cloudflare/partykit partyserver@0.5.5

partyserver@0.5.5

Repository: cloudflare/partykit

Tag: partyserver@0.5.5

Published: 2026-04-28T18:45:26Z

Prerelease: no

Release notes:

Patch Changes

• #394 `9a927a3` Thanks @threepointone! - Don't reciprocate the WebSocket close handshake when the runtime delivers a reserved close code (1005, 1006, 1015). These codes are synthesized by the runtime when the peer didn't actually send a Close frame — there is no handshake to complete. The earlier 0.5.4 change ([#393](https://github.com/cloudflare/partykit/issues/393)) normalized these to 1000 and tried to send a reciprocating Close frame anyway; in cross-isolate transports (notably WebSocket pairs that flow back through Durable Object RPC, e.g. Cloudflare Agents sub-agents) the reciprocation would succeed synchronously but schedule an outbound write on a transport whose peer was already gone. The runtime then rejected that write asynchronously with Network connection lost, escaping closeQuietly's synchronous try/catch and surfacing as an unhandled promise rejection in tests and production logs. The fix is to skip the reciprocation for reserved codes — there's nothing to acknowledge to a peer that didn't speak. The narrow user-visible behavior change: a client that calls ws.close() with no code on compat dates < 2026-04-07 (no auto-reply) will now observe a non-clean close instead of a clean 1000 close, because the framework no longer fabricates a reciprocation. Clients that pass an explicit close code are unaffected.