1 files changed, 36 insertions, 0 deletions

diff --git a/src/WixToolset.Core/Extensibility/IHeatCore.cs b/src/WixToolset.Core/Extensibility/IHeatCore.cs
new file mode 100644
index 00000000..bc853b24
--- /dev/null
+++ b/src/WixToolset.Core/Extensibility/IHeatCore.cs
@@ -0,0 +1,36 @@
+// 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.Extensibilty
+{
+    using WixToolset.Data;
+
+    /// <summary>
+    /// The WiX Toolset Harvester application core.
+    /// </summary>
+    public interface IHeatCore
+    {
+        /// <summary>
+        /// Gets whether the mutator core encountered an error while processing.
+        /// </summary>
+        /// <value>Flag if core encountered an error during processing.</value>
+        bool EncounteredError { get; }
+
+        /// <summary>
+        /// Gets the harvester.
+        /// </summary>
+        /// <value>The harvester.</value>
+        Harvester Harvester { get; }
+
+        /// <summary>
+        /// Gets the mutator.
+        /// </summary>
+        /// <value>The mutator.</value>
+        Mutator Mutator { get; }
+
+        /// <summary>
+        /// Sends a message to the message delegate if there is one.
+        /// </summary>
+        /// <param name="mea">Message event arguments.</param>
+        void OnMessage(MessageEventArgs mea);
+    }
+}