import { Storage as Storage_2 } from 'expo-storage-universal';

/**
 * NativeRegularStorage class implementing the Storage interface for native platforms.
 * Utilizes AsyncStorage for non-secure data storage on iOS and Android.
 */
export declare class NativeRegularStorage implements Storage_2 {
    /**
     * Creates a new instance of NativeRegularStorage.
     */
    constructor();
    /**
     * Retrieves a value from AsyncStorage.
     * @param {string} key - The key of the item to retrieve.
     * @returns {Promise<string | undefined>} - A promise that resolves to the retrieved value or undefined if not found.
     * @example
     * const value = await storage.find('userId');
     */
    find(key: string): Promise<string | undefined>;
    /**
     * Saves a value to AsyncStorage.
     * @param {string} key - The key under which the value should be stored.
     * @param {string} value - The value to store.
     * @returns {Promise<void>} - A promise that resolves when the value has been saved.
     * @example
     * await storage.save('userId', '12345');
     */
    save(key: string, value: string): Promise<void>;
    /**
     * Removes a value from AsyncStorage.
     * @param {string} key - The key of the item to remove.
     * @returns {Promise<void>} - A promise that resolves when the value has been removed.
     * @example
     * await storage.remove('userId');
     */
    remove(key: string): Promise<void>;
}

/**
 * NativeSecureStorage implements the Storage interface using Expo's SecureStore.
 * This implementation provides secure storage capabilities for React Native applications,
 * storing data in the device's secure storage system (Keychain on iOS, EncryptedSharedPreferences on Android).
 *
 * @remarks
 * - Uses expo-secure-store for platform-specific secure storage implementation
 * - Provides encryption at rest for stored data
 * - Suitable for storing sensitive information like authentication tokens, API keys, and user credentials
 * - Data persists across app restarts
 */
export declare class NativeSecureStorage implements Storage_2 {
    /**
     * Creates a new instance of NativeSecureStorage.
     * No initialization is required as SecureStore is stateless.
     */
    constructor();
    /**
     * Finds a value from secure storage.
     * @param {string} key - The key of the item to retrieve.
     * @returns {Promise<string | undefined>} - A promise that resolves to the retrieved value or undefined if not found.
     * @throws {Error} If there's an error accessing the secure storage.
     *
     * @remarks
     * - Returns undefined if the key doesn't exist
     * - Automatically decrypts the stored value
     */
    find(key: string): Promise<string | undefined>;
    /**
     * Saves a value to secure storage.
     * @param {string} key - The key under which the value should be stored.
     * @param {string} value - The value to store.
     * @returns {Promise<void>} - A promise that resolves when the value has been saved.
     * @throws {Error} If there's an error saving to secure storage.
     *
     * @remarks
     * - Automatically encrypts the value before storage
     * - If the key already exists, the value will be overwritten
     */
    save(key: string, value: string): Promise<void>;
    /**
     * Removes a value from secure storage.
     * @param {string} key - The key of the item to remove.
     * @returns {Promise<void>} - A promise that resolves when the value has been removed.
     * @throws {Error} If there's an error removing from secure storage.
     *
     * @remarks
     * - No-op if the key doesn't exist
     * - Permanently deletes the encrypted data
     */
    remove(key: string): Promise<void>;
}

export { }