🧹 [code health] Refactor useCardSettings to remove redundant effect and eslint-disable#376
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…dSettings Co-authored-by: is0692vs <135803462+is0692vs@users.noreply.github.com>
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Code Review
This pull request simplifies the useCardSettings hook by removing the isHydrated state and its associated initialization effect. However, this change introduces a critical bug where user settings in localStorage are overwritten with default values upon mounting because the hydration guard was removed. It is recommended to restore the hydration check to prevent data loss.
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| const [layout, setLayout] = useState<CardLayout>(() => loadCardSettings().layout); | ||
| const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>( | ||
| () => loadCardSettings().options, | ||
| ); | ||
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| // Initialize state from storage on mount | ||
| useEffect(() => { | ||
| if (!mounted || isHydrated) { | ||
| return; | ||
| } | ||
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| const { layout: storedLayout, options: storedOptions } = loadCardSettings(); | ||
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| // eslint-disable-next-line react-hooks/set-state-in-effect | ||
| setLayout((prev) => JSON.stringify(prev) !== JSON.stringify(storedLayout) ? storedLayout : prev); | ||
| // eslint-disable-next-line react-hooks/set-state-in-effect | ||
| setDisplayOptions((prev) => JSON.stringify(prev) !== JSON.stringify(storedOptions) ? storedOptions : prev); | ||
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| setIsHydrated(true); | ||
| }, [mounted, isHydrated]); | ||
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| // Persist changes to storage | ||
| useEffect(() => { | ||
| if (!mounted || !isHydrated) { | ||
| if (!mounted) { | ||
| return; | ||
| } | ||
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| saveCardSettings(layout, displayOptions); | ||
| }, [layout, displayOptions, mounted, isHydrated]); | ||
| }, [layout, displayOptions, mounted]); |
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🚨 Critical Bug: User settings will be wiped out on every page load (SSR/Hydration issue)
While removing the isHydrated state and the useEffect seems like a clean refactoring, it introduces a critical bug that completely overwrites and wipes out the user's saved settings in localStorage with the default settings on every page load.
Why this happens:
- Rules of Hooks: In any parent component (like
CardGeneratorModal), hooks must be called at the top level, before any early returns (such asif (!mounted) return null;). - Server-Side Rendering (SSR): During SSR,
mountedisfalse.useCardSettings(false)is executed on the server. Sincewindowis undefined,loadCardSettings()returns the default settings, and the state (layoutanddisplayOptions) is initialized to these defaults. - Client-Side Hydration: During hydration,
mountedis stillfalse. The state remains initialized to the default values. - Mounting: Once the component mounts,
mountedbecomestrue. - The Bug: The persistence
useEffecttriggers becausemountedchanged totrue. Since theisHydratedguard was removed, the effect immediately callssaveCardSettings(layout, displayOptions)using the current state values—which are the default values! - Data Loss: This immediately overwrites the user's custom settings in
localStoragewith the defaults.
Solution:
To prevent this, we must keep the isHydrated guard (or a similar mechanism) to ensure we never write to localStorage until we have successfully loaded the stored settings on the client side after mounting.
const [layout, setLayout] = useState<CardLayout>(() => loadCardSettings().layout);
const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>(
() => loadCardSettings().options,
);
const [isHydrated, setIsHydrated] = useState(false);
// Initialize state from storage on mount
useEffect(() => {
if (!mounted || isHydrated) {
return;
}
const { layout: storedLayout, options: storedOptions } = loadCardSettings();
setLayout(storedLayout);
setDisplayOptions(storedOptions);
setIsHydrated(true);
}, [mounted, isHydrated]);
// Persist changes to storage
useEffect(() => {
if (!mounted || !isHydrated) {
return;
}
saveCardSettings(layout, displayOptions);
}, [layout, displayOptions, mounted, isHydrated]);
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| const [layout, setLayout] = useState<CardLayout>(() => loadCardSettings().layout); | ||
| const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>( | ||
| () => loadCardSettings().options, | ||
| ); |
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loadCardSettings() が2つの useState 遅延初期化で個別に呼ばれており、localStorage への読み取りが2回発生します。1回の呼び出しに統一することで、I/Oを減らしつつコードの意図も明確になります。
| const [layout, setLayout] = useState<CardLayout>(() => loadCardSettings().layout); | |
| const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>( | |
| () => loadCardSettings().options, | |
| ); | |
| const [layout, setLayout] = useState<CardLayout>(() => { | |
| const { layout } = loadCardSettings(); | |
| return layout; | |
| }); | |
| const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>(() => { | |
| const { options } = loadCardSettings(); | |
| return options; | |
| }); |
Prompt To Fix With AI
This is a comment left during a code review.
