Hi all,
if you are doing Moodle Mobile development please notice that the latest version of the code published in our github repository requires Node 6 to work.
You can check the upgrade.txt file for instructions to update here: https://github.com/moodlehq/moodlemobile2/blob/master/upgrade.txt
Here is the complete guide for setting up the development environment for MM2
https://docs.moodle.org/dev/Setting_up_your_development_environment_for_Moodle_Mobile_2
Juan