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fix: correctly calculate @const blockers#18039

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Rich-Harris merged 3 commits into
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const-await-blockers-fix-alt
Apr 9, 2026
Merged

fix: correctly calculate @const blockers#18039
Rich-Harris merged 3 commits into
mainfrom
const-await-blockers-fix-alt

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@dummdidumm

@dummdidumm dummdidumm commented Mar 31, 2026

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Move the calculation of blockers into the analysis phase and then only push the right thunks in the transform phase - similar to how we already do it with top level $.run

Fixes #18024

The solution is a tiny bit brittle (not much more than the top level one we already have) and I tried to make it a bit more robust but ended up in a rabbit hole in #18032 - we can revisit that solution once all the old stuff is gone. Until then this is the most pragmatic/non-invasive change.

Move the calculation of blockers into the analysis phase and then only push the right thunks in the transform phase - similar to how we already do it with top level `$.run`

Fixes #18024
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🦋 Changeset detected

Latest commit: 01be319

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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svelte Patch

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pnpm add https://pkg.pr.new/svelte@18039

@Rich-Harris Rich-Harris merged commit 3937ec0 into main Apr 9, 2026
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@Rich-Harris Rich-Harris deleted the const-await-blockers-fix-alt branch April 9, 2026 18:21
@github-actions github-actions Bot mentioned this pull request Apr 8, 2026
Rich-Harris pushed a commit that referenced this pull request Apr 10, 2026
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to main, this PR will
be updated.


# Releases
## svelte@5.55.3

### Patch Changes

- fix: ensure proper HMR updates for dynamic components
([#18079](#18079))

- fix: correctly calculate `@const` blockers
([#18039](#18039))

- fix: freeze deriveds once their containing effects are destroyed
([#17921](#17921))

- fix: defer error boundary rendering in forks
([#18076](#18076))

- fix: avoid false positives for reactivity loss warning
([#18088](#18088))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
dummdidumm added a commit that referenced this pull request Apr 11, 2026
Regression from #18039 - we need to have each await expression (and waiting on blockers is one) in its own entry of `(renderer.)run`. Else context is not restored correctly and if the synchronous expression afterwards requires it stuff breaks.

Fixes #18098
dummdidumm added a commit that referenced this pull request Apr 13, 2026
…18100)

Regression from #18039 - we need to have each await expression (and
waiting on blockers is one) in its own entry of `(renderer.)run`. Else
context is not restored correctly and if the synchronous expression
afterwards requires it stuff breaks.

Fixes #18098
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Async Svelte crash in certain situations when destructuring awaited derived value in a @const

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