diff --git a/src/sw.ts b/src/sw.ts
index 419be534..ffc5c0e1 100644
--- a/src/sw.ts
+++ b/src/sw.ts
@@ -1,4 +1,5 @@
 /// <reference lib="WebWorker" />
+import { precacheAndRoute, cleanupOutdatedCaches } from 'workbox-precaching';
 
 export type {};
 declare const self: ServiceWorkerGlobalScope;