fix migrations

Fix #8363

packages/backend/migration/1579267006611-v12.js

@@ -1,6 +1,6 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-class v121579267006611 {
+
+
+export class v121579267006611 {
     constructor() {
         this.name = 'v121579267006611';
     }
@@ -31,4 +31,3 @@ class v121579267006611 {
         await queryRunner.query(`DROP TABLE "announcement"`, undefined);
     }
 }
-exports.v121579267006611 = v121579267006611;