Updated code

src/Piral.Blazor.DevServer/PiralInstance.cs

@@ -1,8 +1,14 @@
 namespace Piral.Blazor.DevServer;
 
-public class PiralInstance(string name, bool website)
+public class PiralInstance
 {
-    public string Name { get; } = name;
+    public PiralInstance(string name, bool website)
+    {
+        Name = name;
+        IsWebsite = website;
+    }
 
-    public bool IsWebsite { get; } = website;
+    public string Name { get; }
+
+    public bool IsWebsite { get; }
 }

src/Piral.Blazor.Tools/tasks/ManagePiletTask.cs

@@ -208,7 +208,8 @@ private void InitializeNpmConfiguration()
             else if (!String.IsNullOrEmpty(registry))
             {
                 Log.LogMessage($"Creating '{configFileName}' with entry from NpmRegistry.");
-                File.AppendAllLines(Path.Combine(target, configFileName), [$"registry={registry}", "always-auth=true"], Encoding.UTF8);
+                var nl = Environment.NewLine;
+                File.AppendAllText(Path.Combine(target, configFileName), $"registry={registry}{nl}always-auth=true", Encoding.UTF8);
             }
         }