Various tweaks

.github/workflows/main.yml

@@ -4,10 +4,10 @@ on:
   - pull_request
 jobs:
   test:
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
-      - run: sudo xcode-select -switch /Applications/Xcode_15.2.app
+      - run: sudo xcode-select -switch /Applications/Xcode_15.3.app
       - run: swift test
   lint:
     runs-on: ubuntu-latest

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version:5.10
 import PackageDescription
 
 let package = Package(

Sources/Defaults/Defaults+Extensions.swift

@@ -171,7 +171,7 @@ extension UserDefaults: DefaultsKeyValueStore {}
 extension DefaultsLockProtocol {
 	@discardableResult
 	func with<R>(_ body: @Sendable () throws -> R) rethrows -> R where R: Sendable {
-		self.lock()
+		lock()
 		defer {
 			self.unlock()
 		}

Sources/Defaults/Defaults+Protocol.swift

@@ -1,6 +1,23 @@
 import Foundation
 
-public protocol _DefaultsSerializable {
+extension Defaults {
+	/**
+	Types that conform to this protocol can be used with `Defaults`.
+
+	The type should have a static variable `bridge` which should reference an instance of a type that conforms to `Defaults.Bridge`.
+
+	```swift
+	struct User {
+		username: String
+		password: String
+	}
+
+	extension User: Defaults.Serializable {
+		static let bridge = UserBridge()
+	}
+	```
+	*/
+	public protocol Serializable {
 		typealias Value = Bridge.Value
 		typealias Serializable = Bridge.Serializable
 		associatedtype Bridge: Defaults.Bridge
@@ -15,36 +32,59 @@ public protocol _DefaultsSerializable {
 		*/
 		static var isNativelySupportedType: Bool { get }
 	}
+}
 
-public protocol _DefaultsBridge {
+extension Defaults {
+	public protocol Bridge {
 		associatedtype Value
 		associatedtype Serializable
 
 		func serialize(_ value: Value?) -> Serializable?
 		func deserialize(_ object: Serializable?) -> Value?
 	}
+}
 
-public protocol _DefaultsCollectionSerializable: Collection, Defaults.Serializable {
+extension Defaults {
+	/**
+	Ambiguous bridge selector protocol that lets you select your preferred bridge when there are multiple possibilities.
+
+	```swift
+	enum Interval: Int, Codable, Defaults.Serializable, Defaults.PreferRawRepresentable {
+		case tenMinutes = 10
+		case halfHour = 30
+		case oneHour = 60
+	}
+	```
+
+	By default, if an `enum` conforms to `Codable` and `Defaults.Serializable`, it will use the `CodableBridge`, but by conforming to `Defaults.PreferRawRepresentable`, we can switch the bridge back to `RawRepresentableBridge`.
+	*/
+	public protocol PreferRawRepresentable: RawRepresentable {}
+
+	/**
+	Ambiguous bridge selector protocol that lets you select your preferred bridge when there are multiple possibilities.
+	*/
+	public protocol PreferNSSecureCoding: NSObject, NSSecureCoding {}
+}
+
+extension Defaults {
+	public protocol CollectionSerializable: Collection, Serializable {
 		/**
 		`Collection` does not have a initializer, but we need a initializer to convert an array into the `Value`.
 		*/
 		init(_ elements: [Element])
 	}
 
-public protocol _DefaultsSetAlgebraSerializable: SetAlgebra, Defaults.Serializable {
+	public protocol SetAlgebraSerializable: SetAlgebra, Serializable {
 		/**
 		Since `SetAlgebra` protocol does not conform to `Sequence`, we cannot convert a `SetAlgebra` to an `Array` directly.
 		*/
 		func toArray() -> [Element]
 	}
 
-public protocol _DefaultsCodableBridge: Defaults.Bridge where Serializable == String, Value: Codable {}
+	public protocol CodableBridge: Bridge where Serializable == String, Value: Codable {}
-
-public protocol _DefaultsPreferRawRepresentable: RawRepresentable {}
-public protocol _DefaultsPreferNSSecureCoding: NSObject, NSSecureCoding {}
 
 	// Essential properties for serializing and deserializing `ClosedRange` and `Range`.
-public protocol _DefaultsRange {
+	public protocol Range {
 		associatedtype Bound: Comparable, Defaults.Serializable
 
 		var lowerBound: Bound { get }
@@ -53,6 +93,61 @@ public protocol _DefaultsRange {
 		init(uncheckedBounds: (lower: Bound, upper: Bound))
 	}
 
+	/**
+	A `Bridge` is responsible for serialization and deserialization.
+
+	It has two associated types `Value` and `Serializable`.
+
+	- `Value`: The type you want to use.
+	- `Serializable`: The type stored in `UserDefaults`.
+	- `serialize`: Executed before storing to the `UserDefaults` .
+	- `deserialize`: Executed after retrieving its value from the `UserDefaults`.
+
+	```swift
+	struct User {
+		username: String
+		password: String
+	}
+
+	extension User {
+		static let bridge = UserBridge()
+	}
+
+	struct UserBridge: Defaults.Bridge {
+		typealias Value = User
+		typealias Serializable = [String: String]
+
+		func serialize(_ value: Value?) -> Serializable? {
+			guard let value else {
+				return nil
+			}
+
+			return [
+				"username": value.username,
+				"password": value.password
+			]
+		}
+
+		func deserialize(_ object: Serializable?) -> Value? {
+			guard
+				let object,
+				let username = object["username"],
+				let password = object["password"]
+			else {
+				return nil
+			}
+
+			return User(
+				username: username,
+				password: password
+			)
+		}
+	}
+	```
+	*/
+	public typealias RangeSerializable = Defaults.Range & Serializable
+}
+
 /**
 Essential properties for synchronizing a key value store.
 */

