asyncMapSample transform.<void> generic type rather than an implicit dynamic>onError callback in tap.combine callback to return a FutureOr<T> in scan. There are no behavior changes for synchronous callbacks. Potential breaking change In the unlikely situation where scan was used to produce a Stream<Future> inference may now fail and require explicit generic type arguments.combineLatest.combineLatestAll.whereType.asyncWhere will now forward exceptions thrown by the callback through the result Stream.concurrentAsyncMap.mergeAll now accepts an Iterable<Stream> instead of only List<Stream>.chainTransformers and map for use cases where StreamTransformer instances are stored as variables or passed to methods other than transform.concat as followedBy to match the naming of Iterable.followedBy. concat is now deprecated.Updates to support Dart 2.0 core library changes (wave 2.2). See issue 31847 for details.
asyncMapBuffer.takeUntil.scan and switchMap now correctly report isBroadcast.startWith, startWithMany, and startWithStream.throttle, debounce, asyncWhere and audit.tap data callback once per event rather than once per listener.merge transform.StreamControllers for forwarding where possible.asyncWhere: Like where but allows an asynchronous predicate.scan: fold which returns intermediate valuesthrottle: block events for a duration after emitting a valueaudit: emits the last event received after a durationtap: React to values as they pass without being a subscriber on a streamswitchMap and switchLatest: Flatten a Stream of Streams into a Stream which forwards values from the most recent Streamconcat: Appends streams in seriesmerge and mergeAll: Interleaves streamsbuffer: Collects events in a List until a trigger stream fires.debounce, debounceBuffer: Collect or drop events which occur closer in time than a given duration.