feat: export broadcast function from react module

[chentsulin]

Exporting the broadcast function to allow external usage of the BroadcastChannel functionality.

☕️ Reasoning

This gives us the opportunity to directly listen to the broadcasted signout event to achieve reload on other tabs, while the tab that executes signOut won't receive the event itself.

'use client';

import { broadcast, useSession } from 'next-auth/react';
import { useEffect } from 'react';

interface NextAuthBroadcastMessage {
  event: string;
  data?: {
    trigger?: string;
  };
}

export function SignOutListener() {
  const { data: session } = useSession();

  useEffect(() => {
    const channel = broadcast();

    const handler = (message: MessageEvent<NextAuthBroadcastMessage>) => {
      const { event, data } = message.data;

      // message format: { event: "session", data: { trigger: "signout" } }
      if (session && event === 'session' && data?.trigger === 'signout') {
        window.location.reload();
      }
    };

    channel.addEventListener('message', handler);

    return () => {
      channel.removeEventListener('message', handler);
    };
  }, [session]);

  return null;
}

🧢 Checklist

• Ready to be merged

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
auth-docs	Ready	Preview, Comment	Feb 4, 2026 4:29am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
next-auth-docs	Ignored	Preview	Feb 4, 2026 4:29am

[vercel]

@chentsulin is attempting to deploy a commit to the authjs Team on Vercel.

A member of the Team first needs to authorize it.