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)

Using axios with function components

In this section, we'll implement REST API calls using axios in a function component. We'll refactor the App component we built in the last section:

  1. First, we are going to declare a constant, called defaultPosts that is going to hold the default posts state we'll use a little later. We'll add this after the IPost interface and set this to an empty array:
const defaultPosts: IPost[] = [];
  1. We'll remove the IState interface because the state will be structured as individual pieces of state now.
  2. We'll also remove the previous App class component.
  3. Next, let's start the App function component under the defaultPosts constant:
const App: React.SFC = () => {}
  1. We can now create the state for the posts, error, cancel token, loading flag, and posts being edited:
const App: React.SFC = () => {
const [posts...