Book Image

TypeScript 2.x By Example

By : Sachin Ohri
Book Image

TypeScript 2.x By Example

By: Sachin Ohri

Overview of this book

The TypeScript language, compiler, and open source development toolset brings JavaScript development up to the enterprise level. It allows you to use ES5, ES6, and ES7 JavaScript language features today, including classes, interfaces, generics, modules, and more. Its simple typing syntax enables building large, robust applications using object-oriented techniques and industry-standard design principles. This book aims at teaching you how to get up and running with TypeScript development in the most practical way possible. Taking you through two exciting projects built from scratch, you will learn the basics of TypeScript, before progressing to functions, generics, promises, and callbacks. Then, you’ll get to implement object-oriented programming as well as optimize your applications with effective memory management. You’ll also learn to test and secure your applications, before deploying them. Starting with a basic SPA built using Angular, you will progress on to building, maybe, a Chat application or a cool application. You’ll also learn how to use NativeScript to build a cool mobile application. Each of these applications with be explained in detail, allowing you to grasp the concepts fast. By the end of this book, you will have not only built two amazing projects but you will also have the skills necessary to take your development to the next level.
Table of Contents (11 chapters)

Code coverage using Angular CLI

We looked at testing our Angular application in Chapter 7, Testing the Trello Application, where we covered in detail how to write the unit test and how Angular CLI allows us to run and manage our test cases. We created multiple test cases in our components, services, and pipes and then, using the ng test command, were able to run the test in a separate browser.

The Angular CLI also provides some options to configure our test environment with ng test, such as a watch flag which informs the CLI that it should run the test cases automatically when there is some change in the code, or the single-run flag, which allows us to run the test cases only once and not have the test scripts running.

The single-run flag is most useful in CI scenarios where we want to validate our code and not keep running the test cases. We can also choose which browser we want...