Add protocols for dependencies

Sources/AppState/Application/Types/Helper/FileManaging.swift

@@ -0,0 +1,32 @@
+/// A protocol that provides methods for reading, writing, and deleting files in a type-safe, sendable manner.
+public protocol FileManaging: Sendable {
+
+    /// Reads a file from the given path and decodes its contents into the specified type.
+    /// - Parameters:
+    ///   - path: The directory path where the file is located. Defaults to the current directory `"."`.
+    ///   - filename: The name of the file to read.
+    /// - Returns: The decoded value of the file's content as the specified type.
+    /// - Throws: An error if the file cannot be found or decoded.
+    func `in`<Value: Decodable>(path: String, filename: String) throws -> Value
+
+    /// Encodes and writes the given value to a file at the specified path.
+    /// - Parameters:
+    ///   - value: The value to encode and write to the file. It must conform to `Encodable`.
+    ///   - path: The directory path where the file will be written. Defaults to the current directory `"."`.
+    ///   - filename: The name of the file to write.
+    ///   - base64Encoded: Whether to encode the content as Base64. Defaults to `true`.
+    /// - Throws: An error if the file cannot be written.
+    func `out`<Value: Encodable>(_ value: Value, path: String, filename: String, base64Encoded: Bool) throws
+
+    /// Deletes a file at the specified path.
+    /// - Parameters:
+    ///   - path: The directory path where the file is located. Defaults to the current directory `"."`.
+    ///   - filename: The name of the file to delete.
+    /// - Throws: An error if the file cannot be deleted.
+    func `delete`(path: String, filename: String) throws
+
+    /// Removes a file or directory at the specified path.
+    /// - Parameter path: The full path of the file or directory to remove.
+    /// - Throws: An error if the item cannot be removed.
+    func removeItem(atPath path: String) throws
+}

Sources/AppState/Application/Types/Helper/UbiquitousKeyValueStoreManaging.swift

@@ -0,0 +1,23 @@
+#if !os(Linux) && !os(Windows)
+import Foundation
+
+/// A protocol that provides a thread-safe interface for interacting with `NSUbiquitousKeyValueStore`,
+/// which synchronizes key-value data across the user's iCloud-enabled devices.
+public protocol UbiquitousKeyValueStoreManaging: Sendable {
+
+    /// Retrieves data stored in iCloud for the specified key.
+    /// - Parameter key: The key used to retrieve the associated data from the `NSUbiquitousKeyValueStore`.
+    /// - Returns: The `Data` object associated with the key, or `nil` if no data is found.
+    func data(forKey key: String) -> Data?
+
+    /// Sets a `Data` object for the specified key in iCloud's key-value store.
+    /// - Parameters:
+    ///   - value: The `Data` object to store. Pass `nil` to remove the data associated with the key.
+    ///   - key: The key with which to associate the data.
+    func set(_ value: Data?, forKey key: String)
+
+    /// Removes the value associated with the specified key from iCloud's key-value store.
+    /// - Parameter key: The key whose associated value should be removed.
+    func removeObject(forKey key: String)
+}
+#endif

Sources/AppState/Application/Types/Helper/UserDefaultsManaging.swift

@@ -0,0 +1,19 @@
+/// A protocol that provides a thread-safe interface for interacting with `UserDefaults`,
+/// allowing the storage, retrieval, and removal of user preferences and data.
+public protocol UserDefaultsManaging: Sendable {
+
+    /// Retrieves an object from `UserDefaults` for the given key.
+    /// - Parameter key: The key used to retrieve the associated value from `UserDefaults`.
+    /// - Returns: The value stored in `UserDefaults` for the given key, or `nil` if no value is associated with the key.
+    func object(forKey key: String) -> Any?
+
+    /// Removes the value associated with the specified key from `UserDefaults`.
+    /// - Parameter key: The key whose associated value should be removed.
+    func removeObject(forKey key: String)
+
+    /// Sets the value for the specified key in `UserDefaults`.
+    /// - Parameters:
+    ///   - value: The value to store in `UserDefaults`. Can be `nil` to remove the value associated with the key.
+    ///   - key: The key with which to associate the value.
+    func set(_ value: Any?, forKey key: String)
+}

