JAVASCRIPT

GoogleMap: center or defaultCenter property must be defined

function App() {
  const mapRef = useRef(null);
  const [position, setPosition] = useState({
      lat: 41, 
      lng: -71
  });

  function handleLoad(map) {
    mapRef.current = map;
  }

  function handleCenter() {
    if (!mapRef.current) return;

    const newPos = mapRef.current.getCenter().toJSON();
    setPosition(newPos);
  }

  return (
    <GoogleMap
      zoom={4}
      onLoad={handleLoad}
      onDragEnd={handleCenter}
      center={position}
      id="map"
      mapContainerStyle={{
        height: '900px',
        width: '900px'
      }}
    >
   </GoogleMap>
  );
}