Debounce.js

const debounce = (func, waitTime) => {
  let startTime;
  let timeoutId;

  let isWorking = () => {
    return timeoutId && startTime + waitTime > Date.now();
  }

  return () => {
    if (isWorking()) {
      clearInterval(timeoutId);
    }

    startTime = Date.now();

    timeoutId = setTimeout(() => {
      func.apply(this, arguments);
    }, waitTime);
  }
}

export {
  Debounce
};

The arguments you are sending the callback are not available in setTimeout(). This should solve this:

return (...args) => {
        if (isWorking()) {
            clearInterval(timeoutId);
        }

        startTime = Date.now();

        timeoutId = setTimeout(() => {
                func(...args);
        }, waitTime);
    }

😸