function debounce(func, wait, context, setTimeoutFunc, clearTimeoutFunc) {
  setTimeoutFunc = setTimeoutFunc || setTimeout;
  clearTimeoutFunc = clearTimeoutFunc || clearTimeout;
  let timeout;

  function debouncer(...args) {
    debouncer.reset();

    const callback = function() {
      func.apply(context, args);
    };
    callback.__SMmeta = func.__SMmeta;
    timeout = setTimeoutFunc(callback, wait);
  }

  debouncer.reset = function() {
    clearTimeoutFunc(timeout);
  };

  return debouncer;
}
Invokes the given callback after a specified number of milliseconds have
elapsed, ignoring subsequent calls.

For example, if you wanted to update a preview after the user stops typing
you could do the following:

  elem.addEventListener('keyup', debounce(this.updatePreview, 250), false);

The returned function has a reset method which can be called to cancel a
pending invocation.

  var debouncedUpdatePreview = debounce(this.updatePreview, 250);
  elem.addEventListener('keyup', debouncedUpdatePreview, false);

  // later, to cancel pending calls
  debouncedUpdatePreview.reset();

@param {function} func - the function to debounce
@param {number} wait - how long to wait in milliseconds
@param {*} context - optional context to invoke the function in
@param {?function} setTimeoutFunc - an implementation of setTimeout
 if nothing is passed in the default setTimeout function is used
@param {?function} clearTimeoutFunc - an implementation of clearTimeout
 if nothing is passed in the default clearTimeout function is used