♻️ Use union type and update JSDoc (#2020)

Author: KATO-Hiro

src/lib/utils/workbooks.ts

@@ -1,5 +1,5 @@
 import { Roles } from '$lib/types/user';
-import { type WorkbookList } from '$lib/types/workbook';
+import type { WorkBook, WorkbookList } from '$lib/types/workbook';
 
 import { isAdmin } from '$lib/utils/authorship';
 
@@ -14,7 +14,7 @@ export function canViewWorkBook(role: Roles, isPublished: boolean) {
  * @param workbook - The workbook object containing urlSlug and id properties
  * @returns The URL slug if available, otherwise the workbook ID as a string
  */
-export function getUrlSlugFrom(workbook: WorkbookList): string {
+export function getUrlSlugFrom(workbook: WorkbookList | WorkBook): string {
   const slug = workbook.urlSlug;
 
   return slug ? slug : workbook.id.toString();

src/routes/sitemap.xml/+server.ts

@@ -25,6 +25,11 @@ import { INTERNAL_SERVER_ERROR } from '$lib/constants/http-response-status-codes
  * <?xml version="1.0" encoding="UTF-8"?>
  * <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  *   <url>
+ *     <loc>https://atcoder-novisteps.vercel.app/workbooks/2-sat</loc>
+ *     <changefreq>daily</changefreq>
+ *     <priority>0.8</priority>
+ *   </url>
+ *   <url>
  *     <loc>https://atcoder-novisteps.vercel.app/workbooks/123</loc>
  *     <changefreq>daily</changefreq>
  *     <priority>0.8</priority>
@@ -43,8 +48,7 @@ export const GET: RequestHandler = async () => {
     publishedWorkBookIds = workbooks
       .filter((workbook) => workbook.isPublished)
       .map((workbook) => {
-        // Note: To get the urlSlug, passing an empty string for authorName is sufficient
-        return getUrlSlugFrom({ ...workbook, authorName: '' });
+        return getUrlSlugFrom(workbook);
       });
   } catch (e) {
     const errorMessage = e instanceof Error ? e.message : 'Unknown error';