import type { WebSecureStorageBackend } from "./web-storage-backend";
export type IndexedDBBackendOptions = {
    channelName?: string;
    onError?: (error: Error) => void;
};
/**
 * Creates a `WebSecureStorageBackend` backed by IndexedDB.
 *
 * IndexedDB is async, but `WebSecureStorageBackend` requires a synchronous
 * interface. This implementation bridges the gap with a write-through in-memory
 * cache:
 *
 * - **Reads** are always served from the in-memory cache (synchronous, O(1)).
 * - **Writes** update the cache synchronously, then persist to IndexedDB
 *   asynchronously in the background.
 * - **Initialisation**: the returned backend pre-loads all persisted entries
 *   from IndexedDB into memory before resolving, so the first synchronous read
 *   after `await createIndexedDBBackend()` already returns the correct value.
 *
 * @param dbName    Name of the IndexedDB database. Defaults to `"nitro-storage-secure"`.
 * @param storeName Name of the object store inside the database. Defaults to `"keyvalue"`.
 *
 * @example
 * ```ts
 * import { setWebSecureStorageBackend } from "react-native-nitro-storage";
 * import { createIndexedDBBackend } from "react-native-nitro-storage/indexeddb-backend";
 *
 * const backend = await createIndexedDBBackend();
 * setWebSecureStorageBackend(backend);
 * ```
 */
export declare function createIndexedDBBackend(dbName?: string, storeName?: string, options?: IndexedDBBackendOptions): Promise<WebSecureStorageBackend>;
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