import { NextFunction, Request, Response } from 'express';
/**
 * Authentication middleware checks each request for a valid AuthToken
 * If no valid AuthToken is found send a 401 to indicate the request was denied due to authentication
 * @param req The request to be checked
 * @param res The response
 * @param next The next function to invoke the next middleware
 */
export declare const authHandler: (req: Request, res: Response, next: NextFunction) => Promise<void>;