Book Image

Learn React with TypeScript 3

By : Carl Rippon
Book Image

Learn React with TypeScript 3

By: Carl Rippon

Overview of this book

React today is one of the most preferred choices for frontend development. Using React with TypeScript enhances development experience and offers a powerful combination to develop high performing web apps. In this book, you’ll learn how to create well structured and reusable react components that are easy to read and maintain by leveraging modern web development techniques. We will start with learning core TypeScript programming concepts before moving on to building reusable React components. You'll learn how to ensure all your components are type-safe by leveraging TypeScript's capabilities, including the latest on Project references, Tuples in rest parameters, and much more. You'll then be introduced to core features of React such as React Router, managing state with Redux and applying logic in lifecycle methods. Further on, you'll discover the latest features of React such as hooks and suspense which will enable you to create powerful function-based components. You'll get to grips with GraphQL web API using Apollo client to make your app more interactive. Finally, you'll learn how to write robust unit tests for React components using Jest. By the end of the book, you'll be well versed with all you need to develop fully featured web apps with React and TypeScript.
Table of Contents (14 chapters)

Unit Testing with Jest

Building a robust suite of unit tests that catches real bugs and doesn't flag false positives as we refactor our code is one of the hardest tasks we do as software developers. Jest is a great testing tool that helps us meet this challenge, as we'll find out in this chapter.

Perhaps the easiest bits of an app to unit test are pure functions, because there are no side effects to deal with. We'll revisit the validator functions we built in Chapter 7, Working with Form, and implement some unit tests against them in order to learn how to unit test pure functions.

Unit testing components is the most common type of unit test we'll be carrying out while building our apps. We'll learn about it in detail, and leverage a library to help us implement tests that don't unnecessarily break when we refactor our code.

We'll learn what...