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Dr. Axel Rauschmayer
Tackling TypeScript
Upgrading from JavaScript
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Tackling TypeScript
Dr. Axel Rauschmayer 2021
Copyright ? 2021 by Dr. Axel Rauschmayer
All rights reserved. This book or any portion thereof may not be reproduced or used in any manner whatsoever without the express written permission of the publisher except for the use of brief quotations in a book review or scholarly journal.
Contents
I Preliminaries
5
1 About this book
7
1.1 Where is the homepage of this book? . . . . . . . . . . . . . . . . . . . . 7
1.2 What is in this book? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 What do I get for my money? . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 How can I preview the content? . . . . . . . . . . . . . . . . . . . . . . . 8
1.5 How do I report errors? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6 What do the notes with icons mean? . . . . . . . . . . . . . . . . . . . . . 8
1.7 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 Why TypeScript?
11
2.1 The benefits of using TypeScript . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 The downsides of using TypeScript . . . . . . . . . . . . . . . . . . . . . 13
2.3 TypeScript myths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3 Free resources on TypeScript
15
II Getting started with TypeScript
17
4 How does TypeScript work? The bird's eye view
19
4.1 The structure of TypeScript projects . . . . . . . . . . . . . . . . . . . . . 19
4.2 Programming TypeScript via an integrated development environment (IDE) 20
4.3 Other files produced by the TypeScript compiler . . . . . . . . . . . . . . 21
4.4 Using the TypeScript compiler for plain JavaScript files . . . . . . . . . . 22
5 Trying out TypeScript
23
5.1 The TypeScript Playground . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 TS Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Notation used in this book
25
6.1 Test assertions (dynamic) . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2 Type assertions (static) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7 The essentials of TypeScript
27
7.1 What you'll learn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.2 Specifying the comprehensiveness of type checking . . . . . . . . . . . . 28
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