28 lines
740 B
TypeScript
28 lines
740 B
TypeScript
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import { useState, useEffect, useCallback } from 'react';
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type Theme = 'dark' | 'light';
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const STORAGE_KEY = 'snp-batch-theme';
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function getInitialTheme(): Theme {
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if (typeof window === 'undefined') return 'dark';
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const stored = localStorage.getItem(STORAGE_KEY);
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if (stored === 'light' || stored === 'dark') return stored;
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return 'dark';
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}
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export function useTheme() {
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const [theme, setTheme] = useState<Theme>(getInitialTheme);
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useEffect(() => {
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document.documentElement.setAttribute('data-theme', theme);
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localStorage.setItem(STORAGE_KEY, theme);
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}, [theme]);
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const toggle = useCallback(() => {
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setTheme((prev) => (prev === 'dark' ? 'light' : 'dark'));
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}, []);
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return { theme, toggle } as const;
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}
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