/**
 * Checks whether a URL string is absolute (starts with http:// or https://).
 *
 * @param url - The URL string to check.
 * @returns True if the URL is absolute; otherwise, false.
 *
 * @example
 * ```ts
 * isAbsoluteUrl('https://example.com');
 * // true
 *
 * isAbsoluteUrl('/relative/path');
 * // false
 * ```
 */
export declare function isAbsoluteUrl(url: string): boolean;
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