Function _interruptionTracker

esm/ScrollTrigger.js:838–854

(getValueFunc, initialValue, onInterrupt)

  }
},
    _interruptionTracker = function _interruptionTracker(getValueFunc, initialValue, onInterrupt) {
  var last1 = initialValue,
      last2 = last1;
  return function (value) {
    var current = Math.round(getValueFunc()); // round because in some [very uncommon] Windows environments, scroll can get reported with decimals even though it was set without.

    if (current !== last1 && current !== last2 && Math.abs(current - last1) > 3 && Math.abs(current - last2) > 3) {
      // if the user scrolls, kill the tween. iOS Safari intermittently misreports the scroll position, it may be the most recently-set one or the one before that! When Safari is zoomed (CMD-+), it often misreports as 1 pixel off too! So if we set the scroll position to 125, for example, it'll actually report it as 124.
      value = current;
      onInterrupt && onInterrupt();
    }

    last2 = last1;
    last1 = Math.round(value);
    return last1;
  };
},
    _shiftMarker = function _shiftMarker(marker, direction, value) {
  var vars = {};
  vars[direction.p] = "+=" + value;