From c098a5cf83e7071dec2b5a3985d706fa43ad61b1 Mon Sep 17 00:00:00 2001
From: Arthur Ozga <arozga@microsoft.com>
Date: Thu, 16 Nov 2017 19:06:08 -0800
Subject: [PATCH] type `event` callback correctly

---
 src/server/server.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/server/server.ts b/src/server/server.ts
index 4a8ef0c1257..68bf4384f94 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -272,7 +272,7 @@ namespace ts.server {
             readonly typingSafeListLocation: string,
             readonly typesMapLocation: string,
             private readonly npmLocation: string | undefined,
-            private event: Event) {
+            private event: Event | undefined) {
         }
 
         isKnownTypesPackageName(name: string): boolean {