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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Jest is a simple-to-configure and powerful JavaScript unit testing framework that is built on top of the popular Jasmine framework. Jasmine has been around for a very long time, and is a mature, fully featured, and widely used testing framework. Jest enhances Jasmine by making it easier to configure, as well as providing a wealth of extra features. Jest tests can also be run concurrently, which significantly speeds up the length of time a test suite will take to run. Jest is available through npm, and will therefore require an npm environment, which can be created as follows:

npm init

Here, we have initialized an npm project and can now install the required Jest packages, as follows:

npm install jest --save-dev

With Jest installed, we can either run it using the command npx jest, or we can modify our package.json file to specify that Jest will be used when we run npm test. Let's update our package.json file as follows:

  "name": "src...