Скачать или смотреть Solving the Next.js CSS Module Not Included in React Component Issue

A guide to troubleshoot and fix issues with `CSS Modules` not applying in `Next.js` React components. Discover the key factors affecting style application and learn how to implement CSS modules correctly.
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Solving the Next.js CSS Module Not Included in React Component Issue

If you're working with Next.js and running into problems where styles from a CSS module are not being applied to your React components, you're not alone! This common issue can be frustrating, especially when you've followed the documentation closely. In this post, we'll break down the problem and provide a clear solution to ensure your CSS styles are correctly applied to your components.

Understanding the Problem

You have a React component that imports styles from a CSS module, but those styles do not seem to appear in your application. From your code, it appears you're trying to apply styles to a Toolbar component but with no success. Here’s a brief look at the relevant parts of your code:

Toolbar Component (Toolbar.tsx)

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

CSS Module (Toolbar.module.css)

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

In the above code, you'll notice the mismatch between the naming conventions used in your CSS file and your React component.

The Solution

To resolve the issue of the CSS not being applied, you need to ensure consistency between your React component and your CSS module. Here are the steps to fix the problem:

1. Class Name Consistency

The class names you use in your CSS must match the names you are importing into your React component. In this case:

Change CSS class name in Toolbar.module.css from:

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

to:

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

2. Code Adjustments

Make sure that your React component is referencing this updated class name:

In your Toolbar.tsx update the className like so:

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

3. Understanding Class Names

To further clarify:

Class names defined in CSS can use hyphens (e.g., .toolbar-container), but that syntax is not directly usable in JavaScript due to naming conventions conflicting with the subtraction operator.

Always ensure that your JavaScript is using camelCase for class names imported from CSS modules (like toolbarContainer).

Examples

Working Example

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

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

Not Working Examples

If your Toolbar.tsx references:

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

Or if your CSS file has:

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

Conclusion

By ensuring that class names in your CSS modules accurately reflect those used in your React components, you'll prevent styling issues and ensure that your styles are applied seamlessly. With these adjustments, your Next.js application should now properly display the styles contained in your CSS modules. Happy coding!