EventTransformer<Event>  typedef 
 
        EventTransformer<Event> =
     Stream<Event>  Function(Stream<Event>  events, EventMapper<Event>  mapper)
     
    
Used to change how events are processed. By default events are processed concurrently.
Implementation
typedef EventTransformer<Event> = Stream<Event> Function(
  Stream<Event> events,
  EventMapper<Event> mapper,
);