React에서 leaflet②

import React, { useEffect } from "react";
import L from "leaflet";
import "leaflet/dist/leaflet.css";
import icon from "leaflet/dist/images/marker-icon.png";
import shadow from "leaflet/dist/images/marker-shadow.png";

L.Marker.prototype.options.icon = L.icon({
  iconUrl: icon,
  shadowUrl: shadow,
});

const Map0 = () => {
  useEffect(() => {
    // https://leafletjs.com/index.html
    var map = L.map("map").setView([51.505, -0.09], 13);
    L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
      attribution:
        '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    }).addTo(map);

    L.marker([51.5, -0.09])
      .addTo(map)
      .bindPopup("A pretty CSS3 popup.<br> Easily customizable.")
      .openPopup();

    // https://leafletjs.com/examples/quick-start/
    L.circle([51.508, -0.11], {
      color: "red",
      fillColor: "#f03",
      fillOpacity: 0.5,
      radius: 500,
    }).addTo(map);
    L.polygon([
      [51.509, -0.08],
      [51.503, -0.06],
      [51.51, -0.047],
    ]).addTo(map);
  }, []);
  return <div id="map" style={{ height: "100vh" }}></div>;
};

export default Map0;