Chore(mobile): Upgrade Expo SDK 51 To 55 For React 19

When it comes to keeping your mobile app running smoothly, one of the biggest updates you’ll hear about lately is the chore(mobile) upgrade from Expo SDK version 51 to 55. This change isn’t just a number - it’s a big shift that affects how you build, test, and deploy your React applications. Whether you’re working with React 19, RN 0.85, or any of the latest navigation libraries, understanding this transition is key to staying ahead.

In this article, we’re diving into the full picture of what this upgrade means for you. We’ll break down the why behind the change, the how you should approach the migration, and the real impact on your development workflow. We’ll also cover the essential steps you need to take, like fixing installations, updating config files, and making sure your tests still pass. Plus, we’ll talk about some common pitfalls so you can avoid mistakes that might slow you down. So if you're serious about keeping your app modern and compliant, this is the guide you need.

Let’s start by understanding the context of this upgrade. Expo has been evolving rapidly, and the version numbering tells a story about stability and security. Going from Expo SDK 51 to 55 means you’re moving into a phase where several security fixes and performance improvements are in place. This is especially important if you’re using tools like @xmldom/xmldom or @expo/cli, which can expose vulnerabilities if not updated properly.

When you upgrade, you’ll notice a few key changes. First, the React 19 release brings new features and refactors that require specific configurations. You’ll need to adjust how your components are built, especially when dealing with forwardRef and hydration issues. The shift to RN 0.85 also means a change in architecture defaults - this might affect how you handle native modules and state management.

But don’t worry, we’re here to make this smooth. The step-by-step process to handle this upgrade is straightforward if you follow the right commands. You’ll want to run npm install --fix after any breaking changes, then double-check your metro.config.js and babel.config.js to ensure everything is aligned. It’s also a good idea to rerun your typechecking and the Jest suite to confirm that no type errors pop up during the test run.

Now, let’s talk about the scope of this upgrade. You’re not just changing one file - you’re updating multiple packages that rely on the Expo SDK. From react-native-safe-area-context to @react-navigation/native, every component plays a role in this transition. If you’re working on a project with a complex navigation setup, you’ll need to adjust your navigation patterns to match the new API. It’s a good idea to review the documentation for each library and update your code accordingly.

One of the most important things to remember is that this upgrade affects how your app handles drag-and-drop functionality, especially when using React 19 and React Native. The new SDK introduces some changes in how animations and interactions are rendered, so you’ll need to test thoroughly to ensure a seamless user experience.

If you’re using jest-expo 55, it’s crucial to update the setup so that mock objects and tests work as expected. This might involve changing how you configure test environments or adjusting your test scripts. Don’t forget to clean up any old dependencies that may no longer be compatible.

In terms of real-world impact, this upgrade is aimed at improving performance and security. For developers using React 19, RN 0.85, and any of the newer navigation tools, it’s essential to stay on top of these changes. The benefits of this update include faster load times, better error handling, and a more secure codebase. However, it’s also important to be aware of the potential challenges, like learning new APIs or fixing broken features.

If you’re just starting to explore this upgrade, it’s wise to take your time and test everything thoroughly. Make sure to run your app on different devices and network conditions to catch any issues early. By following the steps outlined here, you’ll be well-prepared to make the transition without disrupting your workflow.

In summary, the chore(mobile) upgrade from Expo SDK 51 to 55 is a necessary step for developers looking to modernize their React-based mobile apps. It brings with it a host of improvements, but it also requires careful planning and execution. By understanding the scope, preparing your environment, and testing rigorously, you can ensure that your app remains robust and future-ready. So whether you’re a seasoned developer or just getting into the scene, this article is here to help you navigate the changes confidently.

Remember, the key to a successful upgrade lies in preparation and attention to detail. If you follow the guidelines, avoid common mistakes, and stay updated on best practices, you’ll be able to leverage the full potential of Expo SDK 55. Let’s dive deeper into each part of the process and make sure you’re ready to take this step confidently.