HMR not working in CSS Modules dependency

[privatenumber]

Describe the bug

When updating a composed CSS Module file, HMR doesn't get triggered. Since the file change isn't detected, refreshing the page doesn't work either—the server must be restarted.

This is fixed by #16018, but wanted to file it for tracking purposes since this seems like a pretty major issue that wasn't reported.

Reproduction

https://stackblitz.com/edit/vitejs-vite-npddeu?file=src%2Fstyle.module.css,src%2Futils.module.css

Steps to reproduce

1. In style.module.css, uncomment L5 to confirm HMR works in an entry CSS Module file
2. In utils.module.css, uncomment L4 to see that HMR does not get triggered
3. Refresh the page to see that doesn't work either. Server must be restarted

System Info

N/A

Used Package Manager

npm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[stackblitz]

Start a new pull request in StackBlitz Codeflow.

• vitejs-vite-npddeu (Open reproduction)

[privatenumber]

This is fixed via https://github.com/privatenumber/vite-css-modules but will keep this open until fixed in Vite