/**
 * LocalSecret Storage
 *
 * IndexedDB-based storage for LocalSecrets.
 * The LocalSecret is stored locally on the device and never sent to servers.
 *
 * Issue #1649
 */
import type { LocalSecretStorage, StoredLocalSecret } from "./types";
/**
 * Get or create a unique device ID
 *
 * The device ID is stored in localStorage for persistence.
 */
export declare function getOrCreateDeviceId(): Promise<string>;
/**
 * Store a LocalSecret in IndexedDB
 *
 * @param userId - User's Cognito sub
 * @param secret - The 32-byte LocalSecret
 */
export declare function storeLocalSecret(userId: string, secret: Uint8Array): Promise<void>;
/**
 * Retrieve a LocalSecret from IndexedDB
 *
 * @param userId - User's Cognito sub
 * @returns The LocalSecret or null if not found
 */
export declare function getLocalSecret(userId: string): Promise<Uint8Array | null>;
/**
 * Delete a LocalSecret from IndexedDB
 *
 * @param userId - User's Cognito sub
 */
export declare function deleteLocalSecret(userId: string): Promise<void>;
/**
 * Check if a LocalSecret exists for a user
 *
 * @param userId - User's Cognito sub
 * @returns true if a LocalSecret exists
 */
export declare function hasLocalSecret(userId: string): Promise<boolean>;
/**
 * Get the stored LocalSecret record (including metadata)
 *
 * @param userId - User's Cognito sub
 * @returns The full storage record or null
 */
export declare function getLocalSecretRecord(userId: string): Promise<StoredLocalSecret | null>;
/**
 * Create a LocalSecretStorage implementation using IndexedDB
 */
export declare function createIndexedDBStorage(): LocalSecretStorage;