Скачать или смотреть Resolving Failed to Load Plugin 'testing-library' Error in ReactJS Step-by-Step

Learn how to troubleshoot the `Failed to load plugin 'testing-library'` error in ReactJS by properly reinstalling your dependencies while avoiding common pitfalls.
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This video is based on the question https://stackoverflow.com/q/69857956/ asked by the user 'Himanshu Poddar' ( https://stackoverflow.com/u/10216112/ ) and on the answer https://stackoverflow.com/a/69863194/ provided by the user 'Mario Beltrán' ( https://stackoverflow.com/u/6278737/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the Failed to Load Plugin 'testing-library' Error in ReactJS

If you're working on a ReactJS project and have recently transferred your codebase from one device to another, you might encounter a frustrating error when you try to start your application. Specifically, you could see an error message indicating a failure to load the testing-library plugin declared in your package.json. This common issue often arises when the node_modules folder is copied incorrectly between devices. Fear not! In this post, we'll break down the problem and provide a simple solution to get your React app running smoothly again.

Understanding the Problem

The error message may look something like this:

[[See Video to Reveal this Text or Code Snippet]]

What this means is that the ESLint plugin you're trying to use has not been properly initialized. This can stem from copying the node_modules folder directly, which can lead to version mismatches or missing dependencies.

Why You Should Avoid Copying node_modules

Environment Differences: Each development environment may have different versions of dependencies, leading to potential conflicts.

Incomplete Packages: The node_modules folder can contain a lot of nested dependencies that may not copy over correctly, resulting in missing modules.

Caching Issues: Some modules may rely on cached data that won’t transfer when copying manually.

Solution: Reinstalling Your Dependencies

Step 1: Delete node_modules

First, you need to delete the node_modules folder in your project directory. You can do this manually in your file explorer or via the command line:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Clear Your Cache (Optional but Recommended)

After removing node_modules, it’s a good idea to clear your npm cache to ensure that old or corrupted files don’t interfere with the reinstallation. You can clear the npm cache with the following command:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Reinstall the Dependencies

Next, reinstall your project's dependencies by running:

[[See Video to Reveal this Text or Code Snippet]]

This command will re-download all the packages listed in your package.json, ensuring that you have the correct versions and all necessary files.

Step 4: Start Your App Again

Finally, after the installation completes, try starting your app again with:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

If you've followed these steps, you should no longer see the error regarding the testing-library. Copying node_modules can lead to various issues, but by properly reinstalling your dependencies through npm, you keep your project's environment clean and manageable.

If you still encounter problems after this, consider checking your package.json for other potential discrepancies or outdated packages.

Remember, handling dependencies effectively is crucial to maintaining a smooth development workflow. Happy coding!