framework7/shared/get-support.js

Full featured mobile HTML framework for building iOS & Android apps

import { getWindow, getDocument } from 'ssr-window';
let support;
function calcSupport() {
  const window = getWindow();
  const document = getDocument();
  return {
    touch: !!('ontouchstart' in window || window.DocumentTouch && document instanceof window.DocumentTouch),
    pointerEvents: !!window.PointerEvent && 'maxTouchPoints' in window.navigator && window.navigator.maxTouchPoints >= 0,
    passiveListener: function checkPassiveListener() {
      let supportsPassive = false;
      try {
        const opts = Object.defineProperty({}, 'passive', {
          // eslint-disable-next-line
          get() {
            supportsPassive = true;
          }
        });
        window.addEventListener('testPassiveListener', null, opts);
      } catch (e) {
        // No support
      }
      return supportsPassive;
    }(),
    intersectionObserver: function checkObserver() {
      return 'IntersectionObserver' in window;
    }()
  };
}
function getSupport() {
  if (!support) {
    support = calcSupport();
  }
  return support;
}
export { getSupport };