[Bug]: "getComputedStyle is not defined" using css experiment field set to true on SSR

[JSMD-maintainers]

System Info

System:
OS: macOS 14.6
CPU: (10) arm64 Apple M1 Pro
Memory: 218.47 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 18.18.2 - ~/.nvm/versions/node/v18.18.2/bin/node
npm: 10.8.3 - ~/.nvm/versions/node/v18.18.2/bin/npm
pnpm: 6.35.1 - ~/.nvm/versions/node/v18.18.2/bin/pnpm
bun: 1.1.12 - /opt/homebrew/bin/bun
Browsers:
Chrome: 129.0.6668.90
Safari: 17.6
npmPackages:
@rspack/cli: ^1.0.0 => 1.0.0
@rspack/core: ^1.0.0 => 1.0.0

Details

When using the native css support it seems that SSR is not working in the sense that the application is responding with an error:

// Error
{
"statusCode": 500,
"error": "Internal Server Error",
"message": "getComputedStyle is not defined"
}

I am following the this section of the docs: https://rspack.dev/guide/tech/css#sass

Expected behaviour:
Using css should not lead to an error. If you remove the css file and the css import in the App.jsx the app is running fine.

Reproduce link

https://github.com/MarcoLeko/rspack-can-not-read-property-of-undefined

Reproduce Steps

1. Run npm ci
2. Run npm run rspack:dev:server
3. Check out: http://localhost:3001/