Added protecting hooks

dist/modules/hooks/validateUniqueRole.d.ts

@@ -0,0 +1,16 @@
+import type { FieldHook } from 'payload';
+/**
+ * Field hook for a System Page role relationship in SiteSettings: ensures a page
+ * isn't assigned to two roles at once (e.g. the same page as both homepage and
+ * privacyPolicy), which would make routing ambiguous.
+ *
+ * Attach to each role field's beforeValidate. `siblingFields` are the OTHER role
+ * field names to check against.
+ *
+ *   hooks: { beforeValidate: [buildValidateUniqueRole({
+ *     siblingFields: ['privacyPolicy', 'cookiePolicy', 'termsOfService'],
+ *   })] }
+ */
+export declare function buildValidateUniqueRole(args: {
+    siblingFields: string[];
+}): FieldHook;