From 380b8df13f3ff9deaf36c6a7aa3ae0c7fd4ce960 Mon Sep 17 00:00:00 2001
From: Andrew Casey <andrew.casey@microsoft.com>
Date: Thu, 5 Oct 2017 15:38:02 -0700
Subject: [PATCH] Introduce getSynthesizedDeepClone

---
 src/compiler/factory.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index fe183c5e806..84c28abe1a5 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;