#346

backend/app/controllers/application_controller.rb

@@ -1,7 +1,4 @@
 class ApplicationController < ActionController::API
-  rescue_from ActiveRecord::RecordInvalid, with: :render_record_invalid
-  rescue_from ActiveRecord::RecordNotUnique, with: :render_record_not_unique
-
   before_action :reject_banned_ip_address!
   before_action :authenticate_user
   before_action :reject_banned_user!
@@ -28,42 +25,6 @@ class ApplicationController < ActionController::API
     end
   end
 
-  def render_bad_request message = 'リクエストが不正です．', field: nil, code: :bad_request
-    render_error(:bad_request, message, field:, code:)
-  end
-
-  def render_unprocessable_entity message = '入力を確認してください．', field: nil, code: :invalid
-    render_error(:unprocessable_entity, message, field:, code:)
-  end
-
-  def render_error status, message, field: nil, code: status
-    error = { code: code.to_s, message: }
-    error[:field] = field.to_s if field.present?
-
-    render json: { errors: [error] }, status:
-  end
-
-  def render_model_errors record, status: :unprocessable_entity
-    errors =
-        record.errors.map do |error|
-          { code: error.type.to_s,
-            field: error.attribute.to_s,
-            message: error.full_message }
-        end
-
-    errors = [{ code: 'invalid', message: '入力を確認してください．' }] if errors.empty?
-
-    render json: { errors: }, status:
-  end
-
-  def render_record_invalid error
-    render_model_errors(error.record)
-  end
-
-  def render_record_not_unique _error = nil
-    render_unprocessable_entity('既に存在してゐます．', code: :taken)
-  end
-
   def reject_banned_ip_address!
     ip_address = IpAddress.find_by(ip_address: IPAddr.new(request.remote_ip).hton)
     return unless ip_address&.banned?
@@ -76,28 +37,4 @@ class ApplicationController < ActionController::API
 
     head :forbidden
   end
-
-  def render_validation_error record = nil, fields: { }, base: []
-    errors = { }
-
-    if record
-      record.errors.messages.each do |attr, messages|
-        errors[attr] ||= []
-        errors[attr].concat(messages)
-      end
-    end
-
-    fields.each do |attr, messages|
-      errors[attr] ||= []
-      errors[attr].concat(Array(messages))
-    end
-
-    base_errors = Array(base) - Array(errors.delete(:base))
-
-    render json: { type: 'validation_error',
-                   message: '入力内容を確認してください．',
-                   errors:,
-                   base_errors: },
-           status: :unprocessable_entity
-  end
 end

backend/app/controllers/deerjikists_controller.rb

@@ -2,8 +2,7 @@ class DeerjikistsController < ApplicationController
   def show
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
+    return head :bad_request if platform.blank? || code.blank?
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
 
     deerjikist = Deerjikist
                  .joins(:tag)
@@ -23,9 +22,7 @@ class DeerjikistsController < ApplicationController
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
     tag_id = params[:tag_id].to_i
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
+    return head :bad_request if platform.blank? || code.blank? || tag_id <= 0
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
-    return render_bad_request('tag_id が不正です．', field: :tag_id) if tag_id <= 0
 
     deerjikist = Deerjikist.find_or_initialize_by(platform:, code:).tap do |d|
       d.tag_id = tag_id
@@ -41,8 +38,7 @@ class DeerjikistsController < ApplicationController
 
     platform = params[:platform].to_s.strip
     code = params[:code].to_s.strip
-    return render_bad_request('platform は必須です．', field: :platform) if platform.blank?
+    return head :bad_request if platform.blank? || code.blank?
-    return render_bad_request('code は必須です．', field: :code) if code.blank?
 
     Deerjikist.find([platform, code]).destroy!
 

backend/app/controllers/materials_controller.rb

@@ -40,8 +40,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_bad_request('タグは必須です．', field: :tag) if tag_name_raw.blank?
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
-    return render_bad_request('ファイルまたは URL は必須です．') if file.blank? && url.blank?
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -55,7 +54,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url), status: :created
     else
-      render_model_errors(material)
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 
@@ -69,8 +68,7 @@ class MaterialsController < ApplicationController
     tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
     url = params[:url].to_s.strip.presence
-    return render_bad_request('タグは必須です．', field: :tag) if tag_name_raw.blank?
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
-    return render_bad_request('ファイルまたは URL は必須です．') if file.blank? && url.blank?
 
     tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
     tag = tag_name.tag
@@ -86,7 +84,7 @@ class MaterialsController < ApplicationController
     if material.save
       render json: MaterialRepr.base(material, host: request.base_url)
     else
-      render_model_errors(material)
+      render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end
   end
 

backend/app/controllers/nico_tags_controller.rb

@@ -30,14 +30,12 @@ class NicoTagsController < ApplicationController
     id = params[:id].to_i
 
     tag = Tag.find(id)
-    return render_bad_request('ニコニコ・タグを指定してください．', field: :id) unless tag.nico?
+    return head :bad_request unless tag.nico?
 
     linked_tag_names = params[:tags].to_s.split
     linked_tags = Tag.normalise_tags!(linked_tag_names, with_tagme: false,
                                                         with_no_deerjikist: false)
-    if linked_tags.any? { |t| t.nico? }
+    return head :bad_request if linked_tags.any? { |t| t.nico? }
-      return render_bad_request('ニコニコ・タグ同士は連携できません．', field: :tags)
-    end
 
     ApplicationRecord.transaction do
       TagVersioning.record_tag_snapshots!(linked_tags, created_by_user: current_user)

backend/app/controllers/posts_controller.rb

@@ -148,11 +148,11 @@ class PostsController < ApplicationController
     post.reload
     render json: PostRepr.base(post), status: :created
   rescue Tag::NicoTagNormalisationError
-    render_bad_request('ニコニコ・タグは直接指定できません．', field: :tags)
+    head :bad_request
   rescue ArgumentError => e
-    render_unprocessable_entity(e.message)
+    render json: { errors: [e.message] }, status: :unprocessable_entity
   rescue ActiveRecord::RecordInvalid => e
-    render_model_errors(e.record)
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
   end
 
   def viewed
@@ -175,10 +175,10 @@ class PostsController < ApplicationController
 
     force = bool?(:force)
     merge = bool?(:merge)
-    return render_bad_request('force と merge は同時に指定できません．') if force && merge
+    return head :bad_request if force && merge
 
     base_version_no = parse_base_version_no
-    return render_bad_request('base_version_no は必須です．', field: :base_version_no) if !(force) && !(base_version_no)
+    return head :bad_request if !(force) && !(base_version_no)
 
     title = params[:title].presence
     tag_names = params[:tags].to_s.split
@@ -238,11 +238,11 @@ class PostsController < ApplicationController
     json['tags'] = build_tag_tree_for(post.tags)
     render json:, status: :ok
   rescue Tag::NicoTagNormalisationError
-    render_bad_request('ニコニコ・タグは直接指定できません．', field: :tags)
+    head :bad_request
   rescue ArgumentError => e
-    render_validation_error(fields: { parent_post_ids: [e.message] })
+    render json: { errors: [e.message] }, status: :unprocessable_entity
   rescue ActiveRecord::RecordInvalid => e
-    render_validation_error(e.record)
+    render json: { errors: e.record.errors.full_messages }, status: :unprocessable_entity
   end
 
   def changes
@@ -416,7 +416,7 @@ class PostsController < ApplicationController
 
   def sync_parent_posts! post, parent_post_ids
     if parent_post_ids.include?(post.id)
-      post.errors.add(:parent_post_ids, '自分自身を親投稿にはできません．')
+      post.errors.add(:base, '自分自身を親投稿にはできません．')
       raise ActiveRecord::RecordInvalid, post
     end
 

backend/app/controllers/preview_controller.rb

@@ -4,7 +4,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．', field: :url) unless url.present?
+    return head :bad_request unless url.present?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -16,7 +16,7 @@ class PreviewController < ApplicationController
 
     render json: { title: title }
   rescue => e
-    render_bad_request(e.message, field: :url)
+    render json: { error: e.message }, status: :bad_request
   end
 
   def thumbnail
@@ -25,7 +25,7 @@ class PreviewController < ApplicationController
     return head :unauthorized unless current_user
 
     url = params[:url]
-    return render_bad_request('URL は必須です．', field: :url) if url.blank?
+    return head :bad_request if url.blank?
 
     unless url.start_with?(/http(s)?:\/\//)
       url = 'http://' + url
@@ -40,8 +40,7 @@ class PreviewController < ApplicationController
       File.delete(path) rescue nil
       send_file image.path, type: 'image/png', disposition: 'inline'
     else
-      render_error(:internal_server_error, 'サムネールを生成できませんでした．',
+      render json: { error: 'Failed to generate thumbnail' }, status: :internal_server_error
-                   code: :thumbnail_generation_failed)
     end
   end
 end

backend/app/controllers/tag_children_controller.rb

@@ -5,12 +5,11 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．', field: :parent_id) if parent_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
-    return render_bad_request('child_id は必須です．', field: :child_id) if child_id.blank?
 
     parent = Tag.find(parent_id)
     child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?
 
     ApplicationRecord.transaction do
       TagVersioning.ensure_snapshot!(child, created_by_user: current_user)
@@ -28,12 +27,11 @@ class TagChildrenController < ApplicationController
 
     parent_id = params[:parent_id]
     child_id = params[:child_id]
-    return render_bad_request('parent_id は必須です．', field: :parent_id) if parent_id.blank?
+    return head :bad_request if parent_id.blank? || child_id.blank?
-    return render_bad_request('child_id は必須です．', field: :child_id) if child_id.blank?
 
     parent = Tag.find(parent_id)
     child = Tag.find(child_id)
-    return render_bad_request('ニコニコ・タグの階層は変更できません．') if parent.nico? || child.nico?
+    return head :bad_request if parent.nico? || child.nico?
 
     ApplicationRecord.transaction do
       TagVersioning.ensure_snapshot!(child, created_by_user: current_user)

backend/app/controllers/tags_controller.rb

@@ -168,7 +168,7 @@ class TagsController < ApplicationController
 
   def show_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -192,7 +192,7 @@ class TagsController < ApplicationController
 
   def deerjikists_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, tag_name: :wiki_page)
@@ -228,7 +228,7 @@ class TagsController < ApplicationController
 
   def materials_by_name
     name = params[:name].to_s.strip
-    return render_bad_request('name は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     tag = Tag.joins(:tag_name)
              .includes(:tag_name, :materials, tag_name: :wiki_page)
@@ -247,16 +247,17 @@ class TagsController < ApplicationController
 
     name = params[:name].to_s.strip
     category = params[:category].to_s.strip
-    return render_unprocessable_entity('名前は必須です．', field: :name) if name.blank?
+    return head :unprocessable_entity if name.blank? || category.blank?
-    return render_unprocessable_entity('カテゴリは必須です．', field: :category) if category.blank?
 
     if name != tag.name &&
         tag.in?([Tag.tagme, Tag.bot, Tag.no_deerjikist, Tag.video, Tag.niconico])
-      return render_unprocessable_entity('システム・タグの名称は変更できません．', field: :name)
+      return render json: { error: 'システム・タグの名称は変更できません．' },
+                    status: :unprocessable_entity
     end
 
     if tag.nico? || category == 'nico'
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      return render json: { error: 'ニコタグは変更できません．' },
+                    status: :unprocessable_entity
     end
 
     alias_names = params[:aliases].to_s.split.uniq
@@ -301,7 +302,8 @@ class TagsController < ApplicationController
     tag = Tag.find(params[:id])
 
     if tag.nico? || (category.present? && category == 'nico')
-      return render_unprocessable_entity('ニコタグは変更できません．', field: :category)
+      return render json: { error: 'ニコタグは変更できません．' },
+                    status: :unprocessable_entity
     end
 
     ApplicationRecord.transaction do

backend/app/controllers/theatre_comments_controller.rb

@@ -15,7 +15,7 @@ class TheatreCommentsController < ApplicationController
     return head :unauthorized unless current_user
 
     content = params[:content]
-    return render_unprocessable_entity('本文は必須です．', field: :content) if content.blank?
+    return head :unprocessable_entity if content.blank?
 
     theatre = Theatre.find_by(id: params[:theatre_id])
     return head :not_found unless theatre

backend/app/controllers/users_controller.rb

@@ -42,12 +42,12 @@ class UsersController < ApplicationController
     return head :unauthorized if user&.id != params[:id].to_i
 
     name = params[:name]
-    return render_bad_request('名前は必須です．', field: :name) if name.blank?
+    return head :bad_request if name.blank?
 
     if user.update(name:)
       render json: user.slice(:id, :name, :inheritance_code, :role), status: :ok
     else
-      render_model_errors(user)
+      render json: user.errors, status: :unprocessable_entity
     end
   end
 

backend/app/controllers/wiki_pages_controller.rb

@@ -46,7 +46,7 @@ class WikiPagesController < ApplicationController
 
   def diff
     id = params[:id]
-    return render_bad_request('id は必須です．', field: :id) if id.blank?
+    return head :bad_request if id.blank?
 
     from = params[:from].presence
     to = params[:to].presence
@@ -56,7 +56,7 @@ class WikiPagesController < ApplicationController
     from_rev = from && page.wiki_revisions.find(from)
     to_rev = to ? page.wiki_revisions.find(to) : page.current_revision
     if ((from_rev && !(from_rev.content?)) || !(to_rev&.content?))
-      return render_unprocessable_entity('差分を表示できない版です．')
+      return head :unprocessable_entity
     end
 
     diffs = Diff::LCS.sdiff(from_rev&.body&.lines || [], to_rev.body.lines)
@@ -89,8 +89,7 @@ class WikiPagesController < ApplicationController
     body = params[:body].to_s
     message = params[:message].presence
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
 
     tag_name = TagName.find_undiscard_or_create_by!(name: title)
 
@@ -102,10 +101,8 @@ class WikiPagesController < ApplicationController
             message:)
 
     render json: WikiPageRepr.base(page), status: :created
-  rescue ActiveRecord::RecordInvalid => e
+  rescue ActiveRecord::RecordInvalid, ActiveRecord::RecordNotUnique
-    render_model_errors(e.record)
+    head :unprocessable_entity
-  rescue ActiveRecord::RecordNotUnique
-    render_record_not_unique
   end
 
   def update
@@ -115,8 +112,7 @@ class WikiPagesController < ApplicationController
     title = params[:title]&.strip
     body = params[:body].to_s
 
