Isolation updates

.github/workflows/ci.yml

@@ -14,12 +14,12 @@ on:
       - main
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
+  DEVELOPER_DIR: /Applications/Xcode_15.2.app/Contents/Developer
 
 jobs:
   test:
     name: Test
-    runs-on: macOS-13
+    runs-on: macOS-14
     strategy:
       matrix:
         destination:
@@ -28,7 +28,5 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - name: Install XCBeautify
-        run: brew install xcbeautify
       - name: Test platform ${{ matrix.destination }}
-        run: set -o pipefail && xcodebuild -scheme Extendable-Package -destination "${{ matrix.destination }}" test | xcbeautify --renderer github-actions
+        run: set -o pipefail && xcodebuild -scheme Extendable-Package -destination "${{ matrix.destination }}" test | xcbeautify

README.md

@@ -10,6 +10,9 @@
 # Extendable
 A set of utilities for more pleasant work with ExtensionKit
 
+> [!NOTE]
+> CI failure for the main branch is expected until Swift 5.10 is available in GitHub action images.
+
 ## Installation
 
 ```swift
@@ -125,6 +128,23 @@ You can its `AppExtensionBrowserView` and `ExtensionHostingView` to integrate th
 let process = try await AppExtensionProcess(appExtensionIdentity: identity)
 ```
 
+## Isolation and AppExtension
+
+Currently, the `init` in the `AppExtention` protocol lacks any isolation. This makes it difficult to initialize instance variables if you are relying on the true-but-unexpressed `@MainActor` isolation of extensions. I've included a workaround that can help. SE-0414 will make this unecessary, as will ExtensionFoundation adding annotations. In the mean time though, it's nice to have no warnings.
+
+```swift
+@main
+final class MyExtension: AppExtension {
+	@InitializerTransferred private var value: MainActorType
+
+	nonisolated init() {
+		self._value = InitializerTransferred(mainActorProvider: {
+			MainActorType()
+		})
+	}
+}
+```
+
 ## Contributing and Collaboration
 
 I would love to hear from you! Issues or pull requests work great. A [Discord server][discord] is also available for live help, but I have a strong bias towards answering in the form of documentation.

Sources/Extendable/AppExtension+Init.swift

@@ -0,0 +1,21 @@
+import Foundation
+
+// from https://forums.swift.org/t/complete-checking-with-an-incorrectly-annotated-init-conformance/69955/7
+
+/// Used to initialize properties for non-isolated init conformance.
+///
+/// Will be obseleted by SE-0414
+@propertyWrapper
+public struct InitializerTransferred<Value>: @unchecked Sendable {
+	public let wrappedValue: Value
+
+	public init(_ wrappedValue: Value) {
+		self.wrappedValue = wrappedValue
+	}
+
+	public init(mainActorProvider: @MainActor () -> Value) {
+		self.wrappedValue = MainActor.assumeIsolated {
+			mainActorProvider()
+		}
+	}
+}

Sources/Extendable/ConnectingAppExtensionScene.swift

@@ -49,7 +49,7 @@ public struct ConnectingAppExtensionScene<Content: View>: AppExtensionScene {
 
 
 	public nonisolated var body: some AppExtensionScene {
-		MainActor.runUnsafely {
+		MainActor.assumeIsolated {
 			PrimitiveAppExtensionScene(id: sceneID) {
 				connectingView
 			} onConnection: { connection in

Sources/ExtendableHost/ExtensionHostingView.swift

@@ -49,7 +49,7 @@ extension ExtensionHostingView {
 		}
 
 		public nonisolated func hostViewControllerDidActivate(_ viewController: EXHostViewController) {
-			MainActor.runUnsafely {
+			MainActor.assumeIsolated {
 				guard let handler = connectionHandler else { return }
 
 				do {