From c154b81986ad32d20ae1d8aaefe5126776c933bf Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Mon, 26 Feb 2018 13:52:09 -0800
Subject: [PATCH] Ensure our readonly emptyArray stays non modified.

---
 src/compiler/factory.ts | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index 92d353aeb0efa..af26ad8337ad8 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -24,14 +24,14 @@ namespace ts {
      * Make `elements` into a `NodeArray<T>`. If `elements` is `undefined`, returns an empty `NodeArray<T>`.
      */
     export function createNodeArray<T extends Node>(elements?: ReadonlyArray<T>, hasTrailingComma?: boolean): NodeArray<T> {
-        if (elements) {
+        if (!elements || elements === emptyArray) {
+            elements = [];
+        }
+        else {
             if (isNodeArray(elements)) {
                 return elements;
             }
         }
-        else {
-            elements = [];
-        }
 
         const array = <NodeArray<T>>elements;
         array.pos = -1;