Solving the SassError: Undefined variable: '$bg-color' Error in React

Learn how to fix the common `SassError` in React projects by correctly using SCSS variables. This guide will help you understand variable scope and show practical examples.
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Introduction

If you're working with React and Sass, you might have run into the frustrating SassError: Undefined variable: "$bg-color" message. It's a common issue that can halt your development process and leave you scratching your head. In this post, we'll break down why this error occurs and how to resolve it, so you can get back to building your application seamlessly.

Understanding the Issue

The error message you've encountered specifically occurs when Sass cannot find the variable you've referenced—in this case, $bg-color. Here’s a brief summary of the steps that lead to this error message in your code:

You create a new React application and install node-sass for Sass support.

You structured your SCSS files but ended up with an undefined variable error.

Example Code Structure

To clarify, here is a simplified version of your files:

The Solution

To resolve the SassError, you'll need to ensure that your variables are correctly imported and available in the scope of your SCSS files. Below, we explore two effective solutions.

1. Correctly Import SCSS Files

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

With this import statement, you explicitly bring in the variable's definition before using it in your styles.

2. Use CSS Custom Properties

If you want to avoid potential import-related issues altogether or just prefer a more modern approach, you can utilize CSS Custom Properties (variables). Here’s how you can set that up:

Step 1: Define the CSS Variable

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

Step 2: Use the CSS Variable in your SCSS

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

This method prevents issues with imports because the CSS variable is available globally.

Conclusion

Dealing with the SassError: Undefined variable: "$bg-color" error can be challenging, especially if you aren't familiar with variable scope and imports in Sass. Remember:

Import your variables: Always import your variable files in the SCSS files where you need to use them.

Consider CSS Variables: They offer a modern and often simpler way to manage styling without worrying about the import chain.

By following these guidelines, you should be able to resolve the error and keep your React application styling in good shape. Happy coding!