react-table-filter-2/src/lib/debounce.js

module.exports = (func, wait, immediate) => {
  let timeout; let args; let context; let timestamp; let result;
  if (null == wait) wait = 100;

  function later() {
    const last = Date.now() - timestamp;

    if (last < wait && last >= 0) {
      timeout = setTimeout(later, wait - last);
    } else {
      timeout = null;
      if (!immediate) {
        result = func.apply(context, args);
        context = args = null;
      }
    }
  }

  const debounced = function() {
    context = this;
    args = arguments;
    timestamp = Date.now();
    const callNow = immediate && !timeout;
    if (!timeout) timeout = setTimeout(later, wait);
    if (callNow) {
      result = func.apply(context, args);
      context = args = null;
    }

    return result;
  };

  debounced.clear = function() {
    if (timeout) {
      clearTimeout(timeout);
      timeout = null;
    }
  };

  debounced.flush = function() {
    if (timeout) {
      result = func.apply(context, args);
      context = args = null;

      clearTimeout(timeout);
      timeout = null;
    }
  };

  return debounced;
};