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

React testing

In the final section of this chapter, we build a set of unit tests for our React sample application. Similar to what we have done with the other frameworks, we will verify that our initial application state is correct on startup, and then work through DOM rendering tests. Finally, we will build a set of tests that will fill in form values, and then submit the form.

Multiple entry points

Our React sample application uses Webpack as a compilation and bundling tool in order to convert our TypeScript files into usable React components. During Webpack's bundling process, we need to specify the entry point of our application, and also specify the output filename. Therefore, given an entry point of /app/index.tsx...