Luke The Dev
58 lines
1.6 KiB
TypeScript
58 lines
1.6 KiB
TypeScript
"use client";
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import { useEffect, useState } from "react";
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import { Moon, Sun } from "lucide-react";
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const THEME_STORAGE_KEY = "theme";
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type ThemeMode = "light" | "dark";
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const getPreferredTheme = (): ThemeMode => {
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if (typeof window === "undefined") return "light";
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const stored = window.localStorage.getItem(THEME_STORAGE_KEY);
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if (stored === "light" || stored === "dark") return stored;
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const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
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return prefersDark ? "dark" : "light";
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};
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const applyTheme = (mode: ThemeMode) => {
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if (typeof document === "undefined") return;
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document.documentElement.classList.toggle("dark", mode === "dark");
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};
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export const ThemeToggle = () => {
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// Keep SSR + initial hydration stable ("light") to avoid markup mismatch.
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const [theme, setTheme] = useState<ThemeMode>("light");
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useEffect(() => {
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const preferred = getPreferredTheme();
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// eslint-disable-next-line react-hooks/set-state-in-effect
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setTheme(preferred);
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applyTheme(preferred);
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}, []);
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const toggleTheme = () => {
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setTheme((current) => {
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const next: ThemeMode = current === "dark" ? "light" : "dark";
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if (typeof window !== "undefined") {
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window.localStorage.setItem(THEME_STORAGE_KEY, next);
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}
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applyTheme(next);
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return next;
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});
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};
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const isDark = theme === "dark";
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return (
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<button
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type="button"
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onClick={toggleTheme}
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aria-label={isDark ? "Switch to light mode" : "Switch to dark mode"}
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className="ui-btn-icon ui-btn-icon-xs"
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>
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{isDark ? <Sun className="h-3 w-3" /> : <Moon className="h-3 w-3" />}
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</button>
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);
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};
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