Book Image

JavaScript Design Patterns

By : Hugo Di Francesco
Book Image

JavaScript Design Patterns

By: Hugo Di Francesco

Overview of this book

Unlock the potential of JavaScript design patterns, the foundation for development teams seeking structured and reusable solutions to common software development challenges in this guide to improving code maintainability, scalability, and performance. Discover how these patterns equip businesses with cleaner and more maintainable code, promote team collaboration, reduce errors, and save time and costs. This book provides a comprehensive view of design patterns in modern (ES6+) JavaScript with real-world examples of their deployment in professional settings. You’ll start by learning how to use creational, structural, and behavioral design patterns in idiomatic JavaScript, and then shift focus to the architecture and UI patterns. Here, you’ll learn how to apply patterns for libraries such as React and extend them further to general web frontend and micro frontend approaches. The last section of the book introduces and illustrates sets of performance and security patterns, including messaging and events, asset and JavaScript loading strategies, and asynchronous programming performance patterns. Throughout the book, examples featuring React and Next.js, in addition to JavaScript and Web API examples, will help you choose and implement proven design patterns across diverse web ecosystems, transforming the way you approach development.
Table of Contents (16 chapters)
Part 1:Design Patterns
Part 2:Architecture and UI Patterns
Part 3:Performance and Security Patterns

Patterns for secure frame/native WebView bridge messaging

Gaining a deep understanding of messaging patterns with postMessage in JavaScript is crucial for working in a variety of contexts. postMessage is defined on the following Web API objects: Window, MessagePort, Worker, Client, ServiceWorker, and BroadcastChannel.

In other words, postMessage-based messaging is useful for document-to-iframe, iframe-to-iframe, document-to-worker, and service worker-to-document communication and that’s only the Web APIs. Due to how widespread the postMessage API is, it’s also adopted in non-standard APIs for handling multiple JavaScript contexts. For example, web extensions for Chrome and Firefox contain multiple JavaScript contexts: the devtools panel, proxy, backend, and background script. The postMessage API is also used for Android and iOS communication between the native code and WebViews.

The scenario that we’ll go through is about iframes and how they communicate...