api/sample/dev/talk/bundle/popper-2.11.8/esm/utils/debounce.js

export default function debounce(fn) {
  var pending;
  return function () {
    if (!pending) {
      pending = new Promise(function (resolve) {
        Promise.resolve().then(function () {
          pending = undefined;
          resolve(fn());
        });
      });
    }

    return pending;
  };
}