refactor: enforce import directions and expose source factories

src/layers/earthquakes/model.js

@@ -99,52 +99,4 @@ export function mapAnalystRecord(raw, index = 0) {
   };
 }
 
-/** Validate a complete feed before replacing the last good earthquake snapshot. */
-export function normalizeEarthquakeSnapshot(geojson) {
-  if (!Array.isArray(geojson?.features)) return null;
-  const rows = [];
-  const ids = new Set();
-  for (const [index, feature] of geojson.features.entries()) {
-    const coordinates = feature?.geometry?.coordinates;
-    const properties = feature?.properties;
-    if (
-      !Array.isArray(coordinates) ||
-      coordinates.length < 2 ||
-      !properties ||
-      typeof properties !== 'object' ||
-      Array.isArray(properties) ||
-      (feature.geometry.type != null && feature.geometry.type !== 'Point')
-    )
-      return null;
-    const [lon, lat, depthKm] = coordinates;
-    const mag = properties.mag;
-    if (
-      !Number.isFinite(lon) ||
-      Math.abs(lon) > 180 ||
-      !Number.isFinite(lat) ||
-      Math.abs(lat) > 90 ||
-      (depthKm != null && !Number.isFinite(depthKm)) ||
-      (mag != null && (!Number.isFinite(mag) || mag > 10))
-    )
-      return null;
-    // A missing magnitude cannot establish that this event meets M2.5+.
-    if (mag == null || mag < 2.5) continue;
-    const stableId =
-      feature.id == null || feature.id === ''
-        ? `event-${index + 1}`
-        : String(feature.id);
-    if (ids.has(stableId)) return null;
-    ids.add(stableId);
-    rows.push({
-      stableId,
-      usgsId: feature.id ?? null,
-      lon,
-      lat,
-      depthKm: depthKm ?? null,
-      mag,
-      place: typeof properties.place === 'string' ? properties.place : null,
-      time: Number.isFinite(properties.time) ? properties.time : null,
-    });
-  }
-  return rows;
-}
+export { normalizeEarthquakeSnapshot } from './records.js';

src/layers/earthquakes/records.js

@@ -0,0 +1,49 @@
+/** Validate a complete feed before replacing the last good earthquake snapshot. */
+export function normalizeEarthquakeSnapshot(geojson) {
+  if (!Array.isArray(geojson?.features)) return null;
+  const rows = [];
+  const ids = new Set();
+  for (const [index, feature] of geojson.features.entries()) {
+    const coordinates = feature?.geometry?.coordinates;
+    const properties = feature?.properties;
+    if (
+      !Array.isArray(coordinates) ||
+      coordinates.length < 2 ||
+      !properties ||
+      typeof properties !== 'object' ||
+      Array.isArray(properties) ||
+      (feature.geometry.type != null && feature.geometry.type !== 'Point')
+    )
+      return null;
+    const [lon, lat, depthKm] = coordinates;
+    const mag = properties.mag;
+    if (
+      !Number.isFinite(lon) ||
+      Math.abs(lon) > 180 ||
+      !Number.isFinite(lat) ||
+      Math.abs(lat) > 90 ||
+      (depthKm != null && !Number.isFinite(depthKm)) ||
+      (mag != null && (!Number.isFinite(mag) || mag > 10))
+    )
+      return null;
+    // A missing magnitude cannot establish that this event meets M2.5+.
+    if (mag == null || mag < 2.5) continue;
+    const stableId =
+      feature.id == null || feature.id === ''
+        ? `event-${index + 1}`
+        : String(feature.id);
+    if (ids.has(stableId)) return null;
+    ids.add(stableId);
+    rows.push({
+      stableId,
+      usgsId: feature.id ?? null,
+      lon,
+      lat,
+      depthKm: depthKm ?? null,
+      mag,
+      place: typeof properties.place === 'string' ? properties.place : null,
+      time: Number.isFinite(properties.time) ? properties.time : null,
+    });
+  }
+  return rows;
+}

src/layers/earthquakes/source.js

@@ -1,4 +1,4 @@
-import { normalizeEarthquakeSnapshot } from './model.js';
+import { normalizeEarthquakeSnapshot } from './records.js';
 const API_URL =
   'https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_day.geojson';
 /** Request and validate a complete USGS snapshot before it can replace displayed events. */