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fix(web): resolve hydration mismatch in dark mode toggle #80

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fix(web): resolve hydration mismatch in dark mode toggle #80

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18 changes: 9 additions & 9 deletions web/src/components/layout/header.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@ import Link from "next/link";
import { usePathname } from "next/navigation";
import { useTranslations, useLocale } from "@/lib/i18n";
import { Github, Menu, X, Sun, Moon } from "lucide-react";
import { useState } from "react";
import { useState, useEffect } from "react";
import { cn } from "@/lib/utils";

const NAV_ITEMS = [
Expand All @@ -24,14 +24,14 @@ export function Header() {
const pathname = usePathname();
const locale = useLocale();
const [mobileOpen, setMobileOpen] = useState(false);
const [dark, setDark] = useState(() => {
if (typeof window !== "undefined") {
const stored = localStorage.getItem("theme");
if (stored) return stored === "dark";
return window.matchMedia("(prefers-color-scheme: dark)").matches;
}
return false;
});
const [dark, setDark] = useState(false);

useEffect(() => {
const stored = localStorage.getItem("theme");
const isDark = stored ? stored === "dark" : window.matchMedia("(prefers-color-scheme: dark)").matches;
setDark(isDark);
document.documentElement.classList.toggle("dark", isDark);
}, []);

function toggleDark() {
const next = !dark;
Expand Down