fix(incremental): resolve asset placeholders in modules or compiled CSS

[adamchal]

Changes

• Resolves asset placeholders before hashing compiled CSS, preventing unchanged pages from being rebuilt.
• Adds support for Rolldown’s import.meta.ROLLDOWN_FILE_URL_* asset references.

Testing

• Adds coverage confirming hashes stay stable when Rolldown assigns different handles to the same assets.
• Adds coverage confirming compiled CSS asset-handle changes do not trigger unnecessary rebuilds.

Docs

N/a — fixes expected behavior

Closes #18058

[changeset-bot]

🦋 Changeset detected

Latest commit: 95d6a09

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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[adamchal]

@matthewp this expands factory-bot’s #18062 to include stabilizing import.meta.ROLLDOWN_FILE_URL_*.

Something like this would also invalidate on rebuilds:

---
import fontUrl from '../../assets/example.woff2?url';

export function getStaticPaths() {
  return [
    {
      params: { slug: 'example' },
      cacheKey: 'unchanged-v1',
    },
  ];
}
---

<link rel="preload" href={fontUrl} as="font" />

This looks safe to me, but wanted to make sure nothing jumps out at you about stabilizing these references.

[codspeed]

Merging this PR will not alter performance

✅ 21 untouched benchmarks

---

_{Comparing adamchal/fix-18058 (95d6a09) with main (cf5d72f)¹}

Footnotes

1. No successful run was found on main (db2eaf1) during the generation of this report, so cf5d72f was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