/**
 * Express/Connect middleware for x402-cfo.
 *
 * Wraps any Express app so every outbound x402 payment goes through
 * the CFO's budget enforcement, cost policies, and audit trail.
 * Also exposes a GET /_cfo endpoint for live spend monitoring.
 *
 * Usage:
 *   import express from 'express';
 *   import { AgentCFO } from 'x402-cfo';
 *   import { createExpressMiddleware } from 'x402-cfo';
 *
 *   const app = express();
 *   const cfo = new AgentCFO({ wallet, budget: { daily: 50 } });
 *   app.use(createExpressMiddleware(cfo));
 */
import type { AgentCFO } from './controller.js';
export interface ExpressMiddlewareOptions {
    /** Mount path for the dashboard endpoint. Default: '/_cfo' */
    dashboardPath?: string;
    /** Enable the /_cfo dashboard endpoint. Default: true */
    enableDashboard?: boolean;
}
/**
 * Create Express middleware that:
 * 1. Attaches the AgentCFO instance to req.cfo for route handlers
 * 2. Exposes a GET /_cfo endpoint returning live spend data as JSON
 * 3. Exposes a GET /_cfo/html endpoint returning a styled dashboard page
 */
export declare function createExpressMiddleware(cfo: AgentCFO, options?: ExpressMiddlewareOptions): (req: any, res: any, next: any) => any;
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