import { StorageAdapter } from './StorageAdapter';
/**
 * Decorator adapter that transparently encrypts/decrypts values using AES-GCM 256-bit.
 * Wraps any StorageAdapter. Falls back to passthrough when Web Crypto API is unavailable (SSR).
 * Migration: if decryption fails on a stored value, returns it as-is (plain text migration path).
 */
export declare class EncryptedStorageAdapter implements StorageAdapter {
    private inner;
    private keyPromise;
    private subtle;
    constructor(inner: StorageAdapter, secret?: string);
    setItem(key: string, value: string): Promise<void>;
    getItem(key: string): Promise<string | null>;
    removeItem(key: string): Promise<void>;
    clear(): Promise<void>;
}
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