プリフェッチ実装（#140） (#256)

Merge branch 'main' into feature/140

#140

Merge remote-tracking branch 'origin/main' into feature/140

#140

#140

#140

#140

#140

Merge remote-tracking branch 'origin/main' into feature/140

#140

#140

#140

#140

#140

#140

#140

#140

#140

#140

#140

Merge remote-tracking branch 'origin/main' into feature/140

Merge remote-tracking branch 'origin/main' into feature/140

#140 ぼちぼち

Merge remote-tracking branch 'origin/main' into feature/140

#140

#140

#140

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: https://git.miteruzo.com/miteruzo/btrc-hub/pulls/256

frontend/src/App.tsx

@@ -1,5 +1,3 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { AnimatePresence, LayoutGroup } from 'framer-motion'
 import { useEffect, useState } from 'react'
 import { BrowserRouter,
@@ -11,7 +9,7 @@ import { BrowserRouter,
 import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
-import { API_BASE_URL } from '@/config'
+import { apiPost, isApiError } from '@/lib/api'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
@@ -75,12 +73,11 @@ export default (() => {
 
   useEffect (() => {
     const createUser = async () => {
-      const res = await axios.post (`${ API_BASE_URL }/users`)
-      const data = res.data as { code: string; user: any }
+      const data = await apiPost<{ code: string; user: User }> ('/users')
       if (data.code)
 	{
 	  localStorage.setItem ('user_code', data.code)
-	  setUser (toCamel (data.user, { deep: true }) as User)
+	  setUser (data.user)
 	}
     }
 
@@ -90,17 +87,16 @@ export default (() => {
 	void (async () => {
 	  try
 	  {
-	    const res = await axios.post (`${ API_BASE_URL }/users/verify`, { code })
-	    const data = res.data as { valid: boolean, user: any }
+	    const data = await apiPost<{ valid: boolean; user: User }> ('/users/verify', { code })
 	    if (data.valid)
-	      setUser (toCamel (data.user, { deep: true }))
+	      setUser (data.user)
 	    else
 	      await createUser ()
 	  }
 	  catch (err)
 	  {
-	    if (axios.isAxiosError (err))
-	      setStatus (err.status ?? 200)
+	    if (isApiError (err))
+	      setStatus (err.response?.status ?? 200)
 	  }
 	}) ()
       }

frontend/src/components/PostEditForm.tsx

@@ -1,12 +1,10 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useEffect, useState } from 'react'
 
 import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
 import Label from '@/components/common/Label'
 import { Button } from '@/components/ui/button'
-import { API_BASE_URL } from '@/config'
+import { apiPut } from '@/lib/api'
 
 import type { FC } from 'react'
 
@@ -41,14 +39,11 @@ export default (({ post, onSave }: Props) => {
   const [tags, setTags] = useState<string> ('')
 
   const handleSubmit = async () => {
-    const res = await axios.put (
-	`${ API_BASE_URL }/posts/${ post.id }`,
-	{ title, tags,
-	  original_created_from: originalCreatedFrom,
+    const data = await apiPut<Post> (
+	`/posts/${ post.id }`,
+	{ title, tags, original_created_from: originalCreatedFrom,
 	  original_created_before: originalCreatedBefore },
-	{ headers: { 'Content-Type':     'multipart/form-data',
-		     'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
-    const data = toCamel (res.data as any, { deep: true }) as Post
+	{ headers: { 'Content-Type': 'multipart/form-data' } })
     onSave ({ ...post,
 	      title:                  data.title,
 	      tags:                   data.tags,

frontend/src/components/PostFormTagsArea.tsx

@@ -1,11 +1,9 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useRef, useState } from 'react'
 
 import TagSearchBox from '@/components/TagSearchBox'
 import Label from '@/components/common/Label'
 import TextArea from '@/components/common/TextArea'
-import { API_BASE_URL } from '@/config'
+import { apiGet } from '@/lib/api'
 
 import type { FC, SyntheticEvent } from 'react'
 
@@ -59,8 +57,7 @@ export default (({ tags, setTags }: Props) => {
   const recompute = async (pos: number, v: string = tags) => {
     const { start, end, token } = getTokenAt (v, pos)
     setBounds ({ start, end })
-    const res = await axios.get (`${ API_BASE_URL }/tags/autocomplete`, { params: { q: token } })
-    const data = toCamel (res.data as any, { deep: true }) as Tag[]
+    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q: token } })
     setSuggestions (data.filter (t => t.postCount > 0))
     setSuggestionsVsbl (suggestions.length > 0)
   }

frontend/src/components/PostList.tsx

@@ -21,53 +21,50 @@ export default (({ posts, onClick }: Props) => {
   const cardRef = useRef<HTMLDivElement> (null)
 
   return (
-      <>
-	<div className="flex flex-wrap gap-6 p-4">
-	  {posts.map ((post, i) => {
-	    const id2 = `page-${ post.id }`
-	    const layoutId = id2
+      <div className="flex flex-wrap gap-6 p-4">
+	{posts.map ((post, i) => {
+	  const sharedId = `page-${ post.id }`
+	  const layoutId = sharedId
 
-	    return (
-		<PrefetchLink
-		    to={`/posts/${ post.id }`}
-		    key={post.id}
-		    className="w-40 h-40"
-		    state={{ sharedId: `page-${ post.id }` }}
-		    onClick={e => {
-		      const sharedId = `page-${ post.id }`
-		      setForLocationKey (location.key, sharedId)
-		      onClick?.(e)
-		    }}>
-		  <motion.div
-		      ref={cardRef}
-		      layoutId={layoutId}
-		      className="w-full h-full overflow-hidden rounded-xl shadow
-				 transform-gpu will-change-transform"
-		      whileHover={{ scale: 1.02 }}
-		      onLayoutAnimationStart={() => {
-			if (cardRef.current)
-			  {
-			    cardRef.current.style.position = 'relative'
-			    cardRef.current.style.zIndex = '9999'
-			  }
-		      }}
-		      onLayoutAnimationComplete={() => {
-			if (cardRef.current)
-			  {
-			    cardRef.current.style.zIndex = ''
-			    cardRef.current.style.position = ''
-			  }
-		      }}
-		      transition={{ type: 'spring', stiffness: 500, damping: 40, mass: .5 }}>
-		    <img src={post.thumbnail || post.thumbnailBase || undefined}
-			 alt={post.title || post.url}
-			 title={post.title || post.url || undefined}
-			 loading={i < 12 ? 'eager' : 'lazy'}
-			 decoding="async"
-			 className="object-cover w-full h-full"/>
-		  </motion.div>
-		</PrefetchLink>)
-	  })}
-	</div>
-      </>)
+	  return (
+	      <PrefetchLink
+		  to={`/posts/${ post.id }`}
+		  key={post.id}
+		  className="w-40 h-40"
+		  state={{ sharedId }}
+		  onClick={e => {
+		    setForLocationKey (location.key, sharedId)
+		    onClick?.(e)
+		  }}>
+		<motion.div
+		    ref={cardRef}
+		    layoutId={layoutId}
+		    className="w-full h-full overflow-hidden rounded-xl shadow
+			       transform-gpu will-change-transform"
+		    whileHover={{ scale: 1.02 }}
+		    onLayoutAnimationStart={() => {
+		      if (!(cardRef.current))
+			return
+
+		      cardRef.current.style.position = 'relative'
+		      cardRef.current.style.zIndex = '9999'
+		    }}
+		    onLayoutAnimationComplete={() => {
+		      if (!(cardRef.current))
+			return 
+
+		      cardRef.current.style.zIndex = ''
+		      cardRef.current.style.position = ''
+		    }}
+		    transition={{ type: 'spring', stiffness: 500, damping: 40, mass: .5 }}>
+		  <img src={post.thumbnail || post.thumbnailBase || undefined}
+		       alt={post.title || post.url}
+		       title={post.title || post.url || undefined}
+		       loading={i < 12 ? 'eager' : 'lazy'}
+		       decoding="async"
+		       className="object-cover w-full h-full"/>
+		</motion.div>
+	      </PrefetchLink>)
+	})}
+      </div>)
 }) satisfies FC<Props>

