From ca40caaad8c341983205f781058600d4c40e40a8 Mon Sep 17 00:00:00 2001
From: Peter van Hardenberg <pvh@pvh.ca>
Date: Tue, 6 Feb 2024 07:21:38 -0800
Subject: [PATCH] don't broadcast null userIds

---
 .../automerge-repo-react-hooks/src/useLocalAwareness.ts     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/automerge-repo-react-hooks/src/useLocalAwareness.ts b/packages/automerge-repo-react-hooks/src/useLocalAwareness.ts
index 0bd3e7e55..ba1e82c34 100644
--- a/packages/automerge-repo-react-hooks/src/useLocalAwareness.ts
+++ b/packages/automerge-repo-react-hooks/src/useLocalAwareness.ts
@@ -47,6 +47,12 @@ export const useLocalAwareness = ({
   }
 
   useEffect(() => {
+    // Don't broadcast if userId isn't set: this avoids bogus broadcasts
+    // during the loading of a userId document.
+    if (!userId) {
+      return
+    }
+
     // Send periodic heartbeats
     const heartbeat = () =>
       void handle.broadcast([userId, localStateRef.current])