migrate to "export default"

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

src/mailer.js

@@ -1,15 +1,15 @@
 import assert from 'node:assert';
 import BoxError from './boxerror.js';
-import * as branding from './branding.js';
+import branding from './branding.js';
 import constants from './constants.js';
-import * as dashboard from './dashboard.js';
+import dashboard from './dashboard.js';
 import debugModule from 'debug';
 import ejs from 'ejs';
-import * as mailServer from './mailserver.js';
+import mailServer from './mailserver.js';
 import nodemailer from 'nodemailer';
 import path from 'node:path';
 import safe from 'safetydance';
-import * as translations from './translations.js';
+import translations from './translations.js';
 
 const debug = debugModule('box:mailer');
 
@@ -19,22 +19,6 @@ function clearMailQueue() {
     _mailQueue.length = 0;
 }
 
-export {
-    passwordReset,
-    sendInvite,
-    sendNewLoginLocation,
-    backupFailed,
-    certificateRenewalError,
-    appDown,
-    appUp,
-    oomEvent,
-    rebootRequired,
-    boxUpdateError,
-    lowDiskSpace,
-    sendTestMail,
-    _mailQueue,
-    clearMailQueue,
-};
 
 const MAIL_TEMPLATES_DIR = path.join(import.meta.dirname, 'mail_templates');
 
@@ -352,3 +336,20 @@ async function sendTestMail(domain, email) {
 
     await sendMail(mailOptions);
 }
+
+export default {
+    passwordReset,
+    sendInvite,
+    sendNewLoginLocation,
+    backupFailed,
+    certificateRenewalError,
+    appDown,
+    appUp,
+    oomEvent,
+    rebootRequired,
+    boxUpdateError,
+    lowDiskSpace,
+    sendTestMail,
+    _mailQueue,
+    clearMailQueue,
+};