Selenium Javascript web-driver API with promises

JustLogin.js

var webdriver = require('selenium-webdriver'),
    By = webdriver.By,
    until = webdriver.until,
    logging = webdriver.logging;


// Selenium's promise module provides logging to report every instance of unsynchronized code running through the promise manager
logging.installConsoleHandler();
logging.getLogger('promise.ControlFlow').setLevel(logging.Level.ALL);


new webdriver.Builder()
    .forBrowser('chrome')
    .build()
    .then(driver => createInitialState(config, driver))
    .then(state => state.transitions.openStartPage())
    .then(state => maximizeWindow(state))
    .then(state => takeScreenshot(state))
    .then(state => state.transitions.login())
    .then(state => takeScreenshot(state))
    .then(state => state.driver.quit());