import { Response, NextFunction } from 'express';
import { AuthenticatedRequest } from '../types';
/**
 * Express middleware to authenticate requests using JWT
 *
 * Usage:
 * ```typescript
 * import { authenticate } from './middleware/authenticate';
 *
 * // Protect a route
 * app.get('/protected', authenticate(jwtSecret, jwtIssuer), (req, res) => {
 *   const { did } = req.auth!;
 *   res.json({ message: `Hello, ${did}` });
 * });
 * ```
 *
 * @param secret - JWT signing secret
 * @param issuer - Expected JWT issuer
 * @returns Express middleware function
 */
export declare function authenticate(secret: string, issuer: string): (req: AuthenticatedRequest, res: Response, next: NextFunction) => Promise<void>;
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