Added protecting hooks

dist/modules/hooks/trackSlugHistory.js

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+/**
+ * When a document's slug changes, appends the OLD slug to a `slugHistory` array
+ * field. The project reads slugHistory to serve a 301 redirect from old URLs to
+ * the current one — so changing a slug doesn't 404 the old address (a real SEO
+ * loss / audit finding).
+ *
+ * Requires a `slugHistory` field on the collection:
+ *   { name: 'slugHistory', type: 'array', fields: [{ name: 'slug', type: 'text' }],
+ *     admin: { readOnly: true } }
+ *
+ *   hooks: { beforeChange: [trackSlugHistoryHook] }
+ *
+ * The project then, in resolveRoute or a redirect check, looks up slugHistory and
+ * 301s to the current slug. See docs/hooks.md.
+ */ export const trackSlugHistoryHook = ({ data, originalDoc })=>{
+    const oldSlug = originalDoc?.slug;
+    const newSlug = data.slug;
+    if (typeof oldSlug === 'string' && typeof newSlug === 'string' && oldSlug !== newSlug && oldSlug.length > 0) {
+        const history = Array.isArray(data.slugHistory) ? data.slugHistory : Array.isArray(originalDoc?.slugHistory) ? originalDoc.slugHistory : [];
+        // Avoid duplicates; don't record the new slug itself.
+        if (!history.some((h)=>h?.slug === oldSlug)) {
+            data.slugHistory = [
+                ...history,
+                {
+                    slug: oldSlug
+                }
+            ];
+        }
+    }
+    return data;
+};
+
+//# sourceMappingURL=trackSlugHistory.js.map