frontend/src/lib/prefetchers.ts

@@ -31,13 +31,31 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
 
   const wikiPage = await qc.fetchQuery ({
       queryKey: wikiKeys.show (title, { version }),
-      queryFn:  () => fetchWikiPageByTitle (title, { version }) })
+      queryFn:  async () => {
+	try
+	{
+	  return await fetchWikiPageByTitle (title, { version })
+	}
+	catch
+	{
+	  return null
+	}
+      } })
 
-  const effectiveTitle = wikiPage.title
+  const effectiveTitle = wikiPage?.title ?? title
 
   await qc.prefetchQuery ({
       queryKey: tagsKeys.show (effectiveTitle),
-      queryFn:  () => fetchTagByName (effectiveTitle) })
+      queryFn:  async () => { 
+	try
+	{
+	  return await fetchTagByName (effectiveTitle)
+	}
+	catch
+	{
+	  return null
+	}
+      } })
 
   if (version)
     return
@@ -94,15 +112,13 @@ export const routePrefetchers: { test: (u: URL) => boolean; run:  Prefetcher }[]
     { test: u => u.pathname === '/wiki', run: prefetchWikiPagesIndex },
     { test: u => (!(['/wiki/new', '/wiki/changes'].includes (u.pathname))
 		  && Boolean (mWiki (u.pathname))),
-      run: prefetchWikiPageShow },
-    ]
+      run: prefetchWikiPageShow }]
 
 
 export const prefetchForURL = async (qc: QueryClient, urlLike: string): Promise<void> => {
   const u = new URL (urlLike, location.origin)
-  const jobs = routePrefetchers.filter (r => r.test (u)).map (r => r.run (qc, u))
-  if (jobs.length === 0)
+  const r = routePrefetchers.find (x => x.test (u))
+  if (!(r))
     return
-
-  await Promise.all (jobs)
+  await r.run (qc, u)
 }