testGeolocation.js

const testGeolocation = function() {
  if ('permissions' in navigator) {
    navigator.permissions.query({name:'geolocation'}).then(function(response) {
      if (response.state == 'prompt') {
        // do stuff for permission request
      } else if (response.state == 'denied') {
        // do stuff for permission denied
      } else {
        // do stuff for permission granted
      }
    }
  } else {
    navigator.geolocation.getCurrentPosition(
      function(response) {
        // do success things
      }, 
      function(response) {
        if (response.code == response.PERMISSION_DENIED) {
          // do stuff when they deny location
        } else {
          // do stuff when location fails for other reasons
        }
      }, 
      {
        maximumAge: Infinity,
        timeout:0
      }
    );
  }
};