TEMPORARY constant Null safety

1. Flutter
2. dart:html
3. SharedWorkerGlobalScope
4. TEMPORARY constant

SharedWorkerGlobalScope class

1. Properties
2. addressSpace
3. caches
4. crypto
5. hashCode
6. indexedDB
7. isSecureContext
8. location
9. name
10. navigator
11. on
12. onConnect
13. onError
14. origin
15. performance
16. runtimeType
17. self
18. Methods
19. addEventListener
20. atob
21. btoa
22. close
23. dispatchEvent
24. fetch
25. importScripts
26. noSuchMethod
27. removeEventListener
28. requestFileSystemSync
29. resolveLocalFileSystemSyncUrl
30. toString
31. Operators
32. operator ==
33. Static properties
34. instance
35. Constants
36. connectEvent
37. PERSISTENT
38. TEMPORARY