Protractor

es6.js

"use strict";

var Page = require('../Page')
var Fragment = require('../Fragment')

class LoginPage extends Page {
    constructor() {
        super('/login');
        this.emailField = $('input.email');
        this.passwordField = $('input.password');
        this.submitButton = $('button.login');

        this.restorePasswordButton = $('button.restore');
    }

    login(username, password) {
        this.email.sendKeys(username);
        this.passwordField.sendKeys(password);
        this.submit.click();
    }

    restorePassword(email) {
        this.restorePasswordButton.click();
        new RestorePasswordModalWindow().submitEmail(email);
    }
}

class RestorePasswordModalWindow extends Fragment {
    constructor() {
        //Passing element that will be used as this.fragment;
        super($('div.modal'));
    }

    submitEmail(email) {
        //This how you can use methods from super class, just example - it is not perfect.
        this.waitUntilAppear(2000, 'Popup should appear before manipulating');
        //I love to use fragments, because they provides small and reusable parts of page.
        this.fragment.$('input.email').sendKeys(email);
        this.fragment.$('button.submit')click();
        this.waitUntilDisappear(2000, 'Popup should disappear before manipulating');
    }
}
module.exports = LoginPage;

// Page.js
class Page {
    constructor(url){
        //this will be part of page to add to base URL.
        this.url = url;
    }

    open() {
        //getting baseURL from params object in config.
        browser.get(browser.params.baseURL + this.url);
        return this; // this will allow chaining methods.
    }
}
module.exports = Page;

// Fragment.js
class Fragment {
    constructor(fragment) {
        this.fragment = fragment;
    }

    //Example of some general methods for all fragments. Notice that default method parameters will work only in node.js 6.x
    waitUntilAppear(timeout=5000, message) {
        browser.wait(this.EC.visibilityOf(this.fragment), timeout, message);
    }

    waitUntilDisappear(timeout=5000, message) {
        browser.wait(this.EC.invisibilityOf(this.fragment), timeout, message);
    }
}
module.exports = Fragment;

// Then in your test:
let loginPage = new LoginPage().open(); //chaining in action - getting LoginPage instance in return.
loginPage.restorePassword('[email protected]'); // all logic is hidden in Fragment object
loginPage.login('[email protected]')