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)

Default JSX properties

TypeScript 3 has also improved how we can set default properties on React components with --strictNullChecks. Before TypeScript 3, we had to set properties that had default values as optional and perform null checks when referencing them. We haven't introduced React yet in this book, so we'll only touch on this briefly at this point.

Let's look through an example to get a feel for the improvement:

  1. The following is a React component with some default properties in TypeScript 2.9. The component is called SplitText and it takes in some text, splits it, and renders the bits that have been split in a list:
interface IProps {
text: string;
delimiter?: string;

class SplitText extends Component<IProps> {
static defaultProps = {
delimiter: ","
render() {
const bits = this.props.text.split(this.props.delimiter!);