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Learn React with TypeScript

Learn React with TypeScript - Second Edition

By : Carl Rippon
4.5 (20)
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Learn React with TypeScript

Learn React with TypeScript

4.5 (20)
By: Carl Rippon

Overview of this book

Reading, navigating, and debugging a large frontend codebase is a major issue faced by frontend developers. This book is designed to help web developers like you learn about ReactJS and TypeScript, both of which power large-scale apps for many organizations. This second edition of Learn React with TypeScript is updated, enhanced, and improved to cover new features of React 18 including hooks, state management libraries, and features of TypeScript 4. The book will enable you to create well-structured and reusable React components that are easy to read and maintain, leveraging modern design patterns. You’ll be able to ensure that all your components are type-safe, making the most of TypeScript features, including some advanced types. You’ll also learn how to manage complex states using Redux and how to interact with a GraphQL web API. Finally, you’ll discover how to write robust unit tests for React components using Jest. By the end of the book, you’ll be well-equipped to use both React and TypeScript.
Table of Contents (19 chapters)
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1
Part 1: Introduction
6
Part 2: App Fundamentals
10
Part 3: Data
14
Part 4: Advanced React

Implementing lazy loading

Currently, all the JavaScript for our app is loaded when the app first loads. This can be problematic in large apps. In this section, we will learn how to only load the JavaScript for components when their route becomes active. This pattern is often referred to as lazy loading. In our app, we will create a lazily loaded admin page.

Understanding React lazy loading

By default, all React components are bundled together and loaded when the app first loads. This is inefficient for large apps – particularly when a user does not use many components. Lazily loading React components addresses this issue because lazy components aren’t included in the initial bundle that is loaded; instead, their JavaScript is fetched and loaded when rendered.

There are two main steps to lazy loading React components. First, the component must be dynamically imported as follows:

const LazyPage = lazy(() => import('./LazyPage'));

In the code...

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Learn React with TypeScript
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