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Who This Book Is For
The Effective books are intended to be the “standard second book” on their topic. You’ll get the most out of Effective TypeScript if you have some previous practical experience working with JavaScript and TypeScript. My goal with this book is not to teach you TypeScript or JavaScript but to help you advance from a beginning or intermediate user to an expert. The items in this book do this by helping you build mental models of how TypeScript and its ecosystem work, making you aware of pitfalls and traps to avoid, and by guiding you toward using TypeScript’s many capabilities in the most effective ways possible. Whereas a reference book will explain the five ways that a language lets you do X, an Effective book will tell you which of those five to use and why.
TypeScript has evolved rapidly over the past few years, but my hope is that it has stabilized enough that the content in this book will remain valid for years to come. This book focuses primarily on the language itself, rather than any frameworks or build tools. You won’t find any examples of how to use React or Vue with TypeScript, or how to configure TypeScript to work with webpack or Vite. The advice in this book should be relevant to all TypeScript users.