declare const protocols: readonly ["http", "https", "ftp", "ftps", "file", "data", "mailto", "tel", "sms", "ws", "wss"];
type Protocol = (typeof protocols)[number];
export type AbsoluteUrl = `${Protocol}://${string}` | `${Protocol}:${string}`;
/**
 * Check if a URL is absolute
 * @param url - The URL to check
 * @returns True if the URL is absolute, false otherwise
 */
export declare const isAbsoluteUrl: (url: unknown) => url is AbsoluteUrl;
export {};