initial

web/lib/ab.ts

@@ -0,0 +1,22 @@
+'use client';
+import { useState, useEffect } from 'react';
+
+export const useVariant = () => {
+  const [variant, setVariant] = useState<string | null>(null);
+  const [mounted, setMounted] = useState(false);
+  
+  useEffect(() => {
+    setMounted(true);
+    const u = new URL(window.location.href);
+    setVariant(u.searchParams.get('ab') ?? 'control');
+  }, []);
+  
+  return { variant: variant || 'control', mounted };
+};
+
+// Legacy function for backward compatibility
+export const variant = () => {
+  if (typeof window === 'undefined') return 'control';
+  const u = new URL(window.location.href);
+  return u.searchParams.get('ab') ?? 'control';
+};