add tests for Swift 6 compile

Author: stevensJourney

.github/workflows/build_and_test.yaml

@@ -19,3 +19,20 @@ jobs:
           xcodebuild test -scheme PowerSync -destination "platform=iOS Simulator,name=iPhone 16"
           xcodebuild test -scheme PowerSync -destination "platform=macOS,arch=arm64,name=My Mac"
           xcodebuild test -scheme PowerSync -destination "platform=watchOS Simulator,arch=arm64,name=Apple Watch Ultra 2 (49mm)"
+
+  buildSwift6:
+    name: Build and test with Swift 6
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up XCode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: latest-stable
+      - name: Use Swift 6
+        run: |
+          sed -i '' 's|// swift-tools-version:[0-9.]*|// swift-tools-version:6.1|' Package.swift
+      - name: Build and Test
+        run: |
+          swift build -Xswiftc -strict-concurrency=complete
+          swift test -Xswiftc -strict-concurrency=complete

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.1
+// swift-tools-version: 5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -77,12 +77,6 @@ let package = Package(
         .testTarget(
             name: "PowerSyncTests",
             dependencies: ["PowerSync"],
-            // swiftSettings: [
-            //     .unsafeFlags([
-            //         "-enable-upcoming-feature", "StrictConcurrency=complete",
-            //         "-enable-upcoming-feature", "RegionBasedIsolation",
-            //     ]),
-            // ]
         ),
     ] + conditionalTargets
 )