frontend/src/App.tsx

@@ -155,7 +155,7 @@ const PostDetailRoute = ({ user }: { user: User | null }) => {
 }
 
 
-const App: FC = () => {
+const RoutedApp: FC = () => {
   const [user, setUser] = useState<User | null> (null)
   const [status, setStatus] = useState (200)
   const behaviourSettings = useClientBehaviourSettings ()
@@ -172,41 +172,6 @@ const App: FC = () => {
       ),
       [animationMode],
   )
-  const router = useMemo (
-      () => createBrowserRouter ([{
-	  path: '*',
-	  element: (
-	      <DialogueProvider>
-		<UnsavedChangesGuardProvider>
-		  <KeyboardShortcutsProvider>
-		  <MotionConfig
-		      reducedMotion={
-			  animationMode === 'normal'
-			  ? 'never'
-			  : animationMode === 'reduced'
-			    ? 'user'
-			    : 'always'
-		      }>
-		    <LayoutWrapper>
-		      <motion.div
-			  layout={animationMode === 'off' ? false : 'position'}
-			  transition={{ layout: appLayoutTransition }}
-			  className="relative flex h-dvh w-full flex-col overflow-y-hidden">
-			<TopNav user={user}/>
-			<RouteTransitionWrapper
-			    animationMode={animationMode}
-			    user={user}
-			    setUser={setUser}/>
-		      </motion.div>
-		    </LayoutWrapper>
-		  </MotionConfig>
-
-		  <Toaster/>
-		  </KeyboardShortcutsProvider>
-		</UnsavedChangesGuardProvider>
-	      </DialogueProvider>) }]),
-      [LayoutWrapper, animationMode, appLayoutTransition, setUser, user],
-  )
 
   useEffect (() => {
     applyClientAppearance ()
@@ -289,11 +254,46 @@ const App: FC = () => {
   }
 
   return (
-      <>
-	<RouteBlockerOverlay/>
-	{import.meta.env.DEV && <DevModeWatermark/>}
-	<RouterProvider router={router}/>
-      </>)
+      <DialogueProvider>
+	<UnsavedChangesGuardProvider>
+	  <KeyboardShortcutsProvider>
+	  <MotionConfig
+	      reducedMotion={
+		  animationMode === 'normal'
+		  ? 'never'
+		  : animationMode === 'reduced'
+		    ? 'user'
+		    : 'always'
+	      }>
+	    <LayoutWrapper>
+	      <motion.div
+		  layout={animationMode === 'off' ? false : 'position'}
+		  transition={{ layout: appLayoutTransition }}
+		  className="relative flex h-dvh w-full flex-col overflow-y-hidden">
+		<TopNav user={user}/>
+		<RouteTransitionWrapper
+		    animationMode={animationMode}
+		    user={user}
+		    setUser={setUser}/>
+	      </motion.div>
+	    </LayoutWrapper>
+	  </MotionConfig>
+
+	  <Toaster/>
+	  </KeyboardShortcutsProvider>
+	</UnsavedChangesGuardProvider>
+      </DialogueProvider>)
 }
 
+const router = createBrowserRouter ([{
+    path: '*',
+    element: <RoutedApp/> }])
+
+const App: FC = () => (
+    <>
+      <RouteBlockerOverlay/>
+      {import.meta.env.DEV && <DevModeWatermark/>}
+      <RouterProvider router={router}/>
+    </>)
+
 export default App

frontend/src/lib/useUnsavedChangesGuard.tsx

@@ -7,7 +7,7 @@ import {
     useRef,
     useState,
 } from 'react'
-import { useBlocker, useLocation } from 'react-router-dom'
+import { useBlocker } from 'react-router-dom'
 
 import { useDialogue } from '@/lib/dialogues/useDialogue'
 
@@ -34,7 +34,6 @@ const UnsavedChangesGuardContext =
 
 export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children }) => {
   const dialogue = useDialogue ()
-  const location = useLocation ()
   const sourcesRef = useRef (new Map<symbol, UnsavedChangesSource> ())
   const bypassNextNavigationRef = useRef (false)
   const [revision, setRevision] = useState (0)
@@ -68,12 +67,19 @@ export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children })
       [sources],
   )
   const hasUnsavedChanges = dirtySources.length > 0
-  const blocker = useBlocker (
-      useCallback (
-          () => hasUnsavedChanges && !(bypassNextNavigationRef.current),
-          [hasUnsavedChanges],
-      ),
-  )
+  const shouldBlock = useCallback (() => {
+    if (!(hasUnsavedChanges))
+      return false
+
+    if (bypassNextNavigationRef.current)
+      {
+        bypassNextNavigationRef.current = false
+        return false
+      }
+
+    return true
+  }, [hasUnsavedChanges])
+  const blocker = useBlocker (shouldBlock)
 
   const discardDirtyChanges = useCallback (async (): Promise<boolean> => {
     if (!(hasUnsavedChanges))
@@ -93,8 +99,6 @@ export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children })
       if (!(confirmed))
         return false
 
-      bypassNextNavigationRef.current = true
-
       try
       {
         for (const source of dirtySources)
@@ -102,7 +106,6 @@ export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children })
       }
       catch
       {
-        bypassNextNavigationRef.current = false
         return false
       }
 
@@ -139,10 +142,6 @@ export const UnsavedChangesGuardProvider: FC<PropsWithChildren> = ({ children })
     }
   }, [blocker, discardDirtyChanges])
 
-  useEffect (() => {
-    bypassNextNavigationRef.current = false
-  }, [location.hash, location.pathname, location.search])
-
   useEffect (() => {
     if (!(hasUnsavedChanges))
       return
@@ -183,14 +182,16 @@ export const useUnsavedChangesGuard = (
   if (context == null)
     throw new Error ('UnsavedChangesGuardProvider が必要です．')
 
+  const { registerUnsavedChangesSource } = context
+
   useEffect (() => {
     if (options == null)
       return
 
-    return context.registerUnsavedChangesSource ({
+    return registerUnsavedChangesSource ({
         dirty: options.dirty,
         discard: options.onDiscard ?? (() => undefined) })
-  }, [context, options?.dirty, options?.onDiscard])
+  }, [options?.dirty, options?.onDiscard, registerUnsavedChangesSource])
 
   return context
 }