-    return render_unprocessable_entity('タイトルは必須です．', field: :title) if title.blank?
+    return head :unprocessable_entity if title.blank? || body.blank?
-    return render_unprocessable_entity('本文は必須です．', field: :body) if body.blank?
 
     page = WikiPage.find(params[:id])
     base_revision_id = params[:base_revision_id].presence

backend/spec/requests/error_responses_spec.rb

@@ -1,47 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe 'error responses', type: :request do
-  describe 'manual input errors' do
-    it 'returns a stable errors array for bad requests' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: '   ' }
-
-      expect(response).to have_http_status(:bad_request)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'bad_request',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-
-    it 'returns a stable errors array for unprocessable requests' do
-      member = create(:user, :member)
-      tag = create(:tag, :general, name: 'error_response_tag')
-      sign_in_as(member)
-
-      patch "/tags/#{ tag.id }", params: { category: 'nico' }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to contain_exactly(
-          include('code' => 'invalid',
-                  'field' => 'category',
-                  'message' => be_present))
-    end
-  end
-
-  describe 'model validation errors' do
-    it 'returns field, code, and message for model errors' do
-      user = create(:user)
-      sign_in_as(user)
-
-      put "/users/#{ user.id }", params: { name: 'a' * 256 }
-
-      expect(response).to have_http_status(:unprocessable_entity)
-      expect(json.fetch('errors')).to include(
-          include('code' => 'too_long',
-                  'field' => 'name',
-                  'message' => be_present))
-    end
-  end
-end

docs/commands.md

@@ -18,13 +18,12 @@ npm install
 npm run dev
 npm run build
 npm run lint
-npm run test
+npm test
-npm run test:run
 ```
 
 ### Full verification
 
