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Fix cross-window Yjs sync: broadcast doc updates to all connections

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The Vite Yjs plugin was only sending sync responses back to the
sender, not broadcasting updates to other WebSocket connections
in the same room. This caused cross-window sync to only work via
BroadcastChannel (same browser context), not across separate
browser windows/incognito.

Fix: Add doc.on('update') listener that broadcasts updates to all
connections in the room except the origin sender.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-03-23 07:30:00 +01:00
parent 55806fc84a
commit 288e9c07f2
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1 changed files with 15 additions and 0 deletions
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15
apps/planner/app/lib/vite-yjs-plugin.ts
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@ -28,6 +28,21 @@ export function yjsDevPlugin(): Plugin {
awareness = new awarenessProtocol.Awareness(doc);
awarenessMap.set(docName, awareness);
// Broadcast doc updates to all connections in this room
doc.on("update", (update: Uint8Array, origin: unknown) => {
const encoder = encoding.createEncoder();
encoding.writeVarUint(encoder, messageSync);
syncProtocol.writeUpdate(encoder, update);
const message = encoding.toUint8Array(encoder);
for (const [ws, meta] of conns) {
// Don't send back to the origin connection
if (meta.docName === docName && ws !== origin && ws.readyState === ws.OPEN) {
ws.send(message);
}
}
});
awareness.on("update", ({ added, updated, removed }: { added: number[]; updated: number[]; removed: number[] }) => {
const changedClients = added.concat(updated, removed);
const encoder = encoding.createEncoder();