Describe the regression

The Vite build manifest normally includes which CSS a file uses. However, enabling experimental.enableNativePlugin causes this to no longer appear.

SvelteKit uses these CSS keys to map the CSS files between our server and client bundles so that we can choose to inline the server CSS instead of loading the client CSS. It's important to inline the server CSS and not the client CSS because it uses the correct path format for an inline style block when referencing other files.

Reproduction

https://github.com/eltigerchino/rolldown-vite-native-plugins-vite-manifest-css

Expected Behavior

I expected the css key to exist for entries in the Vite manifest.

Actual Behavior

The css key is missing from the Vite manifest.

Steps to Reproduce

1. Run pnpm i to install dependencies
2. Run pnpm build to generate the Vite manifest
3. Inspect the generated Vite manifest in ./dist/vite/manifest.json
4. Observe that the index.html file's css key specifies the CSS files it uses.
5. Now, install rolldown-vite by adding the below to the ./package.json

  "pnpm": {
    "overrides": {
      "vite": "npm:rolldown-vite@latest"
    }
  }

6. Run pnpm i to install rolldown-vite
7. Run pnpm build to generate the Vite manifest
8. Observe that the index.html entry no longer has a css key.

System Info

System:
    OS: Linux 5.15 Ubuntu 22.04.5 LTS 22.04.5 LTS (Jammy Jellyfish)
    CPU: (8) x64 AMD Ryzen 7 5800H with Radeon Graphics
    Memory: 11.27 GB / 15.62 GB
    Container: Yes
    Shell: 5.8.1 - /usr/bin/zsh
  Binaries:
    Node: 20.19.3 - ~/.volta/tools/image/node/20.19.3/bin/node
    npm: 10.8.2 - ~/.volta/tools/image/node/20.19.3/bin/npm
    pnpm: 10.12.4 - ~/.volta/tools/image/pnpm/10.12.4/bin/pnpm
    bun: 1.2.15 - ~/.bun/bin/bun
  Browsers:
    Chrome: 138.0.7204.100
  npmPackages:
    vite: ^7.0.3 => 7.0.3

Used Package Manager

pnpm

Logs

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs and the Rolldown-related guide.
• Check that there isn't already an issue that reports the same regression to avoid creating a duplicate.
• Check that this is a concrete regression. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the regression.