 ```sh
 cd backend && bundle exec rspec
-cd ../frontend && npm run test:run && npm run build && npm run lint
+cd ../frontend && npm run build && npm run lint
 ```

frontend/eslint.config.js

@@ -5,7 +5,7 @@ import reactRefresh from 'eslint-plugin-react-refresh'
 import tseslint from 'typescript-eslint'
 
 export default tseslint.config(
-  { ignores: ['dist', 'tailwind.config.js'] },
+  { ignores: ['dist'] },
   {
     extends: [js.configs.recommended, ...tseslint.configs.recommended],
     files: ['**/*.{ts,tsx}'],

frontend/package.json

@@ -8,8 +8,6 @@
     "build": "tsc -b && vite build",
     "postbuild": "node scripts/generate-sitemap.js",
     "lint": "eslint .",
-    "test": "vitest",
-    "test:run": "vitest run",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -47,10 +45,6 @@
   "devDependencies": {
     "@eslint/js": "^9.25.0",
     "@tailwindcss/typography": "^0.5.19",
-    "@testing-library/dom": "^10.4.1",
-    "@testing-library/jest-dom": "^6.9.1",
-    "@testing-library/react": "^16.3.2",
-    "@testing-library/user-event": "^14.6.1",
     "@types/axios": "^0.14.4",
     "@types/markdown-it": "^14.1.2",
     "@types/mdx": "^2.0.13",
@@ -64,13 +58,11 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.19",
     "globals": "^16.0.0",
-    "jsdom": "^26.1.0",
     "postcss": "^8.5.3",
     "tailwindcss": "^3.4.13",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.30.1",
-    "vite": "^6.3.5",
+    "vite": "^6.3.5"
-    "vitest": "^4.1.5"
   },
   "description": "This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.",
   "main": "eslint.config.js",

frontend/src/App.tsx

@@ -93,7 +93,7 @@ const PostDetailRoute = ({ user }: { user: User | null }) => {
 }
 
 
-const App: FC = () => {
+export default (() => {
   const [user, setUser] = useState<User | null> (null)
   const [status, setStatus] = useState (200)
 
@@ -156,6 +156,4 @@ const App: FC = () => {
 	  </DialogueProvider>
 	</BrowserRouter>
       </>)
-}
+}) satisfies FC
-
-export default App

frontend/src/components/DraggableDroppableTagRow.tsx

@@ -19,7 +19,7 @@ type Props = {
     sp?:              boolean }
 
 
-const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }) => {
+export default (({ tag, nestLevel, pathKey, parentTagId, suppressClickRef, sp }: Props) => {
   const dndId = `tag-node:${ pathKey }`
 
   const downPosRef = useRef<{ x: number; y: number } | null> (null)
@@ -96,6 +96,4 @@ const DraggableDroppableTagRow: FC<Props> = ({ tag, nestLevel, pathKey, parentTa
 	  <TagLink tag={tag} nestLevel={nestLevel}/>
 	</motion.div>
       </div>)
-}
+}) satisfies FC<Props>
-
-export default DraggableDroppableTagRow

frontend/src/components/ErrorScreen.test.tsx

@@ -1,32 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { HelmetProvider } from 'react-helmet-async'
-import { describe, expect, it } from 'vitest'
-
-import ErrorScreen from '@/components/ErrorScreen'
-
-describe ('ErrorScreen', () => {
-  it.each ([
-    [403, '権限ないよ（笑）'],
-    [404, 'ページないよ（笑）'],
-    [500, '鯖でエラー出たって（嘲笑）'],
-    [503, '鯖死んでるよ（泣）'],
-  ]) ('renders status %s', (status, message) => {
-    render (
-        <HelmetProvider>
-          <ErrorScreen status={status}/>
-        </HelmetProvider>,
-    )
-
-    expect (screen.getByText (String (status))).toBeInTheDocument ()
-    expect (screen.getByText (message)).toBeInTheDocument ()
-    expect (screen.getByAltText ('逃げたギター')).toBeInTheDocument ()
-  })
-
-  it ('throws for unsupported statuses', () => {
-    expect (() => render (
-        <HelmetProvider>
-          <ErrorScreen status={418}/>
-        </HelmetProvider>,
-    )).toThrow ()
-  })
-})

frontend/src/components/ErrorScreen.tsx

@@ -10,7 +10,7 @@ import type { FC } from 'react'
 type Props = { status: number }
 
 
-const ErrorScreen: FC<Props> = ({ status }) => {
+export default (({ status }: Props) => {
   const [message, rightMsg, leftMsg]: [string, string, string] = (() => {
     switch (status)
     {
@@ -58,6 +58,4 @@ const ErrorScreen: FC<Props> = ({ status }) => {
 	  <p className="mr-[-.5em]">{message}</p>
 	</div>
       </MainArea>)
-}
+}) satisfies FC<Props>
-
-export default ErrorScreen

frontend/src/components/MaterialSidebar.tsx

@@ -31,7 +31,7 @@ const setChildrenById = (
     }))
 
 
-const MaterialSidebar: FC = () => {
+export default (() => {
   const [tags, setTags] = useState<TagWithDepth[]> ([])
   const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
   const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
@@ -94,6 +94,4 @@ const MaterialSidebar: FC = () => {
 	  {renderTags (tags)}
 	</ul>
       </SidebarComponent>)
-}
+}) satisfies FC
-
-export default MaterialSidebar

frontend/src/components/MenuSeparator.tsx

@@ -1,11 +1,9 @@
 import type { FC } from 'react'
 
 
-const MenuSeparator: FC = () => (
+export default (() => (
     <>
       <span className="hidden md:inline flex items-center px-2">|</span>
       <hr className="block md:hidden w-full opacity-25
 		     border-t border-black dark:border-white"/>
-    </>)
+    </>)) satisfies FC
-
-export default MenuSeparator

frontend/src/components/PostEditForm.test.tsx

@@ -1,69 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostEditForm from '@/components/PostEditForm'
-import { buildPost, buildTag } from '@/test/factories'
-
-const postsApi = vi.hoisted (() => ({
-  updatePost: vi.fn (),
-}))
-
-const api = vi.hoisted (() => ({
-  isApiError: vi.fn (() => false),
-}))
-
-const toastApi = vi.hoisted (() => ({
-  toast: vi.fn (),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/components/ui/use-toast', () => toastApi)
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => ({
-    choice: vi.fn (),
-  }),
-}))
-
-describe ('PostEditForm', () => {
-  it ('submits edited post fields with the current base version', async () => {
-    const onSave = vi.fn ()
-    const post = buildPost ({
-      id:        8,
-      versionNo: 4,
-      title:     'old',
-      tags:      [
-        buildTag ({ name: 'general-tag', category: 'general' }),
-        buildTag ({ id: 2, name: 'nico-tag', category: 'nico' }),
-      ],
-      parentPosts: [buildPost ({ id: 2, title: 'parent' })],
-    })
-    postsApi.updatePost.mockResolvedValueOnce ({
-      ...post,
-      versionNo: 5,
-      title:     'new',
-      tags:      [buildTag ({ name: 'new-tag' })],
-    })
-
-    render (<PostEditForm post={post} onSave={onSave}/>)
-
-    const [title, parentIds] = screen.getAllByRole ('textbox')
-    fireEvent.change (title, { target: { value: 'new' } })
-    fireEvent.change (parentIds, { target: { value: '3 4' } })
-    fireEvent.submit (screen.getByRole ('button', { name: '更新' }).closest ('form')!)
-
-    await waitFor (() => {
-      expect (postsApi.updatePost).toHaveBeenCalledWith (
-          expect.objectContaining ({
-            id:            8,
-            title:         'new',
-            parentPostIds: '3 4',
-            tags:          'general-tag',
-          }),
-          { baseVersionNo: 4 },
-      )
-    })
-    expect (onSave).toHaveBeenCalledWith (expect.objectContaining ({ versionNo: 5 }))
-    expect (toastApi.toast).toHaveBeenCalledWith ({ description: '更新しました．' })
-  })
-})

frontend/src/components/PostEditForm.tsx

@@ -2,23 +2,16 @@ import { useEffect, useState } from 'react'
 
 import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
-import FieldError from '@/components/common/FieldError'
 import Label from '@/components/common/Label'
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
-import { isApiError } from '@/lib/api'
-import { extractValidationError } from '@/lib/apiErrors'
 import { updatePost } from '@/lib/posts'
 
 import type { FC, FormEvent } from 'react'
 
-import type { FieldErrors } from '@/lib/apiErrors'
 import type { Post, Tag } from '@/types'
 
-type PostFormField =
-    'parentPostId' | 'tags' | 'originalCreatedFrom' | 'originalCreatedBefore'
-
 
 const tagsToStr = (tags: Tag[]): string => {
   const result: Tag[] = []
@@ -39,10 +32,8 @@ type Props = { post:    Post
 	       onSave:  (newPost: Post) => void }
 
 
-const PostEditForm: FC<Props> = ({ post, onSave }) => {
+export default (({ post, onSave }: Props) => {
-  const [baseErrors, setBaseErrors] = useState<string[]> ([])
   const [disabled, setDisabled] = useState (false)
-  const [fieldErrors, setFieldErrors] = useState<FieldErrors> ({ })
   const [originalCreatedBefore, setOriginalCreatedBefore] =
       useState<string | null> (post.originalCreatedBefore)
   const [originalCreatedFrom, setOriginalCreatedFrom] =
@@ -55,9 +46,6 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
   const dialogue = useDialogue ()
 
   const update = async (...args: Parameters<typeof updatePost>) => {
-    setFieldErrors ({ })
-    setBaseErrors ([])
-
     try
     {
       const data = await updatePost (...args)
@@ -74,25 +62,14 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
     }
     catch (e)
     {
-      const response = isApiError<{ mergeable?: boolean }> (e) ? e.response : undefined
+      const response = (e as any)?.response
 
       if (response?.status !== 409)
 	{
-	  const validationError = extractValidationError (e)
-
-	  if (validationError)
-	    {
-	      setFieldErrors (validationError.fieldErrors)
-	      setBaseErrors (validationError.baseErrors)
 	  toast ({ description: '更新はできなかったよ……' })
 	  return
 	}
 
-	  toast ({ title: '失敗……', description: '入力を確認してください．' })
-
-	  return
-	}
-
       const action = await dialogue.choice ({
 	  title: '競合が発生しました．',
 	  description: (
@@ -164,15 +141,13 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	      value={parentPostIds}
 	      onChange={e => setParentPostIds (e.target.value)}
 	      className="w-full border p-2 rounded"/>
-	  <FieldError messages={fieldErrors.url}/>
 	</div>
 
 	{/* タグ */}
 	<PostFormTagsArea
 	    disabled={disabled}
 	    tags={tags}
-	    setTags={setTags}
+	    setTags={setTags}/>
-	    errors={fieldErrors.tags}/>
 
 	{/* オリジナルの作成日時 */}
 	<PostOriginalCreatedTimeField
@@ -180,9 +155,7 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    originalCreatedFrom={originalCreatedFrom}
 	    setOriginalCreatedFrom={setOriginalCreatedFrom}
 	    originalCreatedBefore={originalCreatedBefore}
-	    setOriginalCreatedBefore={setOriginalCreatedBefore}
+	    setOriginalCreatedBefore={setOriginalCreatedBefore}/>
-	    fromErrors={fieldErrors.originalCreatedFrom}
-	    beforeErrors={fieldErrors.originalCreatedBefore}/>
 
 	{/* 送信 */}
 	<Button
@@ -191,6 +164,4 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	  更新
 	</Button>
       </form>)
-}
+}) satisfies FC<Props>
-
-export default PostEditForm

frontend/src/components/PostEmbed.test.tsx

@@ -1,63 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PostEmbed from '@/components/PostEmbed'
-import { buildPost } from '@/test/factories'
-
-const dialogue = vi.hoisted (() => ({
-  confirm: vi.fn (),
-}))
-
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => dialogue,
-}))
-
-vi.mock ('@/components/NicoViewer', () => ({
-  default: ({ id }: { id: string }) => <div>Nico:{id}</div>,
-}))
-
-vi.mock ('react-youtube', () => ({
-  default: ({ videoId }: { videoId: string }) => <div>YouTube:{videoId}</div>,
-}))
-
-describe ('PostEmbed', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('embeds nicovideo watch URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://www.nicovideo.jp/watch/sm12345' })}/>)
-
-    expect (screen.getByText ('Nico:sm12345')).toBeInTheDocument ()
-  })
-
-  it ('embeds x/twitter status URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://x.com/someone/status/12345' })}/>)
-
-    expect (screen.getByRole ('link', { name: '@someone' })).toBeInTheDocument ()
-  })
-
-  it ('embeds youtube watch URLs', () => {
-    render (<PostEmbed post={buildPost ({ url: 'https://www.youtube.com/watch?v=abc123' })}/>)
-
-    expect (screen.getByText ('YouTube:abc123')).toBeInTheDocument ()
-  })
-
-  it ('asks before framing unknown external pages', async () => {
-    dialogue.confirm.mockResolvedValueOnce (true)
-    render (
-        <PostEmbed
-            post={buildPost ({ url: 'https://example.com/page', title: 'external' })}/>,
-    )
-
-    fireEvent.click (screen.getByRole ('link', { name: '外部ページを表示' }))
-
-    await waitFor (() => {
-      expect (dialogue.confirm).toHaveBeenCalled ()
-    })
-    expect (await screen.findByTitle ('external')).toHaveAttribute (
-        'src',
-        'https://example.com/page',
-    )
-  })
-})

frontend/src/components/PostEmbed.tsx

@@ -16,9 +16,8 @@ type Props = {
     onMetadataChange?:  (meta: NiconicoMetadata) => void }
 
 
-const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) => {
+export default (({ ref, post, onLoadComplete, onMetadataChange }: Props) => {
   const dialogue = useDialogue ()
-  const [framed, setFramed] = useState (false)
 
   const url = new URL (post.url)
 
@@ -45,7 +44,7 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
   case 'twitter.com':
   case 'x.com':
     {
-      const mUserId = url.pathname.match (/(?<=\/)[^/]+?(?=\/|$|\?)/)
+      const mUserId = url.pathname.match (/(?<=\/)[^\/]+?(?=\/|$|\?)/)
       const mStatusId = url.pathname.match (/(?<=\/status\/)\d+?(?=\/|$|\?)/)
       if (!(mUserId) || !(mStatusId))
 	break
@@ -73,6 +72,8 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
     }
   }
 
+  const [framed, setFramed] = useState (false)
+
   return (
       <>
 	{framed
@@ -100,6 +101,4 @@ const PostEmbed: FC<Props> = ({ ref, post, onLoadComplete, onMetadataChange }) =
 	      </a>
 	    </div>)}
       </>)
-}
+}) satisfies FC<Props>
-
-export default PostEmbed

frontend/src/components/PostFormTagsArea.test.tsx

@@ -1,34 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostFormTagsArea from '@/components/PostFormTagsArea'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('PostFormTagsArea', () => {
-  it ('updates text and fetches autocomplete for the selected token', async () => {
-    const setTags = vi.fn ()
-    api.apiGet.mockResolvedValueOnce ([buildTag ({ name: '虹夏', postCount: 3 })])
-
-    renderWithProviders (<PostFormTagsArea tags="虹" setTags={setTags}/>)
-
-    const textarea = screen.getByRole ('textbox')
-    fireEvent.focus (textarea)
-    fireEvent.select (textarea, { target: { selectionStart: 1, selectionEnd: 1 } })
-    fireEvent.change (textarea, { target: { value: '虹夏' } })
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/autocomplete',
-          { params: { q: '虹', nico: '0' } },
-      )
-    })
-    expect (setTags).toHaveBeenCalledWith ('虹夏')
-  })
-})

frontend/src/components/PostFormTagsArea.tsx

@@ -3,7 +3,6 @@
 import { useRef, useState } from 'react'
 
 import TagSearchBox from '@/components/TagSearchBox'
-import FieldError from '@/components/common/FieldError'
 import Label from '@/components/common/Label'
 import TextArea from '@/components/common/TextArea'
 import { apiGet } from '@/lib/api'
@@ -34,11 +33,10 @@ const replaceToken = (value: string, start: number, end: number, text: string) =
 
