CustomStream<T extends Event> constructor Null safety

1. Dart
2. dart:html
3. CustomStream<T extends Event>
4. CustomStream constructor

CustomStream class

1. Constructors
2. CustomStream
3. Properties
4. first
5. hashCode
6. isBroadcast
7. isEmpty
8. last
9. length
10. runtimeType
11. single
12. Methods
13. add
14. any
15. asBroadcastStream
16. asyncExpand
17. asyncMap
18. cast
19. contains
20. distinct
21. drain
22. elementAt
23. every
24. expand
25. firstWhere
26. fold
27. forEach
28. handleError
29. join
30. lastWhere
31. listen
32. map
33. noSuchMethod
34. pipe
35. reduce
36. singleWhere
37. skip
38. skipWhile
39. take
40. takeWhile
41. timeout
42. toList
43. toSet
44. toString
45. transform
46. where
47. Operators
48. operator ==