Identify all instances of useSelect

Oct 13, 2025 by wbrum.org 30 views

Introduction

WordPress 6.8 has introduced a new feature that provides a helpful performance warning for developers in the useSelect hook. This warning is triggered when the useSelect hook returns different values when called with the same state and parameters. This can lead to unnecessary re-renders and performance issues if not fixed. In this article, we will discuss the issue, its implications, and provide a step-by-step guide on how to audit and fix any direct data manipulation within useSelect in WordPress 6.8.

Understanding the Issue

The issue arises from the fact that useSelect is a hook that returns different values when called with the same state and parameters. This can happen when new references are being created, which can lead to unnecessary re-renders and performance issues. The warning message is triggered when script debug is enabled, and it looks like this:

The `useSelect` hook returns different values when called with the same state and parameters.

This warning is a helpful performance warning for developers, as it indicates that there is a potential issue with the code that needs to be addressed.

Implications of the Issue

The implications of this issue are significant, as it can lead to unnecessary re-renders and performance issues. Re-renders can be costly, especially in complex applications with many components. They can also lead to a poor user experience, as the application may become unresponsive or slow.

Auditing useSelect in the Monorepo

To audit useSelect in the monorepo, we need to follow these steps:

Identify all instances of useSelect: We need to identify all instances of useSelect in the monorepo. This can be done by searching for the useSelect hook in the codebase.
Check for direct data manipulation: We need to check if any of the instances of useSelect are performing direct data manipulation. This can be done by checking if the useSelect hook is being used to update the state of the component.
Modify instances of useSelect: If we find any instances of useSelect that are performing direct data manipulation, we need to modify them to use the useDispatch hook instead.

Modifying Instances of useSelect

To modify instances of useSelect, we need to follow these steps:

Use the useDispatch hook: We need to use the useDispatch hook to dispatch an action to update the state of the component.
Remove direct data manipulation: We need to remove any direct data manipulation from the useSelect hook.
Test the code: We need to test the code to ensure that it is working as expected.

Example Use Case

Here is an example use case of how to modify an instance of useSelect:

// Before
import { useSelect } from '@wordpress/data';
import { store } from './store';

const { select } = useSelect({
  select: (select) => select(store, 'getItems'),
});

// After
import { useDispatch } from '@wordpress/data';
import { store } from './store';

const dispatch = useDispatch(store);

const { items } = dispatch('getItems');

In this example, we have modified the instance of useSelect to use the useDispatch hook instead. We have also removed any direct data manipulation from the useSelect hook.

Conclusion

In conclusion, the useSelect hook in WordPress 6.8 has introduced a new feature that provides a helpful performance warning for developers. This warning is triggered when the useSelect hook returns different values when called with the same state and parameters. To fix this issue, we need to audit useSelect in the monorepo and modify any instances that are performing direct data manipulation. We can do this by using the useDispatch hook instead of useSelect. By following these steps, we can ensure that our code is working as expected and that we are not experiencing any performance issues.

Additional Resources

For more information on this issue, please refer to the following resources:

Frequently Asked Questions

Q: What is the useSelect hook? A: The useSelect hook is a hook that returns different values when called with the same state and parameters.

Q: What is the issue with the useSelect hook? A: The issue with the useSelect hook is that it returns different values when called with the same state and parameters, which can lead to unnecessary re-renders and performance issues.

Introduction

In our previous article, we discussed the issue with the useSelect hook in WordPress 6.8 and provided a step-by-step guide on how to audit and fix any direct data manipulation within useSelect. In this article, we will answer some frequently asked questions (FAQs) related to the useSelect hook and provide additional information to help developers understand and fix the issue.

Q&A

Q: What is the useSelect hook? A: The useSelect hook is a hook that returns different values when called with the same state and parameters. It is used to select data from the WordPress data store.

Q: How do I fix the issue with the useSelect hook? A: To fix the issue with the useSelect hook, you need to audit useSelect in the monorepo and modify any instances that are performing direct data manipulation. You can do this by using the useDispatch hook instead of useSelect.

Q: What is the useDispatch hook? A: The useDispatch hook is a hook that allows you to dispatch an action to update the state of the component. It is used to replace the useSelect hook in cases where direct data manipulation is being performed.

Q: How do I use the useDispatch hook? A: To use the useDispatch hook, you need to import it from the @wordpress/data module and then use it to dispatch an action to update the state of the component.

Q: What are the benefits of using the useDispatch hook? A: The benefits of using the useDispatch hook include:

Improved performance: By avoiding direct data manipulation, you can improve the performance of your application.
Simplified code: The useDispatch hook can simplify your code by reducing the need for complex data manipulation logic.
Better maintainability: The useDispatch hook can make your code more maintainable by reducing the risk of bugs and errors.

Q: What are the common mistakes to avoid when using the useSelect hook? A: Some common mistakes to avoid when using the useSelect hook include:

Direct data manipulation: Avoid performing direct data manipulation within the useSelect hook.
Unnecessary re-renders: Avoid causing unnecessary re-renders by using the useDispatch hook instead of useSelect.
Complex data manipulation logic: Avoid using complex data manipulation logic within the useSelect hook.

Q: How do I test my code to ensure it is working correctly? A: To test your code to ensure it is working correctly, you can use the following steps:

Verify the output: Verify that the output of your code is correct and matches the expected output.
Check for errors: Check for any errors or warnings in your code.
Test for performance: Test your code for performance issues and ensure that it is working efficiently.

Conclusion

In conclusion, the useSelect hook in WordPress 6.8 has introduced a new feature that provides a helpful performance warning for developers. This warning is triggered when the useSelect hook returns different values when called with the same state and parameters. To fix this issue, you need to audit useSelect in the monorepo and modify any instances that are performing direct data manipulation. You can do this by using the useDispatch hook instead of useSelect. By following these steps, you can ensure that your code is working as expected and that you are not experiencing any performance issues.

Additional Resources

For more information on this issue, please refer to the following resources:

Frequently Asked Questions

Q: What is the useSelect hook? A: The useSelect hook is a hook that returns different values when called with the same state and parameters.