dbHelper.js

// indexedDBHelper.js
export function openDatabase(dbName, storeName) {
  return new Promise((resolve, reject) => {
    const request = indexedDB.open(dbName, 1);

    request.onupgradeneeded = function (event) {
      const db = event.target.result;
      if (!db.objectStoreNames.contains(storeName)) {
        db.createObjectStore(storeName, { keyPath: 'id' });
      }
    };

    request.onsuccess = function (event) {
      resolve(event.target.result);
    };

    request.onerror = function (event) {
      reject(event.target.error);
    };
  });
}

export function saveContent(db, storeName, content, key) {
  return new Promise((resolve, reject) => {
    const transaction = db.transaction([storeName], 'readwrite');
    const store = transaction.objectStore(storeName);
    const request = store.put({ id: key, content });

    request.onsuccess = function () {
      resolve();
    };

    request.onerror = function (event) {
      reject(event.target.error);
    };
  });
}

export function getContent(db, storeName, key) {
  return new Promise((resolve, reject) => {
    const transaction = db.transaction([storeName], 'readonly');
    const store = transaction.objectStore(storeName);
    const request = store.get(key);

    request.onsuccess = function (event) {
      resolve(event.target.result ? event.target.result.content : null);
    };

    request.onerror = function (event) {
      reject(event.target.error);
    };
  });
}