/**
 * Validates that all URLs share the same hostname
 * @param urls - Array of URLs to validate
 * @returns The common hostname if all URLs share the same host
 * @throws {Error} if URLs have different hostnames
 * @example
 * ```ts
 * validateSameHost(['https://example.com/', 'https://example.com/page']) // 'example.com'
 * validateSameHost(['https://a.com/', 'https://b.com/']) // throws Error
 * ```
 */
export declare function validateSameHost(urls: string[]): string;