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50 lines
1.7 KiB
TypeScript
50 lines
1.7 KiB
TypeScript
/**
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* ThemeScript - Initializes theme from localStorage before React hydration
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* This prevents the flash of wrong theme on page load.
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*
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* Must be a Server Component: in Next.js / React 19, <script> tags rendered
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* by Client Components are inert on the client. Rendering it from the server
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* inlines the snippet into the SSR HTML so the browser executes it before
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* hydration.
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*/
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export default function ThemeScript() {
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const themeScript = `
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(function() {
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try {
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const stored = localStorage.getItem('deeptutor-theme');
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document.documentElement.classList.remove('dark', 'theme-glass', 'theme-snow');
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if (stored === 'dark') {
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document.documentElement.classList.add('dark');
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} else if (stored === 'glass') {
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document.documentElement.classList.add('dark', 'theme-glass');
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} else if (stored === 'snow') {
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document.documentElement.classList.add('theme-snow');
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} else if (stored === 'light') {
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// already clean
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} else {
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// No stored preference: Default (snow) for light systems,
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// Dark for prefers-color-scheme: dark.
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if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
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document.documentElement.classList.add('dark');
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localStorage.setItem('deeptutor-theme', 'dark');
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} else {
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document.documentElement.classList.add('theme-snow');
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localStorage.setItem('deeptutor-theme', 'snow');
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}
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}
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} catch (e) {
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/* localStorage may be disabled */
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}
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})();
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`;
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return (
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<script
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dangerouslySetInnerHTML={{ __html: themeScript }}
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suppressHydrationWarning
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/>
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);
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}
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