import "https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"; // window.L

var map = L.map('leaflet-map').setView([0, 0], 2);

L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
  maxZoom: 19,
  attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
}).addTo(map);