frontend/src/components/TagDetailSidebar.tsx

@@ -6,21 +6,19 @@ import { DndContext,
 	 useSensor,
 	 useSensors } from '@dnd-kit/core'
 import { restrictToWindowEdges } from '@dnd-kit/modifiers'
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { AnimatePresence, motion } from 'framer-motion'
 import { useEffect, useRef, useState } from 'react'
-import { Link } from 'react-router-dom'
 
 import DraggableDroppableTagRow from '@/components/DraggableDroppableTagRow'
+import PrefetchLink from '@/components/PrefetchLink'
 import TagLink from '@/components/TagLink'
 import TagSearch from '@/components/TagSearch'
 import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL } from '@/config'
 import { CATEGORIES } from '@/consts'
+import { apiDelete, apiGet, apiPatch, apiPost } from '@/lib/api'
 
 import type { DragEndEvent } from '@dnd-kit/core'
 import type { FC, MutableRefObject, ReactNode } from 'react'
@@ -132,10 +130,7 @@ const changeCategory = async (
     tagId:    number,
     category: Category,
 ): Promise<void> => {
-  await axios.patch (
-      `${ API_BASE_URL }/tags/${ tagId }`,
-      { category },
-      { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') ?? '' } })
+  await apiPatch (`/tags/${ tagId }`, { category })
 }
 
 
@@ -170,12 +165,7 @@ export default (({ post }: Props) => {
     if (!(post))
       return
 
-    const res = await axios.get (
-	`${ API_BASE_URL }/posts/${ post.id }`,
-	{ headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') ?? '' } })
-    const data = toCamel (res.data as any, { deep: true }) as Post
-
-    setTags (buildTagByCategory (data))
+    setTags (buildTagByCategory (await apiGet<Post> (`/posts/${ post.id }`)))
   }
 
   const onDragEnd = async (e: DragEndEvent) => {
@@ -216,16 +206,9 @@ export default (({ post }: Props) => {
 	    return
 
 	  if (fromParentId != null)
-	    {
-	      await axios.delete (
-		  `${ API_BASE_URL }/tags/${ fromParentId }/children/${ childId }`,
-		  { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') ?? '' } })
-	    }
+	    await apiDelete (`/tags/${ fromParentId }/children/${ childId }`)
 
-	  await axios.post (
-	      `${ API_BASE_URL }/tags/${ parentId }/children/${ childId }`,
-	      { },
-	      { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') ?? '' } })
+	  await apiPost (`/tags/${ parentId }/children/${ childId }`, { })
 
 	  await reloadTags ()
 	  toast ({
@@ -245,11 +228,7 @@ export default (({ post }: Props) => {
 	    await changeCategory (childId, cat)
 
 	  if (fromParentId != null)
-	    {
-	      await axios.delete (
-		  `${ API_BASE_URL }/tags/${ fromParentId }/children/${ childId }`,
-		  { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') ?? '' } })
-	    }
+	    await apiDelete (`/tags/${ fromParentId }/children/${ childId }`)
 
 	  const fromParent = fromParentId == null ? null : findTag (tags, fromParentId)
 
@@ -358,9 +337,9 @@ export default (({ post }: Props) => {
 		      <>耕作者: </>
 		      {post.uploadedUser
 		       ? (
-			  <Link to={`/users/${ post.uploadedUser.id }`}>
+			  <PrefetchLink to={`/users/${ post.uploadedUser.id }`}>
 			    {post.uploadedUser.name || '名もなきニジラー'}
-			  </Link>)
+			  </PrefetchLink>)
 		       : 'bot操作'}
 		    </li>
 		    */}
@@ -389,7 +368,7 @@ export default (({ post }: Props) => {
 			  </>)}
 		    </li>
 		    <li>
-		      <Link to={`/posts/changes?id=${ post.id }`}>履歴</Link>
+		      <PrefetchLink to={`/posts/changes?id=${ post.id }`}>履歴</PrefetchLink>
 		    </li>
 		  </ul>
 		</div>)}

frontend/src/components/TagLink.tsx

@@ -1,29 +1,34 @@
-import axios from 'axios'
 import { useEffect, useState } from 'react'
-import { Link } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
-import { API_BASE_URL } from '@/config'
 import { LIGHT_COLOUR_SHADE, DARK_COLOUR_SHADE, TAG_COLOUR } from '@/consts'
+import { apiGet } from '@/lib/api'
 import { cn } from '@/lib/utils'
 
 import type { ComponentProps, FC, HTMLAttributes } from 'react'
 
 import type { Tag } from '@/types'
 
-type CommonProps = { tag:         Tag
-		     nestLevel?:  number
-		     withWiki?:   boolean
-		     withCount?:  boolean
-		     prefetch?:   boolean }
+type CommonProps = { 
+    tag:        Tag
+    nestLevel?: number
+    withWiki?:  boolean
+    withCount?: boolean
+    prefetch?:  boolean }
 
 type PropsWithLink =
-    CommonProps & { linkFlg?: true } & Partial<ComponentProps<typeof Link>>
+    & CommonProps
+    & { linkFlg?: true }
+    & Partial<ComponentProps<typeof PrefetchLink>>
 
 type PropsWithoutLink =
-    CommonProps & { linkFlg: false } & Partial<HTMLAttributes<HTMLSpanElement>>
+    & CommonProps
+    & { linkFlg: false }
+    & Partial<HTMLAttributes<HTMLSpanElement>>
 
-type Props = PropsWithLink | PropsWithoutLink
+type Props =
+    | PropsWithLink
+    | PropsWithoutLink
 
 
 export default (({ tag,
@@ -46,7 +51,7 @@ export default (({ tag,
 
     try
     {
-      await axios.get (`${ API_BASE_URL }/wiki/title/${ encodeURIComponent (tagName) }/exists`)
+      await apiGet (`/wiki/title/${ encodeURIComponent (tagName) }/exists`)
       setHavingWiki (true)
     }
     catch
@@ -76,17 +81,17 @@ export default (({ tag,
 	    <span className="mr-1">
 	      {havingWiki
 	       ? (
-		  <Link to={`/wiki/${ encodeURIComponent (tag.name) }`}
+		  <PrefetchLink to={`/wiki/${ encodeURIComponent (tag.name) }`}
 			className={linkClass}>
 		    ?
-		  </Link>)
+		  </PrefetchLink>)
 	       : (
-		  <Link to={`/wiki/${ encodeURIComponent (tag.name) }`}
+		  <PrefetchLink to={`/wiki/${ encodeURIComponent (tag.name) }`}
 			className="animate-[wiki-blink_.25s_steps(2,end)_infinite]
 				   dark:animate-[wiki-blink-dark_.25s_steps(2,end)_infinite]"
 			title={`${ tag.name } Wiki が存在しません．`}>
 		    !
-		  </Link>)}
+		  </PrefetchLink>)}
 	    </span>)}
 	{nestLevel > 0 && (
 	    <span
@@ -110,12 +115,12 @@ export default (({ tag,
 		  {...props}>
 		{tag.name}
 	      </PrefetchLink>
-	    : <Link
+	    : <PrefetchLink
 		  to={`/posts?${ (new URLSearchParams ({ tags: tag.name })).toString () }`}
 		  className={linkClass}
 		  {...props}>
 		{tag.name}
-	      </Link>)
+	      </PrefetchLink>)
 	 : (
 	    <span className={spanClass}
 		  {...props}>

frontend/src/components/TagSearch.tsx

@@ -1,13 +1,11 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
-import React, { useEffect, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { useNavigate, useLocation } from 'react-router-dom'
 
-import { API_BASE_URL } from '@/config'
+import { apiGet } from '@/lib/api'
 
 import TagSearchBox from './TagSearchBox'
 
-import type { FC } from 'react'
+import type { ChangeEvent, FC, KeyboardEvent } from 'react'
 
 import type { Tag } from '@/types'
 
@@ -21,7 +19,7 @@ export default (() => {
   const [suggestions, setSuggestions] = useState<Tag[]> ([])
   const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
 
