/**
 * check if a user uses IE
 */
export declare function isIE(userAgent?: string): boolean;
export declare function isIpad(userAgent?: string): boolean;
/**
 * return true when UA includes `Line/0.0.0`
 * @param userAgent
 */
export declare function isLINEBrowser(userAgent?: string): boolean;
/**
 * return true when UA includes `Line/0.0.0 LIFF`
 * @param userAgent
 */
export declare function isLIFFBrowser(userAgent?: string): boolean;