import { ErrorRequestHandler, RequestHandler } from 'express';
import { EnvoySignatureVerifierOptions } from '../util/EnvoySignatureVerifier';
/**
 * Sets up an {@link EnvoyPluginSDK} object in the path `req.envoy`.
 * Modifies the `res` object to include Envoy's helpers, per {@link EnvoyResponse}.
 *
 * Also verifies that the request is coming from Envoy,
 * as well as managing the plugin access token lifecycle.
 *
 * @category Middleware
 */
export declare function envoyMiddleware(options?: EnvoySignatureVerifierOptions): RequestHandler;
/**
 * Catches errors and sets the proper status code.
 *
 * @category Middleware
 */
export declare function errorMiddleware(onError?: (err: Error) => void): ErrorRequestHandler;
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