-  const whenChanged = async (ev: React.ChangeEvent<HTMLInputElement>) => {
+  const whenChanged = async (ev: ChangeEvent<HTMLInputElement>) => {
     setSearch (ev.target.value)
 
     const q = ev.target.value.trim ().split (' ').at (-1)
@@ -31,14 +29,13 @@ export default (() => {
 	return
       }
 
-    const res = await axios.get (`${ API_BASE_URL }/tags/autocomplete`, { params: { q } })
-    const data = toCamel (res.data, { deep: true }) as Tag[]
+    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q } })
     setSuggestions (data.filter (t => t.postCount > 0))
     if (suggestions.length > 0)
       setSuggestionsVsbl (true)
   }
 
-  const handleKeyDown = (ev: React.KeyboardEvent<HTMLInputElement>) => {
+  const handleKeyDown = (ev: KeyboardEvent<HTMLInputElement>) => {
     switch (ev.key)
     {
     case 'ArrowDown':

frontend/src/components/TagSidebar.tsx

@@ -1,4 +1,3 @@
-import axios from 'axios'
 import { AnimatePresence, motion } from 'framer-motion'
 import { useEffect, useState } from 'react'
 import { useLocation, useNavigate } from 'react-router-dom'
@@ -7,8 +6,8 @@ import TagLink from '@/components/TagLink'
 import TagSearch from '@/components/TagSearch'
 import SectionTitle from '@/components/common/SectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
-import { API_BASE_URL } from '@/config'
 import { CATEGORIES } from '@/consts'
+import { apiGet } from '@/lib/api'
 
 import type { FC, MouseEvent } from 'react'
 
@@ -77,10 +76,10 @@ export default (({ posts, onClick }: Props) => {
 		 void ((async () => {
 		   try
 		   {
-		     const { data } = await axios.get (`${ API_BASE_URL }/posts/random`,
-			 { params: { tags:  tagsQuery.split (' ').filter (e => e !== '').join (' '),
+		     const data = await apiGet<Post> ('/posts/random',
+			 { params: { tags: tagsQuery.split (' ').filter (e => e !== '').join (' '),
 				     match: (anyFlg ? 'any' : 'all') } })
-		     navigate (`/posts/${ (data as Post).id }`)
+		     navigate (`/posts/${ data.id }`)
 		   }
 		   catch
 		   {

frontend/src/components/TopNav.tsx

@@ -1,3 +1,4 @@
+import { useQuery } from '@tanstack/react-query'
 import { AnimatePresence, motion } from 'framer-motion'
 import { Fragment, useEffect, useLayoutEffect, useRef, useState } from 'react'
 import { useLocation } from 'react-router-dom'
@@ -6,6 +7,7 @@ import Separator from '@/components/MenuSeparator'
 import PrefetchLink from '@/components/PrefetchLink'
 import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
+import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTagByName } from '@/lib/tags'
 import { cn } from '@/lib/utils'
 import { fetchWikiPage } from '@/lib/wiki'
@@ -44,11 +46,26 @@ export default (({ user }: Props) => {
       visible:  false })
   const [menuOpen, setMenuOpen] = useState (false)
   const [openItemIdx, setOpenItemIdx] = useState (-1)
-  const [postCount, setPostCount] = useState<number | null> (null)
   const [wikiId, setWikiId] = useState<number | null> (WikiIdBus.get ())
 
+  const wikiIdStr = String (wikiId ?? '')
+
+  const { data: wikiPage } = useQuery ({
+      enabled: Boolean (wikiIdStr),
+      queryKey: wikiKeys.show (wikiIdStr, { }),
+      queryFn: () => fetchWikiPage (wikiIdStr, { }) })
+
+  const effectiveTitle = wikiPage?.title ?? ''
+
+  const { data: tag } = useQuery ({
+      enabled: Boolean (effectiveTitle),
+      queryKey: tagsKeys.show (effectiveTitle),
+      queryFn: () => fetchTagByName (effectiveTitle) })
+
+  const postCount = tag?.postCount ?? 0
+
   const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (location.pathname) && wikiId)
-  const wikiTitle = location.pathname.split ('/')[2]
+  const wikiTitle = location.pathname.split ('/')[2] ?? ''
   const menu: Menu = [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
@@ -113,26 +130,6 @@ export default (({ user }: Props) => {
 	location.pathname.startsWith (item.base || item.to))))
   }, [location])
 
-  useEffect (() => {
-    if (!(wikiId))
-      return
-
-    const fetchPostCount = async () => {
-      try
-      {
-	const wikiPage = await fetchWikiPage (String (wikiId ?? ''))
-	const tag = await fetchTagByName (wikiPage.title)
-
-	setPostCount (tag.postCount)
-      }
-      catch
-      {
-	setPostCount (0)
-      }
-    }
-    fetchPostCount ()
-  }, [wikiId])
-
   return (
       <>
 	<nav className="px-3 flex justify-between items-center w-full min-h-[48px]

frontend/src/components/TopNavUser.tsx

@@ -1,6 +1,5 @@
-import { Link } from 'react-router-dom'
-
 import Separator from '@/components/MenuSeparator'
+import PrefetchLink from '@/components/PrefetchLink'
 import { cn } from '@/lib/utils'
 
 import type { FC } from 'react'
@@ -24,9 +23,9 @@ export default (({ user, sp }: Props) => {
   return (
       <>
 	{sp && <Separator/>}
-	<Link to="/users/settings"
+	<PrefetchLink to="/users/settings"
 	      className={className}>
 	  {user.name || '名もなきニジラー'}
-	</Link>
+	</PrefetchLink>
       </>)
 }) satisfies FC<Props>

frontend/src/components/WikiBody.tsx

@@ -1,20 +1,18 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
-import { useEffect, useMemo, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useMemo } from 'react'
 import ReactMarkdown from 'react-markdown'
-import { Link } from 'react-router-dom'
 import remarkGFM from 'remark-gfm'
 
+import PrefetchLink from '@/components/PrefetchLink'
 import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
-import { API_BASE_URL } from '@/config'
+import { wikiKeys } from '@/lib/queryKeys'
 import remarkWikiAutoLink from '@/lib/remark-wiki-autolink'
+import { fetchWikiPages } from '@/lib/wiki'
 
 import type { FC } from 'react'
 import type { Components } from 'react-markdown'
 
-import type { WikiPage } from '@/types'
-
 type Props = { title: string
 	       body?: string }
 
@@ -24,7 +22,7 @@ const mdComponents = { h1:  ({ children }) => <SectionTitle>{children}</SectionT
 		       ul:  ({ children }) => <ul className="list-disc pl-6">{children}</ul>,
 		       a:   (({ href, children }) => (
 				['/', '.'].some (e => href?.startsWith (e))
-			        ? <Link to={href!}>{children}</Link>
+			        ? <PrefetchLink to={href!}>{children}</PrefetchLink>
 			        : (
 				    <a href={href}
 				       target="_blank"
@@ -34,26 +32,15 @@ const mdComponents = { h1:  ({ children }) => <SectionTitle>{children}</SectionT
 
 
 export default (({ title, body }: Props) => {
-  const [pageNames, setPageNames] = useState<string[]> ([])
+  const { data } = useQuery ({
+      enabled: Boolean (body),
+      queryKey: wikiKeys.index ({ }),
+      queryFn: () => fetchWikiPages ({ }) })
+  const pageNames = (data ?? []).map (page => page.title).sort ((a, b) => b.length - a.length)
 
   const remarkPlugins = useMemo (
       () => [() => remarkWikiAutoLink (pageNames), remarkGFM], [pageNames])
 
-  useEffect (() => {
-    void (async () => {
-      try
-      {
-	const res = await axios.get (`${ API_BASE_URL }/wiki`)
-	const data: WikiPage[] = toCamel (res.data as any, { deep: true })
-	setPageNames (data.map (page => page.title).sort ((a, b) => b.length - a.length))
-      }
-      catch
-      {
-	setPageNames ([])
-      }
-    }) ()
-  }, [])
-
   return (
       <ReactMarkdown components={mdComponents} remarkPlugins={remarkPlugins}>
 	{body || `このページは存在しません。[新規作成してください](/wiki/new?title=${ encodeURIComponent (title) })。`}

frontend/src/components/users/InheritDialogue.tsx

@@ -1,5 +1,3 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useState } from 'react'
 
 import { Button } from '@/components/ui/button'
@@ -8,7 +6,7 @@ import { Dialog,
          DialogTitle } from '@/components/ui/dialog'
 import { Input } from '@/components/ui/input'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL } from '@/config'
+import { apiPost } from '@/lib/api'
 
 import type { User } from '@/types'
 
