migrate to "export default"

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

src/locks.js

@@ -1,6 +1,6 @@
 import assert from 'node:assert';
 import BoxError from './boxerror.js';
-import * as database from './database.js';
+import database from './database.js';
 import debugModule from 'debug';
 import promiseRetry from './promise-retry.js';
 
@@ -12,24 +12,6 @@ const TYPE_BOX_UPDATE = 'box_update';
 const TYPE_BOX_UPDATE_TASK = 'box_update_task';
 const TYPE_FULL_BACKUP_TASK_PREFIX = 'full_backup_task_';
 
-export default {
-    setTaskId,
-
-    acquire,
-    wait,
-
-    release,
-    releaseAll,
-    releaseByTaskId,
-
-    TYPE_APP_TASK_PREFIX,
-    TYPE_APP_BACKUP_PREFIX,
-    TYPE_BOX_UPDATE,
-    TYPE_BOX_UPDATE_TASK,
-    TYPE_FULL_BACKUP_TASK_PREFIX,
-
-    TYPE_MAIL_SERVER_RESTART: 'mail_restart',
-};
 
 let gTaskId = null;
 
@@ -131,3 +113,22 @@ async function releaseByTaskId(taskId) {
         debug(`releaseByTaskId: ${taskId}`);
     });
 }
+
+export default {
+    setTaskId,
+
+    acquire,
+    wait,
+
+    release,
+    releaseAll,
+    releaseByTaskId,
+
+    TYPE_APP_TASK_PREFIX,
+    TYPE_APP_BACKUP_PREFIX,
+    TYPE_BOX_UPDATE,
+    TYPE_BOX_UPDATE_TASK,
+    TYPE_FULL_BACKUP_TASK_PREFIX,
+
+    TYPE_MAIL_SERVER_RESTART: 'mail_restart',
+};