fiexd module error

packages/app/src/server/models/activity.ts

@@ -12,7 +12,7 @@ import { InAppNotification } from './in-app-notification';
 
 import ActivityEvent from '../events/activity';
 
-const InAppNotificationService = require('../service/in-app-notification');
+// const InAppNotificationService = require('../service/in-app-notification');
 
 const logger = loggerFactory('growi:models:activity');
 

packages/app/src/server/service/in-app-notification.ts

@@ -1,7 +1,7 @@
 import Crowi from '../crowi';
 import { InAppNotification } from '~/server/models/in-app-notification';
 
-export default class InAppNotificationService {
+class InAppNotificationService {
 
   crowi!: any;
 
@@ -47,3 +47,5 @@ export default class InAppNotificationService {
   };
 
 }
+
+module.exports = InAppNotificationService;