Скачать или смотреть Fixing the Migration failed: Package "@ angular/core" was not found Error During Angular Upgrade

Struggling with the Angular migration error "Package '@ angular/core' was not found on the registry"? This detailed guide provides step-by-step solutions to resolve this issue and successfully upgrade to Angular 10.
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Resolving the Angular Upgrade Migration Error

Upgrading your Angular application can often bring substantial improvements and new features. However, sometimes you may run into roadblocks along the way. One common issue developers face is the error stating that the Package "@ angular/core" was not found on the registry. This can halt your migration process and prevent you from enjoying the benefits of the latest Angular version.

The Problem Explained

If you're trying to update from Angular 9 to Angular 10 and encounter the following error:

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

This indicates that the npm package manager is having trouble locating the @ angular/core package during the update process, which is crucial for Angular applications.

Steps to Resolve the Error

Fortunately, this issue can usually be resolved with some straightforward steps. Here’s how you can troubleshoot and overcome it:

Step 1: Clear npm Cache

Sometimes npm’s cache can become corrupted, leading to package resolution errors. Use the following command to clean the cache:

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Step 2: Delete the node_modules Folder

Deleting the current installation of your project’s dependencies can help reset any stale data. Navigate to your project directory and remove the node_modules folder:

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On Windows, you can simply delete the folder using File Explorer or run:

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Step 3: Reinstall Dependencies

After clearing the cache and deleting the node_modules folder, reinstall the project dependencies using:

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

Step 4: Force the Angular Update

Once everything is fresh and clean, you can attempt to update Angular again. Use the following command to force the update of @ angular/core:

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

Final Check

After successfully completing these steps, ensure everything is functioning correctly. Run your application to verify that it loads without any errors:

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Conclusion

Encountering the Package "@ angular/core" was not found migration error can be frustrating, but with the steps outlined above, you should be able to resolve the issue effectively. Regularly updating your dependencies and cleaning your npm cache can help prevent similar problems in the future. Happy coding!