OutlinedBorder constructor Null safety

1. flutter_json_widgets
2. shape_border
3. OutlinedBorder
4. OutlinedBorder constructor

OutlinedBorder class

1. Constructors
2. OutlinedBorder
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==