UnableToResolveError: Unable to Resolve Module `AccessibilityInfo`

Encountering the UnableToResolveError when working with React Native can be frustrating, especially if you're new to mobile app development. This error typically occurs when the system can't find a specific module it needs to run your app. In this case, the module in question is AccessibilityInfo, which is part of React Native's core library used to manage accessibility features in your app.

The problem

When you try to start your React Native app, you might see an error message like this:

error: bundling: UnableToResolveError: Unable to resolve module `AccessibilityInfo` from `/path/to/your/project/node_modules/react-native/Libraries/react-native/react-native-implementation.js`: Module does not exist in the module map or in these directories: /path/to/your/project/node_modules/react-native/node_modules , /path/to/your/project/node_modules

This error indicates that the system can't find the AccessibilityInfo module in the expected locations. This can prevent your app from running, leaving you stuck at the starting line.

Why it happens

This issue often arises due to a mismatch between the version of React Native you're using and the modules your project depends on. In plain English, your app is looking for a module that isn't where it expects it to be, often because your project setup is outdated or misconfigured.

React Native frequently updates its core libraries, and older versions might not include certain modules or might reference them differently. If your project is using an older version of React Native, like 0.44.0, it may not be compatible with newer module structures.

The fix

To resolve this error, follow these steps:

1. Update React Native: Ensure you're using a compatible version of React Native. Run npm install react-native@latest or yarn add react-native@latest to update to the latest version.
2. Check your package.json: Make sure all dependencies are compatible with your React Native version. Update any outdated packages by running npm update or yarn upgrade.
3. Clear caches: Sometimes, cached files can cause issues. Clear caches by running:

   watchman watch-del-all
   rm -rf node_modules
   npm cache clean --force
   rm -rf /tmp/metro-bundler-cache-*
   rm -rf /tmp/haste-map-*
   yarn cache clean
   

4. Reinstall node modules: After clearing caches, reinstall your node modules with npm install or yarn install.
5. Restart the packager: Finally, restart the React Native packager by running npm start -- --reset-cache or yarn start --reset-cache.

These steps should help you resolve the error and get your app running smoothly again.

Action checklist

• Update React Native to the latest version.
• Ensure all dependencies are up-to-date.
• Clear all caches to remove outdated files.
• Reinstall node modules to ensure fresh copies.
• Restart the packager with cache reset.

When it does not apply

If you've followed these steps and still encounter the issue, it might be due to a different problem. Check if the AccessibilityInfo module is correctly imported in your code. Also, ensure that your development environment (like Xcode or Android Studio) is correctly set up and updated.

For more complex issues, consider reaching out to the React Native community or checking more detailed documentation on module resolution.