Book Image

Mastering TypeScript - Fourth Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript - Fourth Edition

By: Nathan Rozentals

Overview of this book

TypeScript is both a language and a set of tools to generate JavaScript, designed by Anders Hejlsberg at Microsoft to help developers write enterprise-scale JavaScript. Mastering Typescript is a golden standard for budding and experienced developers. With a structured approach that will get you up and running with Typescript quickly, this book will introduce core concepts, then build on them to help you understand (and apply) the more advanced language features. You’ll learn by doing while acquiring the best programming practices along the way. This fourth edition also covers a variety of modern JavaScript and TypeScript frameworks, comparing their strengths and weaknesses. You'll explore Angular, React, Vue, RxJs, Express, NodeJS, and others. You'll get up to speed with unit and integration testing, data transformation, serverless technologies, and asynchronous programming. Next, you’ll learn how to integrate with existing JavaScript libraries, control your compiler options, and use decorators and generics. By the end of the book, you will have built a comprehensive set of web applications, having integrated them into a single cohesive website using micro front-end techniques. This book is about learning the language, understanding when to apply its features, and selecting the framework that fits your real-world project perfectly.
Table of Contents (19 chapters)
Other Books You May Enjoy

Express introduction

In this section of the chapter, we will set up a Node and Express development environment, and show how to build the simplest web server with just a few lines of code. We will then discuss routes, and show how to split up our code base into modules for ease of maintenance and readability. Finally, we will discuss how to set configuration parameters for a Node application.

Express setup

In order to build a Node and Express application, we just need to initialize a Node environment, and install a few npm packages, as well as their corresponding declaration files as follows:

mkdir node-express-app
cd node-express-app
npm init
npm install express
npm install @types/express --save-dev

Here, we have created a directory named node-express-app, changed into this directory, and then initialized a Node environment. We then install the express module using npm, and install the TypeScript declaration files for Express, as in @types/express. We will also need...