Function cleanup

packages/socket.io/client-dist/socket.io.js:2269–2275

()

      }
      // Remove all listeners on the transport and on self
      var cleanup = function cleanup() {
        transport.removeListener("open", onTransportOpen);
        transport.removeListener("error", onerror);
        transport.removeListener("close", onTransportClose);
        _this8.off("close", onclose);
        _this8.off("upgrading", onupgrade);
      };
      transport.once("open", onTransportOpen);
      transport.once("error", onerror);
      transport.once("close", onTransportClose);