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svelte@5.55.6

sveltejs/sveltesvelte@5.55.6May 14, 2026by github-actions[bot]

AI Summary

A comprehensive patch release replacing async blocking strategies with merging, fixing context reapplication during SSR, and resolving various derived and effect issues.

Key Highlights

  • Replace async 'blocking' strategy with 'merging'
  • Fix XSS on `hydratable` from user contents
  • Fix context reapplication during SSR error transformation
  • Fix `$state.eager/pending` dependency tracking
  • Flush eager effects in production

Full Release Notes

### Patch Changes

-   fix: leave stale promises to wait for a later resolution, instead of rejecting ([#18180](https://github.com/sveltejs/svelte/pull/18180))

-   fix: keep dependencies of `$state.eager/pending` ([#18218](https://github.com/sveltejs/svelte/pull/18218))

-   fix: reapply context after transforming error during SSR ([#18099](https://github.com/sveltejs/svelte/pull/18099))

-   fix: don't rebase just-created batches ([#18117](https://github.com/sveltejs/svelte/pull/18117))

-   chore: allow `null` for `pending` in typings ([#18201](https://github.com/sveltejs/svelte/pull/18201))

-   fix: flush eager effects in production ([#18107](https://github.com/sveltejs/svelte/pull/18107))

-   fix: rethrow error of failed iterable after calling `return()` ([#18169](https://github.com/sveltejs/svelte/pull/18169))

-   fix: account for proxified instance when updating `bind:this` ([#18147](https://github.com/sveltejs/svelte/pull/18147))

-   fix: ensure scheduled batch is flushed if not obsolete ([#18131](https://github.com/sveltejs/svelte/pull/18131))

-   fix: resolve stale deriveds with latest value ([#18167](https://github.com/sveltejs/svelte/pull/18167))

-   chore: remove unnecessary `increment_pending` calls ([#18183](https://github.com/sveltejs/svelte/pull/18183))

-   fix: correctly compile component member expressions for SSR ([#18192](https://github.com/sveltejs/svelte/pull/18192))

-   fix: reset `source.updated` stack traces after `flush` ([#18196](https://github.com/sveltejs/svelte/pull/18196))

-   fix: replacing async 'blocking' strategy with 'merging' ([#18205](https://github.com/sveltejs/svelte/pull/18205))

-   fix: allow `@debug` tags to reference awaited variables ([#18138](https://github.com/sveltejs/svelte/pull/18138))

-   fix: re-run fallback props if dependencies update ([#18146](https://github.com/sveltejs/svelte/pull/18146))

-   fix: abort running obsolete async branches ([#18118](https://github.com/sveltejs/svelte/pull/18118))

-   fix: ignore comments when reading CSS values ([#18153](https://github.com/sveltejs/svelte/pull/18153))

-   fix: wrap `Promise.all` in `save` during SSR ([#18178](https://github.com/sveltejs/svelte/pull/18178))

-   fix: ignore false-positive errors of `$inspect` dependencies ([#18106](https://github.com/sveltejs/svelte/pull/18106))