From f02ce1f6a02661da69aade37d9d167274c23dad4 Mon Sep 17 00:00:00 2001
From: Ron Buckton <rbuckton@microsoft.com>
Date: Wed, 1 Feb 2017 15:22:35 -0800
Subject: [PATCH] PR Feedback

---
 src/compiler/comments.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/comments.ts b/src/compiler/comments.ts
index f69b4c546a0..200158c2f5c 100644
--- a/src/compiler/comments.ts
+++ b/src/compiler/comments.ts
@@ -11,7 +11,7 @@ namespace ts {
         emitTrailingCommentsOfPosition(pos: number): void;
     }
 
-    export function createCommentWriter(printerOptions: PrinterOptions, emitPos: (pos: number) => void): CommentWriter {
+    export function createCommentWriter(printerOptions: PrinterOptions, emitPos: ((pos: number) => void) | undefined): CommentWriter {
         const extendedDiagnostics = printerOptions.extendedDiagnostics;
         const newLine = getNewLineCharacter(printerOptions);
         let writer: EmitTextWriter;