React Native 0.82: The Transition to an All-New Architecture

Introduction

React Native 0.82 arrives as a landmark release, marking the first version that operates entirely on the New Architecture. This significant milestone signals a definitive shift away from the legacy system, setting the stage for a leaner, more efficient codebase in future updates. With this release, developers can expect a cleaner install size and streamlined development experience, alongside several experimental and upgraded features.

React Native 0.82: The Transition to an All-New Architecture

Key Highlights

New Architecture Only – No fallback to legacy mode; the New Architecture is the sole engine.
Experimental Hermes V1 – An opt-in preview of the next-generation JavaScript engine.
React 19.1.1 – Updated React runtime bringing new capabilities.
DOM Node APIs – Enhanced compatibility with web standards.

New Architecture Becomes the Sole Architecture

Since React Native 0.76 made the New Architecture the default, the team has rigorously tested and refined it. Now, with 0.82, the legacy architecture is completely disabled. Attempts to set newArchEnabled=false on Android or RCT_NEW_ARCH_ENABLED=0 on iOS will be ignored; the application will always run on the New Architecture. This move paves the way for future removal of legacy code, reducing bundle size and simplifying maintenance.

How to Migrate to React Native 0.82

Step 1: Update to React Native 0.81 or Expo SDK 54

If you haven't migrated yet, start with React Native 0.81 or Expo SDK 54. These are the last versions that allow you to run the legacy architecture. They include helpful warnings and performance enhancements specific to migrating to the New Architecture.

Step 2: Enable the New Architecture in 0.81

Activate the New Architecture within 0.81 and verify your application functions correctly. This intermediate step is crucial before moving forward.

Step 3: Upgrade to 0.82

Once you are running smoothly on the New Architecture in 0.81, you can safely upgrade to React Native 0.82. Legacy architecture support is no longer an option, so ensure all dependencies are compatible.

Interop Layers and Third-Party Library Support

To ease the transition, interop layers will remain in the codebase for the foreseeable future. All necessary classes and functions for backward compatibility will not be removed soon. The team has verified that third-party libraries offering dual‑architecture support will continue working under the sole New Architecture of 0.82.

Experimental Hermes V1 and Updated React

React Native 0.82 includes an experimental opt‑in for Hermes V1, the next generation of the JavaScript engine. It also ships with React 19.1.1, which introduces new features and performance improvements. Additionally, support for DOM Node APIs brings React Native closer to web standards, enabling smoother cross‑platform development.

Future Removal of Legacy Architecture Classes

To maintain backward compatibility, no legacy APIs are removed in this release. However, the team has announced that removal of the legacy architecture will begin in the next version, as outlined in RFC0929. This will significantly reduce the overall bundle size and simplify the codebase. Stay tuned for updates on the timeline for interop layer removal.

Conclusion

React Native 0.82 is a pivotal release that ushers in a new era of development. By fully embracing the New Architecture, the framework is now faster, more maintainable, and future‑focused. Developers are encouraged to follow the migration path and enjoy the benefits of React 19.1.1, experimental Hermes V1, and DOM Node APIs. For issues with third‑party dependencies or core bugs, reach out to the respective maintainers or the React Native issue tracker.