window.addEventListener('keydown', (e) => {
  if (e.keyCode === 40 || e.keyCode === 38) {
    console.log('key pressed');
    // invoke totally awesome function here...
  }
}, false);

const autocomplete = new google.maps.places.Autocomplete(field);
autocomplete.bindTo('bounds', map);

autocomplete.addListener('place_changed', () => {
  const place = autocomplete.getPlace();

  if (!place.geometry) return;

  const position = place.geometry.location;
  const coords = { lat: position.lat(), lng: position.lng() };
  const address = field.value;
});

autocomplete.addListener('keydown', () => {
  console.log('you did it!');
});