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Default to dark mode #43

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Merged
duckyquang merged 1 commit into from
Jul 16, 2026
Merged

Default to dark mode #43

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24 changes: 2 additions & 22 deletions frontend/src/lib/hooks.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -152,20 +152,13 @@ export function useStickToBottom(dep: unknown) {
export type Theme = "light" | "dark";
const THEME_KEY = "cosci_theme";

function systemTheme(): Theme {
return typeof window !== "undefined" &&
window.matchMedia?.("(prefers-color-scheme: dark)").matches
? "dark"
: "light";
}

/** Resolve the active theme: explicit user choice, else system preference. */
/** Resolve the active theme: explicit user choice, else the dark default. */
export function getTheme(): Theme {
try {
const saved = localStorage.getItem(THEME_KEY);
if (saved === "light" || saved === "dark") return saved;
} catch { /* ignore */ }
return systemTheme();
return "dark";
}

export function applyTheme(theme: Theme) {
Expand All @@ -185,19 +178,6 @@ export function useTheme(): [Theme, (t: Theme) => void] {
applyTheme(t);
try { localStorage.setItem(THEME_KEY, t); } catch { /* ignore */ }
}, []);
// Follow system changes only while the user hasn't pinned a choice.
useEffect(() => {
const mq = window.matchMedia?.("(prefers-color-scheme: dark)");
if (!mq) return;
const onChange = () => {
try { if (localStorage.getItem(THEME_KEY)) return; } catch { /* ignore */ }
const t = systemTheme();
setThemeState(t);
applyTheme(t);
};
mq.addEventListener?.("change", onChange);
return () => mq.removeEventListener?.("change", onChange);
}, []);
return [theme, setTheme];
}

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