feat: demo

demo/nextjs/components/theme-toggle.tsx

@@ -0,0 +1,23 @@
+"use client";
+
+import * as React from "react";
+import { Moon, Sun } from "lucide-react";
+import { useTheme } from "next-themes";
+
+import { Button } from "@/components/ui/button";
+
+export function ThemeToggle() {
+  const { setTheme, theme } = useTheme();
+
+  return (
+    <Button
+      variant="ghost"
+      size="icon"
+      onClick={() => setTheme(theme === "light" ? "dark" : "light")}
+    >
+      <Sun className="h-[1.5rem] w-[1.3rem] dark:hidden" color="#000" />
+      <Moon className="hidden h-5 w-5 dark:block" />
+      <span className="sr-only">Toggle theme</span>
+    </Button>
+  );
+}