The aim of this book is to build your confidence with TypeScript and to teach all the essential things you’ll need to know to build a TypeScript application. You’ll need to have some experience with JavaScript, but that’s it. No TypeScript experience is necessary.
We’ll be starting from the basics, but we won’t stop there. By the end of the book, you’ll feel like a TypeScript wizard. You’ll be able to work with TypeScript instead of against it, quickly diagnosing errors and moving faster than you ever did with JavaScript.
What’s Different About Typescript?
What makes TypeScript different from JavaScript can be summed up in a single word: types. But there’s a common misconception here. People think Typescript’s core mission is to make JavaScript a strongly typed language, like C# or Rust, which is not quite accurate. TypeScript wasn’t invented to make JavaScript strongly typed. It was built to allow amazing tooling for JavaScript.
Imagine you’re building an integrated development environment (IDE) and you want to warn people when they mistype a function name or object property. If you don’t know the shapes of the variables, parameters, and objects in your code, you’ll have to resort to guesswork. But if you do know the types of everything in your app, you can begin implementing powerful IDE features like autocomplete, inline errors, and automatic refactors.
CONTENTS.
FOREWORD INTRODUCTION.
The Birth of TypeScript.
Why Now?.
Who Is This Book For?.
What We’ll Cover.
Online Resources.
The Book’s Exercises.
@ts-expect-error.
Vitest.
PART I: GETTING STARTED.
1 KICKSTART YOUR TYPESCRIPT SETUP.
2 IDE SUPERPOWERS.
3 TYPESCRIPT IN THE DEVELOPMENT PIPELINE.
PART II: FUNDAMENTALS.
4 ESSENTIAL TYPES AND ANNOTATIONS.
5 UNIONS, LITERALS, AND NARROWING.
PART III: OBJECTS, CLASSES, AND MUTABILITY.
6 OBJECTS.
7 MUTABILITY.
8 CLASSES.
9 TYPESCRIPT-ONLY FEATURES.
PART IV: WORKING WITH THE COMPILER.
10 DERIVING TYPES.
11 ANNOTATIONS AND ASSERTIONS.
12 THE WEIRD PARTS.
PART V: UNDERSTANDING THE ENVIRONMENT.
13 MODULES, SCRIPTS, AND DECLARATION FILES.
14 CONFIGURING TYPESCRIPT.
PART VI: ADVANCED APPLICATION DEVELOPMENT.
15 DESIGNING YOUR TYPES.
16 BUILDING POWERFUL SHARED UTILITIES.
INDEX.
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