/**
 * Persistent storage adapter for x402-cfo.
 *
 * By default everything is in-memory. This interface lets users
 * plug in file-based, SQLite, or any other storage so ledger
 * history survives agent restarts.
 *
 * Ships with a built-in JSON file adapter.
 */
import type { LedgerEntry } from './ledger.js';
/** Storage adapter interface — implement this for custom backends. */
export interface StorageAdapter {
    /** Load all ledger entries. */
    load(): LedgerEntry[] | Promise<LedgerEntry[]>;
    /** Append a single entry. */
    append(entry: LedgerEntry): void | Promise<void>;
    /** Save all entries (full sync). */
    save(entries: LedgerEntry[]): void | Promise<void>;
}
/**
 * JSON file storage adapter.
 *
 * Simple, zero-dependency persistence. Writes a JSON file on every
 * append so no data is lost. Good enough for single-agent setups.
 *
 * Usage:
 *   const agent = new AgentCFO({
 *     wallet: myWallet,
 *     storage: new JsonFileStorage('./agent-ledger.json'),
 *   });
 */
export declare class JsonFileStorage implements StorageAdapter {
    private path;
    constructor(filePath: string);
    load(): LedgerEntry[];
    append(entry: LedgerEntry): void;
    save(entries: LedgerEntry[]): void;
}
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