import type { FormattedPrimitiveTypeCreator } from '../types.js';
/**
 * Checks whether a string is a valid absolute URL.
 *
 * @see https://url.spec.whatwg.org/#syntax-url-absolute
 *
 * > An absolute-URL string must be one of the following:
 * > - a URL-scheme string that is an ASCII case-insensitive match
 * >   for a special scheme and not an ASCII case-insensitive match for "file",
 * >   followed by U+003A (:) and a scheme-relative-special-URL string
 * > - a URL-scheme string that is not an ASCII case-insensitive match
 * >   for a special scheme, followed by U+003A (:) and a relative-URL string
 * > - a URL-scheme string that is an ASCII case-insensitive match for "file",
 * >   followed by U+003A (:) and a scheme-relative-file-URL string
 *
 */
export declare const isAbsURL: FormattedPrimitiveTypeCreator;