// gandalf-gate — a tiny guard utility. "You shall not pass" invalid input.
function youShallNotPass(condition, message = 'You shall not pass!') {
  if (!condition) throw new Error(message);
}
// A simple gatekeeper: allow at most `max` calls, then refuse.
function gatekeeper(max) {
  let count = 0;
  return () => { if (count++ >= max) throw new Error('You shall not pass! (limit reached)'); };
}
module.exports = { youShallNotPass, gatekeeper };