![]() Tree shaking refers to eliminating dead code - i.e., the unwanted JavaScript that is not being used by your app. ![]() ![]() Here’s an example of code splitting in action on the Loom website: Many organizations use this strategy in production, which speaks to its efficiency. This helps the framework “smartly” split JavaScript into even smaller chunks that shouldn’t be bundled with client-side JavaScript chunks. However, you can delegate some of the components used as server-side only. If you’re using a JavaScript library or framework like Next.js or Vue, you don’t need to do this manually - most modern JavaScript frameworks support code splitting by default. This strategy reduces the overall network load on the main thread responsible for initializing and downloading JavaScript scripts: You can split it into smaller chunks that can be downloaded only when needed: // 30 kb file Imagine you had a single JavaScript bundle like the following: // 60kb file You can then load these chunks on demand or in parallel network requests, meaning you don’t have to load your entire JavaScript bundle every time - only what’s necessary. Code splittingĬode splitting is a technique used to split JavaScript code into smaller, more manageable chunks. These tips and patterns will help you ship more robust and efficient JavaScript bundles to the web, whether you are using plain old JavaScript or any dedicated libraries or frameworks like React, SolidJS, or Vue.js. There are a couple of ways you can remove unused JavaScript from your web apps. Even worse, those dependencies could have their own unused JavaScript, further adding to the unnecessary bloat in your project. In other words, you might be using a third-party JavaScript dependency in your code that you are not using. These could be functions, classes, or variables that are no longer being executed, called, or used anywhere in your app.Īnother reason could be unused dependencies. The most obvious reason is that you might have added code that you no longer need, but you forgot to remove it in the final bundle. There could be many reasons for unused code in your JavaScript bundle. This dead code sits dormant and increases the overall size of your JavaScript bundle, which can impact performance. In the simplest terms, unused JavaScript - often called dead code - is any code that your web app doesn’t use or need, but exists in the final JavaScript bundle that you ship to the browser. In this article, you will learn about a series of patterns and tips that you can use to reduce this bloat by removing unused JavaScript, helping you save time, optimize performance, and improve efficiency. Unused JavaScript adds unnecessary bloat to your web applications and slows down overall performance. Reducing JavaScript is a critical aspect of developing modern websites and a key aspect in terms of overall page efficiency.Īs software engineering evolves, there is always a push for faster, more efficient sites with an overall smaller JavaScript payload.
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