Sources/Defaults/Defaults+iCloud.swift

@@ -6,6 +6,196 @@ import UIKit
 #endif
 import Combine
 import Foundation
+#if os(watchOS)
+import WatchKit
+#endif
+
+extension Defaults {
+	/**
+	Synchronize values across devices using iCloud.
+
+	To synchronize a key with iCloud, set `iCloud: true` on the ``Defaults/Key``. That's it! ✨
+
+	```swift
+	import Defaults
+
+	extension Defaults.Keys {
+		static let isUnicornMode = Key<Bool>("isUnicornMode", default: false, iCloud: true)
+	}
+
+	// …
+
+	// This change will now be synced to other devices.
+	Defaults[.isUnicornMode] = true
+	```
+
+	- Important: You need to enable the `iCloud` capability in the “Signing and Capabilities” tab in Xcode and then enable “Key-value storage” in the iCloud services.
+
+	## Notes
+
+	- If there is a conflict, it will use the latest change.
+	- Max 1024 keys and a total of 1 MB storage.
+	- It uses [`NSUbiquitousKeyValueStore`](https://developer.apple.com/documentation/foundation/nsubiquitouskeyvaluestore) internally.
+
+	## Dynamically Toggle Syncing
+
+	You can also toggle the syncing behavior dynamically using the ``Defaults/iCloud/add(_:)-5gffb`` and ``Defaults/iCloud/remove(_:)-1b8w5`` methods.
+
+	```swift
+	import Defaults
+
+	extension Defaults.Keys {
+		static let isUnicornMode = Key<Bool>("isUnicornMode", default: false)
+	}
+
+	// …
+
+	if shouldSync {
+		Defaults.iCloud.add(.isUnicornMode)
+	}
+	```
+	*/
+	public enum iCloud {
+		/**
+		The singleton for Defaults's iCloudSynchronizer.
+		*/
+		static var synchronizer = iCloudSynchronizer(remoteStorage: NSUbiquitousKeyValueStore.default)
+
+		/**
+		The synced keys.
+		*/
+		public static var keys: Set<Defaults.Keys> { synchronizer.keys }
+
+		// Note: Can be made public if someone shows a real use-case for it.
+		/**
+		Enable this if you want the key to be synced right away when it's changed.
+		*/
+		static var syncOnChange = true
+
+		/**
+		Log debug info about the syncing.
+
+		It will include details such as the key being synced, its corresponding value, and the status of the synchronization.
+		*/
+		public static var isDebug = false
+
+		/**
+		Add the keys to be automatically synced.
+		*/
+		public static func add(_ keys: Defaults.Keys...) {
+			synchronizer.add(keys)
+		}
+
+		/**
+		Add the keys to be automatically synced.
+		*/
+		public static func add(_ keys: [Defaults.Keys]) {
+			synchronizer.add(keys)
+		}
+
+		/**
+		Remove the keys that are set to be automatically synced.
+		*/
+		public static func remove(_ keys: Defaults.Keys...) {
+			synchronizer.remove(keys)
+		}
+
+		/**
+		Remove the keys that are set to be automatically synced.
+		*/
+		public static func remove(_ keys: [Defaults.Keys]) {
+			synchronizer.remove(keys)
+		}
+
+		/**
+		Remove all keys that are set to be automatically synced.
+		*/
+		public static func removeAll() {
+			synchronizer.removeAll()
+		}
+
+		/**
+		Waits for the completion of synchronization.
+
+		You generally don't need this as synchronization is automatic, but in some cases it could be useful to not continue until all values are synchronized to the cloud.
+
+		```swift
+		import Defaults
+
+		extension Defaults.Keys {
+			static let isUnicornMode = Key<Bool>("isUnicornMode", default: false, iCloud: true)
+		}
+
+		// …
+
+		Task {
+			Defaults[.isUnicornMode] = true
+
+			print(Defaults[.isUnicornMode])
+			//=> true
+
+			await Defaults.iCloud.waitForSyncCompletion()
+
+			// The value is now synchronized to the cloud too.
+		}
+		```
+		*/
+		public static func waitForSyncCompletion() async {
+			await synchronizer.sync()
+		}
+
+		// Only make these public if there is an actual need.
+		// https://github.com/sindresorhus/Defaults/pull/136#discussion_r1544546756
+
+		/**
+		Create synchronization tasks for all the keys that have been added to the ``Defaults/iCloud``.
+		*/
+		static func syncWithoutWaiting() {
+			synchronizer.syncWithoutWaiting()
+		}
+
+		/**
+		Create synchronization tasks for the specified `keys` from the given source, which can be either a remote server or a local cache.
+
+		- Parameter keys: The keys that should be synced.
+		- Parameter source: Sync keys from which data source(remote or local)
+
+		- Note: `source` should be specified if `key` has not been added to ``Defaults/iCloud``.
+		*/
+		static func syncWithoutWaiting(_ keys: Defaults.Keys..., source: DataSource? = nil) {
+			synchronizer.syncWithoutWaiting(keys, source)
+		}
+
+		/**
+		Create synchronization tasks for the specified `keys` from the given source, which can be either a remote server or a local cache.
+
+		- Parameter keys: The keys that should be synced.
+		- Parameter source: Sync keys from which data source(remote or local)
+
+		- Note: `source` should be specified if `key` has not been added to ``Defaults/iCloud``.
+		*/
+		static func syncWithoutWaiting(_ keys: [Defaults.Keys], source: DataSource? = nil) {
+			synchronizer.syncWithoutWaiting(keys, source)
+		}
+	}
+}
+
+extension Defaults.iCloud {
+	/**
+	Represent different data sources available for synchronization.
+	*/
+	public enum DataSource {
+		/**
+		Using `key.suite` as data source.
+		*/
+		case local
+
+		/**
+		Using `NSUbiquitousKeyValueStore` as data source.
+		*/
+		case remote
+	}
+}
 
