Error: Unable to locate module: Unable to resolve './Page.module.css' in Next.js version 13

When I run npm run build on Vercel and Heroku, I encounter an error that does not occur on my local computer:

The error message is 

Module not found: Can't resolve './Page.module.css'

I am trying to import this file from app/page.tsx, and both files are located in the same directory with matching cases. Here is a screenshot for reference:

The line in page.tsx causing the issue is:

'use client'
import styles from "./Page.module.css"

The next.config.js file only contains environment variables. The package.json and webpack settings remain untouched.

javascriptherokuwebpacknext.jsvercel

Answer №1

Check out this helpful resource on resolving a 'module not found' error: How do I resolve a 'module not found' error?

An issue that may cause this error is the difference in filesystem sensitivity between your local machine and Vercel deployments. While some filesystems are case-insensitive, Vercel uses a case-sensitive filesystem. When you change filenames' letter casing locally, Git might only detect changes in import statements, leading to syntax errors in your repository upon deployment to Vercel.

If you're using git, remember to run the following command in your environment:

git config core.ignorecase false

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