If it's not working when you connect with your Macbook, you could look in the 'Chrome dev console' and see if any errors are reported. Typing Puck.debug=3 in the dev console before you connect will show you all communications between the Puck and the Mac
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
If it's not working when you connect with your Macbook, you could look in the 'Chrome dev console' and see if any errors are reported. Typing
Puck.debug=3
in the dev console before you connect will show you all communications between the Puck and the Mac