cat-detector.vars.js

const variableNames = new Proxy({}, {
  has() { return true; },
  get(_, key) {
    if (key in globalThis) {
      const globalValue = globalThis[key];
      return typeof globalValue === 'function'
        ? globalValue.bind(globalThis)
        : globalValue;
    } else {
      return key;
    }
  },
});

with (variableNames) {
  while (true) {
    const maybeCat = prompt(Cat_please + ', ' + upper_or_lower_case + '.');

    if (maybeCat === null) {
      alert(There_is_no_escape + '.');
    } else if (maybeCat.toLowerCase() === cat.toLowerCase()) {
      alert(Thank_you_for_the_ + maybeCat + '.');
      break;
    } else {
      alert(maybeCat + _is_not_a_cat + ', ' + try_again + '.');
    }
  }
}

// tags: the fun parts