Скачать или смотреть How to Solve the zone.js cannot be resolved Error in Angular Projects

Discover how to fix the `zone.js cannot be resolved` error in your Angular application after upgrading your Angular CLI. Learn the step-by-step process to get your project back on track.
---
This video is based on the question https://stackoverflow.com/q/69141989/ asked by the user 'Reem Al-Assaf' ( https://stackoverflow.com/u/13380654/ ) and on the answer https://stackoverflow.com/a/69144311/ provided by the user 'Sumit' ( https://stackoverflow.com/u/10883832/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: zone.js cannot be resolved

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Solve the zone.js cannot be resolved Error in Angular Projects

Upgrading to the latest Angular CLI can sometimes lead to frustrating errors, one of which is the common zone.js cannot be resolved error. If you're encountering this issue when trying to run your Angular application with the command ng serve, don’t worry; you're not alone. This error often arises from a missing package or dependencies that haven’t updated correctly during the upgrade.

In this guide, we'll delve into what causes this error and provide a straightforward solution to get your Angular project up and running again.

Understanding the Problem

When you run the ng serve command after upgrading your Angular CLI, you may see an error message like this:

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

This error indicates that the Angular build process is struggling to find the zone.js/plugins/zone-legacy module, which is typically required for Angular's change detection mechanism to function properly.

Why Does This Happen?

Common reasons behind this error include:

Missing or outdated dependencies in your project.

Incorrect configurations or paths in your build settings.

Unresolved issues during the upgrade process of Angular or its related packages.

Solution Steps

To fix the zone.js cannot be resolved error, follow these organized steps:

Step 1: Remove the Node Modules

Begin by deleting the node_modules folder from your project. This action clears out existing packages and caches that might be causing conflicts.

Navigate to your project directory and run:

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

Step 2: Delete the Package Lock File

Next, you should also remove the package-lock.json file. This file locks the versions of your packages, which may lead to issues if the dependencies' structure has changed during the upgrade.

Delete the file with the following command:

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

Step 3: Reinstall Angular CLI

To ensure that you have the latest version of Angular CLI installed, run the installation command:

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

Step 4: Install Dependencies

Once the CLI is updated, you need to reinstall your project’s dependencies. Use the following command to do so:

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

Step 5: Run the Application

Now that your dependencies are properly set up, try starting your Angular application again with:

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

Conclusion

Encountering the zone.js cannot be resolved error after an Angular CLI upgrade can be irritating, but it’s often a fixable issue. By following the steps outlined above, you should be able to resolve the issue and get back to developing your Angular application without further hindrances.

If you continue to experience problems, consider checking your configuration files and ensuring all related packages are compatible with your new Angular version. Happy coding!