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Merged
Simek merged 3 commits into from
Oct 2, 2025
Merged

Simplify JavaScriptCore opt-out instructions #4825

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c4ac4ea
Simplify JavaScriptCore opt-out instructions
jvaronenka Sep 30, 2025
72246f2
Merge branch 'facebook:main' into patch-1
jvaronenka Oct 1, 2025
3d25e50
Updated unversioned docs as well
Oct 1, 2025
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25 changes: 1 addition & 24 deletions docs/hermes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -92,27 +92,4 @@ This will compile JavaScript to Hermes Bytecode during build time which will imp

## Switching back to JavaScriptCore

React Native also supports using JavaScriptCore as the [JavaScript engine](javascript-environment). Follow these instructions to opt-out of Hermes.

### Android

Edit your `android/gradle.properties` file and flip `hermesEnabled` back to false:

```diff
# Use this property to enable or disable the Hermes JS engine.
# If set to false, you will be using JSC instead.
hermesEnabled=false
```

### iOS

Edit your `ios/Podfile` file and make the change illustrated below:

```diff
use_react_native!(
:path => config[:reactNativePath],
+ :hermes_enabled => false,
# An absolute path to your application root.
:app_path => "#{Pod::Config.instance.installation_root}/.."
)
```
React Native also supports using JavaScriptCore as the [JavaScript engine](javascript-environment). Follow the instructions [from the community repository](https://github.com/react-native-community/javascriptcore) to opt-out of Hermes.
25 changes: 1 addition & 24 deletions website/versioned_docs/version-0.81/hermes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -92,27 +92,4 @@ This will compile JavaScript to Hermes Bytecode during build time which will imp

## Switching back to JavaScriptCore

React Native also supports using JavaScriptCore as the [JavaScript engine](javascript-environment). Follow these instructions to opt-out of Hermes.

### Android

Edit your `android/gradle.properties` file and flip `hermesEnabled` back to false:

```diff
# Use this property to enable or disable the Hermes JS engine.
# If set to false, you will be using JSC instead.
hermesEnabled=false
```

### iOS

Edit your `ios/Podfile` file and make the change illustrated below:

```diff
use_react_native!(
:path => config[:reactNativePath],
+ :hermes_enabled => false,
# An absolute path to your application root.
:app_path => "#{Pod::Config.instance.installation_root}/.."
)
```
React Native also supports using JavaScriptCore as the [JavaScript engine](javascript-environment). Follow the instructions [from the community repository](https://github.com/react-native-community/javascriptcore) to opt-out of Hermes.