lbry-desktop/ui/util/debounce.js

// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
export default function debouce(func, waitInMs, immediate) {
  let timeout;

  return function () {
    const context = this;
    const args = arguments;
    const later = () => {
      timeout = null;
      if (!immediate) func.apply(context, args);
    };

    const callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, waitInMs);
    if (callNow) func.apply(context, args);
  };
}