From a60a6f311ff53dd46292710f333b5a9f8244dbea Mon Sep 17 00:00:00 2001
From: Nicolas DUBIEN <github@dubien.org>
Date: Tue, 5 Mar 2019 13:03:57 +0100
Subject: [PATCH] Better typings of Object.keys when keys coming from enum

---
 lib/lib.es5.d.ts | 6 ++++++
 src/lib/es5.d.ts | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/lib.es5.d.ts b/lib/lib.es5.d.ts
index dda476e4e3957..5d3591ae40282 100644
--- a/lib/lib.es5.d.ts
+++ b/lib/lib.es5.d.ts
@@ -254,6 +254,12 @@ interface ObjectConstructor {
       */
     isExtensible(o: any): boolean;
 
+    /**
+      * Returns the names of the enumerable properties and methods of an object.
+      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
+      */
+    keys<EnumType extends string>(o: { [K in EnumType]: any }): EnumType[];
+
     /**
       * Returns the names of the enumerable properties and methods of an object.
       * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 4112f5a2ae7d7..28dea0bb371f7 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -234,6 +234,12 @@ interface ObjectConstructor {
       */
     isExtensible(o: any): boolean;
 
+    /**
+      * Returns the names of the enumerable properties and methods of an object.
+      * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
+      */
+    keys<EnumType extends string>(o: { [K in EnumType]: any }): EnumType[];
+
     /**
       * Returns the names of the enumerable properties and methods of an object.
       * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.