1 files changed, 27 insertions, 0 deletions

diff --git a/src/WixToolset.Mba.Core/IVariables.cs b/src/WixToolset.Mba.Core/IVariables.cs
new file mode 100644
index 00000000..15da4c84
--- /dev/null
+++ b/src/WixToolset.Mba.Core/IVariables.cs
@@ -0,0 +1,27 @@
+// 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.BootstrapperCore
+{
+    using System;
+
+    /// <summary>
+    /// An accessor for numeric, string, and version variables for the engine.
+    /// </summary>
+    public interface IVariables<T>
+    {
+        /// <summary>
+        /// Gets or sets the variable given by <paramref name="name"/>.
+        /// </summary>
+        /// <param name="name">The name of the variable to get/set.</param>
+        /// <returns>The value of the given variable.</returns>
+        /// <exception cref="Exception">An error occurred getting the variable.</exception>
+        T this[string name] { get; set; }
+
+        /// <summary>
+        /// Gets whether the variable given by <paramref name="name"/> exists.
+        /// </summary>
+        /// <param name="name">The name of the variable to check.</param>
+        /// <returns>True if the variable given by <paramref name="name"/> exists; otherwise, false.</returns>
+        bool Contains(string name);
+    }
+}