| title: CSS Modules Imported by a Dependency | |
| ## Why This Error Occurred | |
| One of your dependencies (`node_modules`) imports a CSS Modules file. | |
| This normally happens when a package's source files are accidentally consumed, | |
| instead of the built package. | |
| ## Possible Ways to Fix It | |
| Reach out to the maintainer and ask for them to publish a compiled version of | |
| their dependency. | |
| Compiled dependencies do not have references to CSS Module files, or any other | |
| files that require bundler-specific integrations. | |
| The dependency should also provide instructions about what CSS needs to be | |
| imported by you, in your application. | |
| If this is **first-party code**, try [including monorepo packages in the compilation pipeline](/docs/architecture/nextjs-compiler#module-transpilation). | |
| > **Good to know**: This limitation does not exist when using the App Router. | |