 private enum SyncStatus {
 	case idle
@@ -31,7 +221,7 @@ final class iCloudSynchronizer {
 
 	@TaskLocal static var timestamp: Date?
 
-	private var cancellables: Set<AnyCancellable> = []
+	private var cancellables = Set<AnyCancellable>()
 
 	/**
 	Key for recording the synchronization between `NSUbiquitousKeyValueStore` and `UserDefaults`.
@@ -63,14 +253,14 @@ final class iCloudSynchronizer {
 		guard
 			let self,
 			let suite = observable.suite,
-			let key = self.keys.first(where: { $0.name == observable.key && $0.suite == suite }),
+			let key = keys.first(where: { $0.name == observable.key && $0.suite == suite }),
 			// Prevent triggering local observation when syncing from remote.
-			!self.remoteSyncingKeys.contains(key)
+			!remoteSyncingKeys.contains(key)
 		else {
 			return
 		}
 
-		self.enqueue {
+		enqueue {
 			self.recordTimestamp(forKey: key, timestamp: Self.timestamp, source: .local)
 			await self.syncKey(key, source: .local)
 		}
@@ -81,7 +271,7 @@ final class iCloudSynchronizer {
 	*/
 	func add(_ keys: [Defaults.Keys]) {
 		self.keys.formUnion(keys)
-		self.syncWithoutWaiting(keys)
+		syncWithoutWaiting(keys)
 		for key in keys {
 			localKeysMonitor.addObserver(key)
 		}
@@ -119,12 +309,12 @@ final class iCloudSynchronizer {
 	- Parameter keys: If the keys parameter is an empty array, the method will use the keys that were added to `Defaults.iCloud`.
 	- Parameter source: Sync keys from which data source (remote or local).
 	*/
-	func syncWithoutWaiting(_ keys: [Defaults.Keys] = [], _ source: Defaults.DataSource? = nil) {
+	func syncWithoutWaiting(_ keys: [Defaults.Keys] = [], _ source: Defaults.iCloud.DataSource? = nil) {
 		let keys = keys.isEmpty ? Array(self.keys) : keys
 
 		for key in keys {
 			let latest = source ?? latestDataSource(forKey: key)
-			self.enqueue {
+			enqueue {
 				await self.syncKey(key, source: latest)
 			}
 		}
@@ -141,7 +331,7 @@ final class iCloudSynchronizer {
 	Enqueue the synchronization task into `backgroundQueue` with the current timestamp.
 	*/
 	private func enqueue(_ task: @escaping TaskQueue.AsyncTask) {
-		self.backgroundQueue.async {
+		backgroundQueue.async {
 			await Self.$timestamp.withValue(Date()) {
 				await task()
 			}
@@ -154,7 +344,7 @@ final class iCloudSynchronizer {
 	- Parameter key: The key to synchronize.
 	- Parameter source: Sync key from which data source (remote or local).
 	*/
-	private func syncKey(_ key: Defaults.Keys, source: Defaults.DataSource) async {
+	private func syncKey(_ key: Defaults.Keys, source: Defaults.iCloud.DataSource) async {
 		Self.logKeySyncStatus(key, source: source, syncStatus: .idle)
 
 		switch source {
@@ -227,7 +417,7 @@ final class iCloudSynchronizer {
 
 	The timestamp storage format varies across different source providers due to storage limitations.
 	*/
-	private func timestamp(forKey key: Defaults.Keys, source: Defaults.DataSource) -> Date? {
+	private func timestamp(forKey key: Defaults.Keys, source: Defaults.iCloud.DataSource) -> Date? {
 		switch source {
 		case .remote:
 			guard
@@ -252,7 +442,7 @@ final class iCloudSynchronizer {
 	/**
 	Mark the current timestamp to the given storage.
 	*/
-	func recordTimestamp(forKey key: Defaults.Keys, timestamp: Date?, source: Defaults.DataSource) {
+	func recordTimestamp(forKey key: Defaults.Keys, timestamp: Date?, source: Defaults.iCloud.DataSource) {
 		switch source {
 		case .remote:
 			guard
@@ -275,12 +465,12 @@ final class iCloudSynchronizer {
 	/**
 	Determine which data source has the latest data available by comparing the timestamps of the local and remote sources.
 	*/
-	private func latestDataSource(forKey key: Defaults.Keys) -> Defaults.DataSource {
+	private func latestDataSource(forKey key: Defaults.Keys) -> Defaults.iCloud.DataSource {
 		// If the remote timestamp does not exist, use the local timestamp as the latest data source.
-		guard let remoteTimestamp = self.timestamp(forKey: key, source: .remote) else {
+		guard let remoteTimestamp = timestamp(forKey: key, source: .remote) else {
 			return .local
 		}
-		guard let localTimestamp = self.timestamp(forKey: key, source: .local) else {
+		guard let localTimestamp = timestamp(forKey: key, source: .local) else {
 			return .remote
 		}
 
