/// <reference path="../adonis-typings/index.d.ts" />
import { DnsPrefetchOptions } from '@ioc:Adonis/Addons/Shield';
import { noop } from './noop';
/**
 * Factory that returns a function to set `X-DNS-Prefetch-Control` header.
 */
export declare function dnsPrefetchFactory(options: DnsPrefetchOptions): typeof noop;