fix types

Author: cscheid

src/project/types/book/book-config.ts

@@ -257,13 +257,11 @@ export async function bookProjectConfig(
   const footerFiles: string[] = [];
   const pageFooter = resolvePageFooter(config);
   const addFooterItems = (region?: PageFooterRegion) => {
-    if (!region) return;
+    if (!region || typeof region === "string") return;
     for (const item of region) {
-      if (typeof item !== "string") {
-        const navItem = Zod.NavigationItemObject.parse(item);
-        if (navItem.href && !isAbsoluteRef(navItem.href)) {
-          footerFiles.push(navItem.href);
-        }
+      const navItem = Zod.NavigationItemObject.parse(item);
+      if (navItem.href && !isAbsoluteRef(navItem.href)) {
+        footerFiles.push(navItem.href);
       }
     }
   };

src/resources/types/zod/handwritten-schema-types.ts

@@ -109,10 +109,10 @@ export const Base_ZodNavigationItemObject = z.object({
 }).strict().partial();
 
 type NavigationItemObject = z.infer<typeof Base_ZodNavigationItemObject> & {
-  menu: NavigationItem[];
+  menu?: NavigationItem[];
 };
 
 export const ZodNavigationItemObject: z.ZodType<NavigationItemObject> =
   Base_ZodNavigationItemObject.extend({
     menu: z.array(z.lazy(() => ZodNavigationItem)),
-  });
+  }).strict().partial();