@@ -288,9 +478,7 @@ final class iCloudSynchronizer {
 	}
 }
 
-/**
+// Notification related functions.
-`iCloudSynchronizer` notification related functions.
-*/
 extension iCloudSynchronizer {
 	private func registerNotifications() {
 		// TODO: Replace it with async stream when Swift supports custom executors.
@@ -301,27 +489,28 @@ extension iCloudSynchronizer {
 					return
 				}
 
-				self.didChangeExternally(notification: notification)
+				didChangeExternally(notification: notification)
 			}
 			.store(in: &cancellables)
 
-		// TODO: Replace it with async stream when Swift supports custom executors.
+		#if canImport(UIKit)
-		#if os(iOS) || os(tvOS) || os(visionOS)
+		#if os(watchOS)
-		NotificationCenter.default
+		let notificationName = WKExtension.applicationWillEnterForegroundNotification
-			.publisher(for: UIScene.willEnterForegroundNotification)
+		#else
-		#elseif os(watchOS)
+		let notificationName = UIScene.willEnterForegroundNotification
-		NotificationCenter.default
-			.publisher(for: WKExtension.applicationWillEnterForegroundNotification)
 		#endif
-		#if os(iOS) || os(tvOS) || os(watchOS) || os(visionOS)
+
+		// TODO: Replace it with async stream when Swift supports custom executors.
+		NotificationCenter.default
+			.publisher(for: notificationName)
 			.sink { [weak self] notification in
 				guard let self else {
 					return
 				}
 
-				self.willEnterForeground(notification: notification)
+				willEnterForeground(notification: notification)
 			}
-			.store(in: cancellables)
+			.store(in: &cancellables)
 		#endif
 	}
 
@@ -343,7 +532,7 @@ extension iCloudSynchronizer {
 			return
 		}
 
-		for key in self.keys where changedKeys.contains(key.name) {
+		for key in keys where changedKeys.contains(key.name) {
 			guard let remoteTimestamp = self.timestamp(forKey: key, source: .remote) else {
 				continue
 			}
@@ -361,14 +550,16 @@ extension iCloudSynchronizer {
 	}
 }
 
-/**
+// Logging related functions.
-`iCloudSynchronizer` logging related functions.
-*/
 extension iCloudSynchronizer {
-	@available(macOS 11, iOS 14, tvOS 14, watchOS 7, visionOS 1.0, *)
 	private static let logger = Logger(OSLog.default)
 
-	private static func logKeySyncStatus(_ key: Defaults.Keys, source: Defaults.DataSource, syncStatus: SyncStatus, value: Any? = nil) {
+	private static func logKeySyncStatus(
+		_ key: Defaults.Keys,
+		source: Defaults.iCloud.DataSource,
+		syncStatus: SyncStatus,
+		value: Any? = nil
+	) {
 		guard Defaults.iCloud.isDebug else {
 			return
 		}
@@ -401,173 +592,6 @@ extension iCloudSynchronizer {
 			return
 		}
 
