+ * Install NodeJS 6.x (actual LTS): [https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions)
+ * Install yarn: [https://yarnpkg.com/en/docs/install](https://yarnpkg.com/en/docs/install)