BlockMode constructor Null safety

1. baguette
2. BlockMode
3. BlockMode
4. BlockMode const constructor

BlockMode enum

1. Constructors
2. BlockMode
3. Values
4. None
5. Block
6. Properties
7. hashCode
8. index
9. runtimeType
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Constants
16. values