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)

Class component states

State is an object that determines how the component behaves and renders. We need to introduce state into our app, in order to manage whether our confirmation dialog is open or closed.

This particular state is going to live and be managed within the App component, and be passed in as a prop to the Confirm component.

  1. First, create an open prop in the Confirm component by adding it to its props interface:
interface IProps {
open: boolean;
title: string;
content: string;
cancelCaption?: string;
okCaption?: string;
onOkClick: () => void;
onCancelClick: () => void;
  1. We're going to use the open prop in the render function to determine whether the dialog is visible or not. The confirm-visible CSS class makes the dialog visible.

So, on the outermost div, let's use a JavaScript ternary expression in the className attribute to only include...