@fastify/websocket v8 passes Duplex stream as first arg, not ws.WebSocket directly.
socket.on('message') never fired because Duplex streams don't emit 'message' events.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@fastify/websocket v8 passes Duplex stream as first arg, not ws.WebSocket directly.
socket.on('message') never fired because Duplex streams don't emit 'message' events.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>