React Native 0.86.2: Key Changes and What They Mean for You

React Native 0.86.2 is here, bringing some important updates and fixes that can enhance your development experience. If you're using React Native to build mobile apps, these changes might impact how your app performs and how you manage your code. Let's dive into the details of what's changed, who is affected, and how you can ensure a smooth upgrade.

What changed

The latest release of React Native, version 0.86.2, addresses some key issues and introduces updates that developers should be aware of. One significant fix involves the layout system, specifically the display: contents property. This fix corrects how these nodes were previously marked with hasNewLayout, which could have caused layout inconsistencies in your app.

On the Android side, improvements have been made to the runtime system. The ReactInstanceManager, a component that helps manage the lifecycle of your React Native app, now uses a more explicit locking mechanism. This change helps prevent potential synchronization issues that could occur during the app's destruction phase.

Additionally, the Hermes JavaScript engine, which is a tool that helps run JavaScript code efficiently on mobile devices, has been updated to version 250829098.0.16. This update includes performance enhancements that can make your app run smoother, especially on devices with limited resources.

Who is affected

These changes primarily affect developers who are actively maintaining and updating their React Native apps. If your app relies heavily on complex layouts or runs on Android devices, you might notice improvements in performance and stability. The Hermes update is particularly beneficial for apps that need to optimize JavaScript execution speed, which is crucial for apps with intensive computations or animations.

Practical impact

For developers, the practical impact of these updates is multi-fold. The layout fix ensures that your app's UI behaves as expected, reducing the chances of unexpected layout shifts. This can lead to a more polished and professional-looking app.

The runtime improvements on Android mean that your app can handle lifecycle events more gracefully, reducing the risk of crashes or freezes during app shutdown. This can enhance the overall user experience, making your app more reliable.

The Hermes update can lead to faster app startup times and better runtime performance, especially on lower-end devices. This is crucial for maintaining a smooth user experience across a wide range of devices.

Action checklist

• Review your app's layout to ensure that the display: contents property is behaving as expected.
• Test your app on Android devices to confirm that lifecycle events are handled correctly.
• Update to the latest Hermes version to take advantage of performance improvements.
• Use the Upgrade Helper to assist with the transition to React Native 0.86.2.
• Conduct thorough testing of your app to ensure that no new issues have been introduced.

When to ignore

If your app is stable and not experiencing any of the issues addressed in this update, you might choose to delay upgrading. However, staying up-to-date with the latest version can prevent future problems and ensure compatibility with new features and tools.

For those using the Good Food Pro platform, upgrading to React Native 0.86.2 can enhance app performance and reliability. By staying current with the latest updates, you ensure that your food delivery apps remain competitive and efficient. For more information on how to implement these changes, visit our documentation and explore the features that can help you get the most out of your app.