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Fix hydration mismatches by moving localStorage reads to useEffect #139

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Merged
jamespepper81 merged 4 commits into from
Nov 19, 2025
Merged

Fix hydration mismatches by moving localStorage reads to useEffect #139

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1c7b636
Merge pull request #137 from BitSleuthAI/dev
jamespepper81 Nov 19, 2025
28eafd5
Initial plan
Copilot Nov 19, 2025
68368f0
Fix hydration issues in layout.tsx
Copilot Nov 19, 2025
960bf69
Merge pull request #138 from BitSleuthAI/copilot/fix-hydration-mismat…
jamespepper81 Nov 19, 2025
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2 changes: 2 additions & 0 deletions eslint.config.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@ const eslintConfig = [
"react/no-unescaped-entities": "off",
// Allow Math.random() in useMemo - intentionally memoized for client-side randomization
"react-hooks/purity": "off",
// Allow setState in useEffect for legitimate hydration patterns
"react-hooks/set-state-in-effect": "off",
// Unused vars as warnings instead of errors
"@typescript-eslint/no-unused-vars": ["warn", {
"argsIgnorePattern": "^_",
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15 changes: 7 additions & 8 deletions src/app/layout.tsx
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Expand Up @@ -25,29 +25,28 @@ export default function RootLayout({
children: React.ReactNode;
}>) {
const [isClient, setIsClient] = useState(false)
const [analyticsAllowed] = useState(() => {
// Initialize from localStorage on mount (only runs once)
if (typeof window === 'undefined') return false;
const [analyticsAllowed, setAnalyticsAllowed] = useState(false);

useEffect(() => {
// Read cookie consent from localStorage after component mounts
try {
const consent = localStorage.getItem('cookie_consent');
if (consent) {
const parsedConsent = JSON.parse(consent);
return parsedConsent.analytics === true;
setAnalyticsAllowed(parsedConsent.analytics === true);
}
} catch (e) {
console.error("Error parsing cookie consent:", e);
}
return false;
});
}, []);

useEffect(() => {
// This is a legitimate hydration pattern - set client flag after mount
// eslint-disable-next-line react-hooks/set-state-in-effect
setIsClient(true)
}, [])

return (
<html lang="en" suppressHydrationWarning className="!scroll-smooth">
<html lang="en" className="!scroll-smooth">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, maximum-scale=5, user-scalable=yes" />
<meta name="mobile-web-app-capable" content="yes" />
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