# React Native 0.84 - Hermes V1 by Default February 11, 2026 · 7 min read ![Alex Hunt](https://github.com/huntie.png) Alex Hunt Software Engineer @ Meta [](https://x.com/huntie "X")[](https://github.com/huntie "GitHub") ![Alan Lee](https://github.com/alanleedev.png) Alan Lee Software Engineer @ Meta [](https://github.com/alanleedev "GitHub") ![Christian Falch](https://github.com/chrfalch.png) Christian Falch Software Engineer @ Expo [](https://x.com/chrfalch "X")[](https://github.com/chrfalch "GitHub") ![Gabriel Donadel Dall'Agnol](https://github.com/gabrieldonadel.png) Gabriel Donadel Dall'Agnol Software Engineer @ Expo [](https://x.com/donadeldev "X")[](https://github.com/gabrieldonadel "GitHub") Today we're excited to release React Native 0.84! This release makes Hermes V1 the default JavaScript engine, bringing significant performance improvements to all React Native apps. We've also continued removing the Legacy Architecture on both iOS and Android, and are shipping precompiled iOS binaries by default. ### Highlights[​](#highlights "Direct link to Highlights") * [Hermes V1 as Default](/blog/2026/02/11/react-native-0.84.md#hermes-v1-as-default) * [Precompiled Binaries on iOS by Default](/blog/2026/02/11/react-native-0.84.md#precompiled-binaries-on-ios-by-default) * [Legacy Architecture Components Removed](/blog/2026/02/11/react-native-0.84.md#legacy-architecture-components-removed) * [Node.js 22 Minimum](/blog/2026/02/11/react-native-0.84.md#nodejs-22-minimum) ## Hermes V1 as Default[​](#hermes-v1-as-default "Direct link to Hermes V1 as Default") **Hermes V1 is now the default JavaScript engine for React Native on both iOS and Android**, following the initial experimental opt-in in React Native 0.82. Hermes V1 represents the next evolution of the Hermes engine, with significant improvements to both the compiler and VM that deliver measurably better JavaScript performance. **What This Means for Your App** * **Automatic performance gains**: All apps will use Hermes V1 by default, bringing improved execution speed and reduced memory usage. * **No migration required**: If you're already using Hermes (the default since 0.70), you'll automatically get Hermes V1. No configuration changes needed. **Opting out from Hermes V1** **Package manager override** Force the installation of the legacy `hermes-compiler` package in your `package.json`: * npm * yarn * pnpm package.json ``` "overrides": { "hermes-compiler": "0.15.0" } ``` package.json ``` "resolutions": { "hermes-compiler": "0.15.0" } ``` package.json ``` "pnpm": { "overrides": { "hermes-compiler": "0.15.0" } } ``` **iOS** When installing CocoaPods dependencies, pass the `RCT_HERMES_V1_ENABLED=0` and `RCT_USE_PREBUILT_RNCORE=0` environment variables. **Android** Add `hermesV1Enabled=false` inside the `android/gradle.properties` file, and configure the application to [build React Native from source](/contributing/how-to-build-from-source.md#update-your-project-to-build-from-source). ## Precompiled Binaries on iOS by Default[​](#precompiled-binaries-on-ios-by-default "Direct link to Precompiled Binaries on iOS by Default") React Native 0.84 now ships precompiled binaries on iOS by default. Previously introduced as an opt-in, precompiled binaries are now enabled out of the box, significantly reducing build times for iOS apps. This means you no longer need to compile React Native core from source every time you do a clean build. The precompiled `.xcframework` binaries are automatically downloaded and used during `pod install`. info If you need to build React Native from source (for example, to opt out of Hermes V1), you can disable precompiled binaries by setting `RCT_USE_PREBUILT_RNCORE=0` when installing pods. ## Legacy Architecture Components Removed[​](#legacy-architecture-components-removed "Direct link to Legacy Architecture Components Removed") Building on the work started in 0.82 (which made the New Architecture the only runtime option), React Native 0.84 continues removing Legacy Architecture code from both iOS and Android. As described in the [RFC](https://github.com/react-native-community/discussions-and-proposals/pull/929), we're removing several Legacy Architecture classes in each release. #### iOS[​](#ios "Direct link to iOS") In 0.83, we introduced the experimental `RCT_REMOVE_LEGACY_ARCH` flag to compile out Legacy Architecture code. In 0.84, this is now the default behaviour — Legacy Architecture code is no longer included in your iOS builds, reducing both build time and app size. No breakages are expected for apps already on the New Architecture — the Interop Layer code required for compatibility remains in place. **Re-enabling Legacy Architecture code on iOS** If you need to re-enable Legacy Architecture code in your iOS builds, you'll need to build from source. Install CocoaPods dependencies with the following flags: ``` RCT_USE_PREBUILT_RNCORE=0 RCT_REMOVE_LEGACY_ARCH=0 bundle exec pod install ``` #### Android[​](#android "Direct link to Android") **Removed Legacy Architecture classes** The following classes have been removed in this release: ``` com.facebook.react.LazyReactPackage com.facebook.react.bridge.CxxModuleWrapper com.facebook.react.bridge.CxxModuleWrapperBase com.facebook.react.bridge.CallbackImpl com.facebook.react.bridge.NotThreadSafeBridgeIdleDebugListener com.facebook.react.bridge.OnBatchCompleteListener com.facebook.react.bridge.ReactCxxErrorHandler com.facebook.react.bridge.ReactInstanceManagerInspectorTarget com.facebook.react.modules.debug.DidJSUpdateUiDuringFrameDetector com.facebook.react.devsupport.BridgeDevSupportManager com.facebook.react.uimanager.NativeKind com.facebook.react.uimanager.debug.NotThreadSafeViewHierarchyUpdateDebugListener com.facebook.react.uimanager.layoutanimation.LayoutAnimationController