/**
 * Determines whether the given string looks like a URL.
 *
 * @param url The string to scrutinise.
 *
 * @example
 * ```js
 * const isURL = isURL( 'https://wordpress.org' ); // true
 * ```
 *
 * @see https://url.spec.whatwg.org/
 * @see https://url.spec.whatwg.org/#valid-url-string
 *
 * @return Whether or not it looks like a URL.
 */
export declare function isURL(url: string): boolean;
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