# listenTo method Null safety

1. @override

StreamSubscription<DecoratedContentModel?> listenTo(

1. String documentId,
2. DecoratedContentChanged changed,
3. {DecoratedContentErrorHandler? errorHandler}

)
override

## Implementation

    @override
    StreamSubscription<DecoratedContentModel?> listenTo(
        String documentId, DecoratedContentChanged changed,
        {DecoratedContentErrorHandler? errorHandler});