Function configureServer

playground/hmr-ssr/vite.config.ts:26–33

(server)

        }
      },
      configureServer(server) {
        server.environments.ssr.hot.on(
          'custom:remote-add',
          ({ a, b }, client) => {
            client.send('custom:remote-add-result', { result: a + b })
          },
        )
      },
    },
    virtualPlugin(),
    transformCountPlugin(),