Path: src/hooks/useCardSettings.ts
Line: 13-16
Comment:
`loadCardSettings()` が2つの `useState` 遅延初期化で個別に呼ばれており、localStorage への読み取りが2回発生します。1回の呼び出しに統一することで、I/Oを減らしつつコードの意図も明確になります。
```suggestion
const [layout, setLayout] = useState<CardLayout>(() => {
const { layout } = loadCardSettings();
return layout;
});
const [displayOptions, setDisplayOptions] = useState<CardDisplayOptions>(() => {
const { options } = loadCardSettings();
return options;
});
```
How can I resolve this? If you propose a fix, please make it concise.Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
1 participant
🎯 What: Removed the
isHydratedstate, the redundantuseEffectthat was updating state from local storage on mount, and the associatedeslint-disable react-hooks/set-state-in-effectcomments insrc/hooks/useCardSettings.ts.💡 Why: Setting state synchronously inside an effect is discouraged in React as it causes cascading renders. Since this hook is only consumed by
CardGeneratorModal(which handles hydration safety by returningnullwhen not mounted), it is perfectly safe to lazily initialize theuseStatedirectly from local storage usingloadCardSettings(). This cleans up the code, removes the need for ESLint disable comments, and avoids an unnecessary extra render.✅ Verification: Verified by checking the implementation logic, running
npm run lint(which successfully passed without any custom disable rules), running the complete Vitest test suite (npm run test), and performing a production build (npm run build). All tests passed, and no new issues were introduced.✨ Result: Improved readability and adherence to React best practices by removing the redundant hydration state synchronization effect and suppressing directives.
PR created automatically by Jules for task 1774850177054424438 started by @is0692vs
Greptile Summary
このPRは
useCardSettingsフックからisHydratedステートと初期化用useEffect、および関連するeslint-disableコメントを削除し、useStateの遅延初期化（lazy initializer）に一本化したリファクタリングです。loadCardSettings()を lazy initializer として直接利用することで、エフェクト経由の二重ロードを排除し、不要な再レンダーを回避しています。CardGeneratorModalが!mounted時にnullを返すため、SSR/ハイドレーションの不整合リスクはなく、変更は安全です。Confidence Score: 4/5
マージしても安全な変更です。ロジックの正確性は担保されており、SSR/ハイドレーション上の懸念もありません。
削除されたエフェクトは lazy initializer で完全に代替でき、loadCardSettings() の window チェックにより SSR でも安全に動作します。CardGeneratorModal が mounted=false 時に null を返すことで DOM の不整合も発生しません。唯一の指摘は loadCardSettings() を2回呼んでいる軽微なスタイル上の問題のみです。
特に注意が必要なファイルはありません。
Important Files Changed
Sequence Diagram
sequenceDiagram participant Browser participant CardGeneratorModal participant useCardSettings participant localStorage Browser->>CardGeneratorModal: "初回レンダー (mounted=false)" CardGeneratorModal->>useCardSettings: useCardSettings(false) useCardSettings->>localStorage: loadCardSettings() × 2（lazy initializer） localStorage-->>useCardSettings: layout / options CardGeneratorModal-->>Browser: return null（マウント待ち） Note over Browser: setTimeout(0) 完了 Browser->>CardGeneratorModal: "再レンダー (mounted=true)" CardGeneratorModal->>useCardSettings: useCardSettings(true) useCardSettings->>localStorage: saveCardSettings(layout, options)（persist effect） CardGeneratorModal-->>Browser: モーダル UI を描画Prompt To Fix All With AI
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