@@ -26,12 +24,12 @@ export default ({ visible, onVisibleChange, setUser }: Props) => {
 
     try
     {
-      const res = await axios.post (`${ API_BASE_URL }/users/verify`, { code: inputCode })
-      const data = res.data as { valid: boolean; user: any }
+      const data = await apiPost<{ valid: boolean; user: User }> (
+	  '/users/verify', { code: inputCode })
       if (data.valid)
 	{
 	  localStorage.setItem ('user_code', inputCode)
-	  setUser (toCamel (data.user, { deep: true }))
+	  setUser (data.user)
 	  toast ({ title: '引継ぎ成功!' })
 	  onVisibleChange (false)
 	}

frontend/src/components/users/UserCodeDialogue.tsx

@@ -1,11 +1,9 @@
-import axios from 'axios'
-
 import { Button } from '@/components/ui/button'
 import { Dialog,
 	 DialogContent,
 	 DialogTitle } from '@/components/ui/dialog'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL } from '@/config'
+import { apiPost } from '@/lib/api'
 
 import type { User } from '@/types'
 
@@ -23,10 +21,8 @@ export default ({ visible, onVisibleChange, user, setUser }: Props) => {
     if (!(confirm ('引継ぎコードを再発行しますか?\n再発行するとほかのブラウザからはログアウトされます．')))
       return
 
-    const res = await axios.post (`${ API_BASE_URL }/users/code/renew`, { }, { headers: {
-	'Content-Type':     'multipart/form-data',
-	'X-Transfer-Code':  localStorage.getItem ('user_code') || '' } })
-    const data = res.data as { code: string }
+    const data = await apiPost<{ code: string }> ('/users/code/renew', { },
+	{ headers: { 'Content-Type': 'multipart/form-data' } })
     if (data.code)
       {
 	localStorage.setItem ('user_code', data.code)

frontend/src/lib/api.ts

@@ -3,9 +3,12 @@ import toCamel from 'camelcase-keys'
 
 import { API_BASE_URL } from '@/config'
 
+import type { AxiosError, AxiosRequestConfig } from 'axios'
+
 type Opt = {
-    params?:  Record<string, unknown>
-    headers?: Record<string, string> }
+    params?:        AxiosRequestConfig['params']
+    headers?:       Record<string, string>
+    responseType?:  'blob' }
 
 const client = axios.create ({ baseURL: API_BASE_URL })
 
@@ -23,6 +26,8 @@ const apiP = async <T> (
     opt?:   Opt,
 ): Promise<T> => {
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
+  if (opt?.responseType === 'blob')
+    return res.data as T
   return toCamel (res.data as any, { deep: true }) as T
 }
 
@@ -32,6 +37,8 @@ export const apiGet = async <T> (
     opt?: Opt,
 ): Promise<T> => {
   const res = await client.get (path, withUserCode (opt))
+  if (opt?.responseType === 'blob')
+    return res.data as T
   return toCamel (res.data as any, { deep: true }) as T
 }
 
@@ -63,3 +70,6 @@ export const apiDelete = async (
 ): Promise<void> => {
   await client.delete (path, withUserCode (opt))
 }
+
+
+export const isApiError = (err: unknown): err is AxiosError => axios.isAxiosError (err)

frontend/src/lib/posts.ts

@@ -1,6 +1,6 @@
 import { apiDelete, apiGet, apiPost } from '@/lib/api'
 
-import type { Post } from '@/types'
+import type { Post, PostTagChange } from '@/types'
 
 
 export const fetchPosts = async (
@@ -13,8 +13,8 @@ export const fetchPosts = async (
 ): Promise<{
     posts:      Post[]
     count:      number
-    nextCursor: string }> => await apiGet ('/posts', {
-	params: {
+    nextCursor: string }> =>
+	await apiGet ('/posts', { params: {
 	    tags,
 	    match,
 	    ...(page && { page }),
@@ -25,6 +25,17 @@ export const fetchPosts = async (
 export const fetchPost = async (id: string): Promise<Post> => await apiGet (`/posts/${ id }`)
 
 
+export const fetchPostChanges = async (
+    { id, page, limit }: {
+	id?:    string
+	page:   number
+	limit:  number },
+): Promise<{
+    changes:  PostTagChange[]
+    count:    number }> =>
+	await apiGet ('/posts/changes', { params: { ...(id && { id }), page, limit } })
+
+
 export const toggleViewedFlg = async (id: string, viewed: boolean): Promise<void> => {
   await (viewed ? apiPost : apiDelete) (`/posts/${ id }/viewed`)
 }

frontend/src/lib/prefetchers.ts

@@ -1,12 +1,69 @@
 import { QueryClient } from '@tanstack/react-query'
 import { match } from 'path-to-regexp'
 
-import { fetchPost, fetchPosts } from '@/lib/posts'
-import { postsKeys } from '@/lib/queryKeys'
+import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
+import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
+import { fetchTagByName } from '@/lib/tags'
+import { fetchWikiPage,
+	 fetchWikiPageByTitle,
+	 fetchWikiPages } from '@/lib/wiki'
 
 type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 
 const mPost = match<{ id: string }> ('/posts/:id')
+const mWiki = match<{ title: string }> ('/wiki/:title')
+
+
+const prefetchWikiPagesIndex: Prefetcher = async (qc, url) => {
+  const title = url.searchParams.get ('title') ?? ''
+
+  await qc.prefetchQuery ({
+      queryKey: wikiKeys.index ({ title }),
+      queryFn:  () => fetchWikiPages ({ title }) })
+}
+
+
+const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
+  const m = mWiki (url.pathname)
+  if (!(m))
+    return
+
+  const title = decodeURIComponent (m.params.title)
+  const version = url.searchParams.get ('version') || undefined
+
+  const wikiPage = await qc.fetchQuery ({
+      queryKey: wikiKeys.show (title, { version }),
+      queryFn:  () => fetchWikiPageByTitle (title, { version }) })
+
+  if (wikiPage)
+    {
+      const effectiveId = String (wikiPage.id ?? '')
+      await qc.prefetchQuery ({
+	  queryKey: wikiKeys.show (effectiveId, { }),
+	  queryFn: () => fetchWikiPage (effectiveId, { } ) })
+
+      if (wikiPage.body)
+	{
+	  await qc.prefetchQuery ({
+	      queryKey: wikiKeys.index ({ }),
+	      queryFn: () => fetchWikiPages ({ }) })
+	}
+    }
+
+  const effectiveTitle = wikiPage?.title ?? title
+
+  await qc.prefetchQuery ({
+      queryKey: tagsKeys.show (effectiveTitle),
+      queryFn: () => fetchTagByName (effectiveTitle) })
+
+  if (version)
+    return
+
+  const p = { tags: effectiveTitle, match: 'all', page: 1, limit: 8 } as const
+  await qc.prefetchQuery ({
+      queryKey: postsKeys.index (p),
+      queryFn:  () => fetchPosts (p) })
+}
 
 
 const prefetchPostsIndex: Prefetcher = async (qc, url) => {
@@ -14,6 +71,7 @@ const prefetchPostsIndex: Prefetcher = async (qc, url) => {
   const m = url.searchParams.get ('match') === 'any' ? 'any' : 'all'
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
+
   await qc.prefetchQuery ({
       queryKey: postsKeys.index ({ tags, match: m, page, limit }),
       queryFn:  () => fetchPosts ({ tags, match: m, page, limit }) })
@@ -26,24 +84,40 @@ const prefetchPostShow: Prefetcher = async (qc, url) => {
     return
 
   const { id } = m.params
+
   await qc.prefetchQuery ({
       queryKey: postsKeys.show (id),
       queryFn:  () => fetchPost (id) })
 }
 
