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Fix: Theme switching flash using script injection #19

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Fix: Theme switching flash using script injection #19

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3 changes: 3 additions & 0 deletions .Jules/palette.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
## 2025-05-24 - Theme Script Injection
**Learning:** Next.js App Router (React 19) requires `suppressHydrationWarning` on `html` when using script injection for theme toggling to avoid hydration mismatches.
**Action:** Always include both the blocking script in `<head>` and the prop on `<html>` for seamless dark mode implementation.
21 changes: 20 additions & 1 deletion app/layout.tsx
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Expand Up @@ -14,8 +14,27 @@ export default function RootLayout({
children: React.ReactNode;
}>) {
return (
<html lang="en">
<html lang="en" suppressHydrationWarning>
<head>
<script
dangerouslySetInnerHTML={{
__html: `
(function() {
try {
var stored = localStorage.getItem('theme');
var isDark = stored === 'dark' || (!stored && window.matchMedia('(prefers-color-scheme: dark)').matches);
var root = document.documentElement;
root.classList.remove('light', 'dark');
if (isDark) {
root.classList.add('dark');
} else {
root.classList.add('light');
}
} catch (e) {}
})();
`,
}}
/>
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossOrigin="anonymous" />
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap" rel="stylesheet" />
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