Enable upcoming feature ExistentialAny

Examples/Packages/CrossPlatform/Package.swift

@@ -3,6 +3,9 @@
 import PackageDescription
 
 let atoms = Target.Dependency.product(name: "Atoms", package: "swiftui-atom-properties")
+let swiftSettings: [SwiftSetting] = [
+    .enableUpcomingFeature("ExistentialAny")
+]
 
 let package = Package(
     name: "CrossPlatformExamples",
@@ -25,11 +28,12 @@ let package = Package(
                 atoms,
                 "ExampleCounter",
                 "ExampleTodo",
-            ]
+            ],
+            swiftSettings: swiftSettings
         ),
-        .target(name: "ExampleCounter", dependencies: [atoms]),
-        .testTarget(name: "ExampleCounterTests", dependencies: ["ExampleCounter"]),
-        .target(name: "ExampleTodo", dependencies: [atoms]),
-        .testTarget(name: "ExampleTodoTests", dependencies: ["ExampleTodo"]),
+        .target(name: "ExampleCounter", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleCounterTests", dependencies: ["ExampleCounter"], swiftSettings: swiftSettings),
+        .target(name: "ExampleTodo", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleTodoTests", dependencies: ["ExampleTodo"], swiftSettings: swiftSettings),
     ]
 )

Examples/Packages/iOS/Package.swift

@@ -3,6 +3,9 @@
 import PackageDescription
 
 let atoms = Target.Dependency.product(name: "Atoms", package: "swiftui-atom-properties")
+let swiftSettings: [SwiftSetting] = [
+    .enableUpcomingFeature("ExistentialAny")
+]
 
 let package = Package(
     name: "iOSExamples",
@@ -26,15 +29,16 @@ let package = Package(
                 "ExampleMap",
                 "ExampleVoiceMemo",
                 "ExampleTimeTravel",
-            ]
+            ],
+            swiftSettings: swiftSettings
         ),
-        .target(name: "ExampleMovieDB", dependencies: [atoms]),
-        .testTarget(name: "ExampleMovieDBTests", dependencies: ["ExampleMovieDB"]),
-        .target(name: "ExampleMap", dependencies: [atoms]),
-        .testTarget(name: "ExampleMapTests", dependencies: ["ExampleMap"]),
-        .target(name: "ExampleVoiceMemo", dependencies: [atoms]),
-        .testTarget(name: "ExampleVoiceMemoTests", dependencies: ["ExampleVoiceMemo"]),
-        .target(name: "ExampleTimeTravel", dependencies: [atoms]),
-        .testTarget(name: "ExampleTimeTravelTests", dependencies: ["ExampleTimeTravel"]),
+        .target(name: "ExampleMovieDB", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleMovieDBTests", dependencies: ["ExampleMovieDB"], swiftSettings: swiftSettings),
+        .target(name: "ExampleMap", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleMapTests", dependencies: ["ExampleMap"], swiftSettings: swiftSettings),
+        .target(name: "ExampleVoiceMemo", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleVoiceMemoTests", dependencies: ["ExampleVoiceMemo"], swiftSettings: swiftSettings),
+        .target(name: "ExampleTimeTravel", dependencies: [atoms], swiftSettings: swiftSettings),
+        .testTarget(name: "ExampleTimeTravelTests", dependencies: ["ExampleTimeTravel"], swiftSettings: swiftSettings),
     ]
 )

Examples/Packages/iOS/Sources/ExampleMap/Atoms.swift

@@ -2,13 +2,13 @@ import Atoms
 import CoreLocation
 
 final class LocationObserver: NSObject, ObservableObject, CLLocationManagerDelegate, @unchecked Sendable {
-    let manager: LocationManagerProtocol
+    let manager: any LocationManagerProtocol
 
     deinit {
         manager.stopUpdatingLocation()
     }
 
-    init(manager: LocationManagerProtocol) {
+    init(manager: any LocationManagerProtocol) {
         self.manager = manager
         super.init()
         manager.delegate = self
@@ -32,13 +32,13 @@ final class LocationObserver: NSObject, ObservableObject, CLLocationManagerDeleg
         }
     }
 
-    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
+    func locationManager(_ manager: CLLocationManager, didFailWithError error: any Error) {
         print(error.localizedDescription)
     }
 }
 
 struct LocationManagerAtom: ValueAtom, Hashable {
-    func value(context: Context) -> LocationManagerProtocol {
+    func value(context: Context) -> any LocationManagerProtocol {
         let manager = CLLocationManager()
         manager.desiredAccuracy = kCLLocationAccuracyBest
         return manager

