AsyncExtensions

The AsyncExtensions target is a growing collection of useful functions and classes that take advantage of Swift’s new Concurrency features.

The AsyncExtensions package also inlcudes the AsyncTestExtensions target, which contains async-friendly wrappers around XCTest assertions.

AsyncExtensions includes

• AsyncInputStream: A convenient wrapper around InputStream allowing for simple, type-safe access to stream data.
• AsyncOutputStream: A convenient wrapper around OutputStream allowing for simple, type-safe streaming of data.
• Publisher.allValues: Creates an AsyncStream from a Combine Publisher. It buffers all of the publisher’s output, ensuring the AsyncStream will produce everything the publisher publishes.
• Future: A thread-safe implemention of a future that is useful when briding traditional Swift code with code employing Swift Concurrency.
• Sequence.asyncMap() and Sequence.concurrentMap(): Extensions allowing for applying async transformations to Sequence.
• TaskStore: A thread-safe store for Task, which can help when migrating from Combine publishers to Swift Concurrency.
• TimeoutError: A simple error intending to represent a timeout. Modelled after CancellationError.

AsyncTestExtensions includes

• AssertEqual()
• AssertEqualEventually()
• AssertTrue()
• AssertTrueEventually()
• AssertFalse()
• AssertNil()
• AssertNotNil()
• AssertThrowsError()
• AssertNoThrow()

Installation

To use AsyncExtensions, add a dependency to your Package.swift file:

let package = Package(
  dependencies: [
    .package(
      url: "https://github.com/shareup/async-extensions.git",
      from: "4.0.0"
    )
  ]
)

To use AsyncTestExtensions in a test target, add it as a dependency:

.testTarget(
  name: "MyTests",
  dependencies: [
    .product(name: "AsyncTestExtensions", package: "async-extensions")
  ]
)

License

The license for AsyncExtensions is the standard MIT licence. You can find it in the LICENSE file.

SequenceExtensions were heavily inspired by CollectionConcurrencyKit by John Sundell at https://github.com/JohnSundell/CollectionConcurrencyKit.