 type Props = Omit<ComponentPropsWithoutRef<'textarea'>, 'value' | 'onChange' | 'onBlur'> & {
     tags:     string
-    setTags:  (tags: string) => void
+    setTags:  (tags: string) => void }
-    errors?:  string[] }
 
 
-const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
+export default (({ tags, setTags, ...rest }: Props) => {
   const ref = useRef<HTMLTextAreaElement> (null)
 
   const [bounds, setBounds] = useState<{ start: number; end: number }> ({ start: 0, end: 0 })
@@ -98,8 +96,5 @@ const PostFormTagsArea: FC<Props> = ({ tags, setTags, errors, ...rest }) => {
 			     : [] as Tag[]}
 		activeIndex={-1}
 		onSelect={handleTagSelect}/>)}
-	<FieldError messages={errors}/>
       </div>)
-}
+}) satisfies FC<Props>
-
-export default PostFormTagsArea

frontend/src/components/PostList.test.tsx

@@ -1,44 +0,0 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PostList from '@/components/PostList'
-import { buildPost } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const prefetchers = vi.hoisted (() => ({
-  prefetchForURL: vi.fn (),
-}))
-
-vi.mock ('@/lib/prefetchers', () => prefetchers)
-
-describe ('PostList', () => {
-  beforeEach (() => {
-    prefetchers.prefetchForURL.mockResolvedValue (undefined)
-  })
-
-  it ('renders post thumbnails as links to post details', () => {
-    renderWithProviders (
-        <PostList posts={[
-          buildPost ({ id: 1, title: 'First', thumbnail: 'first.jpg' }),
-          buildPost ({ id: 2, title: null, url: 'https://example.com/second' }),
-        ]}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: 'First' })).toHaveAttribute (
-        'href',
-        '/posts/1',
-    )
-    expect (
-        screen.getByRole ('link', { name: 'https://example.com/second' }),
-    ).toHaveAttribute ('href', '/posts/2')
-  })
-
-  it ('calls the optional click handler', () => {
-    const onClick = vi.fn ()
-    renderWithProviders (<PostList posts={[buildPost ()]} onClick={onClick}/>)
-
-    fireEvent.click (screen.getByRole ('link', { name: 'テスト投稿' }))
-
-    expect (onClick).toHaveBeenCalledTimes (1)
-  })
-})

frontend/src/components/PostList.tsx

@@ -14,7 +14,7 @@ type Props = { posts:     Post[]
 	       onClick?:  (event: MouseEvent<HTMLElement>) => void }
 
 
-const PostList: FC<Props> = ({ posts, onClick }) => {
+export default (({ posts, onClick }: Props) => {
   const location = useLocation ()
 
   const setForLocationKey = useSharedTransitionStore (s => s.setForLocationKey)
@@ -70,6 +70,4 @@ const PostList: FC<Props> = ({ posts, onClick }) => {
 	      </PrefetchLink>)
 	})}
       </div>)
-}
+}) satisfies FC<Props>
-
-export default PostList

frontend/src/components/PostOriginalCreatedTimeField.test.tsx

@@ -1,63 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
-
-describe ('PostOriginalCreatedTimeField', () => {
-  it ('updates from and before values', () => {
-    const setFrom = vi.fn ()
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom={null}
-            setOriginalCreatedFrom={setFrom}
-            originalCreatedBefore={null}
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const inputs = screen.getAllByDisplayValue ('')
-    fireEvent.change (inputs[0], { target: { value: '2026-01-02T03:04' } })
-    fireEvent.change (inputs[1], { target: { value: '2026-01-03T03:04' } })
-
-    expect (setFrom).toHaveBeenCalledWith (expect.any (String))
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
-  })
-
-  it ('infers an exclusive before value on blur', () => {
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom={null}
-            setOriginalCreatedFrom={vi.fn ()}
-            originalCreatedBefore={null}
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const input = screen.getAllByDisplayValue ('')[0]
-    fireEvent.blur (input, { target: { value: '2026-01-02T03:04' } })
-
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
-  })
-
-  it ('resets both values', () => {
-    const setFrom = vi.fn ()
-    const setBefore = vi.fn ()
-
-    render (
-        <PostOriginalCreatedTimeField
-            originalCreatedFrom="2026-01-01T00:00:00Z"
-            setOriginalCreatedFrom={setFrom}
-            originalCreatedBefore="2026-01-02T00:00:00Z"
-            setOriginalCreatedBefore={setBefore}/>,
-    )
-
-    const buttons = screen.getAllByRole ('button', { name: 'リセット' })
-    fireEvent.click (buttons[0])
-    fireEvent.click (buttons[1])
-
-    expect (setFrom).toHaveBeenCalledWith (null)
-    expect (setBefore).toHaveBeenCalledWith (null)
-  })
-})

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -9,19 +9,16 @@ type Props = {
     originalCreatedFrom:      string | null
     setOriginalCreatedFrom:   (x: string | null) => void
     originalCreatedBefore:    string | null
-    setOriginalCreatedBefore: (x: string | null) => void
+    setOriginalCreatedBefore: (x: string | null) => void }
-    fromErrors?:              string[]
-    beforeErrors?:            string[] }
 
 
-const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
+export default (({ disabled,
 		   originalCreatedFrom,
 		   setOriginalCreatedFrom,
 		   originalCreatedBefore,
-		   setOriginalCreatedBefore }) => (
+		   setOriginalCreatedBefore }: Props) => (
     <div>
       <Label>オリジナルの作成日時</Label>
-
       <div className="my-1 flex">
 	<div className="w-80">
 	  <DateTimeField
@@ -54,8 +51,6 @@ const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
 	  </Button>
 	</div>
       </div>
-      <FieldError messages={fromErrors}/>
-
       <div className="my-1 flex">
 	<div className="w-80">
 	  <DateTimeField
@@ -76,7 +71,4 @@ const PostOriginalCreatedTimeField: FC<Props> = ({ disabled,
 	  </Button>
 	</div>
       </div>
-      <FieldError messages={beforeErrors}/>
+    </div>)) satisfies FC<Props>
-    </div>)
-
-export default PostOriginalCreatedTimeField

frontend/src/components/RouteBlockerOverlay.test.tsx

@@ -1,30 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { afterEach, describe, expect, it } from 'vitest'
-
-import RouteBlockerOverlay, { useOverlayStore } from '@/components/RouteBlockerOverlay'
-
-describe ('RouteBlockerOverlay', () => {
-  afterEach (() => {
-    useOverlayStore.setState ({ active: false })
-    document.body.style.overflow = ''
-    document.body.removeAttribute ('aria-busy')
-  })
-
-  it ('renders nothing while inactive', () => {
-    useOverlayStore.setState ({ active: false })
-
-    const { container } = render (<RouteBlockerOverlay/>)
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-
-  it ('renders a blocking progressbar and marks the body busy while active', () => {
-    useOverlayStore.setState ({ active: true })
-
-    render (<RouteBlockerOverlay/>)
-
-    expect (screen.getByRole ('progressbar', { name: 'Loading' })).toBeInTheDocument ()
-    expect (document.body).toHaveAttribute ('aria-busy', 'true')
-    expect (document.body.style.overflow).toBe ('hidden')
-  })
-})

frontend/src/components/RouteBlockerOverlay.tsx

@@ -13,7 +13,7 @@ export const useOverlayStore = create<OverlayStore> (set => ({
     setActive:  v => set ({ active: v }) }))
 
 
-const RouteBlockerOverlay: FC = () => {
+export default (() => {
   const active = useOverlayStore (s => s.active)
 
   useEffect (() => {
@@ -43,6 +43,4 @@ const RouteBlockerOverlay: FC = () => {
 	  </div>
 	</div>
       </div>)
-}
+}) satisfies FC
-
-export default RouteBlockerOverlay

frontend/src/components/SortHeader.test.tsx

@@ -1,39 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import SortHeader from '@/components/SortHeader'
-import { renderWithProviders } from '@/test/render'
-
-describe ('SortHeader', () => {
-  it ('toggles the active sort direction and resets the page', () => {
-    renderWithProviders (
-        <SortHeader
-            by="title"
-            label="タイトル"
-            currentOrder="title:asc"
-            defaultDirection={{ title: 'asc' }}/>,
-        { route: '/posts?tags=x&page=4&order=title%3Aasc' },
-    )
-
-    expect (screen.getByRole ('link', { name: 'タイトル ▲' })).toHaveAttribute (
-        'href',
-        '/posts?tags=x&page=1&order=title%3Adesc',
-    )
-  })
-
-  it ('uses default direction for inactive fields', () => {
-    renderWithProviders (
-        <SortHeader
-            by="updated_at"
-            label="更新"
-            currentOrder="title:desc"
-            defaultDirection={{ title: 'asc', updated_at: 'desc' }}/>,
-        { route: '/posts?page=2' },
-    )
-
-    expect (screen.getByRole ('link', { name: '更新' })).toHaveAttribute (
-        'href',
-        '/posts?page=1&order=updated_at%3Adesc',
-    )
-  })
-})

frontend/src/components/TagDetailSidebar.tsx

@@ -151,7 +151,7 @@ const DropSlot = ({ cat }: { cat: Category }) => {
 type Props = { post: Post; sp?: boolean }
 
 
-const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
+export default (({ post, sp }: Props) => {
   sp = Boolean (sp)
 
   const qc = useQueryClient ()
@@ -376,6 +376,4 @@ const TagDetailSidebar: FC<Props> = ({ post, sp }) => {
 	  </DragOverlay>
 	</DndContext>
       </SidebarComponent>)
-}
+}) satisfies FC<Props>
-
-export default TagDetailSidebar

frontend/src/components/TagLink.test.tsx

@@ -1,45 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TagLink from '@/components/TagLink'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TagLink', () => {
-  it ('links tag names to post search and shows counts', () => {
-    renderWithProviders (
-        <TagLink tag={buildTag ({ name: '虹 夏', postCount: 4 })}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: '虹 夏' })).toHaveAttribute (
-        'href',
-        '/posts?tags=%E8%99%B9+%E5%A4%8F',
-    )
-    expect (screen.getByText ('4')).toBeInTheDocument ()
-  })
-
-  it ('links wiki markers to the correct detail route', () => {
-    renderWithProviders (
-        <TagLink tag={buildTag ({ hasWiki: true, name: 'a/b' })}/>,
-    )
-
-    expect (screen.getByRole ('link', { name: '?' })).toHaveAttribute (
-        'href',
-        '/wiki/a%2Fb',
-    )
-  })
-
-  it ('renders aliases and non-link tags when requested', () => {
-    renderWithProviders (
-        <TagLink
-            tag={buildTag ({ matchedAlias: '別名', name: '正式名' })}
-            linkFlg={false}
-            withWiki={false}
-            withCount={false}/>,
-    )
-
-    expect (screen.getByText ('別名')).toBeInTheDocument ()
-    expect (screen.getByText ('正式名')).toBeInTheDocument ()
-    expect (screen.queryByRole ('link')).not.toBeInTheDocument ()
-  })
-})

frontend/src/components/TagLink.tsx

@@ -27,12 +27,12 @@ type Props =
     | PropsWithoutLink
 
 
-const TagLink: FC<Props> = ({ tag,
+export default (({ tag,
 		   nestLevel = 0,
 		   linkFlg   = true,
 		   withWiki  = true,
 		   withCount = true,
-		   ...props }) => {
+		   ...props }: Props) => {
   const spanClass = cn (
       `text-${ TAG_COLOUR[tag.category] }-${ LIGHT_COLOUR_SHADE }`,
       `dark:text-${ TAG_COLOUR[tag.category] }-${ DARK_COLOUR_SHADE }`)
@@ -126,6 +126,4 @@ const TagLink: FC<Props> = ({ tag,
 	{withCount && (
 	    <span className="ml-1">{tag.postCount}</span>)}
       </>)
-}
+}) satisfies FC<Props>
-
-export default TagLink

frontend/src/components/TagSearch.tsx

@@ -12,7 +12,7 @@ import type { ChangeEvent, FC, KeyboardEvent } from 'react'
 import type { Tag } from '@/types'
 
 
-const TagSearch: FC = () => {
+export default (() => {
   const location = useLocation ()
   const navigate = useNavigate ()
 
@@ -115,6 +115,4 @@ const TagSearch: FC = () => {
 		      activeIndex={activeIndex}
 		      onSelect={handleTagSelect}/>
       </div>)
-}
+}) satisfies FC
-
-export default TagSearch

frontend/src/components/TagSearchBox.test.tsx

@@ -1,30 +0,0 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import TagSearchBox from '@/components/TagSearchBox'
-import { buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TagSearchBox', () => {
-  it ('renders suggestions and selects tags on mouse down', () => {
-    const handleSelect = vi.fn ()
-    const tag = buildTag ({ id: 9, name: '候補', postCount: 2 })
-
-    renderWithProviders (
-        <TagSearchBox suggestions={[tag]} activeIndex={0} onSelect={handleSelect}/>,
-    )
-
-    fireEvent.mouseDown (screen.getByText ('候補'))
-
-    expect (handleSelect).toHaveBeenCalledWith (tag)
-    expect (screen.getByText ('2')).toBeInTheDocument ()
-  })
-
-  it ('renders nothing when suggestions are empty', () => {
-    const { container } = renderWithProviders (
-        <TagSearchBox suggestions={[]} activeIndex={-1} onSelect={vi.fn ()}/>,
-    )
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-})

frontend/src/components/TagSearchBox.tsx

@@ -10,7 +10,7 @@ type Props = { suggestions: Tag[]
 	       onSelect:    (tag: Tag) => void }
 
 
-const TagSearchBox: FC<Props> = ({ suggestions, activeIndex, onSelect }) => {
+export default (({ suggestions, activeIndex, onSelect }: Props) => {
   if (suggestions.length === 0)
     return
 
@@ -26,6 +26,4 @@ const TagSearchBox: FC<Props> = ({ suggestions, activeIndex, onSelect }) => {
 	      <TagLink tag={tag} linkFlg={false} withWiki={false}/>
 	    </li>))}
       </ul>)
-}
+}) satisfies FC<Props>
-
-export default TagSearchBox

frontend/src/components/TagSidebar.tsx

@@ -19,7 +19,7 @@ type Props = { posts:     Post[]
 	       onClick?:  (event: MouseEvent<HTMLElement>) => void }
 
 
-const TagSidebar: FC<Props> = ({ posts, onClick }) => {
+export default (({ posts, onClick }: Props) => {
   const navigate = useNavigate ()
 
   const [tagsVsbl, setTagsVsbl] = useState (false)
@@ -126,6 +126,4 @@ const TagSidebar: FC<Props> = ({ posts, onClick }) => {
 	  {tagsVsbl ? '▲▲▲ タグ一覧を閉じる ▲▲▲' : '▼▼▼ タグ一覧を表示 ▼▼▼'}
 	</a>
       </SidebarComponent>)
-}
+}) satisfies FC<Props>
-
-export default TagSidebar

frontend/src/components/TopNav.tsx

@@ -26,7 +26,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
     pathName: string }): Menu => {
   const postCount = tag?.postCount ?? 0
 
-  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^/]+/.test (pathName) && wikiId)
+  const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (pathName) && wikiId)
   const wikiTitle = pathName.split ('/')[2] ?? ''
 
   const tagFlg = /^\/tags\/\d+/.test (pathName)
@@ -80,7 +80,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 }
 
 
-const TopNav: FC<Props> = ({ user }) => {
+export default (({ user }: Props) => {
   const location = useLocation ()
 
   const dirRef = useRef<(-1) | 1> (1)
@@ -159,12 +159,12 @@ const TopNav: FC<Props> = ({ user }) => {
   useEffect (() => {
     const unsubscribe = WikiIdBus.subscribe (setWikiId)
     return () => unsubscribe ()
-  }, [])
+  }, [activeIdx])
 
   useEffect (() => {
     setMenuOpen (false)
     setOpenItemIdx (activeIdx)
-  }, [activeIdx, location])
+  }, [location])
 
   return (
       <>
@@ -433,6 +433,4 @@ const TopNav: FC<Props> = ({ user }) => {
 	      </motion.div>)}
 	</AnimatePresence>
       </>)
-}
+}) satisfies FC<Props>
-
-export default TopNav

frontend/src/components/TopNavUser.test.tsx

