/**
 * @external URL
 * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/URL|URL}
 */
/**
 * @module utils/referrer
 * @private
 */
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#strip-url|Referrer Policy §8.4. Strip url for use as a referrer}
 * @param {string} URL
 * @param {boolean} [originOnly=false]
 */
export function stripURLForUseAsAReferrer(url: any, originOnly?: boolean): any;
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#referrer-policies|Referrer Policy §3. Referrer Policies}
 * @param {string} referrerPolicy
 * @returns {string} referrerPolicy
 */
export function validateReferrerPolicy(referrerPolicy: string): string;
/**
 * @see {@link https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy|Referrer Policy §3.2. Is origin potentially trustworthy?}
 * @param {external:URL} url
 * @returns `true`: "Potentially Trustworthy", `false`: "Not Trustworthy"
 */
export function isOriginPotentiallyTrustworthy(url: any): boolean;
/**
 * @see {@link https://w3c.github.io/webappsec-secure-contexts/#is-url-trustworthy|Referrer Policy §3.3. Is url potentially trustworthy?}
 * @param {external:URL} url
 * @returns `true`: "Potentially Trustworthy", `false`: "Not Trustworthy"
 */
export function isUrlPotentiallyTrustworthy(url: any): boolean;
/**
 * Modifies the referrerURL to enforce any extra security policy considerations.
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}, step 7
 * @callback module:utils/referrer~referrerURLCallback
 * @param {external:URL} referrerURL
 * @returns {external:URL} modified referrerURL
 */
/**
 * Modifies the referrerOrigin to enforce any extra security policy considerations.
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}, step 7
 * @callback module:utils/referrer~referrerOriginCallback
 * @param {external:URL} referrerOrigin
 * @returns {external:URL} modified referrerOrigin
 */
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}
 * @param {Request} request
 * @param {object} o
 * @param {module:utils/referrer~referrerURLCallback} o.referrerURLCallback
 * @param {module:utils/referrer~referrerOriginCallback} o.referrerOriginCallback
 * @returns {external:URL} Request's referrer
 */
export function determineRequestsReferrer(request: Request, { referrerURLCallback, referrerOriginCallback }?: {
    referrerURLCallback: any;
    referrerOriginCallback: any;
}): External;
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#parse-referrer-policy-from-header|Referrer Policy §8.1. Parse a referrer policy from a Referrer-Policy header}
 * @param {Headers} headers Response headers
 * @returns {string} policy
 */
export function parseReferrerPolicyFromHeader(headers: Headers): string;
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#enumdef-referrerpolicy|enum ReferrerPolicy}
 */
export const ReferrerPolicy: Set<string>;
/**
 * @see {@link https://w3c.github.io/webappsec-referrer-policy/#default-referrer-policy|default referrer policy}
 */
export const DEFAULT_REFERRER_POLICY: "strict-origin-when-cross-origin";
/**
 * :utils/referrer~referrerURLCallback
 */
export type module = (: External) => External;