TEST PAGE
const map = L.map('mapDiv').setView([42.2, -120.5], 10);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
const fireLayer = L.geoJSON(null, {
style: { color: 'red', weight: 2, fillOpacity: 0.3 }
}).addTo(map);
fetch('https://services.arcgis.com/.../FeatureServer/0/query?where=1=1&f=geojson')
.then(res => res.json())
.then(data => fireLayer.addData(data));