detectTouch.js

export function detectTouch() {
  // source  https://codeburst.io/the-only-way-to-detect-touch-with-javascript-7791a3346685
  window.addEventListener('touchstart', function onFirstTouch() {
    // we could use a class
    document.body.classList.add('user-is-touching');
    // or set some global variable
    // window.USER_IS_TOUCHING = true;
    // or set your app's state however you normally would
    // frameworkOfChoice.dispatchEvent('USER_IS_TOUCHING', true);
    // we only need to know once that a human touched the screen, so we can stop listening now
    window.removeEventListener('touchstart', onFirstTouch, false);
  }, false);
}