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AnyAsyncSequence allows you to expose AsyncSequence interfaces in your APIs without exposing the underlying sequence type, while continuing to expose the sequence’s Element type to consumers, so they can asynchronously iterate over the sequence.

I assume that when Swift adds type constraints to opaque types (as has been hinted), this package may become unnecessary.


AnyAsyncSequence currently distributed exclusively through the Swift Package Manager.

To add AnyAsyncSequence as a dependency to an existing Swift package, add the following line of code to the dependencies parameter of your Package.swift file:

dependencies: [
    .package(url: "", .upToNextMajor(from: "1.0.0"))

To add AnyAsyncSequence as a dependency to an Xcode Project:

Other distribution mechanisms like CocoaPods or Carthage may be added in the future.

Additional installation instructions are available on the Swift Package Index


import AnyAsyncSequence

var mySequence: AnyAsyncSequence<Element> {

Explore the documentation for more details.


AnyAsyncSequence is available under the MIT license. See the LICENSE file for more information.