import { RequestHandler } from 'express';
export interface ICspMiddlewareOptions {
    baseUri?: string[];
    childSrc?: string[];
    connectSrc?: string[];
    defaultSrc?: string[];
    fontSrc?: string[];
    formAction?: string[];
    frameAncestors?: string[];
    imgSrc?: string[];
    reportUri?: string;
    scriptSrc?: string[];
    styleSrc?: string[];
    upgradeInsecureRequests?: boolean;
}
/**
 * Returns an Express compatible middleware
 */
export declare const cspMiddleware: ({ baseUri, childSrc, connectSrc, defaultSrc, fontSrc, formAction, frameAncestors, imgSrc, reportUri, scriptSrc, styleSrc, upgradeInsecureRequests, }?: ICspMiddlewareOptions) => RequestHandler;