migrate to "export default"

also, set no-use-before-define in linter

src/backupintegrity.js

@@ -1,7 +1,7 @@
 import assert from 'assert';
 import backups from './backups.js';
-import * as backupFormats from './backupformats.js';
-import * as backupSites from './backupsites.js';
+import backupFormats from './backupformats.js';
+import backupSites from './backupsites.js';
 import BoxError from './boxerror.js';
 import consumers from 'node:stream/consumers';
 import crypto from 'node:crypto';
@@ -10,9 +10,6 @@ import safe from 'safetydance';
 
 const debug = debugModule('box:backupintegrity');
 
-export {
-    check
-};
 
 async function downloadBackupInfo(backupSite, backup) {
     const stream = await backupSites.storageApi(backupSite).download(backupSite.config, `${backup.remotePath}.backupinfo`);
@@ -73,3 +70,7 @@ async function check(backupId, progressCallback) {
     aggregatedMessages.push(...messages);
     await backups.setIntegrityResult(backup, aggregatedMessages.length === 0 ? 'passed' : 'failed', { messages: aggregatedMessages });
 }
+
+export default {
+    check
+};