@@ -1,29 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TopNavUser from '@/components/TopNavUser'
-import { buildUser } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-describe ('TopNavUser', () => {
-  it ('renders nothing without a user', () => {
-    const { container } = renderWithProviders (<TopNavUser user={null}/>)
-
-    expect (container).toBeEmptyDOMElement ()
-  })
-
-  it ('links named users to settings', () => {
-    renderWithProviders (<TopNavUser user={buildUser ({ name: '山田' })}/>)
-
-    expect (screen.getByRole ('link', { name: '山田' })).toHaveAttribute (
-        'href',
-        '/users/settings',
-    )
-  })
-
-  it ('uses the anonymous display name', () => {
-    renderWithProviders (<TopNavUser user={buildUser ({ name: null })}/>)
-
-    expect (screen.getByRole ('link', { name: '名もなきニジラー' })).toBeInTheDocument ()
-  })
-})

frontend/src/components/TopNavUser.tsx

@@ -10,7 +10,7 @@ type Props = { user:  User | null,
 	       sp?:   boolean }
 
 
-const TopNavUser: FC<Props> = ({ user, sp }) => {
+export default (({ user, sp }: Props) => {
   if (!(user))
     return
 
@@ -28,6 +28,4 @@ const TopNavUser: FC<Props> = ({ user, sp }) => {
 	  {user.name || '名もなきニジラー'}
 	</PrefetchLink>
       </>)
-}
+}) satisfies FC<Props>
-
-export default TopNavUser

frontend/src/components/TwitterEmbed.test.tsx

@@ -1,19 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TwitterEmbed from '@/components/TwitterEmbed'
-
-describe ('TwitterEmbed', () => {
-  it ('renders tweet and user links', () => {
-    render (<TwitterEmbed userId="user_name" statusId="12345"/>)
-
-    expect (screen.getByRole ('link', { name: '@user_name' })).toHaveAttribute (
-        'href',
-        'https://twitter.com/user_name?ref_src=twsrc%3Etfw',
-    )
-    expect (screen.getByRole ('link', { name: /\d/ })).toHaveAttribute (
-        'href',
-        'https://twitter.com/user_name/status/12345?ref_src=twsrc%5Etfw',
-    )
-  })
-})

frontend/src/components/TwitterEmbed.tsx

@@ -5,7 +5,7 @@ type Props = {
     statusId: string }
 
 
-const TwitterEmbed: FC<Props> = ({ userId, statusId }) => {
+export default (({ userId, statusId }: Props) => {
   const now = (new Date).toLocaleDateString ()
 
   return (
@@ -18,6 +18,4 @@ const TwitterEmbed: FC<Props> = ({ userId, statusId }) => {
 	</blockquote>
 	<script async src="https://platform.twitter.com/widgets.js" charSet="utf-8"/>
       </div>)
-}
+}) satisfies FC<Props>
-
-export default TwitterEmbed

frontend/src/components/WikiBody.tsx

@@ -25,7 +25,7 @@ const mdComponents = { a: (({ href, children }) => (
 				  </a>))) } as const satisfies Components
 
 
-const WikiBody: FC<Props> = ({ title, body }) => {
+export default (({ title, body }: Props) => {
   const { data } = useQuery ({
       enabled: Boolean (body),
       queryKey: wikiKeys.index ({ }),
@@ -39,6 +39,4 @@ const WikiBody: FC<Props> = ({ title, body }) => {
       <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) })。`}
       </ReactMarkdown>)
-}
+}) satisfies FC<Props>
-
-export default WikiBody

frontend/src/components/common/DateTimeField.test.tsx

@@ -1,27 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import DateTimeField from '@/components/common/DateTimeField'
-
-describe ('DateTimeField', () => {
-  it ('renders an ISO value as a datetime-local value', () => {
-    render (<DateTimeField aria-label="日時" value="2026-01-02T03:04:05.000Z"/>)
-
-    const input = screen.getByLabelText ('日時')
-
-    expect (input).toHaveValue ('2026-01-02T12:04')
-  })
-
-  it ('reports local changes as ISO strings and empty values as null', () => {
-    const handleChange = vi.fn ()
-    render (<DateTimeField aria-label="日時" onChange={handleChange}/>)
-
-    const input = screen.getByLabelText ('日時')
-    fireEvent.change (input, { target: { value: '2026-01-02T03:04' } })
-    fireEvent.change (input, { target: { value: '' } })
-
-    const first = handleChange.mock.calls[0]?.[0]
-    expect (new Date (first).getFullYear ()).toBe (2026)
-    expect (handleChange).toHaveBeenLastCalledWith (null)
-  })
-})

frontend/src/components/common/DateTimeField.tsx

@@ -25,7 +25,7 @@ type Props = Omit<ComponentPropsWithoutRef<'input'>, 'onChange'> & {
     onBlur?:    (ev: FocusEvent<HTMLInputElement>) => void }
 
 
-const DateTimeField: FC<Props> = ({ value, onChange, className, onBlur, ...rest }) => {
+export default (({ value, onChange, className, onBlur, ...rest }: Props) => {
   const [local, setLocal] = useState ('')
 
   useEffect (() => {
@@ -44,6 +44,4 @@ const DateTimeField: FC<Props> = ({ value, onChange, className, onBlur, ...rest
 	    onChange?.(v ? (new Date (v)).toISOString () : null)
 	  }}
 	  onBlur={onBlur}/>)
-}
+}) satisfies FC<Props>
-
-export default DateTimeField

frontend/src/components/common/FieldError.tsx

@@ -1,17 +0,0 @@
-import type { FC } from 'react'
-
-type Props = { messages?: string[] }
-
-
-export const FieldError: FC<Props> = ({ messages }: Props) => {
-  if (!(messages?.length))
-    return null
-
-  return (
-      <ul className="mt-1 space-y-1 text-red-600 dark:text-red-400">
-	{messages.map ((message, i) => <li key={i}>{message}</li>)}
-      </ul>)
-}
-
-
-export default FieldError

frontend/src/components/common/Form.tsx

@@ -3,9 +3,7 @@ import type { FC, ReactNode } from 'react'
 type Props = { children: ReactNode }
 
 
-const Form: FC<Props> = ({ children }) => (
+export default (({ children }: Props) => (
     <div className="max-w-xl mx-auto p-4 space-y-4">
       {children}
-    </div>)
+    </div>)) satisfies FC<Props>
-
-export default Form

frontend/src/components/common/Label.test.tsx

@@ -1,26 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import Label from '@/components/common/Label'
-
-describe ('Label', () => {
-  it ('renders a plain label', () => {
-    render (<Label>名前</Label>)
-
-    expect (screen.getByText ('名前')).toBeInTheDocument ()
-  })
-
-  it ('renders and toggles the optional checkbox', () => {
-    const handleChange = vi.fn ()
-
-    render (
-        <Label checkBox={{ label: '不明', checked: false, onChange: handleChange }}>
-          日時
-        </Label>,
-    )
-
-    fireEvent.click (screen.getByRole ('checkbox', { name: '不明' }))
-
-    expect (handleChange).toHaveBeenCalledTimes (1)
-  })
-})

frontend/src/components/common/Label.tsx

@@ -1,14 +1,12 @@
 import React from 'react'
 
-import type { FC } from 'react'
-
 type Props = { children:  React.ReactNode
                checkBox?: { label:    string
                             checked:  boolean
                             onChange: (event: React.ChangeEvent<HTMLInputElement>) => void } }
 
 
-const Label: FC<Props> = ({ children, checkBox }) => {
+export default ({ children, checkBox }: Props) => {
   if (!(checkBox))
     {
       return (
@@ -28,5 +26,3 @@ const Label: FC<Props> = ({ children, checkBox }) => {
         </label>
       </div>)
 }
-
-export default Label

frontend/src/components/common/PageTitle.test.tsx

@@ -1,15 +0,0 @@
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import PageTitle from '@/components/common/PageTitle'
-
-
-describe ('PageTitle', () => {
-  it ('renders children as a level 1 heading', () => {
-    render (<PageTitle>Test title</PageTitle>)
-
-    const heading = screen.getByRole ('heading', { level: 1 })
-
-    expect (heading.textContent).toBe ('Test title')
-  })
-})

frontend/src/components/common/PageTitle.tsx

@@ -1,13 +1,9 @@
 import React from 'react'
 
-import type { FC } from 'react'
-
 type Props = { children: React.ReactNode }
 
 
-const PageTitle: FC<Props> = ({ children }) => (
+export default ({ children }: Props) => (
     <h1 className="text-2xl font-bold mb-2">
       {children}
     </h1>)
-
-export default PageTitle

frontend/src/components/common/Pagination.test.tsx

@@ -1,38 +0,0 @@
-import { screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import Pagination from '@/components/common/Pagination'
-import { renderWithProviders } from '@/test/render'
-
-describe ('Pagination', () => {
-  it ('builds page links while preserving existing query parameters', () => {
-    renderWithProviders (
-        <Pagination page={3} totalPages={5} siblingCount={1}/>,
-        { route: '/posts?tags=abc&page=3' },
-    )
-
-    expect (screen.getByLabelText ('前のページ')).toHaveAttribute (
-        'href',
-        '/posts?tags=abc&page=2',
-    )
-    expect (screen.getByLabelText ('次のページ')).toHaveAttribute (
-        'href',
-        '/posts?tags=abc&page=4',
-    )
-    expect (screen.getByText ('3')).toHaveAttribute ('aria-current', 'page')
-  })
-
-  it ('does not render active previous and next controls at the edges', () => {
-    const { rerender } = renderWithProviders (
-        <Pagination page={1} totalPages={1}/>,
-        { route: '/tags' },
-    )
-
-    expect (screen.queryByLabelText ('前のページ')).not.toBeInTheDocument ()
-    expect (screen.queryByLabelText ('次のページ')).not.toBeInTheDocument ()
-
-    rerender (<Pagination page={1} totalPages={2}/>)
-
-    expect (screen.getByLabelText ('次のページ')).toHaveAttribute ('href', '/tags?page=2')
-  })
-})

frontend/src/components/common/Pagination.tsx

@@ -48,7 +48,7 @@ const getPages = (
 }
 
 
-const Pagination: FC<Props> = ({ page, totalPages, siblingCount = 3 }) => {
+export default (({ page, totalPages, siblingCount = 3 }) => {
   const location = useLocation ()
 
   const buildTo = (p: number) => {
@@ -124,6 +124,4 @@ const Pagination: FC<Props> = ({ page, totalPages, siblingCount = 3 }) => {
 	      </>)}
 	</div>
       </nav>)
-}
+}) satisfies FC<Props>
-
-export default Pagination

frontend/src/components/common/SectionTitle.tsx

@@ -5,9 +5,7 @@ import type { ComponentPropsWithoutRef, FC } from 'react'
 type Props = ComponentPropsWithoutRef<'h2'>
 
 
-const SectionTitle: FC<Props> = ({ children, className, ...rest }) => (
+export default (({ children, className, ...rest }: Props) => (
     <h2 {...rest} className={cn ('text-xl my-4', className)}>
       {children}
-    </h2>)
+    </h2>)) satisfies FC<Props>
-
-export default SectionTitle

frontend/src/components/common/SubsectionTitle.tsx

@@ -1,13 +1,9 @@
 import React from 'react'
 
-import type { FC } from 'react'
-
 type Props = { children: React.ReactNode }
 
 
-const SubsectionTitle: FC<Props> = ({ children }) => (
+export default ({ children }: Props) => (
     <h3 className="my-2">
       {children}
     </h3>)
-
-export default SubsectionTitle

frontend/src/components/common/TabGroup.test.tsx

@@ -1,23 +0,0 @@
-import { fireEvent, render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import TabGroup, { Tab } from '@/components/common/TabGroup'
-
-describe ('TabGroup', () => {
-  it ('uses the init tab and switches tabs when clicked', () => {
-    render (
-        <TabGroup>
-          <Tab name="A">Alpha</Tab>
-          <Tab name="B" init>Beta</Tab>
-        </TabGroup>,
-    )
-
-    expect (screen.queryByText ('Alpha')).not.toBeInTheDocument ()
-    expect (screen.getByText ('Beta')).toBeInTheDocument ()
-
-    fireEvent.click (screen.getByText ('A'))
-
-    expect (screen.getByText ('Alpha')).toBeInTheDocument ()
-    expect (screen.queryByText ('Beta')).not.toBeInTheDocument ()
-  })
-})

frontend/src/components/common/TabGroup.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import React, { useState } from 'react'
 import { cn } from '@/lib/utils'
 
@@ -12,7 +10,7 @@ type Props = { children: React.ReactNode }
 export const Tab = ({ children }: TabProps) => <>{children}</>
 
 
-const TabGroup: FC<Props> = ({ children }) => {
+export default ({ children }: Props) => {
   const tabs = React.Children.toArray (children) as React.ReactElement<TabProps>[]
 
   const [current, setCurrent] = useState<number> (() => {
@@ -39,5 +37,3 @@ const TabGroup: FC<Props> = ({ children }) => {
 	</div>
       </div>)
 }
-
-export default TabGroup

frontend/src/components/common/TagInput.test.tsx

@@ -1,44 +0,0 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import TagInput from '@/components/common/TagInput'
-import { buildTag } from '@/test/factories'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('TagInput', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('updates value and fetches autocomplete for the last token', async () => {
-    const setValue = vi.fn ()
-    api.apiGet.mockResolvedValueOnce ([buildTag ({ name: '虹夏', postCount: 2 })])
-
-    render (<TagInput value="ぼっち 虹" setValue={setValue}/>)
-
-    fireEvent.change (screen.getByRole ('textbox'), { target: { value: 'ぼっち 虹夏' } })
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/autocomplete',
-          { params: { q: '虹夏' } },
-      )
-    })
-    expect (setValue).toHaveBeenCalledWith ('ぼっち 虹夏')
-  })
-
-  it ('does not fetch when the last token is blank', () => {
-    const setValue = vi.fn ()
-    render (<TagInput value="" setValue={setValue}/>)
-
-    fireEvent.change (screen.getByRole ('textbox'), { target: { value: ' ' } })
-
-    expect (api.apiGet).not.toHaveBeenCalled ()
-    expect (setValue).toHaveBeenCalledWith (' ')
-  })
-})

frontend/src/components/common/TagInput.tsx

@@ -12,7 +12,7 @@ type Props = {
     value:      string
     setValue:   (value: string) => void }
 
-const TagInput: FC<Props> = ({ value, setValue }) => {
+export default (({ value, setValue }: Props) => {
   const [activeIndex, setActiveIndex] = useState (-1)
   const [suggestions, setSuggestions] = useState<Tag[]> ([])
   const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
@@ -62,12 +62,9 @@ const TagInput: FC<Props> = ({ value, setValue }) => {
     case 'Enter':
       if (activeIndex < 0)
 	break
-      {
       ev.preventDefault ()
       const selected = suggestions[activeIndex]
-	if (selected)
+      selected && handleTagSelect (selected)
-	  handleTagSelect (selected)
-      }
       break
 
     case 'Escape':
@@ -97,6 +94,4 @@ const TagInput: FC<Props> = ({ value, setValue }) => {
 	    activeIndex={activeIndex}
 	    onSelect={handleTagSelect}/>
       </div>)
-}
+}) satisfies FC<Props>
-
-export default TagInput

frontend/src/components/common/TypographyAndForm.test.tsx

@@ -1,37 +0,0 @@
-import { createRef } from 'react'
-import { render, screen } from '@testing-library/react'
-import { describe, expect, it } from 'vitest'
-
-import Form from '@/components/common/Form'
-import SectionTitle from '@/components/common/SectionTitle'
-import SubsectionTitle from '@/components/common/SubsectionTitle'
-import TextArea from '@/components/common/TextArea'
-
-describe ('common typography and form components', () => {
-  it ('renders Form children inside the standard container', () => {
-    render (<Form><span>Content</span></Form>)
-
-    expect (screen.getByText ('Content')).toBeInTheDocument ()
-  })
-
-  it ('renders SectionTitle as an h2', () => {
-    render (<SectionTitle>Section</SectionTitle>)
-
-    expect (screen.getByRole ('heading', { level: 2, name: 'Section' })).toBeInTheDocument ()
-  })
-
-  it ('renders SubsectionTitle as an h3', () => {
-    render (<SubsectionTitle>Subsection</SubsectionTitle>)
