export declare const FetchDestValues: ("object" | "image" | "style" | "document" | "script" | "audio" | "embed" | "iframe" | "track" | "video" | "audioworklet" | "font" | "frame" | "manifest" | "paintworklet" | "report" | "serviceworker" | "sharedworker" | "worker" | "xslt" | "empty")[];
export type FetchDest = (typeof FetchDestValues)[number];
/**
 * Returns the value of the `Sec-Fetch-Dest` header.
 *
 * The `Sec-Fetch-Dest` header indicates the destination of the request and
 * can be used to know if the request came from a `fetch` call or not, among
 * other things.
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Dest
 * @example
 * // Detect if the request came from a fetch call and return
 * // json, otherwise return a redirect
 * export async function action({ request }: Route.ActionArgs) {
 *   let dest = fetchDest(request);
 *   if (dest === "empty") return json(data)
 *   return redirect(destination)
 * }
 */
export declare function fetchDest(request: Request): FetchDest | null;
export declare function fetchDest(headers: Headers): FetchDest | null;
export declare const FetchModeValues: ("same-origin" | "navigate" | "cors" | "no-cors" | "websocket")[];
export type FetchMode = (typeof FetchModeValues)[number];
/**
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode
 */
export declare function fetchMode(request: Request): FetchMode | null;
export declare function fetchMode(headers: Headers): FetchMode | null;
export declare const FetchSiteValues: ("none" | "same-origin" | "cross-site" | "same-site")[];
export type FetchSite = (typeof FetchSiteValues)[number];
/**
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Site
 */
export declare function fetchSite(request: Request): FetchSite | null;
export declare function fetchSite(headers: Headers): FetchSite | null;
export declare const FetchUserValues: "?1"[];
export type FetchUser = (typeof FetchUserValues)[number];
/**
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Sec-Fetch-User
 */
export declare function isUserInitiated(request: Request): boolean;
export declare function isUserInitiated(headers: Headers): boolean;