ChromeDriver binaries, so you don't need to include it in your repository
npm install chrome-driver-standalone> Inspired by selenium-server-standalone-jar
This repository includes selenium ChromeDriver files. It points to them.
npm install --save-dev chrome-driver-standalone
This is up to you. All you get is:
var chromeDriver = require('chrome-driver-standalone');
console.log(chromeDriver.path); // path to the embeded chrome driver binary
console.log(chromeDriver.version); // X.YY.0 except for version 2.35.1