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src/utils/distance.js

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+const toRadians = (value) => (value * Math.PI) / 180;
+
+export function haversineDistanceKm(lat1, lon1, lat2, lon2) {
+  if (
+    !Number.isFinite(lat1) ||
+    !Number.isFinite(lon1) ||
+    !Number.isFinite(lat2) ||
+    !Number.isFinite(lon2)
+  ) {
+    return null;
+  }
+  const R = 6371;
+  const dLat = toRadians(lat2 - lat1);
+  const dLon = toRadians(lon2 - lon1);
+  const a =
+    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+    Math.cos(toRadians(lat1)) * Math.cos(toRadians(lat2)) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
+  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+  return Number((R * c).toFixed(2));
+}