Sources/AppState/Application/Types/State/Application+FileState.swift

@@ -2,29 +2,14 @@ import Foundation
 
 extension Application {
     /// A struct that provides methods for reading, writing, and deleting files in a type-safe, sendable manner.
-    /// This struct is marked as `Sendable`, allowing its methods to be used in concurrent code safely.
-    public struct SendableFileManager: Sendable {
-
-        /// Reads a file from the given path and decodes its contents into the specified type.
-        /// - Parameters:
-        ///   - path: The directory path where the file is located. Defaults to the current directory `"."`.
-        ///   - filename: The name of the file to read.
-        /// - Returns: The decoded value of the file's content as the specified type.
-        /// - Throws: An error if the file cannot be found or decoded.
+    public struct SendableFileManager: FileManaging {
         public func `in`<Value: Decodable>(
             path: String = ".",
             filename: String
         ) throws -> Value {
             try FileManager.default.in(path: path, filename: filename)
         }
 
-        /// Encodes and writes the given value to a file at the specified path.
-        /// - Parameters:
-        ///   - value: The value to encode and write to the file. It must conform to `Encodable`.
-        ///   - path: The directory path where the file will be written. Defaults to the current directory `"."`.
-        ///   - filename: The name of the file to write.
-        ///   - base64Encoded: Whether to encode the content as Base64. Defaults to `true`.
-        /// - Throws: An error if the file cannot be written.
         public func `out`<Value: Encodable>(
             _ value: Value,
             path: String = ".",
@@ -39,33 +24,25 @@ extension Application {
             )
         }
 
-        /// Deletes a file at the specified path.
-        /// - Parameters:
-        ///   - path: The directory path where the file is located. Defaults to the current directory `"."`.
-        ///   - filename: The name of the file to delete.
-        /// - Throws: An error if the file cannot be deleted.
         public func `delete`(path: String = ".", filename: String) throws {
             try FileManager.default.delete(path: path, filename: filename)
         }
 
-        /// Removes a file or directory at the specified path.
-        /// - Parameter path: The full path of the file or directory to remove.
-        /// - Throws: An error if the item cannot be removed.
         public func removeItem(atPath path: String) throws {
             try FileManager.default.removeItem(atPath: path)
         }
     }
 
     /// The shared `FileManager` instance.
-    public var fileManager: Dependency<SendableFileManager> {
+    public var fileManager: Dependency<FileManaging> {
         dependency(SendableFileManager())
     }
 
     /// `FileState` encapsulates the value within the application's scope and allows any changes to be propagated throughout the scoped area.  State is stored using `FileManager`.
     public struct FileState<Value: Codable & Sendable>: MutableApplicationState {
         public static var emoji: Character { "🗄️" }
 
-        @AppDependency(\.fileManager) private var fileManager: SendableFileManager
+        @AppDependency(\.fileManager) private var fileManager: FileManaging
 
         /// The initial value of the state.
         private var initial: () -> Value

Sources/AppState/Application/Types/State/Application+StoredState.swift

@@ -1,43 +1,31 @@
 import Foundation
 
 extension Application {
-    /// A struct that provides a thread-safe interface for interacting with `UserDefaults`, allowing the storage,
-    /// retrieval, and removal of user preferences and data. This struct is marked as `Sendable`, enabling safe
-    /// use in concurrent environments.
-    public struct SendableUserDefaults: Sendable {
-
-        /// Retrieves an object from `UserDefaults` for the given key.
-        /// - Parameter key: The key used to retrieve the associated value from `UserDefaults`.
-        /// - Returns: The value stored in `UserDefaults` for the given key, or `nil` if no value is associated with the key.
+    /// A struct that provides a thread-safe interface for interacting with `UserDefaults`, allowing the storage, retrieval, and removal of user preferences and data.
+    public struct SendableUserDefaults: UserDefaultsManaging {
         public func object(forKey key: String) -> Any? {
             UserDefaults.standard.object(forKey: key)
         }
 
