getAllDexieDatabaseNames.js

async function getAllDexieDatabaseNames(dexieRootName = '__dbnames') {
  return new Promise((resolve, reject) => {
    const DBOpenRequest = window.indexedDB.open(dexieRootName);
    DBOpenRequest.onerror = () => reject(DBOpenRequest.error);
    DBOpenRequest.onsuccess = () => {
      const db = DBOpenRequest.result;
      const dbNameStore = Array.from(event.target.result.objectStoreNames);
      if (dbNameStore.length > 0) {
        const transaction = db.transaction('dbnames', 'readonly');
        transaction.onerror = () => reject(transaction.error);

        const objectStore = transaction.objectStore('dbnames');
        const request = objectStore.getAll();
        request.onerror = () => reject(request.error);
        request.onsuccess = (event) => {
          const databaseNames = event.target.result.map(item => item.name);
          resolve(databaseNames);
        };
      } else {
        resolve([]);
      }
    };
  });
}