Скачать или смотреть Fixing the Vue.extend is not a function Error in Vue 3 Migration

Learn how to troubleshoot the `Uncaught TypeError: Vue.extend is not a function` error after migrating to Vue 3 and ensure your application runs smoothly.
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This video is based on the question https://stackoverflow.com/q/71865145/ asked by the user 'has1234513' ( https://stackoverflow.com/u/13993445/ ) and on the answer https://stackoverflow.com/a/71866592/ provided by the user 'Daniel Storey' ( https://stackoverflow.com/u/3428475/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the Vue.extend is not a function Error in Vue 3

Have you recently migrated your Vue application from Vue 2 to Vue 3 and encountered a baffling error? If the error message Uncaught TypeError: Vue.extend is not a function is troubling you, you’re not alone. This is a common issue that can arise during migration, and understanding why it happens and how to resolve it is crucial for smoothly transitioning your application. Let’s dive into the details!

Understanding the Error

In Vue 2, the function Vue.extend() was utilized to create a subclass of the Vue base class. However, with the groundbreaking updates in Vue 3, this method was removed. As a result, if your application or any of the plugins you’re using still reference Vue.extend, you will encounter this error upon loading your application. The key takeaway here is that one of your plugins is likely trying to use a deprecated function.

Step-by-Step Solutions to the Issue

To resolve the Uncaught TypeError: Vue.extend is not a function error, follow these steps:

1. Identify the Plugin Causing the Issue

The first step is to pinpoint which plugin is still dependent on Vue.extend. Here’s how to go about it:

Check the Error Stack Trace: When the error occurs in the console, it may provide a stack trace. Look for paths that lead to the plugin causing the issue. If the stack trace does not help, proceed to the next step.

Remove All Plugins: Temporarily comment out or remove all plugins from your main.js file. This will help you identify whether the problem is indeed with a plugin or if it lies elsewhere.

2. Add Plugins Back One by One

Once you've removed all plugins, begin adding them back into your project one at a time. After each addition:

Test Your Application: Check for the error message in your console. If the error reappears after adding a specific plugin, that plugin is likely incompatible with Vue 3.

3. Update Incompatible Plugins

In many cases, when you find the plugin causing the error, you may be able to fix the issue by:

Checking for Updated Versions: Look for newer versions of the plugin that have been updated for compatibility with Vue 3. This information can often be found on the plugin’s documentation or repository page.

Replacing the Plugin: If the plugin does not have an updated version and is critical to your application, consider looking for alternative plugins that offer similar functionality and are compatible with Vue 3.

4. Example Case

In your specific instance, your plugin list includes various components:

vue-axios

vuex

vue-router

v-clipboard

v-idle

It’s worth checking whether these plugins have been updated to work with Vue 3, as some of them may still have remnants of Vue 2 codebases.

Final Thoughts

Migrating to Vue 3 opens up a world of new features and improvements, but it’s essential to address deprecated functions and incompatible plugins. By following the outlined steps above, you can easily troubleshoot and resolve the Uncaught TypeError: Vue.extend is not a function error, ensuring your application runs smoothly in its new environment. Don’t forget to keep your plugins updated for a seamless development experience!

If you have any further questions or need additional assistance, feel free to reach out. Happy coding!