Book Image

Mastering TypeScript - Fourth Edition

By : Nathan Rozentals
Book Image

Mastering TypeScript - Fourth Edition

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.
Table of Contents (19 chapters)
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Nested configuration

The TypeScript compiler is able to re-use a tsconfig.json file in another directory when compiling code in the current directory. This feature is handy if we would like to override a compiler option when running tsc within a specific directory. The tsconfig.json file uses the "extends" option for this purpose. As an example of this nested configuration, consider the following source tree:

├── sub1
│   ├── SampleJsFile.js
│   └── tsconfig.json
├── SampleTsFile.ts
└── tsconfig.json

Here, we have a tsconfig.json file in the project root directory, as well as a TypeScript file named SampleTsFile.ts. We also have a subdirectory named sub1 that contains a tsconfig.json file, and a JavaScript file named SampleJsFile.js. The tsconfig.json file in the project root directory is as follows:

    "compilerOptions": {