From de313ff1bd11daf484aa421a5d9fde954b8e6fc7 Mon Sep 17 00:00:00 2001
From: Alex Chugaev <achugaev93@gmail.com>
Date: Thu, 7 Sep 2017 20:58:05 +0300
Subject: [PATCH] Object.getOwnPropertyDescriptor() returns 'undefined' if
 property descriptor not found. (#18148)

---
 src/lib/es2015.core.d.ts    | 2 +-
 src/lib/es2015.reflect.d.ts | 2 +-
 src/lib/es5.d.ts            | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
index 0deef59a47d..42d3d1543a0 100644
--- a/src/lib/es2015.core.d.ts
+++ b/src/lib/es2015.core.d.ts
@@ -327,7 +327,7 @@ interface ObjectConstructor {
      * @param o Object that contains the property.
      * @param p Name of the property.
      */
-    getOwnPropertyDescriptor(o: any, propertyKey: PropertyKey): PropertyDescriptor;
+    getOwnPropertyDescriptor(o: any, propertyKey: PropertyKey): PropertyDescriptor | undefined;
 
     /**
      * Adds a property to an object, or modifies attributes of an existing property.
diff --git a/src/lib/es2015.reflect.d.ts b/src/lib/es2015.reflect.d.ts
index 83755e4c791..aab3da993dc 100644
--- a/src/lib/es2015.reflect.d.ts
+++ b/src/lib/es2015.reflect.d.ts
@@ -4,7 +4,7 @@ declare namespace Reflect {
     function defineProperty(target: object, propertyKey: PropertyKey, attributes: PropertyDescriptor): boolean;
     function deleteProperty(target: object, propertyKey: PropertyKey): boolean;
     function get(target: object, propertyKey: PropertyKey, receiver?: any): any;
-    function getOwnPropertyDescriptor(target: object, propertyKey: PropertyKey): PropertyDescriptor;
+    function getOwnPropertyDescriptor(target: object, propertyKey: PropertyKey): PropertyDescriptor | undefined;
     function getPrototypeOf(target: object): object;
     function has(target: object, propertyKey: PropertyKey): boolean;
     function isExtensible(target: object): boolean;
diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 4dae997ffb4..6033a8fd989 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -127,7 +127,7 @@ interface ObjectConstructor {
       * @param o Object that contains the property.
       * @param p Name of the property.
     */
-    getOwnPropertyDescriptor(o: any, p: string): PropertyDescriptor;
+    getOwnPropertyDescriptor(o: any, p: string): PropertyDescriptor | undefined;
 
     /**
       * Returns the names of the own properties of an object. The own properties of an object are those that are defined directly