HMR / React Fast Refresh not working in microfrontend setup when using react-swc

[gursimranjitsingh-web]

Related plugins

• plugin-react

• plugin-react-swc

• plugin-react-oxc

• plugin-rsc

Describe the bug

In a microfrontend architecture, Hot Module Replacement (HMR) and React Fast Refresh stop working when the microfrontends use react-swc (or any SWC-based React transform such as @vitejs/plugin-react-swc, @swc/loader, or SWC inside a custom build setup). The same architecture works correctly with Babel-based React Refresh.

Reproduction

https://github.com/vitejs/vite-plugin-react/

Steps to reproduce

No response

System Info

System:
    OS: macOS 26.1
    CPU: (8) arm64 Apple M3
    Memory: 68.77 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.11.0 - /usr/local/bin/node
    npm: 11.6.1 - /usr/local/bin/npm
  Browsers:
    Chrome: 142.0.7444.176
    Safari: 26.1
  npmPackages:
    @vitejs/plugin-react-swc: ^4.2.1 => 4.2.2 
    vite: ^7.2.2 => 7.2.2

Used Package Manager

npm

Logs

No response

Validations

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• 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.
• 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.

[github-actions]

Hello @gursimranjitsingh-web. Please provide a minimal reproduction using a GitHub repository or StackBlitz. Issues marked with need reproduction will be closed if they have no activity within 3 days.