From bc3376e05cdc56f089b81f3055be9e3dd7bf71f5 Mon Sep 17 00:00:00 2001
From: Camden Narzt <heartwork@narzt.cam>
Date: Thu, 10 Mar 2022 18:43:00 -0700
Subject: [PATCH] add type labels

---
 src/mock-doc/window.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mock-doc/window.ts b/src/mock-doc/window.ts
index 5985dc858a14..117b90252f55 100644
--- a/src/mock-doc/window.ts
+++ b/src/mock-doc/window.ts
@@ -337,14 +337,14 @@ export class MockWindow {
     }
   }
 
-  matchMedia(media) {
+  matchMedia(media: string) {
     return {
       media,
       matches: false,
       addEventListener,
       dispatchEvent,
       removeEventListener,
-      onchange: null,
+      onchange: null as (this: MediaQueryList, ev: MediaQueryListEvent) => any,
     };
   }