-
-    expect (screen.getByRole ('heading', { level: 3, name: 'Subsection' })).toBeInTheDocument ()
-  })
-
-  it ('forwards refs and props to TextArea', () => {
-    const ref = createRef<HTMLTextAreaElement> ()
-
-    render (<TextArea ref={ref} aria-label="Body" defaultValue="text"/>)
-
-    expect (ref.current).toBe (screen.getByLabelText ('Body'))
-    expect (screen.getByLabelText ('Body')).toHaveValue ('text')
-  })
-})

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -57,7 +57,7 @@ let nextDialogueId = 1
 type Props = { children: ReactNode }
 
 
-const DialogueProvider: FC<Props> = ({ children }) => {
+export default (({ children }: Props) => {
   const [queue, setQueue] = useState<DialogueRequest[]> ([])
 
   const push = useCallback ((request: Omit<DialogueRequest, 'id'>) => {
@@ -174,7 +174,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 	      </DialogContent>)}
 	</Dialog>
       </DialogueContext.Provider>)
-}
+}) satisfies FC<Props>
 
 
 export const useDialogue = () => {
@@ -185,5 +185,3 @@ export const useDialogue = () => {
 
   return dialogue
 }
-
-export default DialogueProvider

frontend/src/components/layout/MainArea.tsx

@@ -9,12 +9,10 @@ type Props = {
     className?: string }
 
 
-const MainArea: FC<Props> = ({ children, className }) => (
+export default (({ children, className }: Props) => (
     <motion.main
 	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
 	className={cn ('flex-1 overflow-y-auto p-4', className)}
 	layout="position">
       {children}
-    </motion.main>)
+    </motion.main>)) satisfies FC<Props>
-
-export default MainArea

frontend/src/components/layout/SidebarComponent.tsx

@@ -6,7 +6,7 @@ import type { FC, ReactNode } from 'react'
 type Props = { children: ReactNode }
 
 
-const SidebarComponent: FC<Props> = ({ children }) => (
+export default (({ children }: Props) => (
     <motion.div
 	layout="position"
 	transition={{ layout: { duration: .2, ease: 'easeOut' } }}
@@ -27,6 +27,4 @@ const SidebarComponent: FC<Props> = ({ children }) => (
       </Helmet>
 
       {children}
-    </motion.div>)
+    </motion.div>)) satisfies FC<Props>
-
-export default SidebarComponent

frontend/src/components/ui/use-toast.tsx

@@ -18,6 +18,13 @@ type ToasterToast = ToastProps & {
   action?: ToastActionElement
 }
 
+const actionTypes = {
+  ADD_TOAST: "ADD_TOAST",
+  UPDATE_TOAST: "UPDATE_TOAST",
+  DISMISS_TOAST: "DISMISS_TOAST",
+  REMOVE_TOAST: "REMOVE_TOAST",
+} as const
+
 let count = 0
 
 function genId() {
@@ -25,21 +32,23 @@ function genId() {
   return count.toString()
 }
 
+type ActionType = typeof actionTypes
+
 type Action =
   | {
-      type: "ADD_TOAST"
+      type: ActionType["ADD_TOAST"]
       toast: ToasterToast
     }
   | {
-      type: "UPDATE_TOAST"
+      type: ActionType["UPDATE_TOAST"]
       toast: Partial<ToasterToast>
     }
   | {
-      type: "DISMISS_TOAST"
+      type: ActionType["DISMISS_TOAST"]
       toastId?: ToasterToast["id"]
     }
   | {
-      type: "REMOVE_TOAST"
+      type: ActionType["REMOVE_TOAST"]
       toastId?: ToasterToast["id"]
     }
 

frontend/src/components/users/InheritDialogue.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import { useState } from 'react'
 
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
@@ -20,7 +18,7 @@ type Props = { visible:         boolean
 	       setUser:         (user: User) => void }
 
 
-const InheritDialogue: FC<Props> = ({ visible, onVisibleChange, setUser }) => {
+export default ({ visible, onVisibleChange, setUser }: Props) => {
   const dialogue = useDialogue ()
 
   const [inputCode, setInputCode] = useState ('')
@@ -70,5 +68,3 @@ const InheritDialogue: FC<Props> = ({ visible, onVisibleChange, setUser }) => {
 	</DialogContent>
       </Dialog>)
 }
-
-export default InheritDialogue

frontend/src/components/users/UserCodeDialogue.tsx

@@ -1,5 +1,3 @@
-import type { FC } from 'react'
-
 import { useDialogue } from '@/components/dialogues/DialogueProvider'
 import { Button } from '@/components/ui/button'
 import { Dialog,
@@ -19,7 +17,7 @@ type Props = { visible:         boolean
 	       setUser:         React.Dispatch<React.SetStateAction<User | null>> }
 
 
-const UserCodeDialogue: FC<Props> = ({ visible, onVisibleChange, user, setUser }) => {
+export default ({ visible, onVisibleChange, user, setUser }: Props) => {
   const dialogue = useDialogue ()
 
   const handleChange = async () => {
@@ -71,5 +69,3 @@ const UserCodeDialogue: FC<Props> = ({ visible, onVisibleChange, user, setUser }
 	</DialogContent>
       </Dialog>)
 }
-
-export default UserCodeDialogue

frontend/src/lib/api.test.ts

@@ -1,96 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-const mocks = vi.hoisted (() => {
-  const client = {
-    delete: vi.fn (),
-    get:    vi.fn (),
-    patch:  vi.fn (),
-    post:   vi.fn (),
-    put:    vi.fn (),
-  }
-
-  return {
-    client,
-    isAxiosError: vi.fn (),
-  }
-})
-
-vi.mock ('axios', () => ({
-  default: {
-    create:       vi.fn (() => mocks.client),
-    isAxiosError: mocks.isAxiosError,
-  },
-}))
-
-vi.mock ('@/config', () => ({
-  API_BASE_URL: '/api',
-}))
-
-describe ('api helpers', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    localStorage.clear ()
-  })
-
-  it ('adds the transfer code header and camelizes get responses', async () => {
-    localStorage.setItem ('user_code', 'abc123')
-    mocks.client.get.mockResolvedValueOnce ({
-      data: { post_id: 1, nested_value: { created_at: 'now' } },
-    })
-
-    const { apiGet } = await import ('@/lib/api')
-    const data = await apiGet<{ postId: number; nestedValue: { createdAt: string } }> (
-        '/posts/1',
-        { headers: { 'X-Extra': '1' }, params: { page: 2 } },
-    )
-
-    expect (mocks.client.get).toHaveBeenCalledWith (
-        '/posts/1',
-        {
-          headers: { 'X-Transfer-Code': 'abc123', 'X-Extra': '1' },
-          params:  { page: 2 },
-        },
-    )
-    expect (data).toEqual ({ postId: 1, nestedValue: { createdAt: 'now' } })
-  })
-
-  it ('passes an empty body for post-like requests when body is omitted', async () => {
-    mocks.client.patch.mockResolvedValueOnce ({ data: { ok_value: true } })
-
-    const { apiPatch } = await import ('@/lib/api')
-    const data = await apiPatch<{ okValue: boolean }> ('/posts/1')
-
-    expect (mocks.client.patch).toHaveBeenCalledWith (
-        '/posts/1',
-        {},
-        { headers: { 'X-Transfer-Code': '' } },
-    )
-    expect (data.okValue).toBe (true)
-  })
-
-  it ('does not camelize blob responses', async () => {
-    const blob = new Blob (['csv'])
-    mocks.client.get.mockResolvedValueOnce ({ data: blob })
-
-    const { apiGet } = await import ('@/lib/api')
-    const data = await apiGet<Blob> ('/exports', { responseType: 'blob' })
-
-    expect (data).toBe (blob)
-  })
-
-  it ('delegates deletes and exposes axios error detection', async () => {
-    const err = new Error ('bad')
-    mocks.client.delete.mockResolvedValueOnce ({})
-    mocks.isAxiosError.mockReturnValueOnce (true)
-
-    const { apiDelete, isApiError } = await import ('@/lib/api')
-    await apiDelete ('/posts/1')
-
-    expect (mocks.client.delete).toHaveBeenCalledWith (
-        '/posts/1',
-        { headers: { 'X-Transfer-Code': '' } },
-    )
-    expect (isApiError (err)).toBe (true)
-    expect (mocks.isAxiosError).toHaveBeenCalledWith (err)
-  })
-})

frontend/src/lib/api.ts

@@ -28,7 +28,7 @@ const apiP = async <T> (
   const res = await client[method] (path, body ?? { }, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
-  return toCamel (res.data as Record<string, unknown>, { deep: true }) as T
+  return toCamel (res.data as any, { deep: true }) as T
 }
 
 
@@ -39,7 +39,7 @@ export const apiGet = async <T> (
   const res = await client.get (path, withUserCode (opt))
   if (opt?.responseType === 'blob')
     return res.data as T
-  return toCamel (res.data as Record<string, unknown>, { deep: true }) as T
+  return toCamel (res.data as any, { deep: true }) as T
 }
 
 
@@ -72,5 +72,4 @@ export const apiDelete = async (
 }
 
 
-export const isApiError = <T = unknown> (err: unknown): err is AxiosError<T> =>
+export const isApiError = (err: unknown): err is AxiosError => axios.isAxiosError (err)
-    axios.isAxiosError (err)

frontend/src/lib/apiErrors.ts

@@ -1,30 +0,0 @@
-import toCamel from 'camelcase-keys'
-
-import { isApiError } from '@/lib/api'
-
-export type FieldErrors = Partial<Record<string, string[]>>
-
-export type ValidationError = { message:      string
-				fieldErrors:  FieldErrors
-				baseErrors:   string[] }
-
-type RawValidationError = { type?:        string
-			    message?:     string
-			    errors?:      Record<string, string[]>
-			    baseErrors?:  string[] }
-
-
-export const extractValidationError = (err: unknown) => {
-  if (!(isApiError (err)) || err.response?.status !== 422)
-    return null
-
-  const data = toCamel ((err.response.data ?? { }) as Record<string, unknown>,
-			{ deep: true }) as RawValidationError
-
-  if (data.type !== 'validation_error' && !(data.errors))
-    return null
-
-  return { message: data.message ?? '入力内容を確認してください．',
-	   fieldErrors: (data.errors ?? { }) as FieldErrors,
-	   baseErrors: data.baseErrors ?? [] }
-}

frontend/src/lib/posts.test.ts

@@ -1,117 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchPostChanges, fetchPosts, toggleViewedFlg, updatePost } from '@/lib/posts'
-
-import type { FetchPostsParams } from '@/types'
-
-const api = vi.hoisted (() => ({
-  apiDelete: vi.fn (),
-  apiGet:    vi.fn (),
-  apiPost:   vi.fn (),
-  apiPut:    vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-const baseParams: FetchPostsParams = {
-  url:                 '',
-  title:               '',
-  tags:                '',
-  match:               'all',
-  originalCreatedFrom: '',
-  originalCreatedTo:   '',
-  createdFrom:         '',
-  createdTo:           '',
-  updatedFrom:         '',
-  updatedTo:           '',
-  page:                1,
-  limit:               20,
-  order:               'updated_at:desc',
-}
-
-describe ('posts API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('maps post search parameters to backend snake_case names', async () => {
-    api.apiGet.mockResolvedValueOnce ({ posts: [], count: 0 })
-
-    await fetchPosts ({
-      ...baseParams,
-      title:               'title',
-      tags:                'a b',
-      originalCreatedFrom: '2026-01-01',
-      updatedTo:           '2026-02-01',
-    })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/posts',
-        {
-          params: {
-            title:                 'title',
-            tags:                  'a b',
-            match:                 'all',
-            original_created_from: '2026-01-01',
-            updated_to:            '2026-02-01',
-            page:                  1,
-            limit:                 20,
-            order:                 'updated_at:desc',
-          },
-        },
-    )
-  })
-
-  it ('updates posts with version and merge controls', async () => {
-    api.apiPut.mockResolvedValueOnce ({ id: 5 })
-
-    await updatePost (
-        {
-          id:                    5,
-          title:                 'new title',
-          tags:                  'tag',
-          parentPostIds:         '1 2',
-          originalCreatedFrom:   null,
-          originalCreatedBefore: '2026-01-02T00:00:00Z',
-        },
-        { baseVersionNo: 7, force: true, merge: false },
-    )
-
-    expect (api.apiPut).toHaveBeenCalledWith (
-        '/posts/5',
-        {
-          title:                   'new title',
-          tags:                    'tag',
-          parent_post_ids:         '1 2',
-          original_created_from:   null,
-          original_created_before: '2026-01-02T00:00:00Z',
-        },
-        {
-          params: {
-            base_version_no: '7',
-            force:           '1',
-            merge:           '0',
-          },
-        },
-    )
-  })
-
-  it ('uses the viewed endpoint method matching the requested state', async () => {
-    await toggleViewedFlg ('9', true)
-    await toggleViewedFlg ('9', false)
-
-    expect (api.apiPost).toHaveBeenCalledWith ('/posts/9/viewed')
-    expect (api.apiDelete).toHaveBeenCalledWith ('/posts/9/viewed')
-  })
-
-  it ('keeps optional post history filters out when blank', async () => {
-    api.apiGet.mockResolvedValueOnce ({ versions: [], count: 0 })
-
-    await fetchPostChanges ({ page: 2, limit: 50 })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/posts/versions',
-        { params: { page: 2, limit: 50 } },
-    )
-  })
-})

frontend/src/lib/prefetchers.test.ts

@@ -1,112 +0,0 @@
-import { QueryClient } from '@tanstack/react-query'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { prefetchForURL } from '@/lib/prefetchers'
-
-const postsApi = vi.hoisted (() => ({
-  fetchPost:        vi.fn (),
-  fetchPostChanges: vi.fn (),
-  fetchPosts:       vi.fn (),
-}))
-
-const tagsApi = vi.hoisted (() => ({
-  fetchTag:        vi.fn (),
-  fetchTagByName:  vi.fn (),
-  fetchTagChanges: vi.fn (),
-  fetchTags:       vi.fn (),
-}))
-
-const wikiApi = vi.hoisted (() => ({
-  fetchWikiPage:        vi.fn (),
-  fetchWikiPageByTitle: vi.fn (),
-  fetchWikiPages:       vi.fn (),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/tags', () => tagsApi)
-vi.mock ('@/lib/wiki', () => wikiApi)
-
-const qc = () => new QueryClient ({
-  defaultOptions: { queries: { retry: false } },
-})
-
-describe ('prefetchForURL', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    postsApi.fetchPosts.mockResolvedValue ({ posts: [], count: 0 })
-    postsApi.fetchPost.mockResolvedValue ({ id: 1 })
-    postsApi.fetchPostChanges.mockResolvedValue ({ versions: [], count: 0 })
-    tagsApi.fetchTags.mockResolvedValue ({ tags: [], count: 0 })
-    tagsApi.fetchTag.mockResolvedValue ({ id: 1 })
-    tagsApi.fetchTagByName.mockResolvedValue (null)
-    tagsApi.fetchTagChanges.mockResolvedValue ({ versions: [], count: 0 })
-    wikiApi.fetchWikiPages.mockResolvedValue ([])
-    wikiApi.fetchWikiPage.mockResolvedValue ({ id: 1 })
-    wikiApi.fetchWikiPageByTitle.mockResolvedValue (null)
-  })
-
-  it ('prefetches post indexes from query parameters', async () => {
-    await prefetchForURL (
-        qc (),
-        'http://localhost/posts?tags=a+b&match=any&page=2&limit=5&order=title%3Aasc',
-    )
-
-    expect (postsApi.fetchPosts).toHaveBeenCalledWith (
-        expect.objectContaining ({
-          tags:  'a b',
-          match: 'any',
-          page:  2,
-          limit: 5,
-          order: 'title:asc',
-        }),
-    )
-  })
-
-  it ('prefetches post detail pages', async () => {
-    await prefetchForURL (qc (), 'http://localhost/posts/12')
-
-    expect (postsApi.fetchPost).toHaveBeenCalledWith ('12')
-  })
-
-  it ('prefetches tag indexes from query parameters', async () => {
-    await prefetchForURL (
-        qc (),
-        'http://localhost/tags?post=9&name=x&category=general&page=4&post_count_lte=10',
