promisifiedGetGeo.js

function getCurrentPosition() {
  if (navigator.geolocation) {
    return new Promise((resolve, reject) => {
      navigator.geolocation.getCurrentPosition(resolve, reject);
    });
  } else {
    return Promise.reject('geolocation is not available on this device');
  }
}

// then to use getCurrentPosition
getCurrentPosition()
  .then((position) => {
    console.log('position', position); // logs position object https://developer.mozilla.org/en-US/docs/Web/API/Position
  })
  .catch((error) => {
    // error obtaining user location
    console.log(error) // geolocation is not available on this device
  });