How to Properly Use Vuex in Your Vue3 Component with Typescript

Описание: Learn how to effectively utilize Vuex in your Vue 3 components with TypeScript by avoiding common pitfalls and using the Composition API correctly.
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This video is based on the question https://stackoverflow.com/q/67834953/ asked by the user 'Franz' ( https://stackoverflow.com/u/11549155/ ) and on the answer https://stackoverflow.com/a/67855308/ provided by the user 'tony19' ( https://stackoverflow.com/u/6277151/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Vuex in Vue3 with TypeScript: A Step-by-Step Guide

When developing applications with Vue 3 and TypeScript, integrating Vuex for state management can enhance your code's organization and maintainability. However, many developers face challenges when trying to connect Vuex stores within their components, especially when adopting the Composition API. In this guide, I'll address a common problem encountered while using Vuex in a Vue 3 component and provide a detailed solution.

The Problem

You’ve already set up a new Vue 3 project with TypeScript and added Vuex 4 for state management, but you’re experiencing an error in the browser’s console. The error message reads:

Uncaught (in promise) TypeError: Cannot read property 'parentNode' of null

This issue usually arises from conflicting usage of the Composition API and Options API, leading to improper store declarations within your component.

Understanding the Error

The error indicates that the Vuex store may not be correctly instantiated or accessed in your component. This often occurs due to:

Mixing APIs: Defining properties with the Options API (like data and computed) and properly accessing them with the Composition API inside setup().

Incorrect Store Reference: Returning the store improperly or not utilizing it as intended.

A Simple Solution

To effectively use Vuex with the Composition API in your Vue 3 component, follow these organized steps:

Step 1: Remove Conflicting Options

You should avoid mixing the Options API and Composition API within the same component. Specifically, remove any data and computed properties that may conflict with your Vuex store implementation. Here’s how your component should look:

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

Step 2: Explanation of the Code Changes

Define the Component: Use defineComponent from Vue to create your component.

Setup Function: This is where you integrate the store using the useStore function.

Reactive Properties: The computed function creates a reactive property called something, which retrieves data from the Vuex store through its getters.

Step 3: Ensure Store Configuration Is Correct

Check that your store is set up correctly in store.ts as follows:

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

Step 4: Verify Your Main Entry

Make sure your main entry file (main.ts) is also properly set up:

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

Conclusion

By adhering to the above recommendations, you can not only eliminate the error you're facing but also enhance the overall architecture of your application by embracing the Composition API in your Vue 3 components. Vuex is a powerful tool when used correctly, ensuring that your application remains organized and maintainable as it grows.

With these guidelines, you're now ready to leverage Vuex effectively in your Vue 3 applications using TypeScript. Happy coding!