Book Image

Building Enterprise JavaScript Applications

By : Daniel Li
Book Image

Building Enterprise JavaScript Applications

By: Daniel Li

Overview of this book

With the over-abundance of tools in the JavaScript ecosystem, it's easy to feel lost. Build tools, package managers, loaders, bundlers, linters, compilers, transpilers, typecheckers - how do you make sense of it all? In this book, we will build a simple API and React application from scratch. We begin by setting up our development environment using Git, yarn, Babel, and ESLint. Then, we will use Express, Elasticsearch and JSON Web Tokens (JWTs) to build a stateless API service. For the front-end, we will use React, Redux, and Webpack. A central theme in the book is maintaining code quality. As such, we will enforce a Test-Driven Development (TDD) process using Selenium, Cucumber, Mocha, Sinon, and Istanbul. As we progress through the book, the focus will shift towards automation and infrastructure. You will learn to work with Continuous Integration (CI) servers like Jenkins, deploying services inside Docker containers, and run them on Kubernetes. By following this book, you would gain the skills needed to build robust, production-ready applications.
Table of Contents (26 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
The Importance of Good Code

Adding a user profile

If we look back at our requirements for creating a user, there's one that is still unfinished – "The user may optionally provide a profile; otherwise, an empty profile will be created for them". So, let's implement this requirement!

Writing a specification as a test

We will begin development by first writing E2E tests. In the previous chapter, we already tested a scenario where the profile is not supplied. In these new E2E tests, we will add two more scenarios where the client provides a profile object—one using an invalid profile, the other a valid one.

Therefore, we must first decide what constitutes a valid profile; in other words, what should the structure of our profile object be? There are no right or wrong answers, but for this book, we will use the following structure:

  "name": {
    "first": <string>,
    "last": <string>,
    "middle": <string>
  "summary": <string>,
  "bio": <string>

All of the fields are optional, but if...