feat: Convert all app files to JS

packages/backend/src/apps/xero/index.js

@@ -0,0 +1,20 @@
+import defineApp from '../../helpers/define-app.js';
+import addAuthHeader from './common/add-auth-header.js';
+import auth from './auth/index.js';
+import triggers from './triggers/index.js';
+import dynamicData from './dynamic-data/index.js';
+
+export default defineApp({
+  name: 'Xero',
+  key: 'xero',
+  baseUrl: 'https://go.xero.com',
+  apiBaseUrl: 'https://api.xero.com',
+  iconUrl: '{BASE_URL}/apps/xero/assets/favicon.svg',
+  authDocUrl: 'https://automatisch.io/docs/apps/xero/connection',
+  primaryColor: '13B5EA',
+  supportsConnections: true,
+  beforeRequest: [addAuthHeader],
+  auth,
+  triggers,
+  dynamicData,
+});