A breaking change has been added to @fastify/websockets@10 (fastify/fastify-websocket#289). It breaks the fastify integration.

The wsHandler first parameter type is now WebSocket rather than a NodeJS stream.
To create a stream from it an explicit call to ws.createWebSocketStream(socket) is required.

A dirty patch to make it work with the new version:

    wsHandler: (socket, req) => {
      const connection = ws.createWebSocketStream(socket);
      connection.socket = socket;
      return wsHandler.call(_app, connection, req);
    }

I'm concerned about how to properly propagate errors for the newly created stream.