Errors are missing `plugin` field

[benmccann]

Describe the regression

See this simple test: https://github.com/JonasKruckenberg/imagetools/blob/74df03b9a38b15279dd5a0aac05b1f41a941d545/packages/vite/src/__tests__/main.test.ts#L304

  FAIL  src/__tests__/main.test.ts > vite-imagetools > options > logging > logs error messages through rollup
│ AssertionError: expected undefined to deeply equal 'imagetools'
│ - Expected: 
│ "imagetools"
│ + Received: 
│ undefined
│  ❯ src/__tests__/main.test.ts:304:28
│     302|         } catch (err: unknown) {
│     303|           const e = err as { plugin: string; message: string }
│     304|           expect(e.plugin).toEqual('imagetools')
│        |                            ^
│     305|           expect(e.message).toContain('An error')
│     306|         }
│

Reproduction

https://github.com/JonasKruckenberg/imagetools

Expected Behavior

The error's plugin field should contain the name of the plugin

Actual Behavior

The error's plugin field is undefined

Steps to Reproduce

git clone git@github.com:JonasKruckenberg/imagetools.git
cd imagetools
pnpm install
pnpm -r update vite@8.0.0-beta.15
pnpm build
pnpm test

System Info

vite@8.0.0-beta.15

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.

[sapphi-red]

Rolldown throws an error that contains the list of errors, unlike Rollup.
You can access the individual errors from .errors. For this case, I guess e[0].plugin should return the value.

Side note: the document was incorrect and it will be fixed by rolldown/rolldown#8490