CollectionType constructor Null safety

const CollectionType()

1. unself_model
2. unself_model
3. CollectionType
4. CollectionType const constructor

CollectionType enum

1. Constructors
2. CollectionType
3. Values
4. node
5. edge
6. Properties
7. hashCode
8. index
9. runtimeType
10. Methods
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Constants
16. values