diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index fe183c5e80..84c28abe1a 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -71,6 +71,15 @@ namespace ts {
         return clone;
     }
 
+    /**
+     * Creates a deep, memberwise clone of a node with no source map location.
+     */
+    export function getSynthesizedDeepClone<T extends Node>(node: T | undefined): T | undefined {
+        return node
+            ? getSynthesizedClone(visitEachChild(node, child => getSynthesizedDeepClone(child), nullTransformationContext))
+            : undefined;
+    }
+
     // Literals
 
     export function createLiteral(value: string): StringLiteral;