-		if #available(macOS 11, iOS 14, tvOS 14, watchOS 7, visionOS 1.0, *) {
 		logger.debug("[Defaults.iCloud] \(message)")
-		} else {
-			#if canImport(OSLog)
-			os_log(.debug, log: .default, "[Defaults.iCloud] %@", message)
-			#else
-			let dateFormatter = DateFormatter()
-			dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSSSSSZZZ"
-			let dateString = dateFormatter.string(from: Date())
-			let processName = ProcessInfo.processInfo.processName
-			let processIdentifier = ProcessInfo.processInfo.processIdentifier
-			var threadID: UInt64 = 0
-			pthread_threadid_np(nil, &threadID)
-			print("\(dateString) \(processName)[\(processIdentifier):\(threadID)] [Defaults.iCloud] \(message)")
-			#endif
-		}
-	}
-}
-
-extension Defaults {
-	/**
-	Represent different data sources available for synchronization.
-	*/
-	public enum DataSource {
-		/**
-		Using `key.suite` as data source.
-		*/
-		case local
-
-		/**
-		Using `NSUbiquitousKeyValueStore` as data source.
-		*/
-		case remote
-	}
-
-	/**
-	Synchronize values with different devices over iCloud.
-
-	There are five ways to initiate synchronization, each of which will create a synchronization task in ``Defaults/iCloud/iCloud``:
-
-	1. Using ``iCloud/add(_:)-5gffb``
-	2. Utilizing ``iCloud/syncWithoutWaiting(_:source:)-9cpju``
-	3. Observing UserDefaults for added ``Defaults/Defaults/Key`` using Key-Value Observation (KVO)
-	4. Monitoring `NSUbiquitousKeyValueStore.didChangeExternallyNotification` for added ``Defaults/Defaults/Key``.
-	5. Initializing ``Defaults/Defaults/Keys`` with parameter `iCloud: true`.
-
-	> Tip: After initializing the task, we can call ``iCloud/sync()`` to ensure that all tasks in the backgroundQueue are completed.
-
-	```swift
-	import Defaults
-
-	extension Defaults.Keys {
-		static let isUnicornMode = Key<Bool>("isUnicornMode", default: true, iCloud: true)
-	}
-
-	Task {
-		let quality = Defaults.Key<Int>("quality", default: 0)
-		Defaults.iCloud.add(quality)
-		await Defaults.iCloud.sync() // Optional step: only needed if you require everything to be synced before continuing.
-		// Both `isUnicornMode` and `quality` are synced.
-	}
-	```
-	*/
-	public enum iCloud {
-		/**
-		The singleton for Defaults's iCloudSynchronizer.
-		*/
-		static var synchronizer = iCloudSynchronizer(remoteStorage: NSUbiquitousKeyValueStore.default)
-
-		/**
-		The synced keys.
-		*/
-		public static var keys: Set<Defaults.Keys> { synchronizer.keys }
-
-		/**
-		Enable this if you want to call ```` when a value is changed.
-		*/
-		public static var syncOnChange = false
-
-		/**
-		Enable this if you want to debug the syncing status of keys.
-		Logs will be printed to the console in OSLog format.
-
-		- Note: The log information will include details such as the key being synced, its corresponding value, and the status of the synchronization.
-		*/
-		public static var isDebug = false
-
-		/**
-		Add the keys to be automatically synced.
-		*/
-		public static func add(_ keys: Defaults.Keys...) {
-			synchronizer.add(keys)
-		}
-
-		/**
-		Add the keys to be automatically synced.
-		*/
-		public static func add(_ keys: [Defaults.Keys]) {
-			synchronizer.add(keys)
-		}
-
-		/**
-		Remove the keys that are set to be automatically synced.
-		*/
-		public static func remove(_ keys: Defaults.Keys...) {
-			synchronizer.remove(keys)
-		}
-
-		/**
-		Remove the keys that are set to be automatically synced.
-		*/
-		public static func remove(_ keys: [Defaults.Keys]) {
-			synchronizer.remove(keys)
-		}
-
-		/**
-		Remove all keys that are set to be automatically synced.
-		*/
-		public static func removeAll() {
-			synchronizer.removeAll()
-		}
-
-		/**
-		Explicitly synchronizes in-memory keys and values with those stored on disk.
-
-		As per apple docs, the only recommended time to call this method is upon app launch, or upon returning to the foreground, to ensure that the in-memory key-value store representation is up-to-date.
-		*/
-		public static func synchronize() {
-			synchronizer.synchronize()
-		}
-
-		/**
-		Wait until synchronization is complete.
-		*/
-		public static func sync() async {
-			await synchronizer.sync()
-		}
-
-		/**
-		Create synchronization tasks for all the keys that have been added to the ``Defaults/Defaults/iCloud``.
-		*/
-		public static func syncWithoutWaiting() {
-			synchronizer.syncWithoutWaiting()
-		}
-
-		/**
-		Create synchronization tasks for the specified `keys` from the given source, which can be either a remote server or a local cache.
-
-		- Parameter keys: The keys that should be synced.
-		- Parameter source: Sync keys from which data source(remote or local)
-
-		- Note: `source` should be specified if `key` has not been added to ``Defaults/Defaults/iCloud``.
-		*/
-		public static func syncWithoutWaiting(_ keys: Defaults.Keys..., source: DataSource? = nil) {
-			synchronizer.syncWithoutWaiting(keys, source)
-		}
-
-		/**
-		Create synchronization tasks for the specified `keys` from the given source, which can be either a remote server or a local cache.
-
-		- Parameter keys: The keys that should be synced.
-		- Parameter source: Sync keys from which data source(remote or local)
-
-		- Note: `source` should be specified if `key` has not been added to ``Defaults/Defaults/iCloud``.
-		*/
-		public static func syncWithoutWaiting(_ keys: [Defaults.Keys], source: DataSource? = nil) {
-			synchronizer.syncWithoutWaiting(keys, source)
-		}
 	}
 }

Sources/Defaults/Defaults.swift

@@ -67,6 +67,8 @@ extension Defaults {
 			suite.removeObject(forKey: name)
 		}
 	}
+
+	public typealias Keys = _AnyKey
 }
 
 extension Defaults {
@@ -85,7 +87,7 @@ extension Defaults {
 	}
 	```
 
-	- Warning: The `UserDefaults` name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
+	- Important: The `UserDefaults` name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
 	*/
 	public final class Key<Value: Serializable>: _AnyKey {
 		/**
@@ -103,7 +105,7 @@ extension Defaults {
 		Create a key.
 
 		- Parameter name: The name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
-		- Parameter iCloud: Automatically synchronize the value with ``Defaults/Defaults/iCloud``.
+		- Parameter iCloud: Automatically synchronize the value with ``Defaults/iCloud``.
 
 		The `default` parameter should not be used if the `Value` type is an optional.
 		*/
@@ -148,7 +150,7 @@ extension Defaults {
 		```
 
 		- Parameter name: The name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
-		- Parameter iCloud: Automatically synchronize the value with ``Defaults/Defaults/iCloud``.
+		- Parameter iCloud: Automatically synchronize the value with ``Defaults/iCloud``.
 
 		- Note: This initializer will not set the default value in the actual `UserDefaults`. This should not matter much though. It's only really useful if you use legacy KVO bindings.
 		*/
@@ -176,7 +178,7 @@ extension Defaults.Key {
 	Create a key with an optional value.
 
