1. Dart
2. dart:html
3. EventSource
4. onMessage property

##### EventSource class

1. Constructors
2. EventSource
3. Properties
4. hashCode
5. on
6. onError
7. onMessage
8. onOpen
9. readyState
10. runtimeType
11. url
12. withCredentials
13. Methods
14. addEventListener
15. close
16. dispatchEvent
17. noSuchMethod
18. removeEventListener
19. toString
20. Operators
21. operator ==
22. Constants
23. CLOSED
24. CONNECTING
25. errorEvent
26. messageEvent
27. OPEN
28. openEvent

description

# onMessage property Null safety

Stream<MessageEvent> onMessage

Stream of `message` events handled by this EventSource.

## Implementation

    Stream<MessageEvent> get onMessage => messageEvent.forTarget(this);