chore: use types from Vite

[sapphi-red]

Description

Use types from vite rather than from rolldown.

Motivation and Context

rolldown is not a dependency / devDeps of this package and is not always possible to import depending on the package manager's behavior. On ecosystem-ci, vite is resolved to the local vite so node_modules/rolldown will not be created by npm, thus the type fails to resolve.
https://github.com/vitejs/vite-ecosystem-ci/actions/runs/27599464088/job/81596799094
This PR would fix the error above by using the types re-exported from vite.

Screenshots (if appropriate):

Checklist:

• I have updated/added documentation affected by my changes. (it's an internal change)
• I have added tests to cover my changes. (ecosystem-ci is the tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1581111

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Plan: Pro

Run ID: fb982eaf-3f46-41f7-a3f0-a0e3c375f0da

📥 Commits

Reviewing files that changed from the base of the PR and between bcaf9bf and 1581111.

📒 Files selected for processing (1)

• src/rolldown-plugin.ts

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Walkthrough

In src/rolldown-plugin.ts, the type import from the rolldown package (Plugin, ModuleType) is replaced with a single Rolldown namespace import from vite. The exported rolldownPlugin function's return type changes from Plugin[] to Rolldown.Plugin[], and the virtual module's moduleType cast changes from ModuleType to Rolldown.ModuleType.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: use types from Vite' is clear and directly describes the main change—switching type imports from rolldown to Vite.
Description check	✅ Passed	The description explains the motivation, context, and solution related to the changeset, detailing why types need to be imported from vite instead of rolldown.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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[DylanPiercey]

Appreciate the PR, thanks!