StyleableFileSystem constructor Null safety

1. Flutter
2. memory
3. StyleableFileSystem
4. StyleableFileSystem constructor

StyleableFileSystem class

1. Constructors
2. StyleableFileSystem
3. Properties
4. currentDirectory
5. hashCode
6. isWatchSupported
7. path
8. runtimeType
9. style
10. systemTempDirectory
11. Methods
12. directory
13. file
14. getPath
15. identical
16. identicalSync
17. isDirectory
18. isDirectorySync
19. isFile
20. isFileSync
21. isLink
22. isLinkSync
23. link
24. noSuchMethod
25. stat
26. statSync
27. toString
28. type
29. typeSync
30. Operators
31. operator ==