Contains utility classes in the style ofdart:async to work with asynchronouscomputations.

Package API#

• TheAsyncCache class allows expensive asynchronouscomputations values to be cached for a period of time.

• TheAsyncMemoizer class makes it easy to only run anasynchronous operation once on demand.

• TheCancelableOperation class defines an operationthat can be canceled by its consumer. The producer can then listen for thiscancellation and stop producing the future when it's received. It can becreated using aCancelableCompleter.

• The delegating wrapper classes allow users to easily add functionality on topof existing instances of core types fromdart:async. These includeDelegatingFuture,DelegatingStream,DelegatingStreamSubscription,DelegatingStreamConsumer,DelegatingSink,DelegatingEventSink, andDelegatingStreamSink.

• TheFutureGroup class makes it easy to wait until a group offutures that may change over time completes.

• TheLazyStream class allows a stream to be initialized lazilywhen.listen() is first called.

• TheNullStreamSink class is an implementation ofStreamSink that discards all events.

• TheRestartableTimer class extendsTimer with areset() method.

• TheResult class that can hold either a value or an error. Itprovides various utilities for converting to and fromFutures andStreams.

• TheStreamGroup class merges a collection of streams into asingle output stream.

• TheStreamQueue class allows a stream to be consumedevent-by-event rather than being pushed whichever events as soon as theyarrive.

• TheStreamSplitter class allows a stream to be duplicatedinto multiple identical streams.

• TheStreamZip class combines multiple streams into a singlestream of lists of events.

• This package contains a number ofStreamTransformers.SingleSubscriptionTransformer converts abroadcast stream to a single-subscription stream, andtypedStreamTransformer casts the type of aStream. It also defines a transformer type forStreamSinks,StreamSinkTransformer.

• TheSubscriptionStream class wraps aStreamSubscription so it can be re-used as aStream.

Publishing automation#

For information about our publishing automation and release process, seehttps://github.com/dart-lang/ecosystem/wiki/Publishing-automation.