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Initialize dark mode from system theme #429

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Initialize dark mode from system theme #429

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20 changes: 15 additions & 5 deletions hooks/useDarkMode.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,15 +6,25 @@ export function useDarkMode() {
const [isDarkMode, setIsDarkMode] = useState<boolean>(false);

const toggleDarkMode = () => {
setIsDarkMode(prev => !prev);
/** Persist in local storage */
localStorage.setItem(STORAGE_KEY, JSON.stringify(!isDarkMode));
const next = !isDarkMode;
setIsDarkMode(next);
localStorage.setItem(STORAGE_KEY, JSON.stringify(next));
};

useEffect(() => {
/** Use persisted local storage value if present */
setIsDarkMode(JSON.parse(localStorage.getItem(STORAGE_KEY) || "false"));
/** Retrieve saved preference or use system setting */
const saved = localStorage.getItem(STORAGE_KEY);
const dark =
saved !== null
? JSON.parse(saved)
: (window.matchMedia &&
window.matchMedia('(prefers-color-scheme: dark)').matches) ||
false;

setIsDarkMode(dark);
localStorage.setItem(STORAGE_KEY, JSON.stringify(dark));
}, []);


return { isDarkMode, toggleDarkMode };
}