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This blog post provides a step-by-step guide on how to use Sass with CSS Modules in a Next.js app. It begins by defining what CSS Modules and Sass are, and then explains how to install and configure Sass in a new Next.js app. The post covers how to import Sass files into a Next.js app, use Sass variables in styles, and use Sass mixins with global imports in Next.js. By the end of the post, readers will have a solid understanding of how to use Sass with CSS Modules in a Next.js app, which will help them write more modular, organized, and reusable styles.

Table of Contents:

1. Introduction
2. What are CSS Modules?
3. What is Sass?
4. What are we going to build?
5. Step 0: Creating a new Next.js app
6. Step 1: Installing Sass in a Next.js app
7. Step 2: Importing Sass files into a Next.js app
8. Step 3: Using Sass variables in a Next.js app
9. Step 4: Using Sass mixins with global imports in Next.js
10. Conclusion

CSS Modules are a way to modularize your CSS code, ensuring that your styles don't leak outside of their intended scope. They work by generating unique class names for each component, preventing class name collisions and allowing you to write CSS without worrying about global scope or naming conflicts. For example, let's say you have two components in your app: a header and a footer. Without CSS Modules, you might write CSS like this:

.header {
  background-color: blue;
}

.footer {
  background-color: red;
}

/* your code */