com.facebook.react.uimanager.layoutanimation.LayoutAnimationListener ``` ## Node.js 22 Minimum[​](#nodejs-22-minimum "Direct link to Node.js 22 Minimum") React Native 0.84 requires **Node.js v22.11 or later**. This bump improves the availability of modern JavaScript features across the ecosystem of React Native tooling. Make sure to update your Node.js version before upgrading. We recommend using a Node version manager like [nvm](https://github.com/nvm-sh/nvm) or [fnm](https://github.com/Schniz/fnm) to manage Node versions. ## Other Changes[​](#other-changes "Direct link to Other Changes") ### React 19.2.3[​](#react-1923 "Direct link to React 19.2.3") This release syncs React 19.2.3 into React Native, including the latest fixes and improvements from the React team. ### ESLint v9 Flat Config[​](#eslint-v9-flat-config "Direct link to ESLint v9 Flat Config") React Native's ESLint config now supports [ESLint v9 Flat Config](https://eslint.org/docs/latest/use/configure/configuration-files), making it easier to adopt the latest ESLint tooling in your project. ### Platform Support[​](#platform-support "Direct link to Platform Support") * **Image formats**: React Native 0.84 includes support for additional image formats (HEIC and HEIF), making it easier to work with modern camera outputs and image libraries. * **PlatformColor**: Enhanced testing and support for `PlatformColor` in animated interpolations and output ranges. * **Keyboard events on Android**: Added `onKeyDown`/`onKeyUp` support on Android, enabling keyboard event handling for hardware keyboards and TV remotes. ### Accessibility[​](#accessibility "Direct link to Accessibility") Text components with `onPress` or `onLongPress` handlers now automatically receive `accessibilityRole="link"` for improved accessibility support, ensuring screen readers properly announce interactive text elements. On Android, significant work has been done to fix accessibility state issues with recycled views — ensuring that `isClickable` and `OnClickListener` states are properly reset when views are recycled, preventing screen readers from announcing incorrect states. ### URL API Improvements[​](#url-api-improvements "Direct link to URL API Improvements") Added missing standard properties to `URL` (`hash`, `host`, `pathname`, etc.) and methods to `URLSearchParams` (`get`, `set`, `delete`, etc.), bringing React Native's URL implementation closer to the web standard. Also fixed a `URLSearchParams` duplicate entry issue. ### Other Breaking Changes[​](#other-breaking-changes "Direct link to Other Breaking Changes") #### iOS[​](#ios-1 "Direct link to iOS") * Fixed a rare `EXC_BAD_ACCESS` crash in `ImageResponseObserverCoordinator` by wrapping observers in reference-counted pointers. This changes the object declarations in the `RCTImage` observer API, which may affect dependent libraries such as `react-native-svg`. #### Android[​](#android-1 "Direct link to Android") * Removed `BridgeDevSupportManager`. #### C++[​](#c "Direct link to C++") * `JSBigString` now implements `jsi::Buffer` directly. The `BigStringBuffer` indirection has been removed (deprecated for now). Code directly subclassing or depending on `BigStringBuffer` may need updating. #### JS[​](#js "Direct link to JS") * The legacy Perf and Network tabs have been removed from the in-app Element Inspector, as these features are now available in [React Native DevTools](/docs/react-native-devtools.md). Read the full list of breaking changes in the [CHANGELOG for 0.84](https://github.com/facebook/react-native/blob/main/CHANGELOG.md#v0840). ## Deprecations[​](#deprecations "Direct link to Deprecations") This release ships two deprecations: * **Networking:** The `XHRInterceptor` and `WebSocketInterceptor` APIs are deprecated. Developer tools should use the Chrome DevTools Protocol (CDP) `Network` domain instead. * **TurboModules**: `TurboModuleProviderFunctionType` is deprecated. ## Acknowledgements[​](#acknowledgements "Direct link to Acknowledgements") React Native 0.84 contains over 650 commits from 95 contributors. Thank you for all your hard work! We want to send a special thank you to those who shipped significant contributions in this release: * [Riccardo Cipolleschi](https://github.com/cipolleschi) for precompiled iOS binaries by default and removing the Legacy Architecture on iOS. * [Rob Hogan](https://github.com/robhogan) for the Node.js 22 version bump. * [Fabrizio Cucci](https://github.com/fabriziocucci) for accessibility improvements on Android. * [@pipopotamasu](https://github.com/pipopotamasu) for ESLint v9 Flat Config support. ## Upgrade to 0.84[​](#upgrade-to-084 "Direct link to Upgrade to 0.84") info 0.84 is now the latest stable version of React Native and 0.81.x moves to unsupported. For more information see [React Native's support policy](https://github.com/reactwg/react-native-releases/blob/main/docs/support.md). #### Upgrading[​](#upgrading "Direct link to Upgrading") Please use the [React Native Upgrade Helper](https://react-native-community.github.io/upgrade-helper/) to view code changes between React Native versions for existing projects, in addition to the [Upgrading docs](/docs/upgrading.md). > **💡 New**: Try the experimental [`upgrade-react-native` AI skill for Community CLI Projects](https://skills.sh/react-native-community/skills/upgrade-react-native). #### Create a new project[​](#create-a-new-project "Direct link to Create a new project") ``` npx @react-native-community/cli@latest init MyProject --version latest ``` #### Expo[​](#expo "Direct link to Expo") For Expo projects, React Native 0.84 will be available as part of the `expo@canary` releases. The next SDK, SDK 56, will be shipped with the next stable release of React Native: 0.85. **Tags:** * [announcement](/blog/tags/announcement) * [release](/blog/tags/release)