Book Image

Mastering TypeScript 3 - Third Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript 3 - Third Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript. It was designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Starting with an introduction to the TypeScript language, before moving on to basic concepts, each section builds on previous knowledge in an incremental and easy-to-understand way. Advanced and powerful language features are all covered, including asynchronous programming techniques, decorators, and generics. This book explores many modern JavaScript and TypeScript frameworks side by side in order for the reader to learn their respective strengths and weaknesses. It will also thoroughly explore unit and integration testing for each framework. Best-of-breed applications utilize well-known design patterns in order to be scalable, maintainable, and testable. This book explores some of these object-oriented techniques and patterns, and shows real-world implementations. By the end of the book, you will have built a comprehensive, end-to-end web application to show how TypeScript language features, design patterns, and industry best practices can be brought together in a real-world scenario.
Table of Contents (16 chapters)
Free Chapter
TypeScript Tools and Framework Options


In this chapter, we covered a fair bit of ground. We took an in-depth look at how to unit test each of our TypeScript compatible frameworks. All of the test frameworks we used allowed us to create components within a test DOM designed for the component under test. We were able to query DOM elements, ensure that they were initialized correctly, and simulated a user entering values into a form, and clicking on the Submit button. All of our frameworks provided a similar set of functionality, except for Aurelia, which did not allow us to test DOM events, such as button clicks.

unit-testing is really a mindset. Some developers, and indeed some development teams, are able to think about components from a testability point of view, writing unit tests as they are developing components. Some developers prefer to build an entire component first, and then build a set of unit tests...