解决 Block-scoped declarations (let, const, function, class) not yet supported outside strict mode at

https://github.com/askmike/gekko/issues/1604

由于nodejs版本过低导致的，更新nodejs版本就行。

sudo ln -sf /usr/local/n/versions/node/7.5/bin/node /usr/bin/node

sudo apt-get update
curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash –
sudo apt-get install -y nodejs