/**
 * Check if the current device is mobile
 */
export declare function isMobile(): boolean;
/**
 * Check if the screen is small (mobile-sized)
 */
export declare function isSmallScreen(): boolean;
/**
 * Check if the browser supports required features
 */
export declare function isSupported(): boolean;
/**
 * Get the appropriate verification mode based on device
 */
export declare function getDefaultMode(): 'modal';
/**
 * Get the browser's language
 */
export declare function getBrowserLanguage(): string;
/**
 * Check if browser supports cookies
 */
export declare function supportsCookies(): boolean;
/**
 * Check if the current user agent is a search engine bot/crawler
 * Used to allow search engines to bypass age verification for SEO purposes
 *
 * @param mode - Detection mode: 'ua' | 'headless' | 'cookies' | 'combined' | 'strict'
 */
export declare function isSearchEngineBot(mode?: string): boolean;