Convert ArcGIS features to GeoJSON

You can convert ArcGIS features to GeoJSON using the arcgisToGeoJSON method.
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<html>
  <head>
    <meta charset="utf-8" />
    <title>Convert ArcGIS features to GeoJSON</title>
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@3.0.12/dist/esri-leaflet.js"></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.2.5/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <style>
      html,
      body,
      #map {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
        font-family: Arial, Helvetica, sans-serif;
        font-size: 14px;
        color: #323232;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map");
      L.esri.Vector.vectorBasemapLayer("osm/streets-relief", {
        token: accessToken
      }).addTo(map);

      L.esri.get("https://www.arcgis.com/sharing/content/items/0f8baec0cf64441b8c9c0a17df1148bb/data", {}, function (error, response) {
        if (error) {
          return;
        }

        const arcGISFeatures = response.operationalLayers[0].featureCollection.layers[0].featureSet.features;
        const idField = response.operationalLayers[0].featureCollection.layers[0].layerDefinition.objectIdField;

        // empty geojson feature collection
        const geoJSONFeatureCollection = {
          type: "FeatureCollection",
          features: []
        };

        for (let i = arcGISFeatures.length - 1; i >= 0; i--) {
          // convert ArcGIS Feature to GeoJSON Feature
          const geoJSONFeature = L.esri.Util.arcgisToGeoJSON(arcGISFeatures[i], idField);

          // unproject the web mercator coordinates to lat/lng
          const latlng = L.Projection.Mercator.unproject(L.point(geoJSONFeature.geometry.coordinates));
          geoJSONFeature.geometry.coordinates = [latlng.lng, latlng.lat];

          geoJSONFeatureCollection.features.push(geoJSONFeature);
        }

        const geojsonLayer = L.geoJSON(geoJSONFeatureCollection).addTo(map);
        map.fitBounds(geojsonLayer.getBounds());
      });
    </script>
  </body>
</html>