Dev server fails with "init_emotion_react_browser_development_esm" (8.0.14)

[tjfroll]

Describe the bug

After upgrading to Vite 8.0.14 (from 8.0.13), dev servers (vite) immediately fails in the browser with init_emotion_react_browser_development_esm - no stack trace. Disabling codeSplitting or downgrading to 8.0.13 resolves the issue.

A similar issue has been reported in Rolldown: rolldown/rolldown#9502

This is presumably related to our use of MaterialUI v5, which includes @emotion/react.

Reproduction

WIP

Steps to reproduce

On Vite 8.0.14 with @mui/material v5 and react >18 installed:

• Run vite dev
• Observe errors in browser logs

System Info

System:
    OS: macOS 26.3
    CPU: (12) arm64 Apple M2 Pro
    Memory: 106.17 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.14.1 - 
    npm: 11.11.0 - 
    pnpm: 11.1.2 - 
  Browsers:
    Chrome: 148.0.7778.179
    Firefox: 150.0.2
    Safari: 26.3

Used Package Manager

pnpm

Logs

Terminal

➜ pnpm vite dev
11:34:34 AM [vite] (client) Forced re-optimization of dependencies

  VITE v8.0.14  ready in 249 ms

  ➜  Local:   http://localhost:5173/app
  ➜  Network: use --host to expose
  ➜  press h + enter to show help
11:34:36 AM [vite] (client) [optimizer] bundling dependencies...

Browser

Uncaught ReferenceError: init_emotion_react_browser_development_esm is not defined
    at styles-Cj2gy6ID.js?v=84bd8baf:633:1

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.
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• The provided reproduction is a minimal reproducible example of the bug.

[maximilianschmid]

same here with VueJs 3.x latest