child property Null safety

1. flutter_json_widgets
2. widget
3. InteractiveViewer
4. child property

InteractiveViewer class

1. Constructors
2. InteractiveViewer
3. fromJson
4. Properties
5. alignment
6. boundaryMargin
7. child
8. clipBehavior
9. constrained
10. copyWith
11. hashCode
12. interactionEndFrictionCoefficient
13. key
14. maxScale
15. minScale
16. panAxis
17. panEnabled
18. runtimeType
19. scaleEnabled
20. scaleFactor
21. Methods
22. map
23. mapOrNull
24. maybeMap
25. maybeWhen
26. noSuchMethod
27. toJson
28. toString
29. when
30. whenOrNull
31. Operators
32. operator ==