onTap property Null safety

1. flutter_json_widgets
2. widget
3. TextFormField
4. onTap property

TextFormField class

1. Constructors
2. TextFormField
3. fromJson
4. Properties
5. autocorrect
6. autofillHints
7. autofocus
8. autovalidateMode
9. copyWith
10. cursorColor
11. cursorHeight
12. cursorRadius
13. cursorWidth
14. decoration
15. enabled
16. enableIMEPersonalizedLearning
17. enableInteractiveSelection
18. enableSuggestions
19. expands
20. field
21. hashCode
22. initialValue
23. inputFormatters
24. key
25. keyboardAppearance
26. keyboardType
27. maxLength
28. maxLengthEnforcement
29. maxLines
30. minLines
31. mouseCursor
32. obscureText
33. obscuringCharacter
34. onEditingComplete
35. onTap
36. readOnly
37. restorationId
38. runtimeType
39. scrollPadding
40. scrollPhysics
41. showCursor
42. smartDashesType
43. smartQuotesType
44. strutStyle
45. style
46. textAlign
47. textAlignVertical
48. textCapitalization
49. textDirection
50. textInputAction
51. validatorMessages
52. Methods
53. map
54. mapOrNull
55. maybeMap
56. maybeWhen
57. noSuchMethod
58. toJson
59. toString
60. when
61. whenOrNull
62. Operators
63. operator ==