 
-export const routePrefetchers: {
-    test: (u: URL) => boolean
-    run:  Prefetcher }[] = [
+const prefetchPostChanges: Prefetcher = async (qc, url) => {
+  const id = url.searchParams.get ('id')
+  const page = Number (url.searchParams.get ('page') || 1)
+  const limit = Number (url.searchParams.get ('limit') || 20)
+
+  await qc.prefetchQuery ({
+      queryKey: postsKeys.changes ({ ...(id && { id }), page, limit }),
+      queryFn:  () => fetchPostChanges ({ ...(id && { id }), page, limit }) })
+}
+
+
+export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[] = [
     { test: u => u.pathname === '/' || u.pathname === '/posts', run: prefetchPostsIndex },
-    { test: u => Boolean (mPost (u.pathname)), run: prefetchPostShow }]
+    { test: u => (!(['/posts/new', '/posts/changes'].includes (u.pathname))
+		  && Boolean (mPost (u.pathname))),
+      run: prefetchPostShow },
+    { test: u => u.pathname === '/posts/changes', run: prefetchPostChanges },
+    { test: u => u.pathname === '/wiki', run: prefetchWikiPagesIndex },
+    { test: u => (!(['/wiki/new', '/wiki/changes'].includes (u.pathname))
+		  && Boolean (mWiki (u.pathname))),
+      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)
 }

frontend/src/lib/queryKeys.ts

@@ -3,8 +3,15 @@ export const postsKeys = {
     index:    (p: { tags: string; match: 'any' | 'all'; page: number; limit: number }) =>
 		  ['posts', 'index', p] as const,
     show:     (id: string) => ['posts', id] as const,
-    related:  (id: string) => ['related', id] as const }
+    related:  (id: string) => ['related', id] as const,
+    changes:  (p: { id?: string; page: number; limit: number }) =>
+		  ['posts', 'changes', p] as const }
+
+export const tagsKeys = {
+    root: ['tags'] as const,
+    show: (name: string) => ['tags', name] as const }
 
 export const wikiKeys = {
-    root: ['wiki'] as const,
-    show: (title: string, p: { version: string }) => ['wiki', title, p] as const }
+    root:   ['wiki'] as const,
+    index:  (p: { title?: string }) => ['wiki', 'index', p] as const,
+    show:   (title: string, p: { version?: string }) => ['wiki', title, p] as const }

frontend/src/lib/tags.ts

@@ -3,5 +3,13 @@ import { apiGet } from '@/lib/api'
 import type { Tag } from '@/types'
 
 
-export const fetchTagByName = async (name: string): Promise<Tag> =>
-    await apiGet (`/tags/name/${ name }`)
+export const fetchTagByName = async (name: string): Promise<Tag | null> => {
+  try
+  {
+    return await apiGet (`/tags/name/${ name }`)
+  }
+  catch
+  {
+    return null
+  }
+}

frontend/src/lib/wiki.ts

@@ -3,12 +3,29 @@ import { apiGet } from '@/lib/api'
 import type { WikiPage } from '@/types'
 
 
-export const fetchWikiPage = async (id: string): Promise<WikiPage> =>
-    await apiGet (`/wiki/${ id }`)
+export const fetchWikiPages = async (
+    { title }:  { title?: string },
+): Promise<WikiPage[]> =>
+    await apiGet ('/wiki', { params: { title } })
+
+
+export const fetchWikiPage = async (
+    id:           string,
+    { version }:  { version?: string },
+): Promise<WikiPage> =>
+    await apiGet (`/wiki/${ id }`, { params: version ? { version } : { } })
 
 
 export const fetchWikiPageByTitle = async (
     title:        string,
     { version }:  { version?: string },
-): Promise<WikiPage> =>
-    await apiGet (`/wiki/title/${ title }`, { params: version ? { version } : { } })
+): Promise<WikiPage | null> => {
+  try
+  {
+    return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })
+  }
+  catch
+  {
+    return null
+  }
+}

frontend/src/pages/posts/PostDetailPage.tsx

@@ -91,67 +91,65 @@ export default (({ user }: Props) => {
 		       : 'bg-gray-500 hover:bg-gray-600')
 
   return (
-      <>
-	<div className="md:flex md:flex-1">
-	  <Helmet>
-	    {(post?.thumbnail || post?.thumbnailBase) && (
-		<meta name="thumbnail" content={post.thumbnail || post.thumbnailBase}/>)}
-	    {post && <title>{`${ post.title || post.url } | ${ SITE_TITLE }`}</title>}
-	  </Helmet>
-
-	  <div className="hidden md:block">
-	    <TagDetailSidebar post={post ?? null}/>
-	  </div>
-
-	  <MainArea className="relative">
-	    {post
-	     ? (
-		<>
-		  {(post.thumbnail || post.thumbnailBase) && (
-		      <motion.div
-			  layoutId={`page-${ id }`}
-			  className="absolute top-4 left-4 w-[min(640px,calc(100vw-2rem))] h-[360px]
-				     overflow-hidden rounded-xl pointer-events-none z-50"
-			  initial={{ opacity: 1 }}
-			  animate={{ opacity: 0 }}
-			  transition={{ duration: .2, ease: 'easeOut' }}>
-			<img src={post.thumbnail || post.thumbnailBase}
-			     alt={post.title || post.url}
-			     title={post.title || post.url || undefined}
-			     className="object-cover w-full h-full"/>
-		      </motion.div>)}
-
-		  <PostEmbed post={post}/>
-		  <Button onClick={() => changeViewedFlg.mutate ()}
-			  disabled={changeViewedFlg.isPending}
-			  className={cn ('text-white', viewedClass)}>
-		    {post.viewed ? '閲覧済' : '未閲覧'}
-		  </Button>
-		  <TabGroup>
-		    <Tab name="関聯">
-		      {post.related.length > 0
-		       ? <PostList posts={post.related}/>
-		       : 'まだないよ（笑）'}
-		    </Tab>
-		    {['admin', 'member'].some (r => user?.role === r) && (
-			<Tab name="編輯">
-			  <PostEditForm
-			      post={post}
-			      onSave={newPost => {
-				qc.setQueryData (postsKeys.show (postId),
-						 (prev: any) => newPost ?? prev)
-				qc.invalidateQueries ({ queryKey: postsKeys.root })
-				toast ({ description: '更新しました．' })
-			      }}/>
-			</Tab>)}
-		  </TabGroup>
-		</>)
-	     : 'Loading...'}
-	  </MainArea>
-
-	  <div className="md:hidden">
-	    <TagDetailSidebar post={post ?? null}/>
-	  </div>
+      <div className="md:flex md:flex-1">
+	<Helmet>
+	  {(post?.thumbnail || post?.thumbnailBase) && (
+	      <meta name="thumbnail" content={post.thumbnail || post.thumbnailBase}/>)}
+	  {post && <title>{`${ post.title || post.url } | ${ SITE_TITLE }`}</title>}
+	</Helmet>
+
+	<div className="hidden md:block">
+	  <TagDetailSidebar post={post ?? null}/>
 	</div>
-      </>)
+
+	<MainArea className="relative">
+	  {post
+	   ? (
+	      <>
+		{(post.thumbnail || post.thumbnailBase) && (
+		    <motion.div
+			layoutId={`page-${ id }`}
+			className="absolute top-4 left-4 w-[min(640px,calc(100vw-2rem))] h-[360px]
+				   overflow-hidden rounded-xl pointer-events-none z-50"
+			initial={{ opacity: 1 }}
+			animate={{ opacity: 0 }}
+			transition={{ duration: .2, ease: 'easeOut' }}>
+		      <img src={post.thumbnail || post.thumbnailBase}
+			   alt={post.title || post.url}
+			   title={post.title || post.url || undefined}
+			   className="object-cover w-full h-full"/>
+		    </motion.div>)}
+
+		<PostEmbed post={post}/>
+		<Button onClick={() => changeViewedFlg.mutate ()}
+			disabled={changeViewedFlg.isPending}
+			className={cn ('text-white', viewedClass)}>
+		  {post.viewed ? '閲覧済' : '未閲覧'}
+		</Button>
+		<TabGroup>
+		  <Tab name="関聯">
+		    {post.related.length > 0
+		     ? <PostList posts={post.related}/>
+		     : 'まだないよ（笑）'}
+		  </Tab>
+		  {['admin', 'member'].some (r => user?.role === r) && (
+		      <Tab name="編輯">
+			<PostEditForm
+			    post={post}
+			    onSave={newPost => {
+			      qc.setQueryData (postsKeys.show (postId),
+					       (prev: any) => newPost ?? prev)
+			      qc.invalidateQueries ({ queryKey: postsKeys.root })
+			      toast ({ description: '更新しました．' })
+			    }}/>
+		      </Tab>)}
+		</TabGroup>
+	      </>)
+	   : 'Loading...'}
+	</MainArea>
+
+	<div className="md:hidden">
+	  <TagDetailSidebar post={post ?? null}/>
+	</div>
+      </div>)
 }) satisfies FC<Props>