-        /// Removes the value associated with the specified key from `UserDefaults`.
-        /// - Parameter key: The key whose associated value should be removed.
         public func removeObject(forKey key: String) {
             UserDefaults.standard.removeObject(forKey: key)
         }
 
-        /// Sets the value for the specified key in `UserDefaults`.
-        /// - Parameters:
-        ///   - value: The value to store in `UserDefaults`. Can be `nil` to remove the value associated with the key.
-        ///   - key: The key with which to associate the value.
         public func set(_ value: Any?, forKey key: String) {
             UserDefaults.standard.set(value, forKey: key)
         }
     }
 
     /// The shared `UserDefaults` instance.
-    public var userDefaults: Dependency<SendableUserDefaults> {
+    public var userDefaults: Dependency<UserDefaultsManaging> {
         dependency(SendableUserDefaults())
     }
 
     /// `StoredState` encapsulates the value within the application's scope and allows any changes to be propagated throughout the scoped area.  State is stored using `UserDefaults`.
     public struct StoredState<Value: Codable & Sendable>: MutableApplicationState {
         public static var emoji: Character { "💾" }
 
-        @AppDependency(\.userDefaults) private var userDefaults: SendableUserDefaults
+        @AppDependency(\.userDefaults) private var userDefaults: UserDefaultsManaging
 
         /// The initial value of the state.
         private var initial: () -> Value

Sources/AppState/Application/Types/State/Application+SyncState.swift

@@ -5,33 +5,20 @@ import Foundation
 extension Application {
     /// A struct that provides a thread-safe interface for interacting with `NSUbiquitousKeyValueStore`,
     /// which synchronizes small amounts of key-value data across the user's iCloud-enabled devices.
-    /// This struct is marked as `Sendable`, allowing for safe usage in concurrent environments.
-    public struct SendableNSUbiquitousKeyValueStore: Sendable {
-
-        /// Retrieves data stored in iCloud for the specified key.
-        /// - Parameter key: The key used to retrieve the associated data from the `NSUbiquitousKeyValueStore`.
-        /// - Returns: The `Data` object associated with the key, or `nil` if no data is found.
+    public struct SendableNSUbiquitousKeyValueStore: UbiquitousKeyValueStoreManaging {
         public func data(forKey key: String) -> Data? {
             NSUbiquitousKeyValueStore.default.data(forKey: key)
         }
-
-        /// Sets a `Data` object for the specified key in iCloud's key-value store.
-        /// - Parameters:
-        ///   - value: The `Data` object to store. Pass `nil` to remove the data associated with the key.
-        ///   - key: The key with which to associate the data.
         public func set(_ value: Data?, forKey key: String) {
             NSUbiquitousKeyValueStore.default.set(value, forKey: key)
         }
-
-        /// Removes the value associated with the specified key from iCloud's key-value store.
-        /// - Parameter key: The key whose associated value should be removed.
         public func removeObject(forKey key: String) {
             NSUbiquitousKeyValueStore.default.removeObject(forKey: key)
         }
     }
 
     /// The default `NSUbiquitousKeyValueStore` instance.
-    public var icloudStore: Dependency<SendableNSUbiquitousKeyValueStore> {
+    public var icloudStore: Dependency<UbiquitousKeyValueStoreManaging> {
         dependency {
             NotificationCenter.default.addObserver(
                 self,
@@ -63,7 +50,7 @@ extension Application {
     public struct SyncState<Value: Codable & Sendable>: MutableApplicationState {
         public static var emoji: Character { "☁️" }
 
-        @AppDependency(\.icloudStore) private var icloudStore: SendableNSUbiquitousKeyValueStore
+        @AppDependency(\.icloudStore) private var icloudStore: UbiquitousKeyValueStoreManaging
 
         /// The initial value of the state.
         private var initial: () -> Value