migrate to "export default"

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

src/mail.js

@@ -1,25 +1,25 @@
 import assert from 'node:assert';
 import BoxError from './boxerror.js';
 import constants from './constants.js';
-import * as database from './database.js';
+import database from './database.js';
 import debugModule from 'debug';
-import * as dig from './dig.js';
-import * as dns from './dns.js';
+import dig from './dig.js';
+import dns from './dns.js';
 import eventlog from './eventlog.js';
-import * as mailer from './mailer.js';
-import * as mailServer from './mailserver.js';
+import mailer from './mailer.js';
+import mailServer from './mailserver.js';
 import net from 'node:net';
-import * as network from './network.js';
+import network from './network.js';
 import nodemailer from 'nodemailer';
-import * as notifications from './notifications.js';
+import notifications from './notifications.js';
 import path from 'node:path';
-import * as platform from './platform.js';
+import platform from './platform.js';
 import safe from 'safetydance';
 import services from './services.js';
 import shellModule from './shell.js';
 import superagent from '@cloudron/superagent';
-import * as validator from './validator.js';
-import * as _ from './underscore.js';
+import validator from './validator.js';
+import _ from './underscore.js';
 
 const debug = debugModule('box:mail');
 const shell = shellModule('mail');
@@ -33,50 +33,6 @@ const TYPE_ALIAS = 'alias';
 const _delByDomain = delByDomain;
 const _updateDomain = updateDomain;
 
-export {
-    getStatus,
-    checkConfiguration,
-    listDomains,
-    getDomain,
-    clearDomains,
-    removePrivateFields,
-    setDnsRecords,
-    upsertDnsRecords,
-    validateName,
-    validateDisplayName,
-    setMailFromValidation,
-    setCatchAllAddress,
-    setMailRelay,
-    setMailEnabled,
-    setBanner,
-    sendTestMail,
-    listMailboxesByDomain,
-    listMailboxes,
-    getMailbox,
-    addMailbox,
-    updateMailbox,
-    delMailbox,
-    getAlias,
-    getAliases,
-    setAliases,
-    searchAlias,
-    listMailingListsByDomain,
-    getMailingList,
-    addMailingList,
-    updateMailingList,
-    delMailingList,
-    resolveMailingList,
-    getStats,
-    checkStatus,
-    OWNERTYPE_USER,
-    OWNERTYPE_GROUP,
-    OWNERTYPE_APP,
-    TYPE_MAILBOX,
-    TYPE_LIST,
-    TYPE_ALIAS,
-    _delByDomain,
-    _updateDomain,
-};
 
 const DNS_OPTIONS = { timeout: 20000, tries: 4 };
 const REMOVE_MAILBOX_CMD = path.join(import.meta.dirname, 'scripts/rmmailbox.sh');
@@ -1239,3 +1195,47 @@ async function checkStatus() {
     }
 }
 
+export default {
+    getStatus,
+    checkConfiguration,
+    listDomains,
+    getDomain,
+    clearDomains,
+    removePrivateFields,
+    setDnsRecords,
+    upsertDnsRecords,
+    validateName,
+    validateDisplayName,
+    setMailFromValidation,
+    setCatchAllAddress,
+    setMailRelay,
+    setMailEnabled,
+    setBanner,
+    sendTestMail,
+    listMailboxesByDomain,
+    listMailboxes,
+    getMailbox,
+    addMailbox,
+    updateMailbox,
+    delMailbox,
+    getAlias,
+    getAliases,
+    setAliases,
+    searchAlias,
+    listMailingListsByDomain,
+    getMailingList,
+    addMailingList,
+    updateMailingList,
+    delMailingList,
+    resolveMailingList,
+    getStats,
+    checkStatus,
+    OWNERTYPE_USER,
+    OWNERTYPE_GROUP,
+    OWNERTYPE_APP,
+    TYPE_MAILBOX,
+    TYPE_LIST,
+    TYPE_ALIAS,
+    _delByDomain,
+    _updateDomain,
+};