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public/scripts/overlays/overlaysNpc.js

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+import customIcons from '../modules/iconsMap.js';
+
+export default async function getOverlayNpc() {
+    const url = `/npcloc`;
+    try {
+        var markers = L.markerClusterGroup({
+            chunkedLoading: true,
+            disableClusteringAtZoom: 8,
+          });
+        const layerNpc = L.layerGroup();
+        const response = await fetch(url);
+        const data = await response.json();
+        let npcLoc = [];
+        data.forEach((npc) => {
+            markers.addLayer(L.marker([npc.locy, npc.locx], { icon: customIcons.yellowNpc }).bindPopup(npc.literalValue));
+        });
+        return markers;
+    } catch (error) {
+        console.error(`Error fetching ${url} data:`, error);
+    }
+}