 	- Parameter name: The name must be ASCII, not start with `@`, and cannot contain a dot (`.`).
-	- Parameter iCloud: Automatically synchronize the value with ``Defaults/Defaults/iCloud``.
+	- Parameter iCloud: Automatically synchronize the value with ``Defaults/iCloud``.
 	*/
 	public convenience init<T>(
 		_ name: String,
@@ -212,112 +214,6 @@ extension Defaults._AnyKey: Hashable {
 	}
 }
 
-extension Defaults {
-	public typealias Keys = _AnyKey
-
-	/**
-	Types that conform to this protocol can be used with `Defaults`.
-
-	The type should have a static variable `bridge` which should reference an instance of a type that conforms to `Defaults.Bridge`.
-
-	```swift
-	struct User {
-		username: String
-		password: String
-	}
-
-	extension User: Defaults.Serializable {
-		static let bridge = UserBridge()
-	}
-	```
-	*/
-	public typealias Serializable = _DefaultsSerializable
-
-	public typealias CollectionSerializable = _DefaultsCollectionSerializable
-	public typealias SetAlgebraSerializable = _DefaultsSetAlgebraSerializable
-
-	/**
-	Ambiguous bridge selector protocol that lets you select your preferred bridge when there are multiple possibilities.
-
-	```swift
-	enum Interval: Int, Codable, Defaults.Serializable, Defaults.PreferRawRepresentable {
-		case tenMinutes = 10
-		case halfHour = 30
-		case oneHour = 60
-	}
-	```
-
-	By default, if an `enum` conforms to `Codable` and `Defaults.Serializable`, it will use the `CodableBridge`, but by conforming to `Defaults.PreferRawRepresentable`, we can switch the bridge back to `RawRepresentableBridge`.
-	*/
-	public typealias PreferRawRepresentable = _DefaultsPreferRawRepresentable
-
-	/**
-	Ambiguous bridge selector protocol that lets you select your preferred bridge when there are multiple possibilities.
-	*/
-	public typealias PreferNSSecureCoding = _DefaultsPreferNSSecureCoding
-
-	/**
-	A `Bridge` is responsible for serialization and deserialization.
-
-	It has two associated types `Value` and `Serializable`.
-
-	- `Value`: The type you want to use.
-	- `Serializable`: The type stored in `UserDefaults`.
-	- `serialize`: Executed before storing to the `UserDefaults` .
-	- `deserialize`: Executed after retrieving its value from the `UserDefaults`.
-
-	```swift
-	struct User {
-		username: String
-		password: String
-	}
-
-	extension User {
-		static let bridge = UserBridge()
-	}
-
-	struct UserBridge: Defaults.Bridge {
-		typealias Value = User
-		typealias Serializable = [String: String]
-
-		func serialize(_ value: Value?) -> Serializable? {
-			guard let value else {
-				return nil
-			}
-
-			return [
-				"username": value.username,
-				"password": value.password
-			]
-		}
-
-		func deserialize(_ object: Serializable?) -> Value? {
-			guard
-				let object,
-				let username = object["username"],
-				let password = object["password"]
-			else {
-				return nil
-			}
-
-			return User(
-				username: username,
-				password: password
-			)
-		}
-	}
-	```
-	*/
-	public typealias Bridge = _DefaultsBridge
-
-	public typealias RangeSerializable = _DefaultsRange & _DefaultsSerializable
-
-	/**
-	Convenience protocol for `Codable`.
-	*/
-	typealias CodableBridge = _DefaultsCodableBridge
-}
-
 extension Defaults {
 	/**
 	Observe updates to a stored value.
@@ -371,7 +267,7 @@ extension Defaults {
 	}
 	```
 
-	- Note: This does not include which of the values changed. Use ``Defaults/updates(_:initial:)-9eh8`` if you need that. You could use [`merge`](https://github.com/apple/swift-async-algorithms/blob/main/Sources/AsyncAlgorithms/AsyncAlgorithms.docc/Guides/Merge.md) to merge them into a single sequence.
+	- Note: This does not include which of the values changed. Use ``Defaults/updates(_:initial:)-88orv`` if you need that. You could use [`merge`](https://github.com/apple/swift-async-algorithms/blob/main/Sources/AsyncAlgorithms/AsyncAlgorithms.docc/Guides/Merge.md) to merge them into a single sequence.
 	*/
 	public static func updates(
 		_ keys: [_AnyKey],

Sources/Defaults/Documentation.docc/Documentation.md

@@ -51,7 +51,7 @@ typealias Default = _Default
 
 ### Methods
 
-- ``Defaults/updates(_:initial:)-9eh8``
+- ``Defaults/updates(_:initial:)-88orv``
 - ``Defaults/updates(_:initial:)-1mqkb``
 - ``Defaults/reset(_:)-7jv5v``
 - ``Defaults/reset(_:)-7es1e``

Sources/Defaults/Observation+Combine.swift

@@ -84,7 +84,7 @@ extension Defaults {
 	}
 	```
 
-	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-9eh8`` instead.
+	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-88orv`` instead.
 	*/
 	public static func publisher<Value: Serializable>(
 		_ key: Key<Value>,
@@ -99,7 +99,7 @@ extension Defaults {
 	/**
 	Publisher for multiple `Key<T>` observation, but without specific information about changes.
 
-	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-9eh8`` instead.
+	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-88orv`` instead.
 	*/
 	public static func publisher(
 		keys: [_AnyKey],
@@ -122,7 +122,7 @@ extension Defaults {
 	/**
 	Publisher for multiple `Key<T>` observation, but without specific information about changes.
 
