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 compiler

The TypeScript compiler is called tsc and is responsible for transpiling the TypeScript code to JavaScript. The TypeScript compiler is also cross-platform and supported on Windows, macOS, and Linux.

To run the TypeScript compiler, there are a couple of options. One is to integrate the compiler in your editor of choice, which we explained in the previous section. In the previous section, we also integrated the TypeScript compiler with VS Code, which allowed us to build our code from the editor itself. All the compiler configurations that we would want to use are added to the tsconfig.json file.

Another option is to use tsc directly from the command line / Terminal window. TypeScript's tsc command takes compiler configuration options as parameters and compiles code into JavaScript. For example, create a simple TypeScript file in Notepad and add the following...