npm install --no-optional --silent

"optionalDependencies": {
    "chromedriver": "^2.35.0"
  },

$ npm la chromedriver
cdt-now@0.1.12
│ /Users/alexamil/WebstormProjects/nabisco/cdt-now
│
└── chromedriver@2.35.0
    ChromeDriver for Selenium
    git://github.com/giggio/node-chromedriver.git
    https://github.com/giggio/node-chromedriver

--production --no-shrinkwrap