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -1,24 +1,20 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
-import { useEffect, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
 import { Helmet } from 'react-helmet-async'
-import { Link, useLocation } from 'react-router-dom'
+import { useLocation } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
+import PrefetchLink from '@/components/PrefetchLink'
 import PageTitle from '@/components/common/PageTitle'
 import Pagination from '@/components/common/Pagination'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { fetchPostChanges } from '@/lib/posts'
+import { postsKeys } from '@/lib/queryKeys'
 
 import type { FC } from 'react'
 
-import type { PostTagChange } from '@/types'
-
 
 export default (() => {
-  const [changes, setChanges] = useState<PostTagChange[]> ([])
-  const [totalPages, setTotalPages] = useState<number> (0)
-
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const id = query.get ('id')
@@ -28,17 +24,11 @@ export default (() => {
   // 投稿列の結合で使用
   let rowsCnt: number
 
-  useEffect (() => {
-    void (async () => {
-      const res = await axios.get (`${ API_BASE_URL }/posts/changes`,
-				   { params: { ...(id && { id }), page, limit } })
-      const data = toCamel (res.data as any, { deep: true }) as {
-	  changes:  PostTagChange[]
-	  count:    number }
-      setChanges (data.changes)
-      setTotalPages (Math.ceil (data.count / limit))
-    }) ()
-  }, [id, page, limit])
+  const { data, isLoading: loading } = useQuery ({
+      queryKey: postsKeys.changes ({ ...(id && { id }), page, limit }),
+      queryFn:  () => fetchPostChanges ({ ...(id && { id }), page, limit }) })
+  const changes = data?.changes ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
 
   return (
       <MainArea>
@@ -48,57 +38,60 @@ export default (() => {
 
 	<PageTitle>
 	  耕作履歴
-	  {id && <>: 投稿 {<Link to={`/posts/${ id }`}>#{id}</Link>}</>}
+	  {id && <>: 投稿 {<PrefetchLink to={`/posts/${ id }`}>#{id}</PrefetchLink>}</>}
 	</PageTitle>
 
-	<table className="table-auto w-full border-collapse">
-	  <thead>
-	    <tr>
-	      <th className="p-2 text-left">投稿</th>
-	      <th className="p-2 text-left">変更</th>
-	      <th className="p-2 text-left">日時</th>
-	    </tr>
-	  </thead>
-	  <tbody>
-	    {changes.map ((change, i) => {
-	      let withPost = i === 0 || change.post.id !== changes[i - 1].post.id
-	      if (withPost)
-		{
-		  rowsCnt = 1
-		  for (let j = i + 1;
-		       (j < changes.length
-			&& change.post.id === changes[j].post.id);
-		       ++j)
-		    ++rowsCnt
-		}
-	      return (
-		  <tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag.id }`}>
-		    {withPost && (
-			<td className="align-top" rowSpan={rowsCnt}>
-			  <Link to={`/posts/${ change.post.id }`}>
-			    <img src={change.post.thumbnail || change.post.thumbnailBase || undefined}
-				 alt={change.post.title || change.post.url}
-				 title={change.post.title || change.post.url || undefined}
-				 className="w-40"/>
-			  </Link>
-			</td>)}
-		    <td>
-		      <TagLink tag={change.tag} withWiki={false} withCount={false}/>
-		      {`を${ change.changeType === 'add' ? '追加' : '削除' }`}
-		    </td>
-		    <td>
-		      {change.user ? (
-			  <Link to={`/users/${ change.user.id }`}>
-			    {change.user.name}
-			  </Link>) : 'bot 操作'}
-		      <br/>
-		      {change.timestamp}
-		    </td>
-		  </tr>)
-	    })}
-	  </tbody>
-	</table>
+	{loading ? 'Loading...' : (
+	    <>
+	      <table className="table-auto w-full border-collapse">
+		<thead>
+		  <tr>
+		    <th className="p-2 text-left">投稿</th>
+		    <th className="p-2 text-left">変更</th>
+		    <th className="p-2 text-left">日時</th>
+		  </tr>
+		</thead>
+		<tbody>
+		  {changes.map ((change, i) => {
+		    let withPost = i === 0 || change.post.id !== changes[i - 1].post.id
+		    if (withPost)
+		      {
+			rowsCnt = 1
+			for (let j = i + 1;
+			     (j < changes.length
+			      && change.post.id === changes[j].post.id);
+			     ++j)
+			  ++rowsCnt
+		      }
+		    return (
+			<tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag.id }`}>
+			  {withPost && (
+			      <td className="align-top" rowSpan={rowsCnt}>
+				<PrefetchLink to={`/posts/${ change.post.id }`}>
+				  <img src={change.post.thumbnail || change.post.thumbnailBase || undefined}
+				       alt={change.post.title || change.post.url}
+				       title={change.post.title || change.post.url || undefined}
+				       className="w-40"/>
+				</PrefetchLink>
+			      </td>)}
+			  <td>
+			    <TagLink tag={change.tag} withWiki={false} withCount={false}/>
+			    {`を${ change.changeType === 'add' ? '記載' : '消除' }`}
+			  </td>
+			  <td>
+			    {change.user ? (
+				<PrefetchLink to={`/users/${ change.user.id }`}>
+				  {change.user.name}
+				</PrefetchLink>) : 'bot 操作'}
+			    <br/>
+			    {change.timestamp}
+			  </td>
+			</tr>)
+		  })}
+		</tbody>
+	      </table>
 
-	<Pagination page={page} totalPages={totalPages}/>
+	      <Pagination page={page} totalPages={totalPages}/>
+	    </>)}
       </MainArea>)
 }) satisfies FC

frontend/src/pages/posts/PostNewPage.tsx

@@ -1,4 +1,3 @@
-import axios from 'axios'
 import { useEffect, useState, useRef } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useNavigate } from 'react-router-dom'
@@ -11,7 +10,8 @@ import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet, apiPost } from '@/lib/api'
 import Forbidden from '@/pages/Forbidden'
 
 import type { FC } from 'react'
@@ -55,9 +55,7 @@ export default (({ user }: Props) => {
 
     try
     {
-      await axios.post (`${ API_BASE_URL }/posts`, formData, { headers: {
-	  'Content-Type':     'multipart/form-data',
-	  'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
+      await apiPost ('/posts', formData, { headers: { 'Content-Type': 'multipart/form-data' } })
       toast ({ title: '投稿成功!' })
       navigate ('/posts')
     }
@@ -91,10 +89,7 @@ export default (({ user }: Props) => {
   const fetchTitle = async () => {
     setTitle ('')
     setTitleLoading (true)
-    const res = await axios.get (`${ API_BASE_URL }/preview/title`, {
-	params:   { url },
-	headers:  { 'X-Transfer-Code': localStorage.getItem ('user_code') || '' } })
-    const data = res.data as { title: string }
+    const data = await apiGet<{ title: string }> ('/preview/title', { params: { url } })
     setTitle (data.title || '')
     setTitleLoading (false)
   }
@@ -105,11 +100,8 @@ export default (({ user }: Props) => {
     setThumbnailLoading (true)
     if (thumbnailPreview)
       URL.revokeObjectURL (thumbnailPreview)
-    const res = await axios.get (`${ API_BASE_URL }/preview/thumbnail`, {
-	params:       { url },
-	headers:      { 'X-Transfer-Code': localStorage.getItem ('user_code') || '' },
-	responseType: 'blob' })
-    const data = res.data as Blob
+    const data = await apiGet<Blob> ('/preview/thumbnail',
+				     { params: { url }, responseType: 'blob' })
     const imageURL = URL.createObjectURL (data)
     setThumbnailPreview (imageURL)
     setThumbnailFile (new File ([data],

frontend/src/pages/tags/NicoTagListPage.tsx

@@ -1,5 +1,3 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
@@ -8,7 +6,8 @@ import SectionTitle from '@/components/common/SectionTitle'
 import TextArea from '@/components/common/TextArea'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet, apiPut } from '@/lib/api'
 
 import type { NicoTag, Tag, User } from '@/types'
 
