[BUG] continuous Vite HMR reload loop on external volumes

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Vite detects file changes on every file Claude Code writes/indexes to when on external volume, causing an infinite reload loop (every 20 - 30 seconds).

What Should Happen?

Claude writes to the file and Vite reloads once as normal.

Error Messages/Logs

3:00:01 PM [vite] (client) hmr update /src/components/EmailCreateDialog.jsx, /src/components/RichTextEditor.jsx, /src/components/EmailThread.jsx, /src/components/Templates.jsx, /src/components/ContactDetail.jsx
  3:00:01 PM [vite] vite.config.js changed, restarting server...
  3:00:01 PM [vite] server restarted.

This repeats continuously every few seconds while Claude Code is open.

Steps to Reproduce

1. Have a Vite dev server running on an external/network volume
2. Open Claude Code in the same project directory
3. Have Claude write to a file Vite is watching eg vite.config.js
4. Vite immediately starts continuous HMR updates and config restarts
5. Close Claude Code → reloading stops
6. Reopen Claude Code → reloading resumes

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

v2.1.39

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="553" height="787" alt="Image" src="https://github.com/user-attachments/assets/74d284eb-080e-484a-9a16-7dc2c14d3817" />

Project is on an external volume mounted at /Volumes/{usr}/
Vite 7.3.1 with default fsevents watcher
Setting usePolling: false in Vite server config did not resolve the issue
The uvicorn backend I was using with --reload had the same issue (infinite restart loop) until --reload was removed