Book Image

Learning TypeScript 2.x - Second Edition

By : Remo H. Jansen
Book Image

Learning TypeScript 2.x - Second Edition

By: Remo H. Jansen

Overview of this book

TypeScript is an open source and cross-platform statically typed superset of JavaScript that compiles to plain JavaScript and runs in any browser or host. This book is a step-by-step guide that will take you through the use and benefits of TypeScript with the help of practical examples. You will start off by understanding the basics as well as the new features of TypeScript 2.x. Then, you will learn how to work with functions and asynchronous programming APIs. You will continue by learning how to resolve runtime issues and how to implement TypeScript applications using the Object-oriented programming (OOP) and functional programming (FP) paradigms. Later, you will automate your development workflow with the help of tools such as Webpack. Towards the end of this book, you will delve into some real-world scenarios by implementing some full-stack TypeScript applications with Node.js, React and Angular as well as how to optimize and test them. Finally, you will be introduced to the internal APIs of the TypeScript compiler, and you will learn how to create custom code analysis tools.
Table of Contents (17 chapters)

Summary

In this chapter, we learned how to consume and implement the four available types of decorators (class, method, property, and parameter). We used decorators to mutate the original classes to understand how they work but we also learned that we should avoid using decorators to mutate the prototype of a class. We also learned how to create a decorator factory to abstract developers from the decorator types when they are consumed, how to pass configuration to a decorator, and how to use the reflection metadata API to access type information at runtime. As we have already mentioned, decorators in TypeScript are still an experimental feature, which doesn't mean that they are not ready for their usage in production systems but that their public API might be subject to breaking changes in the future. Please note that the future TypeScript releases will document how to get...