visibility property Null safety

1. baguette
2. CounterWidget
3. CounterWidget
4. visibility property

CounterWidget class

1. Constructors
2. CounterWidget
3. Properties
4. count
5. hashCode
6. height
7. key
8. margin
9. maxCount
10. minCount
11. onCount
12. padding
13. runtimeType
14. visibility
15. width
16. Methods
17. createElement
18. createState
19. debugDescribeChildren
20. debugFillProperties
21. noSuchMethod
22. toDiagnosticsNode
23. toString
24. toStringDeep
25. toStringShallow
26. toStringShort
27. Operators
28. operator ==