This will scan and connect to the first BLE peripheral advertising the nordic UART service (6e400001b5a3f393e0a9e50e24dcca9e).
Noble depends on bluetooth-hci-socket which (as of today) will not build on node 10. The quick fix is to npm link the patched version.
git clone -b fix-builds-for-node-10 https://github.com/jrobeson/node-bluetooth-hci-socket.git
cd node-bluetooth-hci-socket
npm link
go into nus_console folder
npm link bluetooth-hci-socket
npm install