@@ -29,10 +28,8 @@ export default ({ user }: Props) => {
   const loadMore = async (withCursor: boolean) => {
     setLoading (true)
 
-    const res = await axios.get (`${ API_BASE_URL }/tags/nico`, {
-	params: { ...(withCursor ? { cursor } : { }) } })
-    const data = toCamel (res.data as any, { deep: true }) as { tags:       NicoTag[]
-								nextCursor: string }
+    const data = await apiGet<{ tags: NicoTag[]; nextCursor: string }> (
+	'/tags/nico', { params: withCursor ? { cursor } : { } })
 
     setNicoTags (tags => [...(withCursor ? tags : []), ...data.tags])
     setCursor (data.nextCursor)
@@ -53,10 +50,8 @@ export default ({ user }: Props) => {
 	const formData = new FormData
 	formData.append ('tags', rawTags[id])
 
-	const res = await axios.put (`${ API_BASE_URL }/tags/nico/${ id }`, formData, { headers: {
-	    'Content-Type':     'multipart/form-data',
-	    'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
-	const data = toCamel (res.data as any, { deep: true }) as Tag[]
+	const data = await apiPut<Tag[]> (`/tags/nico/${ id }`, formData,
+				    { headers: { 'Content-Type': 'multipart/form-data' } })
 	setNicoTags (nicoTags => {
 	  nicoTags.find (t => t.id === id)!.linkedTags = data
 	  return [...nicoTags]

frontend/src/pages/users/SettingPage.tsx

@@ -1,4 +1,3 @@
-import axios from 'axios'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
@@ -10,7 +9,8 @@ import InheritDialogue from '@/components/users/InheritDialogue'
 import UserCodeDialogue from '@/components/users/UserCodeDialogue'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiPut } from '@/lib/api'
 
 import type { User } from '@/types'
 
@@ -32,10 +32,9 @@ export default ({ user, setUser }: Props) => {
 
     try
     {
-      const res = await axios.put (`${ API_BASE_URL }/users/${ user.id }`, formData, {
-	  headers: { 'Content-Type':     'multipart/form-data',
-		     'X-Transfer-Code':  localStorage.getItem ('user_code') || '' } })
-      const data = res.data as User
+      const data = await apiPut<User> (
+	  `/users/${ user.id }`, formData,
+	  { headers: { 'Content-Type': 'multipart/form-data' } })
       setUser (user => ({ ...user, ...data }))
       toast ({ title: '設定を更新しました．' })
     }

frontend/src/pages/wiki/WikiDetailPage.tsx

@@ -1,4 +1,5 @@
-import { useEffect, useState } from 'react'
+import { useQuery } from '@tanstack/react-query'
+import { useEffect, useMemo } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useNavigate, useParams } from 'react-router-dom'
 
@@ -12,10 +13,11 @@ import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
 import { fetchPosts } from '@/lib/posts'
+import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTagByName } from '@/lib/tags'
 import { fetchWikiPage, fetchWikiPageByTitle } from '@/lib/wiki'
 
-import type { Post, Tag, WikiPage } from '@/types'
+import type { Tag } from '@/types'
 
 
 export default () => {
@@ -25,76 +27,57 @@ export default () => {
   const location = useLocation ()
   const navigate = useNavigate ()
 
-  const defaultTag = { name: title, category: 'general' } as Tag
-
-  const [posts, setPosts] = useState<Post[]> ([])
-  const [tag, setTag] = useState (defaultTag)
-  const [wikiPage, setWikiPage] = useState<WikiPage | null | undefined> (undefined)
+  const defaultTag = useMemo (() => ({ name: title, category: 'general' } as Tag), [title])
 
   const query = new URLSearchParams (location.search)
-  const version = query.get ('version')
+  const version = query.get ('version') || undefined
+
+  const { data: wikiPage, isLoading: loading } = useQuery ({
+      enabled:  Boolean (title) && !(/^\d+$/.test (title)),
+      queryKey: wikiKeys.show (title, { version }),
+      queryFn:  () => fetchWikiPageByTitle (title, { version }) })
+
+  const effectiveTitle = wikiPage?.title ?? title
+
+  const { data: tag } = useQuery ({
+      enabled:  Boolean (effectiveTitle),
+      queryKey: tagsKeys.show (effectiveTitle),
+      queryFn:  () => fetchTagByName (effectiveTitle) })
+
+  const { data } = useQuery ({
+      enabled:  Boolean (effectiveTitle) && !(version),
+      queryKey: postsKeys.index ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }),
+      queryFn:  () => fetchPosts ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }) })
+  const posts = data?.posts || []
 
   useEffect (() => {
-    if (/^\d+$/.test (title))
-      {
-	void (async () => {
-	  setWikiPage (undefined)
-	  try
-	  {
-	    const data = await fetchWikiPage (title)
-	    navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
-	  }
-	  catch
-	  {
-	    ;
-	  }
-	}) ()
-
-	return
-      }
+    if (!(wikiPage))
+      return
 
-    void (async () => {
-      setWikiPage (undefined)
-      try
-      {
-	const data = await fetchWikiPageByTitle (title, version ? { version } : { })
-	if (data.title !== title)
-	  navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
-	setWikiPage (data)
-	WikiIdBus.set (data.id)
-      }
-      catch
-      {
-	setWikiPage (null)
-      }
-    }) ()
+    WikiIdBus.set (wikiPage.id)
 
-    setPosts ([])
-    void (async () => {
-      try
-      {
-	const data = await fetchPosts ({ tags: title, match: 'all', limit: 8 })
-	setPosts (data.posts)
-      }
-      catch
-      {
-	;
-      }
-    }) ()
+    if (wikiPage.title !== title)
+      navigate (`/wiki/${ encodeURIComponent(wikiPage.title) }`, { replace: true })
+
+    return () => WikiIdBus.set (null)
+  }, [wikiPage, title, navigate])
+
+  useEffect (() => {
+    if (!(/^\d+$/.test (title)))
+      return
 
     void (async () => {
       try
       {
-	setTag (await fetchTagByName (title))
+	const data = await fetchWikiPage (title, { })
+	navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
       }
       catch
       {
-	setTag (defaultTag)
+	;
       }
     }) ()
-
-    return () => WikiIdBus.set (null)
-  }, [title, location.search])
+  }, [title, navigate])
 
   return (
       <MainArea>
@@ -104,7 +87,8 @@ export default () => {
 	</Helmet>
 
 	{(wikiPage && version) && (
-	    <div className="text-sm flex gap-3 items-center justify-center border border-gray-700 rounded px-2 py-1 mb-4">
+	    <div className="text-sm flex gap-3 items-center justify-center
+			    border border-gray-700 rounded px-2 py-1 mb-4">
 	      {wikiPage.pred ? (
 		  <PrefetchLink to={`/wiki/${ encodeURIComponent (title) }?version=${ wikiPage.pred }`}>
 		    &lt; 古
@@ -119,15 +103,13 @@ export default () => {
 	    </div>)}
 
 	<PageTitle>
-	  <TagLink tag={tag}
+	  <TagLink tag={tag ?? defaultTag}
 		   withWiki={false}
 		   withCount={false}
 		   {...(version && { to: `/wiki/${ encodeURIComponent (title) }` })}/>
 	</PageTitle>
 	<div className="prose mx-auto p-4">
-	  {wikiPage === undefined
-	   ? 'Loading...'
-	   : <WikiBody title={title} body={wikiPage?.body}/>}
+	  {loading ? 'Loading...' : <WikiBody title={title} body={wikiPage?.body}/>}
 	</div>
 
