key property Null safety

1. flutter_json_widgets
2. widget
3. SelectableText
4. key property

SelectableText class

1. Constructors
2. SelectableText
3. fromJson
4. Properties
5. autofocus
6. copyWith
7. cursorColor
8. cursorHeight
9. cursorRadius
10. cursorWidth
11. data
12. dragStartBehavior
13. enableInteractiveSelection
14. hashCode
15. key
16. maxLines
17. minLines
18. onTap
19. runtimeType
20. scrollPhysics
21. selectionHeightStyle
22. selectionWidthStyle
23. semanticsLabel
24. showCursor
25. strutStyle
26. style
27. textAlign
28. textDirection
29. textHeightBehavior
30. textScaleFactor
31. textWidthBasis
32. Methods
33. map
34. mapOrNull
35. maybeMap
36. maybeWhen
37. noSuchMethod
38. toJson
39. toString
40. when
41. whenOrNull
42. Operators
43. operator ==