server/aspnetapp/wwwroot/lib/swiper/src/components/mousewheel/mousewheel.js

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import { window, document } from 'ssr-window';
import $ from '../../utils/dom';
import Utils from '../../utils/utils';

function isEventSupported() {
  const eventName = 'onwheel';
  let isSupported = eventName in document;

  if (!isSupported) {
    const element = document.createElement('div');
    element.setAttribute(eventName, 'return;');
    isSupported = typeof element[eventName] === 'function';
  }

  if (!isSupported
    && document.implementation
    && document.implementation.hasFeature
    // always returns true in newer browsers as per the standard.
    // @see http://dom.spec.whatwg.org/#dom-domimplementation-hasfeature
    && document.implementation.hasFeature('', '') !== true
  ) {
    // This is the only way to test support for the `wheel` event in IE9+.
    isSupported = document.implementation.hasFeature('Events.wheel', '3.0');
  }

  return isSupported;
}
const Mousewheel = {
  lastScrollTime: Utils.now(),
  lastEventBeforeSnap: undefined,
  recentWheelEvents: [],
  event() {
    if (window.navigator.userAgent.indexOf('firefox') > -1) return 'DOMMouseScroll';
    return isEventSupported() ? 'wheel' : 'mousewheel';
  },
  normalize(e) {
    // Reasonable defaults
    const PIXEL_STEP = 10;
    const LINE_HEIGHT = 40;
    const PAGE_HEIGHT = 800;

    let sX = 0;
    let sY = 0; // spinX, spinY
    let pX = 0;
    let pY = 0; // pixelX, pixelY

    // Legacy
    if ('detail' in e) {
      sY = e.detail;
    }
    if ('wheelDelta' in e) {
      sY = -e.wheelDelta / 120;
    }
    if ('wheelDeltaY' in e) {
      sY = -e.wheelDeltaY / 120;
    }
    if ('wheelDeltaX' in e) {
      sX = -e.wheelDeltaX / 120;
    }