Type Alias ServerToClientMessage

ServerToClientMessage:
    | { body: { payload: string; topic: string }; type: "app" }
    | { type: "pong" }
    | {
        body: { error: { code: string; message: string }; topic: string };
        type: "system:subscribe:error";
    }
    | { body: { message: string }; type: "system:rebalance" }