SingleSubscriptionTransformer<S, T> constructor Null safety

1. Flutter
2. async
3. SingleSubscriptionTransformer<S, T>
4. SingleSubscriptionTransformer const constructor

SingleSubscriptionTransformer class

1. Constructors
2. SingleSubscriptionTransformer
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. bind
8. cast
9. noSuchMethod
10. toString
11. Operators
12. operator ==