How to fix “Invariant Violation: TurboModuleRegistry.getEnforcing(…):


How to fix “Invariant Violation: TurboModuleRegistry.getEnforcing(…): “RNCWebView” was not found” error in React Native

When working with React Native, especially when integrating additional libraries like React-native-signature-canvas, encountering errors can be frustrating. One of these errors is:

Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'RNCWebView' could not be found

This error often occurs when the dependencies needed for a module are not properly linked or when the environment you are using does not support the required native modules. Here’s an overview of how I encountered and resolved this issue.

The problem

I was working on a React Native project where I needed to add the React-Native-Signature-Canvas library to capture user signatures. The installation process seemed simple:

  1. Installed the package:
npm install react-native-signature-canvas

2. Since React-native-signature-canvas depends on React-native-webview, I also installed the WebView package:

npm install react-native-webview

3. I navigated to the iOS directory and executed:

cd ios
pod install

Everything seemed fine, but when I tried to run the application I encountered the following error:

Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'RNCWebView' could not be found

Troubleshooting the problem

I initially spent about an hour trying to debug this issue. Here’s what I did to resolve the issue:

  1. I checked the installation: I confirmed that React-native-signature-canvas and React-native-webview were installed correctly and the pod installation completed without errors.
  2. Rebuild the project: I tried cleaning the build folder and rebuilding the project from scratch, but the error persisted.
  3. Documentation review: I carefully re-read the documentation for both libraries to make sure I didn’t miss any steps.

The solution

After some research and trial and error, I discovered the root cause of the problem: Expo Go.

  • Limitations of Expo Go: The Expo Go app does not support custom native modules out of the box. Since React-native-signature-canvas relies on React-native-webview, which is a native module, the error occurred because Expo Go could not find the RNCWebView module.

To resolve this issue, I did the following:

  1. EAS construction: I used Expo’s EAS (Expo Application Services) to create the application with the required native modules:
eas build --platform ios
  1. Running the application: Instead of using Expo Go, I ran the application directly on a simulator using:
npm run ios

After these steps, the error was resolved and the application worked as expected.

Key takeaways

  • Expo Go is limited: When working with native modules in React Native, remember that Expo Go cannot handle them. You will either need to eject from Expo Managed Workflow or use EAS Build.
  • Check the dependencies: Always make sure that all dependencies required by the library are correctly installed and linked.
  • Use EAS Build for native modules: If you use Expo, the easiest way to manage native modules is to use EAS Build, which allows you to include and build native code in your project.

By following these steps, you should be able to resolve the issue. "RNCWebView" error not found and continue building your React Native app.

Conclusion

It’s not uncommon to encounter errors when developing in React Native, but with a methodical approach to troubleshooting, you can often resolve them quickly. Understanding the limitations of your development environment, such as Expo Go, can save you a lot of time and frustration. If you encounter a similar error, I hope this guide helps you find a solution faster!

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Grpahic Designer