From 2cc1d735ec1bb725fce914d101b256108c530ad5 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Tue, 13 Feb 2018 06:47:52 -0800
Subject: [PATCH] Add Required<T> to lib.d.ts

---
 src/lib/es5.d.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 0f773e78786..bab3bc67d38 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -1317,6 +1317,13 @@ type Partial<T> = {
     [P in keyof T]?: T[P];
 };
 
+/**
+ * Make all properties in T required
+ */
+type Required<T> = {
+    [P in keyof T]-?: T[P];
+};
+
 /**
  * Make all properties in T readonly
  */