCountMode
4. channelInterpretation
5. context
6. numberOfInputs
7. numberOfOutputs
8. hashCode
9. on
10. runtimeType
11. Methods
12. connectNode
13. connectParam
14. disconnect
15. addEventListener
16. dispatchEvent
17. noSuchMethod
18. removeEventListener
19. toString
20. Operators
21. operator ==

int get numberOfOutputs native;