/// <reference path="../adonis-typings/index.d.ts" />
import { HstsOptions } from '@ioc:Adonis/Addons/Shield';
import { noop } from './noop';
/**
 * Factory function that returns a new function to Add `Strict-Transport-Security`
 * header based upon given user options.
 */
export declare function hstsFactory(options: HstsOptions): typeof noop;