migrate to "export default"

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

src/system.js

@@ -1,41 +1,26 @@
 import apps from './apps.js';
 import assert from 'node:assert';
-import { AsyncTask } from './asynctask.js';
-import * as backupSites from './backupsites.js';
+import asynctask from './asynctask.js';
+const { AsyncTask } = asynctask;
+import backupSites from './backupsites.js';
 import BoxError from './boxerror.js';
 import debugModule from 'debug';
-import * as df from './df.js';
-import * as docker from './docker.js';
+import df from './df.js';
+import docker from './docker.js';
 import eventlog from './eventlog.js';
 import fs from 'node:fs';
-import * as logs from './logs.js';
-import * as notifications from './notifications.js';
+import logs from './logs.js';
+import notifications from './notifications.js';
 import os from 'node:os';
 import path from 'node:path';
 import paths from './paths.js';
 import safe from 'safetydance';
 import shellModule from './shell.js';
-import * as volumes from './volumes.js';
+import volumes from './volumes.js';
 
 const debug = debugModule('box:system');
 const shell = shellModule('system');
 
-export {
-    reboot,
-    getInfo,
-    getUbuntuVersion,
-    getKernelVersion,
-    getSwaps,
-    checkDiskSpace,
-    getMemory,
-    getLogs,
-    getBlockDevices,
-    runSystemChecks,
-    getProvider,
-    getCpus,
-    getFilesystems,
-    getFilesystemUsage
-};
 
 const DU_CMD = path.join(import.meta.dirname, 'scripts/du.sh');
 const HDPARM_CMD = path.join(import.meta.dirname, 'scripts/hdparm.sh');
@@ -402,3 +387,20 @@ function getProvider() {
 async function getCpus() {
     return os.cpus();
 }
+
+export default {
+    reboot,
+    getInfo,
+    getUbuntuVersion,
+    getKernelVersion,
+    getSwaps,
+    checkDiskSpace,
+    getMemory,
+    getLogs,
+    getBlockDevices,
+    runSystemChecks,
+    getProvider,
+    getCpus,
+    getFilesystems,
+    getFilesystemUsage
+};