umami/hooks/useTheme.js

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import { useEffect } from 'react';
import useStore, { setTheme } from 'store/app';
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import { getItem, setItem } from 'next-basics';
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import { THEME_CONFIG } from 'lib/constants';
const selector = state => state.theme;
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export default function useTheme() {
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const defaultTheme =
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typeof window !== 'undefined'
? window?.matchMedia('(prefers-color-scheme: dark)')?.matches
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? 'dark'
: 'light'
: 'light';
const theme = useStore(selector) || getItem(THEME_CONFIG) || defaultTheme;
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function saveTheme(value) {
setItem(THEME_CONFIG, value);
setTheme(value);
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}
useEffect(() => {
document.body.setAttribute('data-theme', theme);
}, [theme]);
useEffect(() => {
const url = new URL(window.location.href);
const theme = url.searchParams.get('theme');
if (['light', 'dark'].includes(theme)) {
saveTheme(theme);
}
}, []);
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return [theme, saveTheme];
}