Examples/Packages/iOS/Sources/ExampleMap/Dependency/LocationManager.swift

@@ -1,7 +1,7 @@
 import CoreLocation
 
 protocol LocationManagerProtocol: AnyObject {
-    var delegate: CLLocationManagerDelegate? { get set }
+    var delegate: (any CLLocationManagerDelegate)? { get set }
     var desiredAccuracy: CLLocationAccuracy { get set }
     var location: CLLocation? { get }
     var authorizationStatus: CLAuthorizationStatus { get }
@@ -12,7 +12,7 @@ protocol LocationManagerProtocol: AnyObject {
 extension CLLocationManager: LocationManagerProtocol {}
 
 final class MockLocationManager: LocationManagerProtocol, @unchecked Sendable {
-    weak var delegate: CLLocationManagerDelegate?
+    weak var delegate: (any CLLocationManagerDelegate)?
     var desiredAccuracy = kCLLocationAccuracyKilometer
     var location: CLLocation? = nil
     var authorizationStatus = CLAuthorizationStatus.notDetermined

Examples/Packages/iOS/Sources/ExampleMovieDB/Atoms/CommonAtoms.swift

@@ -2,7 +2,7 @@ import Atoms
 import UIKit
 
 struct APIClientAtom: ValueAtom, Hashable {
-    func value(context: Context) -> APIClientProtocol {
+    func value(context: Context) -> any APIClientProtocol {
         APIClient()
     }
 }

Examples/Packages/iOS/Sources/ExampleMovieDB/Atoms/MoviesAtoms.swift

@@ -4,11 +4,11 @@ import Foundation
 @MainActor
 final class MovieLoader: ObservableObject {
     @Published
-    private(set) var pages = AsyncPhase<[PagedResponse<Movie>], Error>.suspending
-    private let api: APIClientProtocol
+    private(set) var pages = AsyncPhase<[PagedResponse<Movie>], any Error>.suspending
+    private let api: any APIClientProtocol
     let filter: Filter
 
-    init(api: APIClientProtocol, filter: Filter) {
+    init(api: any APIClientProtocol, filter: Filter) {
         self.api = api
         self.filter = filter
     }

Examples/Packages/iOS/Sources/ExampleMovieDB/Backend/APIClient.swift

@@ -95,10 +95,10 @@ private extension APIClient {
 }
 
 final class MockAPIClient: APIClientProtocol, @unchecked Sendable {
-    var imageResponse = Result<UIImage, Error>.failure(URLError(.unknown))
-    var filteredMovieResponse = Result<PagedResponse<Movie>, Error>.failure(URLError(.unknown))
-    var creditsResponse = Result<Credits, Error>.failure(URLError(.unknown))
-    var searchMoviesResponse = Result<PagedResponse<Movie>, Error>.failure(URLError(.unknown))
+    var imageResponse = Result<UIImage, any Error>.failure(URLError(.unknown))
+    var filteredMovieResponse = Result<PagedResponse<Movie>, any Error>.failure(URLError(.unknown))
+    var creditsResponse = Result<Credits, any Error>.failure(URLError(.unknown))
+    var searchMoviesResponse = Result<PagedResponse<Movie>, any Error>.failure(URLError(.unknown))
 
     func getImage(path: String, size: ImageSize) async throws -> UIImage {
         try imageResponse.get()

Examples/Packages/iOS/Sources/ExampleMovieDB/Entities/Failable.swift

@@ -1,20 +1,20 @@
 @propertyWrapper
-struct Failable<T: Decodable & Sendable>: Decodable & Sendable {
+struct Failable<T: Decodable & Sendable>: Decodable, Sendable {
     var wrappedValue: T?
 
     init(wrappedValue: T?) {
         self.wrappedValue = wrappedValue
     }
 
-    init(from decoder: Decoder) throws {
+    init(from decoder: any Decoder) throws {
         let container = try decoder.singleValueContainer()
         let wrappedValue = try? container.decode(T.self)
         self.init(wrappedValue: wrappedValue)
     }
 }
 
 extension Failable: Encodable where T: Encodable {
-    func encode(to encoder: Encoder) throws {
+    func encode(to encoder: any Encoder) throws {
         var container = encoder.singleValueContainer()
         try container.encode(wrappedValue)
     }

