From e8f42c4a7bf1a7333f8ee62d0496b35d622e5709 Mon Sep 17 00:00:00 2001
From: Klaus Meinhardt <klaus.meinhardt1@gmail.com>
Date: Fri, 2 Jun 2017 19:09:36 +0200
Subject: [PATCH] Make tokenToString return string|undefined (#16106)

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

diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 0a072a3b8ac..68a36c40a80 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -286,7 +286,7 @@ namespace ts {
 
     const tokenStrings = makeReverseMap(textToToken);
 
-    export function tokenToString(t: SyntaxKind): string {
+    export function tokenToString(t: SyntaxKind): string | undefined {
         return tokenStrings[t];
     }