/**
 * Calculates a MD5 checksum for passed buffer
 * @private
 * @param data  Data to be hashed
 * @returns     base64 encoded MD5 hash
 */
export declare const md5: (data: any) => string;
/**
 * return based string
 * @param data
 */
export declare const b64: (data: string, safeUrl?: boolean) => string;
/**
 * Return currently used filestack-js sdk version
 */
export declare const getVersion: () => string;
/**
 * Returns if browser is a mobile device (if node env always return false)
 */
export declare const isMobile: () => boolean;
/**
 * Check if application is runned in facebook browser
 */
export declare const isFacebook: () => boolean;