/**
 * Check freshness of the response using request and response headers.
 *
 * @param {Object} reqHeaders
 * @param {Object} resHeaders
 * @return {Boolean}
 * @public
 */
export declare function fresh(reqHeaders: any, resHeaders: any): boolean;
/**
 * Parse an HTTP Date into a number.
 *
 * @param {string} date
 * @private
 */
export declare function parseHttpDate(date: any): number;
/**
 * Parse a HTTP token list.
 *
 * @param {string} str
 * @private
 */
export declare function parseTokenList(str: any): any[];