1 files changed, 25 insertions, 0 deletions

diff --git a/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs b/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs
new file mode 100644
index 00000000..df3a7e6a
--- /dev/null
+++ b/src/WixToolset.Core/Preprocess/ResolvedVariableEventHandler.cs
@@ -0,0 +1,25 @@
+// 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.Core.Preprocess
+{
+    using System;
+    using WixToolset.Data;
+
+    public delegate void ResolvedVariableEventHandler(object sender, ResolvedVariableEventArgs e);
+
+    public class ResolvedVariableEventArgs : EventArgs
+    {
+        public ResolvedVariableEventArgs(SourceLineNumber sourceLineNumbers, string variableName, string variableValue)
+        {
+            this.SourceLineNumbers = sourceLineNumbers;
+            this.VariableName = variableName;
+            this.VariableValue = variableValue;
+        }
+
+        public SourceLineNumber SourceLineNumbers { get; }
+
+        public string VariableName { get; }
+
+        public string VariableValue { get; }
+    }
+}