@axe/lazy-load-img/lib/utils.js

A library of lazy load image when it is necessary.

import "core-js/modules/es6.date.now";
export function throttle(fn, wait, trailing) {
  if (wait === void 0) {
    wait = 100;
  }

  var timer = null;
  var startTime = 0;
  var currTime, remainTime;
  return function () {
    var _this = this,
        _arguments = arguments;

    currTime = Date.now();
    remainTime = wait - (currTime - startTime);

    if (remainTime <= 0) {
      if (timer) {
        clearTimeout(timer);
        timer = null;
      }

      startTime = currTime;
      fn.apply(this, arguments);
    } else if (!timer && trailing !== false) {
      timer = setTimeout(function () {
        timer = null;
        startTime = Date.now();
        fn.apply(_this, _arguments);
      }, remainTime);
    }
  };
}