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)

TypeScript namespace and modules

A well-organized code is one of the few important aspects of any application development, which normally does not affect your ability to churn out features but affects how fast you can make changes to your code without breaking anything. TypeScript allows us to write organized code by using features such as namespace and modules.

Before TypeScript 1.5, there was no concept of namespace; in fact, we had internal and external modules. TypeScript team in effort to align the naming convention with ECAMScript standards modified internal and external modules. Internal modules were named namespaces and external modules were named just modules, as in the case of ECMAScript 2015 (ES6). Now, with the naming conventions changed, there were changes in the syntax as well. TypeScript does have backward compatibility support, but we will keep our focus on the...