-	 - Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-9eh8`` instead.
+	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-88orv`` instead.
 	*/
 	public static func publisher(
 		keys: _AnyKey...,

Sources/Defaults/Observation.swift

@@ -391,7 +391,7 @@ extension Defaults {
 	}
 	```
 
-	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-9eh8`` instead.
+	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-88orv`` instead.
 	*/
 	public static func observe<Value: Serializable>(
 		_ key: Key<Value>,
@@ -407,7 +407,6 @@ extension Defaults {
 		return observation
 	}
 
-
 	/**
 	Observe multiple keys of any type, but without any information about the changes.
 
@@ -422,7 +421,7 @@ extension Defaults {
 	}
 	```
 
-	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-9eh8`` instead.
+	- Warning: This method exists for backwards compatibility and will be deprecated sometime in the future. Use ``Defaults/updates(_:initial:)-88orv`` instead.
 	*/
 	public static func observe(
 		keys: _AnyKey...,

Sources/Defaults/Utilities.swift

@@ -235,13 +235,14 @@ extension Defaults.Serializable {
 	}
 }
 
+// TODO: Remove this in favor of `MutexLock` when targeting Swift 6.
 // swiftlint:disable:next final_class
 class Lock: DefaultsLockProtocol {
 	final class UnfairLock: Lock {
 		private let _lock: os_unfair_lock_t
 
 		override init() {
-			_lock = .allocate(capacity: 1)
+			self._lock = .allocate(capacity: 1)
 			_lock.initialize(to: os_unfair_lock())
 		}
 
@@ -360,13 +361,12 @@ final class TaskQueue {
 				queueContinuation?.yield {
 					continuation.resume()
 				}
-				return
 			}
 		}
 	}
 }
 
-// TODO: replace with Swift 6 native Atomics support.
+// TODO: Replace with Swift 6 native Atomics support: https://github.com/apple/swift-evolution/blob/main/proposals/0258-property-wrappers.md?rgh-link-date=2024-03-29T14%3A14%3A00Z#changes-from-the-accepted-proposal
 @propertyWrapper
 final class Atomic<Value> {
 	private let lock: Lock = .make()

Tests/DefaultsTests/Defaults+iCloudTests.swift

@@ -83,7 +83,7 @@ final class DefaultsICloudTests: XCTestCase {
 		Defaults.removeAll()
 	}
 
-	private func updateMockStorage<T>(key: String, value: T, _ date: Date? = nil) {
+	private func updateMockStorage(key: String, value: some Any, _ date: Date? = nil) {
 		mockStorage.set([date ?? Date(), value], forKey: key)
 	}
 
@@ -93,7 +93,7 @@ final class DefaultsICloudTests: XCTestCase {
 		let quality = Defaults.Key<Double>("testICloudInitialize_quality", default: 0.0, iCloud: true)
 
 		print(Defaults.iCloud.keys)
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "0")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 0.0)
 		let name_expected = ["1", "2", "3", "4", "5", "6", "7"]
@@ -102,7 +102,7 @@ final class DefaultsICloudTests: XCTestCase {
 		for index in 0..<name_expected.count {
 			Defaults[name] = name_expected[index]
 			Defaults[quality] = quality_expected[index]
-			await Defaults.iCloud.sync()
+			await Defaults.iCloud.waitForSyncCompletion()
 			XCTAssertEqual(mockStorage.data(forKey: name.name), name_expected[index])
 			XCTAssertEqual(mockStorage.data(forKey: quality.name), quality_expected[index])
 		}
@@ -110,20 +110,20 @@ final class DefaultsICloudTests: XCTestCase {
 		updateMockStorage(key: quality.name, value: 8.0)
 		updateMockStorage(key: name.name, value: "8")
 		mockStorage.synchronize()
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(Defaults[quality], 8.0)
 		XCTAssertEqual(Defaults[name], "8")
 
 		Defaults[name] = "9"
 		Defaults[quality] = 9.0
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "9")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 9.0)
 
 		updateMockStorage(key: quality.name, value: 10)
 		updateMockStorage(key: name.name, value: "10")
 		mockStorage.synchronize()
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(Defaults[quality], 10.0)
 		XCTAssertEqual(Defaults[name], "10")
 	}
@@ -133,7 +133,7 @@ final class DefaultsICloudTests: XCTestCase {
 		updateMockStorage(key: "testDidChangeExternallyNotification_quality", value: 0.0)
 		let name = Defaults.Key<String?>("testDidChangeExternallyNotification_name", iCloud: true)
 		let quality = Defaults.Key<Double?>("testDidChangeExternallyNotification_quality", iCloud: true)
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(Defaults[name], "0")
 		XCTAssertEqual(Defaults[quality], 0.0)
 		let name_expected = ["1", "2", "3", "4", "5", "6", "7"]
@@ -144,19 +144,19 @@ final class DefaultsICloudTests: XCTestCase {
 			updateMockStorage(key: quality.name, value: quality_expected[index])
 			mockStorage.synchronize()
 		}
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(Defaults[name], "7")
 		XCTAssertEqual(Defaults[quality], 7.0)
 
 		Defaults[name] = "8"
 		Defaults[quality] = 8.0
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "8")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 8.0)
 
 		Defaults[name] = nil
 		Defaults[quality] = nil
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertNil(mockStorage.data(forKey: name.name))
 		XCTAssertNil(mockStorage.data(forKey: quality.name))
 	}
@@ -174,7 +174,7 @@ final class DefaultsICloudTests: XCTestCase {
 			XCTAssertEqual(Defaults[quality], quality_expected[index])
 		}
 
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "7")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 7.0)
 	}
@@ -184,14 +184,14 @@ final class DefaultsICloudTests: XCTestCase {
 		let quality = Defaults.Key<Double>("testRemoveKey_quality", default: 0.0, iCloud: true)
 		Defaults[name] = "1"
 		Defaults[quality] = 1.0
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "1")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 1.0)
 
 		Defaults.iCloud.remove(quality)
 		Defaults[name] = "2"
 		Defaults[quality] = 1.0
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "2")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 1.0)
 	}
@@ -206,7 +206,7 @@ final class DefaultsICloudTests: XCTestCase {
 			Defaults[name] = name_expected[index]
 			Defaults[quality] = quality_expected[index]
 			Defaults.iCloud.syncWithoutWaiting(name, quality, source: .local)
-			await Defaults.iCloud.sync()
+			await Defaults.iCloud.waitForSyncCompletion()
 			XCTAssertEqual(mockStorage.data(forKey: name.name), name_expected[index])
 			XCTAssertEqual(mockStorage.data(forKey: quality.name), quality_expected[index])
 		}
@@ -214,7 +214,7 @@ final class DefaultsICloudTests: XCTestCase {
 		updateMockStorage(key: name.name, value: "8")
 		updateMockStorage(key: quality.name, value: 8)
 		Defaults.iCloud.syncWithoutWaiting(name, quality, source: .remote)
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(Defaults[quality], 8.0)
 		XCTAssertEqual(Defaults[name], "8")
 	}
@@ -229,7 +229,7 @@ final class DefaultsICloudTests: XCTestCase {
 			updateMockStorage(key: name.name, value: name_expected[index])
 			updateMockStorage(key: quality.name, value: quality_expected[index])
 			Defaults.iCloud.syncWithoutWaiting(name, quality, source: .remote)
-			await Defaults.iCloud.sync()
+			await Defaults.iCloud.waitForSyncCompletion()
 			XCTAssertEqual(Defaults[name], name_expected[index])
 			XCTAssertEqual(Defaults[quality], quality_expected[index])
 		}
@@ -237,14 +237,14 @@ final class DefaultsICloudTests: XCTestCase {
 		Defaults[name] = "8"
 		Defaults[quality] = 8.0
 		Defaults.iCloud.syncWithoutWaiting(name, quality, source: .local)
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "8")
 		XCTAssertEqual(mockStorage.data(forKey: quality.name), 8.0)
 
 		Defaults[name] = nil
 		Defaults[quality] = nil
 		Defaults.iCloud.syncWithoutWaiting(name, quality, source: .local)
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertNil(mockStorage.object(forKey: name.name))
 		XCTAssertNil(mockStorage.object(forKey: quality.name))
 	}
@@ -254,12 +254,12 @@ final class DefaultsICloudTests: XCTestCase {
 		let task = Task.detached {
 			Defaults.iCloud.add(name)
 			Defaults.iCloud.syncWithoutWaiting()
-			await Defaults.iCloud.sync()
+			await Defaults.iCloud.waitForSyncCompletion()
 		}
 		await task.value
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "0")
 		Defaults[name] = "1"
-		await Defaults.iCloud.sync()
+		await Defaults.iCloud.waitForSyncCompletion()
 		XCTAssertEqual(mockStorage.data(forKey: name.name), "1")
 	}
 
@@ -267,7 +267,7 @@ final class DefaultsICloudTests: XCTestCase {
 		let task = Task.detached {
 			let name = Defaults.Key<String>("testICloudInitializeFromDetached_name", default: "0", iCloud: true)
 
-			await Defaults.iCloud.sync()
+			await Defaults.iCloud.waitForSyncCompletion()
 			XCTAssertEqual(mockStorage.data(forKey: name.name), "0")
 		}
 		await task.value

Tests/DefaultsTests/DefaultsNSSecureCodingTests.swift

@@ -350,8 +350,8 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 				}
 			}
 
-		inputArray.forEach {
+		for item in inputArray {
-			Defaults[key] = ExamplePersistentHistory(value: $0)
+			Defaults[key] = ExamplePersistentHistory(value: item)
 		}
 
 		Defaults.reset(key)
@@ -383,8 +383,8 @@ final class DefaultsNSSecureCodingTests: XCTestCase {
 				}
 			}
 
-		inputArray.forEach {
+		for item in inputArray {
-			Defaults[key] = ExamplePersistentHistory(value: $0)
+			Defaults[key] = ExamplePersistentHistory(value: item)
 		}
 
 		Defaults.reset(key)

Tests/DefaultsTests/DefaultsTests.swift

@@ -593,8 +593,8 @@ final class DefaultsTests: XCTestCase {
 				}
 			}
 
-		inputArray.forEach {
+		for item in inputArray {
-			Defaults[key] = $0
+			Defaults[key] = item
 		}
 
 		Defaults.reset(key)
@@ -625,8 +625,8 @@ final class DefaultsTests: XCTestCase {
 				}
 			}
 
-		inputArray.forEach {
+		for item in inputArray {
-			Defaults[key] = $0
+			Defaults[key] = item
 		}
 
 		Defaults.reset(key)

readme.md

@@ -34,7 +34,7 @@ It's used in production by [all my apps](https://sindresorhus.com/apps) (1 milli
 - macOS 11+
 - iOS 14+
 - tvOS 14+
-- watchOS 7+
+- watchOS 9+
 - visionOS 1+
 
 ## Install