loginFlow.js

function LoginFlow() {
  
  this.loginPage = new LoginPage(driver);  // another question is how to provide the driver, global or parameter?
  
  function login(username, password){
    loginPage.userName.text = username;
    loginPage.password.text = password;
    loginPage.loginButton.click();
    dalek.waitFor(window.document.title == 'Home');  // ideally wouldn't want to have to use dalek, driver would be better
  }
}

loginPage.js

function LoginPage(driver) {
  this.userName =  driver.getElement('#userName');
  this.password = driver.getElement("#password");
  this.loginButton = driver.getElement("#loginButton");
};

loginTest.js

var loginPage = require('./loginPage.js');
var loginFlow = require('./loginFlow.js');

module.exports = {
'Login displays': function (test) {
  test
    .open('http://www.mytest.site/login')
    .chain()
      .assert.
      .assert.exists(loginPage.userName);
      .assert.exists(loginPage.password);
      .assert.exists(loginPage.loginButton);
    .done();
}

'Able to login': function (test) {
  loginFlow.login();
  test.assertTitle('My Account')
}
};

I have the absolute minimum experience with require so not sure how best to provide the driver to the login page.