Examples/Packages/iOS/Sources/ExampleMovieDB/Views/CastList.swift

@@ -7,7 +7,7 @@ struct CastList: View {
     @ViewContext
     var context
 
-    var casts: AsyncPhase<[Credits.Person], Error> {
+    var casts: AsyncPhase<[Credits.Person], any Error> {
         context.watch(CastsAtom(movieID: movieID).phase)
     }
 

Examples/Packages/iOS/Sources/ExampleMovieDB/Views/NetworkImage.swift

@@ -8,7 +8,7 @@ struct NetworkImage: View {
     @ViewContext
     var context
 
-    var image: Task<UIImage, Error> {
+    var image: Task<UIImage, any Error> {
         context.watch(ImageAtom(path: path, size: size))
     }
 

Examples/Packages/iOS/Sources/ExampleVoiceMemo/Atoms/VoiceMemoListAtoms.swift

@@ -17,7 +17,7 @@ struct RecordingData: Equatable {
 
 @MainActor
 struct VoiceMemoActions {
-    let context: AtomContext
+    let context: any AtomContext
 
     func toggleRecording() {
         let isRecording = context.read(IsRecordingAtom())
@@ -68,13 +68,13 @@ struct VoiceMemoActionsAtom: ValueAtom, Hashable {
 }
 
 struct AudioSessionAtom: ValueAtom, Hashable {
-    func value(context: Context) -> AudioSessionProtocol {
+    func value(context: Context) -> any AudioSessionProtocol {
         AVAudioSession.sharedInstance()
     }
 }
 
 struct AudioRecorderAtom: ValueAtom, Hashable {
-    func value(context: Context) -> AudioRecorderProtocol {
+    func value(context: Context) -> any AudioRecorderProtocol {
         AudioRecorder {
             context[IsRecordingFailedAtom()] = true
             context[RecordingDataAtom()] = nil

Examples/Packages/iOS/Sources/ExampleVoiceMemo/Atoms/VoiceMemoRowAtoms.swift

@@ -62,7 +62,7 @@ struct AudioPlayerAtom: ValueAtom {
         voiceMemo.url
     }
 
-    func value(context: Context) -> AudioPlayerProtocol {
+    func value(context: Context) -> any AudioPlayerProtocol {
         AudioPlayer(
             onFinish: {
                 context[IsPlayingAtom(voiceMemo: voiceMemo)] = false

Examples/Packages/iOS/Sources/ExampleVoiceMemo/Dependency/AudioPlayer.swift

@@ -36,14 +36,14 @@ final class AudioPlayer: NSObject, AVAudioPlayerDelegate, AudioPlayerProtocol {
         }
     }
 
-    func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
+    func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: (any Error)?) {
         onFail()
     }
 }
 
 final class MockAudioPlayer: AudioPlayerProtocol, @unchecked Sendable {
     private(set) var isPlaying = false
-    var playingError: Error?
+    var playingError: (any Error)?
 
     func play(url: URL) throws {
         if let playingError = playingError {

Examples/Packages/iOS/Sources/ExampleVoiceMemo/Dependency/AudioRecorder.swift

@@ -45,14 +45,14 @@ final class AudioRecorder: NSObject, AVAudioRecorderDelegate, AudioRecorderProto
         }
     }
 
-    func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
+    func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: (any Error)?) {
         onFail()
     }
 }
 
 final class MockAudioRecorder: AudioRecorderProtocol, @unchecked Sendable {
     var isRecording = false
-    var recordingError: Error?
+    var recordingError: (any Error)?
     var currentTime: TimeInterval = 10
 
     func record(url: URL) throws {

Package.swift

@@ -2,6 +2,10 @@
 
 import PackageDescription
 
+let swiftSettings: [SwiftSetting] = [
+    .enableUpcomingFeature("ExistentialAny")
+]
+
 let package = Package(
     name: "swiftui-atom-properties",
     platforms: [
@@ -14,10 +18,14 @@ let package = Package(
         .library(name: "Atoms", targets: ["Atoms"])
     ],
     targets: [
-        .target(name: "Atoms"),
+        .target(
+            name: "Atoms",
+            swiftSettings: swiftSettings
+        ),
         .testTarget(
             name: "AtomsTests",
-            dependencies: ["Atoms"]
+            dependencies: ["Atoms"],
+            swiftSettings: swiftSettings
         ),
     ],
     swiftLanguageModes: [.v5, .v6]

