/**
 * Passive event listener polyfill
 *
 * Patches addEventListener so scroll-blocking events (touchstart, touchmove,
 * wheel, mousewheel) default to { passive: true } unless explicitly set to
 * false. Eliminates Chrome Violation warnings from third-party libraries.
 */
(function () {
  'use strict';
  var opts = Object.defineProperty({}, 'passive', {
    get: function () { window.__passiveSupported = true; }
  });
  window.addEventListener('test', null, opts);
  if (!window.__passiveSupported) return;

  var orig = EventTarget.prototype.addEventListener;
  var passiveEvents = { touchstart: 1, touchmove: 1, wheel: 1, mousewheel: 1 };

  EventTarget.prototype.addEventListener = function (type, listener, options) {
    if (passiveEvents[type] && typeof options !== 'object') {
      options = { passive: true, capture: options };
    }
    orig.call(this, type, listener, options);
  };
})();