-    )
-
-    expect (tagsApi.fetchTags).toHaveBeenCalledWith (
-        expect.objectContaining ({
-          post:         9,
-          name:         'x',
-          category:     'general',
-          page:         4,
-          postCountLTE: 10,
-        }),
-    )
-  })
-
-  it ('prefetches wiki show pages and related tag/post data', async () => {
-    wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce ({
-      id:    3,
-      title: 'Actual',
-      body:  'body',
-    })
-
-    await prefetchForURL (qc (), 'http://localhost/wiki/Alias')
-
-    expect (wikiApi.fetchWikiPageByTitle).toHaveBeenCalledWith ('Alias', { version: undefined })
-    expect (wikiApi.fetchWikiPage).toHaveBeenCalledWith ('3', {})
-    expect (tagsApi.fetchTagByName).toHaveBeenCalledWith ('Actual')
-    expect (postsApi.fetchPosts).toHaveBeenCalledWith (
-        expect.objectContaining ({ tags: 'Actual', limit: 8 }),
-    )
-  })
-
-  it ('ignores routes without a prefetcher', async () => {
-    await prefetchForURL (qc (), 'http://localhost/unknown')
-
-    expect (postsApi.fetchPosts).not.toHaveBeenCalled ()
-    expect (tagsApi.fetchTags).not.toHaveBeenCalled ()
-    expect (wikiApi.fetchWikiPages).not.toHaveBeenCalled ()
-  })
-})

frontend/src/lib/queryKeys.test.ts

@@ -1,14 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
-
-describe ('query keys', () => {
-  it ('uses stable namespaces for posts, tags, and wiki', () => {
-    expect (postsKeys.show ('3')).toEqual (['posts', '3'])
-    expect (postsKeys.related ('3')).toEqual (['related', '3'])
-    expect (tagsKeys.deerjikists ('7')).toEqual (['tags', 'deerjikists', '7'])
-    expect (wikiKeys.show ('Title', { version: '2' })).toEqual (
-        ['wiki', 'Title', { version: '2' }],
-    )
-  })
-})

frontend/src/lib/remark-wiki-autolink.test.ts

@@ -1,68 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import remarkWikiAutolink from '@/lib/remark-wiki-autolink'
-
-import type { Root } from 'mdast'
-
-describe ('remarkWikiAutolink', () => {
-  it ('links matching wiki page names and prefers longer matches', () => {
-    const tree: Root = {
-      type:     'root',
-      children: [{
-        type:     'paragraph',
-        children: [{ type: 'text', value: '虹夏 and 虹' }],
-      }],
-    }
-
-    remarkWikiAutolink (['虹', '虹夏']) (tree)
-
-    expect (tree.children[0]).toMatchObject ({
-      type:     'paragraph',
-      children: [
-        {
-          type:     'link',
-          url:      '/wiki/%E8%99%B9%E5%A4%8F',
-          children: [{ type: 'text', value: '虹夏' }],
-        },
-        { type: 'text', value: ' and ' },
-        {
-          type:     'link',
-          url:      '/wiki/%E8%99%B9',
-          children: [{ type: 'text', value: '虹' }],
-        },
-      ],
-    })
-  })
-
-  it ('does not link text inside existing links or code', () => {
-    const tree: Root = {
-      type:     'root',
-      children: [
-        {
-          type:     'paragraph',
-          children: [{
-            type:     'link',
-            url:      '/existing',
-            children: [{ type: 'text', value: '虹' }],
-          }],
-        },
-        {
-          type:  'code',
-          value: '虹',
-        },
-      ],
-    }
-
-    remarkWikiAutolink (['虹']) (tree)
-
-    expect (tree.children[0]).toMatchObject ({
-      type:     'paragraph',
-      children: [{
-        type:     'link',
-        url:      '/existing',
-        children: [{ type: 'text', value: '虹' }],
-      }],
-    })
-    expect (tree.children[1]).toMatchObject ({ type: 'code', value: '虹' })
-  })
-})

frontend/src/lib/remark-wiki-autolink.ts

@@ -38,7 +38,7 @@ export default (pageNames: string[], basePath = '/wiki'): ((tree: Root) => void)
 	      let last = 0
 	      const parts: RootContent[] = []
 
-	      while ((m = re.exec (value)) !== null)
+	      while (m = re.exec (value))
 		{
 		  const start = m.index
 		  const end = start + m[0].length
@@ -70,7 +70,7 @@ export default (pageNames: string[], basePath = '/wiki'): ((tree: Root) => void)
 	    }
 	}
 
-      const maybeChidren = 'children' in node ? node.children : undefined
+      const maybeChidren = (node as any).children
       if (Array.isArray (maybeChidren))
 	{
 	  const parent = node as Parent

frontend/src/lib/tags.test.ts

@@ -1,67 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchTag, fetchTagByName, fetchTags } from '@/lib/tags'
-
-import type { FetchTagsParams } from '@/types'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-const baseParams: FetchTagsParams = {
-  post:         null,
-  name:         '',
-  category:     null,
-  postCountGTE: 0,
-  postCountLTE: null,
-  createdFrom:  '',
-  createdTo:    '',
-  updatedFrom:  '',
-  updatedTo:    '',
-  page:         1,
-  limit:        30,
-  order:        'updated_at:desc',
-}
-
-describe ('tags API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('maps tag filters to backend parameters', async () => {
-    api.apiGet.mockResolvedValueOnce ({ tags: [], count: 0 })
-
-    await fetchTags ({
-      ...baseParams,
-      name:         '虹',
-      category:     'character',
-      postCountGTE: 10,
-      postCountLTE: 20,
-    })
-
-    expect (api.apiGet).toHaveBeenCalledWith (
-        '/tags',
-        {
-          params: {
-            name:           '虹',
-            category:       'character',
-            post_count_gte: 10,
-            post_count_lte: 20,
-            page:           1,
-            limit:          30,
-            order:          'updated_at:desc',
-          },
-        },
-    )
-  })
-
-  it ('returns null when tag fetches fail', async () => {
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-
-    await expect (fetchTag ('1')).resolves.toBeNull ()
-    await expect (fetchTagByName ('unknown')).resolves.toBeNull ()
-  })
-})

frontend/src/lib/utils.test.ts

@@ -1,28 +0,0 @@
-import { describe, expect, it } from 'vitest'
-
-import { cn, originalCreatedAtString, toDate } from '@/lib/utils'
-
-describe ('utils', () => {
-  it ('converts strings to dates and leaves date instances intact', () => {
-    const date = new Date ('2026-01-02T03:04:05Z')
-
-    expect (toDate ('2026-01-02T03:04:05Z')).toBeInstanceOf (Date)
-    expect (toDate (date)).toBe (date)
-  })
-
-  it ('merges conditional Tailwind classes', () => {
-    const hidden = false
-
-    expect (cn ('p-2', hidden && 'hidden', 'p-4')).toBe ('p-4')
-  })
-
-  it ('renders unknown original creation time ranges', () => {
-    expect (originalCreatedAtString (null, null)).toBe ('年月日不詳')
-    expect (
-        originalCreatedAtString (
-            '2026-01-01T00:00:00+09:00',
-            '2026-01-02T00:00:00+09:00',
-        ),
-    ).toContain ('時刻不詳')
-  })
-})

frontend/src/lib/wiki.test.ts

@@ -1,48 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import { fetchWikiPage, fetchWikiPageByTitle, fetchWikiPages } from '@/lib/wiki'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('wiki API functions', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-  })
-
-  it ('fetches wiki index and show pages with expected parameters', async () => {
-    api.apiGet.mockResolvedValueOnce ([])
-    api.apiGet.mockResolvedValueOnce ({ id: 1 })
-
-    await fetchWikiPages ({ title: '虹' })
-    await fetchWikiPage ('1', { version: '3' })
-
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        1,
-        '/wiki',
-        { params: { title: '虹' } },
-    )
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        2,
-        '/wiki/1',
-        { params: { version: '3' } },
-    )
-  })
-
-  it ('encodes title path segments and returns null on misses', async () => {
-    api.apiGet.mockResolvedValueOnce ({ id: 2 })
-    api.apiGet.mockRejectedValueOnce (new Error ('missing'))
-
-    await fetchWikiPageByTitle ('a/b c', { version: undefined })
-    await expect (fetchWikiPageByTitle ('missing', {})).resolves.toBeNull ()
-
-    expect (api.apiGet).toHaveBeenNthCalledWith (
-        1,
-        '/wiki/title/a%2Fb%20c',
-        { params: { version: undefined } },
-    )
-  })
-})

frontend/src/pages/Forbidden.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const Forbidden: FC = () => <ErrorScreen status={403}/>
+export default () => <ErrorScreen status={403}/>
-
-export default Forbidden

frontend/src/pages/MorePage.tsx

@@ -11,7 +11,7 @@ import type { FC } from 'react'
 import type { User } from '@/types'
 
 
-const MorePage: FC = () => {
+export default (() => {
   const menu = menuOutline (
       { tag: null, wikiId: null, user: { } as User, pathName: location.pathname })
 
@@ -43,6 +43,4 @@ const MorePage: FC = () => {
 		  </section>))}
 	    </div>))}
       </MainArea>)
-}
+}) satisfies FC
-
-export default MorePage

frontend/src/pages/NotFound.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const NotFound: FC = () => <ErrorScreen status={404}/>
+export default () => <ErrorScreen status={404}/>
-
-export default NotFound

frontend/src/pages/ServiceUnavailable.tsx

@@ -1,8 +1,4 @@
-import type { FC } from 'react'
-
 import ErrorScreen from '@/components/ErrorScreen'
 
 
-const ServiceUnavailable: FC = () => <ErrorScreen status={503}/>
+export default () => <ErrorScreen status={503}/>
-
-export default ServiceUnavailable

frontend/src/pages/deerjikists/DeerjikistDetailPage.tsx

@@ -1,5 +1,5 @@
 import { useQuery, useQueryClient } from '@tanstack/react-query'
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { useParams } from 'react-router-dom'
 
 import TagLink from '@/components/TagLink'
@@ -18,7 +18,7 @@ import type { FC, FormEvent } from 'react'
 import type { Deerjikist, Platform } from '@/types'
 
 
-const DeerjikistDetailPage: FC = () => {
+export default (() => {
   const { id } = useParams ()
   const tagId = String (id ?? '')
   const tagKey = tagsKeys.deerjikists (tagId)
@@ -26,7 +26,7 @@ const DeerjikistDetailPage: FC = () => {
   const { data: qData, isLoading: loading } =
       useQuery ({ queryKey: tagKey, queryFn: () => fetchDeerjikistsByTag (tagId) })
   const tag = qData?.tag
-  const deerjikists = useMemo (() => qData?.deerjikists ?? [], [qData])
+  const deerjikists = qData?.deerjikists ?? []
 
   const [data, setData] =
       useState<(Omit<Deerjikist, 'platform'> & { platform: Platform | null })[]> ([])
@@ -152,6 +152,4 @@ const DeerjikistDetailPage: FC = () => {
 	    </div>
 	)}
       </MainArea>)
-}
+}) satisfies FC
-
-export default DeerjikistDetailPage

frontend/src/pages/materials/MaterialBasePage.test.tsx

@@ -1,26 +0,0 @@
-import { screen } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
-import { describe, expect, it, vi } from 'vitest'
-
-import MaterialBasePage from '@/pages/materials/MaterialBasePage'
-import { renderWithProviders } from '@/test/render'
-
-vi.mock ('@/components/MaterialSidebar', () => ({
-  default: () => <aside>Material sidebar</aside>,
-}))
-
-describe ('MaterialBasePage', () => {
-  it ('renders the material sidebar and nested route outlet', () => {
-    renderWithProviders (
-        <Routes>
-          <Route path="/materials" element={<MaterialBasePage/>}>
-            <Route index element={<div>Outlet content</div>}/>
-          </Route>
-        </Routes>,
-        { route: '/materials' },
-    )
-
-    expect (screen.getByText ('Material sidebar')).toBeInTheDocument ()
-    expect (screen.getByText ('Outlet content')).toBeInTheDocument ()
-  })
-})

frontend/src/pages/materials/MaterialBasePage.tsx

@@ -5,10 +5,8 @@ import MaterialSidebar from '@/components/MaterialSidebar'
 import type { FC } from 'react'
 
 
-const MaterialBasePage: FC = () => (
+export default (() => (
     <div className="md:flex md:flex-1 overflow-y-auto md:overflow-y-hidden">
       <MaterialSidebar/>
       <Outlet/>
-    </div>)
+    </div>)) satisfies FC
-
-export default MaterialBasePage

frontend/src/pages/materials/MaterialDetailPage.test.tsx

@@ -1,86 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
-import { buildMaterial, buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-  apiPut: vi.fn (),
-}))
-
-const wikiApi = vi.hoisted (() => ({
-  fetchWikiPages: vi.fn (),
-}))
-
-const toastApi = vi.hoisted (() => ({
-  toast: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/lib/wiki', () => wikiApi)
-vi.mock ('@/components/ui/use-toast', () => toastApi)
-
-const renderPage = () =>
-  renderWithProviders (
-      <Routes>
-        <Route path="/materials/:id" element={<MaterialDetailPage/>}/>
-      </Routes>,
-      { route: '/materials/8' },
-  )
-
-describe ('MaterialDetailPage', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    api.apiGet.mockResolvedValue ([])
-    wikiApi.fetchWikiPages.mockResolvedValue ([])
-    vi.stubGlobal ('fetch', vi.fn (async () => ({
-      blob: async () => new Blob (['image'], { type: 'image/png' }),
-    })))
-  })
-
-  it ('loads and displays material detail', async () => {
-    api.apiGet.mockResolvedValueOnce (
-        buildMaterial ({
-          id:          8,
-          tag:         buildTag ({ name: '素材タグ' }),
-          file:        'image.png',
-          contentType: 'image/png',
-        }),
-    )
-
-    renderPage ()
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith ('/materials/8')
-    })
-    expect (await screen.findByAltText ('素材タグ')).toHaveAttribute ('src', 'image.png')
-  })
-
-  it ('submits edited material fields', async () => {
-    api.apiGet.mockResolvedValueOnce (
-        buildMaterial ({ id: 8, tag: buildTag ({ name: 'old' }), url: '' }),
-    )
-    api.apiPut.mockResolvedValueOnce (
-        buildMaterial ({ id: 8, tag: buildTag ({ name: 'new' }) }),
-    )
-
-    renderPage ()
-
-    fireEvent.click (await screen.findByText ('編輯'))
-    const textboxes = screen.getAllByRole ('textbox')
-    fireEvent.change (textboxes[0], { target: { value: 'new' } })
-    fireEvent.change (textboxes[1], { target: { value: 'https://example.com/ref' } })
-    fireEvent.click (screen.getByRole ('button', { name: '更新' }))
-
-    await waitFor (() => {
-      expect (api.apiPut).toHaveBeenCalledWith ('/materials/8', expect.any (FormData))
-    })
-    const formData = api.apiPut.mock.calls[0]?.[1] as FormData
-    expect (formData.get ('tag')).toBe ('new')
-    expect (formData.get ('url')).toBe ('https://example.com/ref')
-    expect (toastApi.toast).toHaveBeenCalledWith ({ title: '更新成功!' })
-  })
-})

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -21,7 +21,7 @@ import type { Material, Tag } from '@/types'
 type MaterialWithTag = Material & { tag: Tag }
 
 
-const MaterialDetailPage: FC = () => {
+export default (() => {
   const { id } = useParams ()
 
   const [file, setFile] = useState<File | null> (null)
@@ -179,6 +179,4 @@ const MaterialDetailPage: FC = () => {
 	      </TabGroup>
 	    </>))}
       </MainArea>)
-}
+}) satisfies FC
-
-export default MaterialDetailPage

frontend/src/pages/materials/MaterialListPage.test.tsx

@@ -1,62 +0,0 @@
-import { screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import MaterialListPage from '@/pages/materials/MaterialListPage'
