Book Image

Mastering TypeScript - Fourth Edition

By : Nathan Rozentals
4.7 (3)
Book Image

Mastering TypeScript - Fourth Edition

4.7 (3)
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.

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Table of Contents (19 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
1
Up and Running Quickly
Up and Running Quickly
A simple TypeScript IDE
TypeScript basics
Summary
Free Chapter
2
Exploring the Type System
Exploring the Type System
any, let, unions, and enums
More primitive types
Object spread
Tuples
Functions
Summary
3
Interfaces, Classes, Inheritance, and Modules
Interfaces, Classes, Inheritance, and Modules
Interfaces
Classes
Inheritance
Modules
Summary
4
Generics and Advanced Type Inference
Generics and Advanced Type Inference
Generics
Advanced type inference
Summary
5
Asynchronous Language Features
Asynchronous Language Features
Callbacks
Promises
Async and await
Callbacks versus Promises versus async
Summary
6
Decorators
Decorators
Decorator overview
Exploring decorators
Summary
7
Integration with JavaScript
Integration with JavaScript
Declaration files
Declaration file typing
Integration compiler options
Summary
8
Strict Compiler Options
Strict Compiler Options
Nested configuration
Strict Options
no compiler options
Summary
9
Using Observables to Transform Data
Using Observables to Transform Data
Introduction to Observables
Observable errors
Observables returning Observables
Observable Subject
Summary
10
Test-Driven Development
Test-Driven Development
The testing paradigm
Jest
Asynchronous tests
HTML-based tests
Protractor
Summary
11
Angular
Angular
Angular setup
An Angular application
Angular forms
Summary
12
React
React
Introduction to React
A React application
Summary
13
Vue
Vue
Introduction to Vue
A Vue application
Summary
14
Node and Express
Node and Express
Express introduction
An Express application
Summary
15
An AWS Serverless API
An AWS Serverless API
Serverless setup
Building an API
Summary
16
Micro Front-ends
Micro Front-ends
Design concepts
Building a micro front-end application
Summary
17
Other Books You May Enjoy
Other Books You May Enjoy
18
Index
Index

Preface

The TypeScript language and compiler has been a huge success story since its release in late 2012. It quickly carved out a solid footprint in the JavaScript development community, and continues to go from strength to strength. The language has broken into top ten lists of both popular programming languages, and languages most sought after by companies looking to employ programmers.

Many large-scale JavaScript projects, realizing that their JavaScript code base is becoming unwieldy, have made the decision to switch their code base from JavaScript to TypeScript. In 2014, the Microsoft and Google teams announced that Angular 2.0 would be developed using TypeScript, thereby merging Google's AtScript language and Microsoft's TypeScript languages into one. Angular is now one of the top three most popular Single-Page Application frameworks, and has progressed to version 11.

This large-scale industry adoption of TypeScript shows the value of the language, the flexibility of the compiler, and the productivity gains that can be realized with its rich development toolset. On top of this industry support, the ECMAScript standards are being ratified and published on a yearly basis, therefore introducing new language elements quite rapidly. TypeScript provides a way to use features of these standards in our applications today.

Writing TypeScript applications has been made even more appealing with the large collection of declaration files that have been built by the TypeScript community. These declaration files seamlessly integrate a large range of existing JavaScript frameworks into the TypeScript development environment, bringing with them increased productivity, early error detection, and advanced IntelliSense features. Many JavaScript libraries are now automatically bundling TypeScript types into their releases, meaning that there is first-class support from the library developers, who recognize that a large portion of their user base is using TypeScript.

In the end, TypeScript generates JavaScript. This means that wherever we can use JavaScript, we can use TypeScript.

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