return a list of object with hive stream

**Question**
I have an interface for my repository which returns ```Stream>>```. I am don't know how to do that using ```watch()``` method.

**Code sample**
```dart
final Box notebookBox = Hive.box(Documents.notebook);

Stream>> getNotebooks() async* {
notebookBox
.watch()
.map(
(boxEvent) => right>(boxEvent.value),
)
.onErrorReturnWith(
(error) => left(const NotebookFailure.unexpected()),
);
}
```

The error is **The argument type 'dynamic' can't be assigned to the parameter type 'List'.**

**Version**
- Platform: iOS, Android
- Flutter version: 1.22.0
- Hive version: version: "1.4.4+1"
- Hive_Flutter: version: "0.3.1"