-import { buildMaterial, buildTag } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const api = vi.hoisted (() => ({
-  apiGet: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-
-describe ('MaterialListPage', () => {
-  it ('shows the empty selection guide without a tag query', () => {
-    renderWithProviders (<MaterialListPage/>, { route: '/materials' })
-
-    expect (screen.getByText ('左のリストから照会したいタグを選択してください。')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '素材を新規追加する' })).toHaveAttribute (
-        'href',
-        '/materials/new',
-    )
-  })
-
-  it ('loads materials for a tag query', async () => {
-    const tag = {
-      ...buildTag ({
-        id:       4,
-        name:     '素材タグ',
-        category: 'material',
-      }),
-      material: buildMaterial ({ id: 8, contentType: 'image/png', file: 'image.png' }),
-      children: [],
-    }
-    api.apiGet.mockResolvedValueOnce (tag)
-
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=%E7%B4%A0%E6%9D%90' })
-
-    await waitFor (() => {
-      expect (api.apiGet).toHaveBeenCalledWith (
-          '/tags/name/%E7%B4%A0%E6%9D%90/materials',
-      )
-    })
-    expect (await screen.findByRole ('link', { name: '素材タグ' })).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: '' })).toHaveAttribute ('href', '/materials/8')
-  })
-
-  it ('offers adding a missing non-meme material', async () => {
-    api.apiGet.mockResolvedValueOnce ({
-      ...buildTag ({ name: '未登録', category: 'material' }),
-      material: null,
-      children: [],
-    })
-
-    renderWithProviders (<MaterialListPage/>, { route: '/materials?tag=x' })
-
-    expect (await screen.findByRole ('link', { name: '追加' })).toHaveAttribute (
-        'href',
-        '/materials/new?tag=%E6%9C%AA%E7%99%BB%E9%8C%B2',
-    )
-  })
-})

frontend/src/pages/materials/MaterialListPage.tsx

@@ -41,7 +41,7 @@ const MaterialCard = ({ tag }: { tag: TagWithMaterial }) => {
 }
 
 
-const MaterialListPage: FC = () => {
+export default (() => {
   const [loading, setLoading] = useState (false)
   const [tag, setTag] = useState<TagWithMaterial | null> (null)
 
@@ -69,7 +69,7 @@ const MaterialListPage: FC = () => {
 	setLoading (false)
       }
     }) ()
-  }, [location.search, tagQuery])
+  }, [location.search])
 
   return (
       <MainArea>
@@ -163,6 +163,4 @@ const MaterialListPage: FC = () => {
 		  </ul>
 		</>))}
       </MainArea>)
-}
+}) satisfies FC
-
-export default MaterialListPage

frontend/src/pages/materials/MaterialNewPage.test.tsx

@@ -1,38 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import MaterialNewPage from '@/pages/materials/MaterialNewPage'
-import { renderWithProviders } from '@/test/render'
-
-const api = vi.hoisted (() => ({
-  apiPost: vi.fn (),
-}))
-
-const toastApi = vi.hoisted (() => ({
-  toast: vi.fn (),
-}))
-
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/components/ui/use-toast', () => toastApi)
-
-describe ('MaterialNewPage', () => {
-  it ('initializes tag from query and submits form data', async () => {
-    api.apiPost.mockResolvedValueOnce ({})
-
-    renderWithProviders (<MaterialNewPage/>, { route: '/materials/new?tag=%E8%99%B9%E5%A4%8F' })
-
-    expect (screen.getAllByRole ('textbox')[0]).toHaveValue ('虹夏')
-    fireEvent.change (screen.getAllByRole ('textbox')[1], {
-      target: { value: 'https://example.com/ref' },
-    })
-    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
-
-    await waitFor (() => {
-      expect (api.apiPost).toHaveBeenCalledWith ('/materials', expect.any (FormData))
-    })
-    const formData = api.apiPost.mock.calls[0]?.[1] as FormData
-    expect (formData.get ('tag')).toBe ('虹夏')
-    expect (formData.get ('url')).toBe ('https://example.com/ref')
-    expect (toastApi.toast).toHaveBeenCalledWith ({ title: '送信成功!' })
-  })
-})

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -15,7 +15,7 @@ import { apiPost } from '@/lib/api'
 import type { FC } from 'react'
 
 
-const MaterialNewPage: FC = () => {
+export default (() => {
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
   const tagQuery = query.get ('tag') ?? ''
@@ -121,6 +121,4 @@ const MaterialNewPage: FC = () => {
 	  </Button>
 	</Form>
       </MainArea>)
-}
+}) satisfies FC
-
-export default MaterialNewPage

frontend/src/pages/materials/MaterialSearchPage.tsx

@@ -10,7 +10,7 @@ import { SITE_TITLE } from '@/config'
 import type { FC, FormEvent } from 'react'
 
 
-const MaterialSearchPage: FC = () => {
+export default (() => {
   const [tagName, setTagName] = useState ('')
   const [parentTagName, setParentTagName] = useState ('')
 
@@ -46,6 +46,4 @@ const MaterialSearchPage: FC = () => {
 	  </form>
 	</div>
       </MainArea>)
-}
+}) satisfies FC
-
-export default MaterialSearchPage

frontend/src/pages/posts/PostDetailPage.test.tsx

@@ -1,109 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
-import { beforeEach, describe, expect, it, vi } from 'vitest'
-
-import PostDetailPage from '@/pages/posts/PostDetailPage'
-import { buildPost, buildUser } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-import type { ReactNode } from 'react'
-
-const postsApi = vi.hoisted (() => ({
-  fetchPost:       vi.fn (),
-  toggleViewedFlg: vi.fn (),
-}))
-
-const api = vi.hoisted (() => ({
-  isApiError: vi.fn (() => false),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/api', () => api)
-vi.mock ('@/components/PostEmbed', () => ({
-  default: ({ post }: { post: { url: string } }) => <div>Embed:{post.url}</div>,
-}))
-vi.mock ('@/components/TagDetailSidebar', () => ({
-  default: () => <aside>Tag sidebar</aside>,
-}))
-vi.mock ('@/components/PostEditForm', () => ({
-  default: () => <div>Post edit form</div>,
-}))
-vi.mock ('framer-motion', () => ({
-  motion: {
-    div: ({ children }: { children?: ReactNode }) => <div>{children}</div>,
-    main: ({ children }: { children?: ReactNode }) => <main>{children}</main>,
-  },
-}))
-
-const renderPage = (user = buildUser ({ role: 'member' })) =>
-  renderWithProviders (
-      <Routes>
-        <Route path="/posts/:id" element={<PostDetailPage user={user}/>}/>
-      </Routes>,
-      { route: '/posts/9' },
-  )
-
-describe ('PostDetailPage', () => {
-  beforeEach (() => {
-    vi.clearAllMocks ()
-    postsApi.toggleViewedFlg.mockResolvedValue (undefined)
-  })
-
-  it ('loads and displays a post detail', async () => {
-    postsApi.fetchPost.mockResolvedValue (
-        buildPost ({
-          id:            9,
-          url:           'https://example.com/9',
-          related:       [],
-          thumbnail:     null,
-          thumbnailBase: null,
-        }),
-    )
-
-    renderPage ()
-
-    await waitFor (() => {
-      expect (postsApi.fetchPost).toHaveBeenCalledWith ('9')
-    })
-    expect (await screen.findByText ('Embed:https://example.com/9')).toBeInTheDocument ()
-    expect (screen.getByRole ('button', { name: '未閲覧' })).toBeInTheDocument ()
-    expect (screen.getByText ('まだないよ（笑）')).toBeInTheDocument ()
-  })
-
-  it ('toggles viewed state through the mutation', async () => {
-    postsApi.fetchPost.mockResolvedValue (
-        buildPost ({ id: 9, viewed: false, thumbnail: null, thumbnailBase: null }),
-    )
-
-    renderPage ()
-
-    fireEvent.click (await screen.findByRole ('button', { name: '未閲覧' }))
-
-    await waitFor (() => {
-      expect (postsApi.toggleViewedFlg).toHaveBeenCalledWith ('9', true)
-    })
-  })
-
-  it ('shows the edit tab for members', async () => {
-    postsApi.fetchPost.mockResolvedValue (
-        buildPost ({ id: 9, thumbnail: null, thumbnailBase: null }),
-    )
-
-    renderPage (buildUser ({ role: 'member' }))
-
-    fireEvent.click (await screen.findByText ('編輯'))
-
-    expect (screen.getByText ('Post edit form')).toBeInTheDocument ()
-  })
-
-  it ('hides the edit tab for guests', async () => {
-    postsApi.fetchPost.mockResolvedValue (
-        buildPost ({ id: 9, thumbnail: null, thumbnailBase: null }),
-    )
-
-    renderPage (buildUser ({ role: 'guest' }))
-
-    expect (await screen.findByText ('関聯')).toBeInTheDocument ()
-    expect (screen.queryByText ('編輯')).not.toBeInTheDocument ()
-  })
-})

frontend/src/pages/posts/PostDetailPage.tsx

@@ -3,6 +3,7 @@ import { motion } from 'framer-motion'
 import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useParams } from 'react-router-dom'
+
 import PostEditForm from '@/components/PostEditForm'
 import PostEmbed from '@/components/PostEmbed'
 import PostList from '@/components/PostList'
@@ -12,7 +13,6 @@ import MainArea from '@/components/layout/MainArea'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
-import { isApiError } from '@/lib/api'
 import { fetchPost, toggleViewedFlg } from '@/lib/posts'
 import { postsKeys, tagsKeys } from '@/lib/queryKeys'
 import { cn } from '@/lib/utils'
@@ -26,7 +26,7 @@ import type { NiconicoViewerHandle, Post, User } from '@/types'
 type Props = { user: User | null }
 
 
-const PostDetailPage: FC<Props> = ({ user }) => {
+export default (({ user }: Props) => {
   const { id } = useParams ()
   const postId = String (id ?? '')
   const postKey = postsKeys.show (postId)
@@ -43,15 +43,17 @@ const PostDetailPage: FC<Props> = ({ user }) => {
   const [status, setStatus] = useState (200)
 
   const changeViewedFlg = useMutation ({
-      mutationFn: async (next: boolean) => {
+      mutationFn: async () => {
+	const cur = qc.getQueryData<any> (postKey)
+	const next = !(cur?.viewed)
 	await toggleViewedFlg (postId, next)
 	return next
       },
-      onMutate: async (next: boolean) => {
+      onMutate: async () => {
 	await qc.cancelQueries ({ queryKey: postKey })
-	const prev = qc.getQueryData<Post> (postKey)
+	const prev = qc.getQueryData<any> (postKey)
 	qc.setQueryData (postKey,
-			 (cur: Post | undefined) => cur ? { ...cur, viewed: next } : cur)
+			 (cur: any) => cur ? { ...cur, viewed: !(cur.viewed) } : cur)
 	return { prev }
       },
       onError: (...[, , ctx]) => {
@@ -67,7 +69,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
     if (!(errorFlg))
       return
 
-    const code = isApiError (error) ? error.response?.status : undefined
+    const code = (error as any)?.response.status ?? (error as any)?.status
     if (code)
       setStatus (code)
   }, [errorFlg, error])
@@ -152,7 +154,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 		    ref={embedRef}
 		    post={post}
 		    onLoadComplete={() => embedRef.current?.play ()}/>
-		<Button onClick={() => changeViewedFlg.mutate (!(post.viewed))}
+		<Button onClick={() => changeViewedFlg.mutate ()}
 			disabled={changeViewedFlg.isPending}
 			className={cn ('text-white', viewedClass)}>
 		  {post.viewed ? '閲覧済' : '未閲覧'}
@@ -169,7 +171,7 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 			    post={post}
 			    onSave={newPost => {
 			      qc.setQueryData (postsKeys.show (postId),
-					       (prev: Post | undefined) => newPost ?? prev)
+					       (prev: any) => newPost ?? prev)
 			      qc.invalidateQueries ({ queryKey: postsKeys.root })
 			      qc.invalidateQueries ({ queryKey: tagsKeys.root })
 			    }}/>
@@ -183,6 +185,4 @@ const PostDetailPage: FC<Props> = ({ user }) => {
 	  {post && <TagDetailSidebar post={post} sp/>}
 	</div>
       </div>)
-}
+}) satisfies FC<Props>
-
-export default PostDetailPage

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -35,7 +35,7 @@ const renderDiff = (diff: { current: string | null; prev: string | null }) => (
     </>)
 
 
-const PostHistoryPage: FC = () => {
+export default (() => {
   const dialogue = useDialogue ()
 
   const location = useLocation ()
@@ -48,11 +48,11 @@ const PostHistoryPage: FC = () => {
   // 投稿列の結合で使用
   let rowsCnt: number
 
-  const tagQueryId = tagId ?? ''
+  const { data: tag } =
-  const { data: tag } = useQuery ({
+      tagId
-      enabled:  Boolean (tagId),
+      ? useQuery ({ queryKey: tagsKeys.show (tagId),
-      queryKey: tagsKeys.show (tagQueryId),
+		    queryFn: () => fetchTag (tagId) })
-      queryFn:  () => fetchTag (tagQueryId) })
+      : { data: null }
 
   const { data, isLoading: loading } = useQuery ({
       queryKey: postsKeys.changes ({ ...(id && { post: id }),
@@ -290,6 +290,4 @@ const PostHistoryPage: FC = () => {
 	      <Pagination page={page} totalPages={totalPages}/>
 	    </>)}
       </MainArea>)
-}
+}) satisfies FC
-
-export default PostHistoryPage

frontend/src/pages/posts/PostListPage.test.tsx

@@ -1,74 +0,0 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
-
-import PostListPage from '@/pages/posts/PostListPage'
-import { buildPost, buildTag, buildWikiPage } from '@/test/factories'
-import { renderWithProviders } from '@/test/render'
-
-const postsApi = vi.hoisted (() => ({
-  fetchPosts: vi.fn (),
-}))
-
-const wikiApi = vi.hoisted (() => ({
-  fetchWikiPageByTitle: vi.fn (),
-  fetchWikiPages:       vi.fn (),
-}))
-
-vi.mock ('@/lib/posts', () => postsApi)
-vi.mock ('@/lib/wiki', () => wikiApi)
-
-describe ('PostListPage', () => {
-  it ('loads posts from the current query and renders the plaza tab', async () => {
-    const tag = buildTag ({ name: '虹夏' })
-    postsApi.fetchPosts.mockResolvedValueOnce ({
-      posts: [buildPost ({ id: 5, title: '投稿5', tags: [tag] })],
-      count: 1,
-    })
-    wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce (buildWikiPage ({ title: '虹夏' }))
-    wikiApi.fetchWikiPages.mockResolvedValueOnce ([buildWikiPage ({ title: '虹夏' })])
-
-    renderWithProviders (<PostListPage/>, { route: '/posts?tags=%E8%99%B9%E5%A4%8F&page=2' })
-
-    await waitFor (() => {
-      expect (postsApi.fetchPosts).toHaveBeenCalledWith (
-          expect.objectContaining ({
-            tags:  '虹夏',
-            match: 'all',
-            page:  2,
-            limit: 20,
-          }),
-      )
-    })
-    expect (await screen.findByRole ('link', { name: '投稿5' })).toHaveAttribute (
-        'href',
-        '/posts/5',
-    )
-    expect (screen.getByText ('広場')).toBeInTheDocument ()
-  })
-
-  it ('shows the empty state when loading finishes without posts', async () => {
-    postsApi.fetchPosts.mockResolvedValueOnce ({ posts: [], count: 0 })
-
-    renderWithProviders (<PostListPage/>, { route: '/posts' })
-
-    expect (await screen.findByText ('広場には何もありませんよ．')).toBeInTheDocument ()
-  })
-
-  it ('renders the wiki tab for single-tag pages', async () => {
-    postsApi.fetchPosts.mockResolvedValueOnce ({ posts: [], count: 0 })
-    wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce (
-        buildWikiPage ({ title: '虹夏', body: 'Wiki body' }),
-    )
-    wikiApi.fetchWikiPages.mockResolvedValueOnce ([buildWikiPage ({ title: '虹夏' })])
-
-    renderWithProviders (<PostListPage/>, { route: '/posts?tags=%E8%99%B9%E5%A4%8F' })
-
-    fireEvent.click (await screen.findByText ('Wiki'))
-
-    expect (await screen.findByText ('Wiki body')).toBeInTheDocument ()
-    expect (screen.getByRole ('link', { name: 'Wiki を見る' })).toHaveAttribute (
-        'href',
-        '/wiki/%E8%99%B9%E5%A4%8F',
-    )
-  })
-})