code optimize

src/background/caches.ts

@@ -1,4 +1,4 @@
-import { logger } from "./common";
+import { logger } from "./logger";
 import { Actions } from "../common";
 import { messageSubscribers } from "./messaging";
 
@@ -26,4 +26,6 @@ export class Caches {
             }
         }, 30000);
     }
-}
+}
+
+export const caches = new Caches();