declare function isValidProxyUrl(key: string | undefined): boolean;
declare function isHttpOrHttps(key: string | undefined): boolean;
declare function isProxyUrlRelative(key: string): boolean;
declare function proxyUrlToAbsoluteURL(url: string | undefined): string;
/**
 * @deprecated Use `buildRequestUrl` from @clerk/backend
 */
declare function getRequestUrl({ request, relativePath }: {
    request: Request;
    relativePath?: string;
}): URL;

export { getRequestUrl, isHttpOrHttps, isProxyUrlRelative, isValidProxyUrl, proxyUrlToAbsoluteURL };