diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 151e747..c230e92 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -2012,7 +2012,6 @@
       "version": "19.1.4",
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.1.4.tgz",
       "integrity": "sha512-EB1yiiYdvySuIITtD5lhW4yPyJ31RkJkkDw794LaQYrxCSaQV/47y5o1FMC4zF9ZyjUjzJMZwbovEnT5yHTW6g==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "csstype": "^3.0.2"
@@ -2022,7 +2021,7 @@
       "version": "19.1.5",
       "resolved": "https://registry.npmjs.org/@types/react-dom/-/react-dom-19.1.5.tgz",
       "integrity": "sha512-CMCjrWucUBZvohgZxkjd6S9h0nZxXjzus6yDfUb+xLxYM7VvjKNH1tQrE9GWLql1XoOP4/Ds3bwFqShHUYraGg==",
-      "dev": true,
+      "devOptional": true,
       "license": "MIT",
       "peerDependencies": {
         "@types/react": "^19.0.0"
@@ -2883,7 +2882,6 @@
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.1.3.tgz",
       "integrity": "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/debug": {
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 76a130d..b195c44 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,10 +1,8 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
-import React, { useEffect, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { BrowserRouter as Router, Route, Routes, Navigate } from 'react-router-dom'
 
-import TagDetailSidebar from '@/components/TagDetailSidebar'
-import TagSidebar from '@/components/TagSidebar'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
 import { API_BASE_URL } from '@/config'
@@ -21,7 +19,7 @@ import WikiHistoryPage from '@/pages/wiki/WikiHistoryPage'
 import WikiNewPage from '@/pages/wiki/WikiNewPage'
 import WikiSearchPage from '@/pages/wiki/WikiSearchPage'
 
-import type { Post, Tag, User } from '@/types'
+import type { User } from '@/types'
 
 
 export default () => {
@@ -29,11 +27,12 @@ export default () => {
 
   useEffect (() => {
     const createUser = async () => {
-      const { data } = await axios.post (`${ API_BASE_URL }/users`)
+      const res = await axios.post (`${ API_BASE_URL }/users`)
+      const data = res.data as { code: string; user: any }
       if (data.code)
 	{
 	  localStorage.setItem ('user_code', data.code)
-	  setUser (toCamel (data.user, { deep: true }))
+	  setUser (toCamel (data.user, { deep: true }) as User)
 	}
     }
 
@@ -41,7 +40,8 @@ export default () => {
     if (code)
       {
 	void (async () => {
-	  const { data } = await axios.post (`${ API_BASE_URL }/users/verify`, { code })
+	  const res = await axios.post (`${ API_BASE_URL }/users/verify`, { code })
+	  const data = res.data as { valid: boolean, user: any }
 	  if (data.valid)
 	    setUser (toCamel (data.user, { deep: true }))
 	  else
diff --git a/frontend/src/components/NicoViewer.tsx b/frontend/src/components/NicoViewer.tsx
index 8636c53..ac4caec 100644
--- a/frontend/src/components/NicoViewer.tsx
+++ b/frontend/src/components/NicoViewer.tsx
@@ -1,8 +1,5 @@
 import React, { useRef, useLayoutEffect, useEffect, useState, CSSProperties } from 'react'
-import axios from 'axios'
 import { Link, useNavigate, useLocation } from 'react-router-dom'
-import { API_BASE_URL } from '../config'
-
 type Props = { id:      string,
                width:   number,
                height:  number,
diff --git a/frontend/src/components/TopNav.tsx b/frontend/src/components/TopNav.tsx
index 084fc63..fde9bc1 100644
--- a/frontend/src/components/TopNav.tsx
+++ b/frontend/src/components/TopNav.tsx
@@ -10,7 +10,7 @@ import { cn } from '@/lib/utils'
 
 import type { Tag, User, WikiPage } from '@/types'
 
-type Props = { user:	User
+type Props = { user:	User | null
 	       setUser: (user: User) => void }
 
 const enum Menu { None,
@@ -20,7 +20,7 @@ const enum Menu { None,
 		  Wiki }
 
 
-const TopNav: React.FC = ({ user, setUser }: Props) => {
+export default ({ user, setUser }: Props) => {
   const location = useLocation ()
   const navigate = useNavigate ()
 
@@ -230,6 +230,3 @@ const TopNav: React.FC = ({ user, setUser }: Props) => {
 	}) ()}
       </>)
 }
-
-
-export default TopNav
diff --git a/frontend/src/pages/posts/PostDetailPage.tsx b/frontend/src/pages/posts/PostDetailPage.tsx
index 02d86c7..f22d9a2 100644
--- a/frontend/src/pages/posts/PostDetailPage.tsx
+++ b/frontend/src/pages/posts/PostDetailPage.tsx
@@ -16,7 +16,7 @@ import { cn } from '@/lib/utils'
 
 import type { Post, Tag, User } from '@/types'
 
-type Props = { user: User }
+type Props = { user: User | null }
 
 
 export default ({ user }: Props) => {
diff --git a/frontend/tsconfig.app.json b/frontend/tsconfig.app.json
index c9ccbd4..726680b 100644
--- a/frontend/tsconfig.app.json
+++ b/frontend/tsconfig.app.json
@@ -21,7 +21,11 @@
     "noUnusedParameters": true,
     "erasableSyntaxOnly": true,
     "noFallthroughCasesInSwitch": true,
-    "noUncheckedSideEffectImports": true
+    "noUncheckedSideEffectImports": true,
+    "baseUrl": "./src",
+    "paths": {
+      "@/*": ["*"]
+    }
   },
   "include": ["src"]
 }