From cf0e79a02f8030d791d237bb781311cf48e0d355 Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Thu, 28 Jan 2016 16:07:06 -0800
Subject: [PATCH] Add explicit `return undefined;`

(cherry picked from commit 1f503f1b27fb52ee5dacd75bd9379908ce6ee68e)
---
 src/compiler/checker.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 446f426e6d3..a7ebc36c7f3 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10359,6 +10359,8 @@ namespace ts {
             if (returnTag && returnTag.typeExpression) {
                 return getTypeFromTypeNode(returnTag.typeExpression.type);
             }
+            
+            return undefined;
         }
 
         function createPromiseType(promisedType: Type): Type {