/**
 * Constant used to specify that key will never expire.
 */
declare const INFINITE_EXPIRATION = 0;
/**
 * @private
 */
declare const NOT_FOUND_VALUE: undefined;
/**
 * @private
 */
declare const EXPIRES_AT_SYM: unique symbol;
export { INFINITE_EXPIRATION, NOT_FOUND_VALUE, EXPIRES_AT_SYM };