README.md

@@ -482,7 +482,7 @@ struct UserView: View {
 |           |Description|
 |:----------|:----------|
 |Summary    |Initiates a throwing `Task` from the given `async throws` function.|
-|Output     |`Task<T, Error>`|
+|Output     |`Task<T, any Error>`|
 |Use Case   |Throwing asynchronous operation e.g. API call|
 
 <details><summary><code>📖 Example</code></summary>
@@ -519,7 +519,7 @@ struct MoviesView: View {
 |           |Description|
 |:----------|:----------|
 |Summary    |Provides a `AsyncPhase` value that represents asynchronous, sequential elements of the given `AsyncSequence`.|
-|Output     |`AsyncPhase<T, Error>`|
+|Output     |`AsyncPhase<T, any Error>`|
 |Use Case   |Handle multiple asynchronous values e.g. web-sockets|
 
 <details><summary><code>📖 Example</code></summary>
@@ -744,7 +744,7 @@ struct FetchWeatherAtom: ThrowingTaskAtom, Hashable {
 
 struct WeatherReportView: View {
     @Watch(FetchWeatherAtom().phase)
-    var weatherPhase  // : AsyncPhase<Weather, Error>
+    var weatherPhase  // : AsyncPhase<Weather, any Error>
 
     var body: some View {
         switch weatherPhase {
@@ -833,11 +833,11 @@ private struct FetchMoviesTaskAtom: ThrowingTaskAtom, Hashable {
 }
 
 struct FetchMoviesPhaseAtom: ValueAtom, Refreshable, Hashable {
-    func value(context: Context) -> AsyncPhase<[Movies], Error> {
+    func value(context: Context) -> AsyncPhase<[Movies], any Error> {
         context.watch(FetchMoviesTaskAtom().phase)
     }
 
-    func refresh(context: CurrentContext) async -> AsyncPhase<[Movies], Error> {
+    func refresh(context: CurrentContext) async -> AsyncPhase<[Movies], any Error> {
         await context.refresh(FetchMoviesTaskAtom().phase)
     }
 
@@ -1093,7 +1093,7 @@ struct BooksView: View {
 
     var body: some View {
         // watch
-        let booksTask = context.watch(FetchBooksAtom())     // Task<[Book], Error>
+        let booksTask = context.watch(FetchBooksAtom())     // Task<[Book], any Error>
         // binding
         let searchQuery = context.binding(SearchQueryAtom())  // Binding<String>
 
@@ -1159,7 +1159,7 @@ struct LocationManagerDelegateAtom: ValueAtom, Hashable {
 }
 
 struct LocationManagerAtom: ValueAtom, Hashable {
-    func value(context: Context) -> LocationManagerProtocol {
+    func value(context: Context) -> any LocationManagerProtocol {
         let delegate = context.watch(LocationManagerDelegateAtom())
         let manager = CLLocationManager()
         manager.delegate = delegate
@@ -1194,7 +1194,7 @@ struct APIClient: APIClientProtocol { ... }
 struct MockAPIClient: APIClientProtocol { ... }
 
 struct APIClientAtom: ValueAtom, Hashable {
-    func value(context: Context) -> APIClientProtocol {
+    func value(context: Context) -> any APIClientProtocol {
         APIClient()
     }
 }
@@ -1252,7 +1252,7 @@ Optionally, you can pass `suspending` content to be displayed until the task com
 ```swift
 struct NewsView: View {
     @Watch(LatestNewsAtom())
-    var newsTask: Task<News, Error>
+    var newsTask: Task<News, any Error>
 
     var body: some View {
         Suspense(newsTask) { news in
@@ -1486,7 +1486,7 @@ class MockAPIClient: APIClientProtocol {
 }
 
 struct APIClientAtom: ValueAtom, Hashable {
-    func value(context: Context) -> APIClientProtocol {
+    func value(context: Context) -> any APIClientProtocol {
         APIClient()
     }
 }
@@ -1715,7 +1715,7 @@ class MessageLoader: ObservableObject {
     let context: AtomContext
 
     @Published
-    var phase = AsyncPhase<[Message], Error>.suspending
+    var phase = AsyncPhase<[Message], any Error>.suspending
 
     init(context: AtomContext) {
         self.context = context