/**
 * Persistent shield cache for Node.js SDK.
 *
 * Shields from UserOp TXs are indexed by the bundler address on the backend,
 * not the user's EOA. This cache persists shield data (position, treeNumber,
 * commitment hash, encrypted bundle) extracted from the TX receipt so UTXOs
 * can be discovered without querying the bundler address.
 *
 * Cache file: ~/.b402/shield-cache.json
 */
export interface CachedShield {
    txHash: string;
    tokenAddress: string;
    amount: string;
    indexed: boolean;
    timestamp: number;
    commitmentHash?: string;
    treeNumber?: any;
    position?: any;
    npk?: string;
    encryptedBundle0?: string;
    encryptedBundle1?: string;
    encryptedBundle2?: string;
    shieldKey?: string;
    [key: string]: any;
}
/** Disable disk persistence (for tests). */
export declare function setTestMode(enabled: boolean): void;
export declare function getCachedShield(key: string): CachedShield | null;
export declare function getCachedShields(walletKey: string): CachedShield[];
export declare function setCachedShield(key: string, entry: CachedShield): void;
export declare function clearShieldCache(): void;