vercel-labs__json-render/examples/chat/components/theme-toggle.tsx

"use client";

import { useTheme } from "next-themes";
import { useEffect, useState } from "react";
import { Moon, Sun } from "lucide-react";

export function ThemeToggle() {
  const { theme, setTheme } = useTheme();
  const [mounted, setMounted] = useState(false);

  useEffect(() => {
    setMounted(true);
  }, []);

  if (!mounted) {
    return (
      <button className="p-2 rounded-md border border-border bg-card">
        <Sun className="h-4 w-4" />
      </button>
    );
  }

  return (
    <button
      onClick={() => setTheme(theme === "dark" ? "light" : "dark")}
      className="p-2 rounded-md border border-border bg-card hover:bg-accent transition-colors"
      aria-label="Toggle theme"
    >
      {theme === "dark" ? (
        <Sun className="h-4 w-4" />
      ) : (
        <Moon className="h-4 w-4" />
      )}
    </button>
  );
}