Скачать или смотреть Accessing the Vue 3 App Instance API from Non-Vue Files

Discover how to access the `app.config.globalProperties` in Vue 3 from external JS files, including tips on defining plugins and exporting app instances.
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Accessing the Vue 3 App Instance API from Non-Vue Files: A Comprehensive Guide

Working with Vue 3 comes with its own set of challenges, especially when trying to integrate functionalities from external JavaScript files. If you’ve previously worked with Vue 2, you might recall accessing the global API through the Vue instance. In Vue 3, however, the approach has shifted — the app instance is now more encapsulated. This guide will walk you through the steps to access app.config.globalProperties from a non-Vue file, like helper.js.

The Problem: Accessing the Vue 3 App Instance

In Vue 2, accessing the global properties was straightforward using Vue.prototype, but Vue 3 structures things differently by utilizing the app instance. Here's a breakdown of the challenge:

Vue 2 Method: Access to global properties was done via Vue.prototype.$auth.

Vue 3 Method: These properties are encapsulated in the app instance which primarily exists in main.js.

The question arises: How do you access app.config.globalProperties.$auth from a non-Vue file like helper.js? Let’s explore some viable solutions.

Solutions to Accessing the App Instance API

1. Define a Plugin

One of the most effective methods is to define a plugin that will extend the app instance with the necessary global properties. Here’s how you can do that:

Step-by-Step Instructions

Create a plugin file: Create a file named auth.js in your plugins directory.

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Register the plugin in main.js: Import and use your newly created plugin in your main application file.

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With this setup, $auth will now be available globally within your Vue components and can be utilized as necessary.

2. Export the App Instance

Another approach is to directly export the app instance from main.js and import it in your helper.js file.

Step-by-Step Instructions

Export the app instance: At the end of your main.js file, make sure to export the app instance.

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Import the app in helper.js:

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This method gives you direct access to the app instance and its configurations, allowing you to call $auth and any other global properties as needed.

3. Pass Variables to Helper Functions

If exporting the app instance doesn't quite suit your needs, consider passing the global variable directly when you call the helper function from your components.

Example:

In your component, you might do something like this:

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This way, you’re explicitly passing along any necessary variables the helper function requires when it is invoked.

Conclusion

Accessing the Vue 3 app instance API from non-Vue files isn't as daunting as it may initially seem. Whether you decide to create a plugin, export the app instance, or pass global variables directly, each approach has its merits.

By incorporating these strategies, you can enable seamless integration of your Vue 3 app with external JavaScript functionalities, ensuring a smoother development process and enhanced application capabilities.

Feel free to experiment with these methods to find the one that best fits your project's architecture and coding preferences. Happy coding!