From 3cfb266458c7bc4d05625b436164915ed494dd64 Mon Sep 17 00:00:00 2001
From: Matej Matiasko <matej.matiasko@gmail.com>
Date: Fri, 10 Mar 2017 23:52:32 +0100
Subject: [PATCH] Make success callback possible - cors (#14849)

---
 cors/index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cors/index.d.ts b/cors/index.d.ts
index ecad80d187..6c1fc3e4c3 100644
--- a/cors/index.d.ts
+++ b/cors/index.d.ts
@@ -10,7 +10,7 @@ import express = require('express');
 
 type CustomOrigin = (
     requestOrigin: string,
-    callback: (err: Error, allow?: boolean) => void
+    callback: (err: Error | null, allow?: boolean) => void
 ) => void;
 
 declare namespace e {