import { RequestHandler } from 'express';
import express from 'express';
import { Options as RateLimitOptions } from 'express-rate-limit';
import { OAuthServer } from '../OAuthServer.js';
export type AuthenticationHandlerOptions = {
    provider: OAuthServer;
    /**
     * Rate limiting configuration for the authorization endpoint.
     * Set to false to disable rate limiting for this endpoint.
     */
    rateLimit?: Partial<RateLimitOptions> | false;
    /**
     * Extract the authenticated user ID from the request.
     */
    getUser: (req: express.Request) => Promise<string> | string;
};
export declare function authenticateHandler({ provider, rateLimit: rateLimitConfig, getUser }: AuthenticationHandlerOptions): RequestHandler;