sudo: requireddist: trustylanguage: node_jsnode_js:- 6- 5- 4cache:directories:- node_modulesaddons:apt:sources:- ubuntu-toolchain-r-testpackages:- g++-4.8packages:- xvfbinstall:- export CXX="g++-4.8"- npm install- "/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1280x1024x16"- export DISPLAY=':99.0'- Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &- sudo apt-get install --no-install-recommends -y icnsutils graphicsmagick xz-utils xorrisobefore_script:- export DISPLAY=:99.0- sh -e /etc/init.d/xvfb start &- sleep 3script:- npm run lint