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Book:
Essential TypeScript 4: From Beginner to Pro
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Adam Freeman
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Apress
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Year:
2021
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Learn the essentials and more of TypeScript, a popular superset of the JavaScript language that adds support for static typing. TypeScript combines the typing features of C# or Java with the flexibility of JavaScript, reducing typing errors and providing an easier path to JavaScript development.
Author Adam Freeman explains how to get the most from TypeScript 4 in this second edition of his best-selling book. He begins by describing the TypeScript language and the benefits it offers and then shows you how to use TypeScript in real-world scenarios, including development with the DOM API, and popular frameworks such as Angular and React. He starts from the nuts-and-bolts and builds up to the most advanced and sophisticated features.
Each topic is covered clearly and concisely, and is packed with the details you need to be effective. The most important features are given a no-nonsense, in-depth treatment and chapters include common problems and teach you how to avoid them.
What You Will Learn

Gain a solid understanding of the TypeScript language and tools
Use TypeScript for client- and server-side development
Extend and customize TypeScript
Test your TypeScript code
Apply TypeScript with the DOM API, Angular, React, and Vue.js

Who This Book Is For
JavaScript developers who want to use TypeScript to create client-side or server-side applications

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Book cover of Essential TypeScript 4

Adam Freeman

Essential TypeScript 4

From Beginner to Pro

2nd ed.

Logo of the publisher

Adam Freeman

London, UK

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/9781484270103 . For more detailed information, please visit www.apress.com/source-code .

ISBN 978-1-4842-7010-3 e-ISBN 978-1-4842-7011-0

https://doi.org/10.1007/978-1-4842-7011-0

Adam Freeman 2021

This work is subject to copyright. All rights are solely and exclusively licensed by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.

The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.

The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Distributed to the book trade worldwide by Apress Media, LLC, 1 New York Plaza, New York, NY 10004, U.S.A. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

Dedicated to my lovely wife, Jacqui Griffyth.(And also to Peanut.)

Table of Contents

Part I: Getting Started with TypeScript

Part II: Working with TypeScript

Part III: Creating Web Applications

About the Author

Adam Freeman

is an experienced IT professional who has held senior positions in a range of - photo 3

is an experienced IT professional who has held senior positions in a range of companies, most recently serving as chief technology officer and chief operating officer of a global bank. Now retired, he spends his time writing and long-distance running.

About the Technical Reviewer

Fabio Claudio Ferracchiati

is a senior consultant and a senior analyst/developer using Microsoft technologies. He works for BluArancio ( www.bluarancio.com ). He is a Microsoft Certified Solution Developer for .NET, a Microsoft Certified Application Developer for .NET, a Microsoft Certified Professional, and a prolific author and technical reviewer. Over the past ten years, hes written articles for Italian and international magazines and coauthored more than ten books on a variety of computer topics.

Part I Getting Started with TypeScript

The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2021

A. Freeman Essential TypeScript 4 https://doi.org/10.1007/978-1-4842-7011-0_1

1. Your First TypeScript Application

Adam Freeman

(1)

London, UK

The best way to get started with TypeScript is to dive in. In this chapter, I take you through a simple development process to create an application that keeps track of to-do items. Later chapters show how TypeScript features work in detail, but a simple example will be enough to demonstrate how the basic TypeScript features work. Dont worry if you dont understand everything in this chapter. The idea is just to get an overall sense of how TypeScript works and how it fits into an application.

Getting Ready for This Book

Four packages are required to get ready for this book. Perform each installation described in the following sections and run the test provided for each of them to ensure that the packages work as they should.

Step 1: Install Node.js

First, download and install Node.js, also known as Node, from to check that Node and NPM are working.

node --version

npm --version

Listing 1-1.

Checking Node and NPM

The output from the first command should be v14.15.4 , indicating that Node is working and the correct version has been installed. The output from the second command should be 6.14.10 , which indicates that NPM is working.

Step 2: Install Git

The second task is to download and install the Git version management tool from to check that Git is working.

git --version

Listing 1-2.

Checking Git

At the time of writing, the latest version of Git for all platforms is 2.30.0.

Step 3: Install TypeScript

The third step is to install the TypeScript package. Use a command prompt to run the command shown in Listing .

npm install --global typescript@4.2.2

Listing 1-3.

Installing the TypeScript Package

Once the package has been installed, run the command shown in Listing to ensure that the compiler was installed correctly.

tsc --version

Listing 1-4.

Testing the TypeScript Compiler

The TypeScript compiler is called tsc , and the output from the command in Listing should be Version 4.2.2 .

Step 4: Install a Programmers Editor

The final step is to install a programmers editor that supports TypeScript. Most popular editors can be used for TypeScript development, but if you dont have a preferred editor, then download and install Visual Studio Code from https://code.visualstudio.com . Visual Studio Code is an open-source, cross-platform code editor that is free to use and is the editor I used while writing the examples for this book.

If you are using Visual Studio Code, run the command code to start the editor or use the program icon created during installation, and you will see the welcome screen shown in Figure . (You may need to add Visual Studio Code to your command prompt path before using the code command.)

Figure 1-1.

The Visual Studio Code welcome screen

Tip

Some editors will let you specify a different version of TypeScript than the one contained in the project, which can cause errors to be displayed in the code editor even when the command-line tools show successful compilation. If you are using Visual Studio Code, for example, you will see the version of TypeScript that is used displayed at the bottom right of the editor window when you edit a TypeScript file. Click the version that is shown, click Select TypeScript Version, and select the version you require.

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