 	{(!(version) && posts.length > 0) && (

frontend/src/pages/wiki/WikiDiffPage.tsx

@@ -1,12 +1,11 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation, useParams } from 'react-router-dom'
 
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet } from '@/lib/api'
 import { cn } from '@/lib/utils'
 
 import type { WikiPageDiff } from '@/types'
@@ -25,8 +24,7 @@ export default () => {
 
   useEffect (() => {
     void (async () => {
-      const res = await axios.get (`${ API_BASE_URL }/wiki/${ id }/diff`, { params: { from, to } })
-      setDiff (toCamel (res.data as any, { deep: true }) as WikiPageDiff)
+      setDiff (await apiGet<WikiPageDiff> (`/wiki/${ id }/diff`, { params: { from, to } }))
     }) ()
   }, [])
 

frontend/src/pages/wiki/WikiEditPage.tsx

@@ -1,4 +1,4 @@
-import axios from 'axios'
+import { useQueryClient } from '@tanstack/react-query'
 import MarkdownIt from 'markdown-it'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
@@ -7,7 +7,9 @@ import { useParams, useNavigate } from 'react-router-dom'
 
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet, apiPut } from '@/lib/api'
+import { wikiKeys } from '@/lib/queryKeys'
 import Forbidden from '@/pages/Forbidden'
 
 import 'react-markdown-editor-lite/lib/index.css'
@@ -29,6 +31,8 @@ export default (({ user }: Props) => {
 
   const navigate = useNavigate ()
 
+  const qc = useQueryClient ()
+
   const [body, setBody] = useState ('')
   const [loading, setLoading] = useState (true)
   const [title, setTitle] = useState ('')
@@ -40,9 +44,11 @@ export default (({ user }: Props) => {
 
     try
     {
-      await axios.put (`${ API_BASE_URL }/wiki/${ id }`, formData, { headers: {
-	  'Content-Type':     'multipart/form-data',
-	  'X-Transfer-Code':  localStorage.getItem ('user_code') ?? '' } })
+      await apiPut (`/wiki/${ id }`, formData,
+		    { headers: { 'Content-Type': 'multipart/form-data' } })
+      qc.setQueryData (wikiKeys.show (title, { }),
+		       (prev: WikiPage) => ({ ...prev, title, body }))
+      qc.invalidateQueries ({ queryKey: wikiKeys.root })
       toast ({ title: '投稿成功!' })
       navigate (`/wiki/${ title }`)
     }
@@ -55,8 +61,7 @@ export default (({ user }: Props) => {
   useEffect (() => {
     void (async () => {
       setLoading (true)
-      const res = await axios.get (`${ API_BASE_URL }/wiki/${ id }`)
-      const data = res.data as WikiPage
+      const data = await apiGet<WikiPage> (`/wiki/${ id }`)
       setTitle (data.title)
       setBody (data.body)
       setLoading (false)

frontend/src/pages/wiki/WikiHistoryPage.tsx

@@ -1,11 +1,11 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
 import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { Link, useLocation } from 'react-router-dom'
+import { useLocation } from 'react-router-dom'
 
+import PrefetchLink from '@/components/PrefetchLink'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet } from '@/lib/api'
 
 import type { WikiPageChange } from '@/types'
 
@@ -19,9 +19,7 @@ export default () => {
 
   useEffect (() => {
     void (async () => {
-      const res = await axios.get (`${ API_BASE_URL }/wiki/changes`,
-				   { params: { ...(id ? { id } : { }) } })
-      setChanges (toCamel (res.data as any, { deep: true }) as WikiPageChange[])
+      setChanges (await apiGet<WikiPageChange[]> ('/wiki/changes', { params: id ? { id } : { } }))
     }) ()
   }, [location.search])
 
@@ -44,22 +42,24 @@ export default () => {
 		<tr key={change.revisionId}>
 		  <td>
 		    {change.pred != null && (
-			<Link to={`/wiki/${ change.wikiPage.id }/diff?from=${ change.pred }&to=${ change.revisionId }`}>
+			<PrefetchLink
+			    to={`/wiki/${ change.wikiPage.id }/diff?from=${ change.pred }&to=${ change.revisionId }`}>
 			  差分
-			</Link>)}
+			</PrefetchLink>)}
 		  </td>
 		  <td className="p-2">
-		    <Link to={`/wiki/${ encodeURIComponent (change.wikiPage.title) }?version=${ change.revisionId }`}>
+		    <PrefetchLink
+			to={`/wiki/${ encodeURIComponent (change.wikiPage.title) }?version=${ change.revisionId }`}>
 		      {change.wikiPage.title}
-		    </Link>
+		    </PrefetchLink>
 		  </td>
 		  <td className="p-2">
 		    {change.pred == null ? '新規' : '更新'}
 		  </td>
 		  <td className="p-2">
-		    <Link to={`/users/${ change.user.id }`}>
+		    <PrefetchLink to={`/users/${ change.user.id }`}>
 		      {change.user.name}
-		    </Link>
+		    </PrefetchLink>
 		    <br/>
 		    {change.timestamp}
 		  </td>

frontend/src/pages/wiki/WikiNewPage.tsx

@@ -1,4 +1,3 @@
-import axios from 'axios'
 import MarkdownIt from 'markdown-it'
 import { useState } from 'react'
 import { Helmet } from 'react-helmet-async'
@@ -7,7 +6,8 @@ import { useLocation, useNavigate } from 'react-router-dom'
 
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiPost } from '@/lib/api'
 import Forbidden from '@/pages/Forbidden'
 
 import 'react-markdown-editor-lite/lib/index.css'
@@ -39,10 +39,8 @@ export default ({ user }: Props) => {
 
     try
     {
-      const res = await axios.post (`${ API_BASE_URL }/wiki`, formData, { headers: {
-	  'Content-Type':     'multipart/form-data',
-	  'X-Transfer-Code':  localStorage.getItem ('user_code') || '' } })
-      const data = res.data as WikiPage
+      const data = await apiPost<WikiPage> ('/wiki', formData,
+				  { headers: { 'Content-Type': 'multipart/form-data' } })
       toast ({ title: '投稿成功!' })
       navigate (`/wiki/${ data.title }`)
     }

frontend/src/pages/wiki/WikiSearchPage.tsx

@@ -1,12 +1,13 @@
-import axios from 'axios'
-import toCamel from 'camelcase-keys'
-import React, { useEffect, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { Link } from 'react-router-dom'
 
+import PrefetchLink from '@/components/PrefetchLink'
 import SectionTitle from '@/components/common/SectionTitle'
 import MainArea from '@/components/layout/MainArea'
-import { API_BASE_URL, SITE_TITLE } from '@/config'
+import { SITE_TITLE } from '@/config'
+import { apiGet } from '@/lib/api'
+
+import type { FormEvent } from 'react'
 
 import type { WikiPage } from '@/types'
 
@@ -17,11 +18,10 @@ export default () => {
   const [results, setResults] = useState<WikiPage[]> ([])
 
   const search = async () => {
-    const res = await axios.get (`${ API_BASE_URL }/wiki/search`, { params: { title } })
-    setResults (toCamel (res.data as any, { deep: true }) as WikiPage[])
+    setResults (await apiGet ('/wiki', { params: { title } }))
   }
 
-  const handleSearch = (ev: React.FormEvent) => {
+  const handleSearch = (ev: FormEvent) => {
     ev.preventDefault ()
     search ()
   }
@@ -78,9 +78,9 @@ export default () => {
 	      {results.map (page => (
 		  <tr key={page.id}>
 		    <td className="p-2">
-		      <Link to={`/wiki/${ encodeURIComponent (page.title) }`}>
+		      <PrefetchLink to={`/wiki/${ encodeURIComponent (page.title) }`}>
 			{page.title}
-		      </Link>
+		      </PrefetchLink>
 		    </td>
 		    <td className="p-2 text-gray-100 text-sm">
 		      {page.updatedAt}