/**
 * Checks if a given string is a valid URL.
 *
 * @param {string} url - The string to be validated as a URL.
 * @returns {boolean} Returns true if the string is a valid URL, false otherwise.
 *
 * @example
 * isValidUrl('https://www.example.com'); // returns true
 * isValidUrl('not a url'); // returns false
 */
export declare function isValidUrl(url: string): boolean;
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