Implemented the "exists(at: )" function for the FileService service in the module target.

Sources/Library/Protocols/FileServicing.swift

@@ -1,9 +1,23 @@
 import Foundation
 
-protocol FileServicing {
+public protocol FileServicing {
     
-    // MARK: Properties
+    // MARK: Computed
     
     var currentFolder: URL { get async }
     
+    // MARK: Functions
+    
+    func exists(at url: URL) async throws (FileServiceError) -> Bool
+    
+}
+
+// MARK: - Errors
+
+public enum FileServiceError: Error, Equatable {
+    case folderNotCreated
+    case folderNotDeleted
+    case urlAlreadyExists
+    case urlNotExists
+    case urlNotFileURL
 }

Sources/Library/Services/FileService.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-struct FileService: FileServicing {
+public struct FileService: FileServicing {
 
     // MARK: Properties
     
@@ -8,19 +8,41 @@ struct FileService: FileServicing {
     
     // MARK: Initialisers
     
-    init(fileManager: FileManager = .default) {
+    public init(fileManager: FileManager = .default) {
         self.fileManager = fileManager
     }
     
     // MARK: Computed
     
-    var currentFolder: URL {
+    public var currentFolder: URL {
         get async {
-            if #available(macOS 13.0, *) {
-                .init(filePath: fileManager.currentDirectoryPath)
-            } else {
-                .init(fileURLWithPath: fileManager.currentDirectoryPath)
-            }
+            .init(at: fileManager.currentDirectoryPath)
+        }
+    }
+    
+    public func exists(at url: URL) async throws (FileServiceError) -> Bool {
+        guard url.isFileURL else {
+            throw FileServiceError.urlNotFileURL
+        }
+        
+        let filePath = getPath(for: url)
+        
+        return fileManager.fileExists(atPath: filePath)
+    }
+    
+}
+
+// MARK: - Helpers
+
+private extension FileService {
+    
+    // MARK: Functions
+    
+    func getPath(for url: URL) -> String {
+        if #available(macOS 13.0, *) {
+            return url.path()
+        } else {
+            return url.path
         }
     }