From 3062d36463cf4777932274e5633755fe8aaee536 Mon Sep 17 00:00:00 2001
From: Kanchalai Tanglertsampan <yuisu@microsoft.com>
Date: Tue, 13 Jun 2017 15:20:52 -0700
Subject: [PATCH] Add "undefined" as return type

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

diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 3833fc30875..fde03cc7db2 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -2721,11 +2721,11 @@ namespace ts {
      * Gets the effective type annotation of a variable, parameter, or property. If the node was
      * parsed in a JavaScript file, gets the type annotation from JSDoc.
      */
-    export function getEffectiveTypeAnnotationNode(node: VariableLikeDeclaration): TypeNode {
+    export function getEffectiveTypeAnnotationNode(node: VariableLikeDeclaration): TypeNode | undefined {
         if (node.type) {
             return node.type;
         }
-        if (node.flags & NodeFlags.JavaScriptFile) {
+        if (isInJavaScriptFile(node)) {
             return getJSDocType(node);
         }
     }
@@ -2734,11 +2734,11 @@ namespace ts {
      * Gets the effective return type annotation of a signature. If the node was parsed in a
      * JavaScript file, gets the return type annotation from JSDoc.
      */
-    export function getEffectiveReturnTypeNode(node: SignatureDeclaration): TypeNode {
+    export function getEffectiveReturnTypeNode(node: SignatureDeclaration): TypeNode | undefined {
         if (node.type) {
             return node.type;
         }
-        if (node.flags & NodeFlags.JavaScriptFile) {
+        if (isInJavaScriptFile(node)) {
             return getJSDocReturnType(node);
         }
     }