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)

Internal modules (module and namespace)

We can use the module and namespace keywords to define internal modules. TypeScript originally allowed us to use the module keyword to declare internal modules, but it was later deprecated in favor of the namespace keyword.

Internal modules (namespaces) can be used to encapsulate certain elements of an application and to provide our code with a better organization. However, we should try to avoid them and favor external modules over namespaces. External modules should be our preferred option because they are required by some tools that allow us to optimize certain aspects of our application. External modules will be covered in detail later in this chapter.

We can use namespaces to group interfaces, classes, and objects that are somehow related. For example, we could wrap all our application models inside an internal module named Models: