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fix: ensure HMR wrapper forwards correct start/end nodes to active effect#17985

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Rich-Harris merged 2 commits into
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hmr-regression-fix
Mar 23, 2026
Merged

fix: ensure HMR wrapper forwards correct start/end nodes to active effect#17985
Rich-Harris merged 2 commits into
mainfrom
hmr-regression-fix

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@dummdidumm

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Fixes #17982 (two issues reported there)

Adding the start/end statically at the end once does not work because it's going to be stale when there's a HMR reload of the wrapped component. For reasons not completely clear to me it also fails in another case.

So instead of wrapping the HMR with comments we just forward the nodes of the inner effect to the outer active effect, pretending the wrapper isn't there from a "remove dom nodes"-perspective.

…fect

Fixes #17982 (two issues reported there)

Adding the start/end statically at the end once does not work because it's going to be stale when there's a HMR reload of the wrapped component. For reasons not completely clear to me it also fails in another case.

So instead of wrapping the HMR with comments we just forward the nodes of the inner effect to the outer active effect, pretending the wrapper isn't there from a "remove dom nodes"-perspective.
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changeset-bot Bot commented Mar 22, 2026

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🦋 Changeset detected

Latest commit: 029c325

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

This PR includes changesets to release 1 package
Name Type
svelte Patch

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pnpm add https://pkg.pr.new/svelte@17985

@Rich-Harris

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actually... huh. AFAICT this is equivalent to my first attempt on #179320c70fef, and yet for some reason I changed it. For the life of me I can't figure out why, this seems like a perfectly good fix

@Rich-Harris Rich-Harris merged commit 1773cb5 into main Mar 23, 2026
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@Rich-Harris Rich-Harris deleted the hmr-regression-fix branch March 23, 2026 00:46
@github-actions github-actions Bot mentioned this pull request Mar 23, 2026
Rich-Harris pushed a commit that referenced this pull request Mar 23, 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@5.55.0

### Minor Changes

- feat: export TweenOptions, SpringOptions, SpringUpdateOptions and
Updater from svelte/motion
([#17967](#17967))

### Patch Changes

- fix: ensure HMR wrapper forwards correct start/end nodes to active
effect ([#17985](#17985))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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goto navigation still shows old page when new page has new layout since 5.53.13

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