fix: UserAgent actor isolation (#110)

Author: stevensJourney

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 1.11.0 (unreleased)
 
 * Add support for [sync streams](https://docs.powersync.com/sync/streams/overview).
+* Fixed MainActor isolation warning for UserAgent function.
 
 ## 1.10.0
 

Sources/PowerSync/Kotlin/sync/UserAgent.swift

@@ -1,29 +1,32 @@
-import Foundation
 
+import Foundation
 #if os(iOS) || os(tvOS)
 import UIKit
 #endif
 
-func userAgent() -> String {
-    #if os(macOS)
+func userAgent() async -> String {
+#if os(macOS)
     let osName = "macOS"
-    let version = ProcessInfo.processInfo.operatingSystemVersion
-    let osVersion = "\(version.majorVersion).\(version.minorVersion)"
-    #elseif os(watchOS)
+#elseif os(watchOS)
     let osName = "watchOS"
-    let version = ProcessInfo.processInfo.operatingSystemVersion
-    let osVersion = "\(version.majorVersion).\(version.minorVersion)"
-    #elseif os(iOS)
+#elseif os(iOS)
     let osName = "iOS"
-    let osVersion = UIDevice.current.systemVersion
-    #elseif os(tvOS)
+#elseif os(tvOS)
     let osName = "tvOS"
-    let osVersion = UIDevice.current.systemVersion
-    #else
+#else
     let osName = "unknown"
-    let version = ProcessInfo.processInfo.operatingSystemVersion
-    let osVersion = "\(version.majorVersion).\(version.minorVersion)"
-    #endif
-    
+#endif
+    let osVersion = await getOSVersion()
     return "powersync-swift/\(libraryVersion) \(osName)/\(osVersion)"
 }
+
+// Returns the OS version string for the current platform
+@MainActor func getOSVersion() async -> String {
+#if os(iOS) || os(tvOS)
+    // UIDevice must be accessed on the main actor
+    return UIDevice.current.systemVersion
+#else
+    let version = ProcessInfo.processInfo.operatingSystemVersion
+    return "\(version.majorVersion).\(version.minorVersion)"
+#endif
+}