1 files changed, 18 insertions, 0 deletions

diff --git a/src/tools/heat/Extensibility/IMutatorExtension.cs b/src/tools/heat/Extensibility/IMutatorExtension.cs
new file mode 100644
index 00000000..b81f586e
--- /dev/null
+++ b/src/tools/heat/Extensibility/IMutatorExtension.cs
@@ -0,0 +1,18 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Harvesters.Extensibility
+{
+    using Wix = WixToolset.Harvesters.Serialize;
+
+#pragma warning disable 1591 // TODO: add documentation
+    public interface IMutatorExtension
+    {
+        IHarvesterCore Core { get; set; }
+
+        int Sequence { get; }
+
+        void Mutate(Wix.Wix wix);
+
+        string Mutate(string wixString);
+    }
+}