/**
 * Web secure storage using encrypted localStorage
 *
 * Uses SubtleCrypto for AES-GCM encryption when Web Crypto API is available
 */
import type { SecureStorageOptions, StorageResult } from "./types";
import { BaseSecureStorageAdapter } from "./adapter";
/**
 * Web storage adapter with encryption
 *
 * Uses localStorage with AES-GCM encryption via Web Crypto API.
 * Falls back to plain localStorage if crypto is unavailable (with warning).
 */
export declare class WebSecureStorage extends BaseSecureStorageAdapter {
    readonly name = "web-crypto";
    readonly available: boolean;
    private cryptoKey;
    private readonly storageKey;
    constructor(options?: SecureStorageOptions);
    /**
     * Initialize with a derived encryption key
     */
    init(password?: string): Promise<StorageResult<void>>;
    private getOrCreateSalt;
    private encrypt;
    private decrypt;
    set(key: string, value: string): Promise<StorageResult<void>>;
    get(key: string): Promise<StorageResult<string | null>>;
    delete(key: string): Promise<StorageResult<void>>;
    has(key: string): Promise<StorageResult<boolean>>;
    keys(): Promise<StorageResult<string[]>>;
    clear(): Promise<StorageResult<void>>;
    private getStorageData;
}
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