svelte@5.43.15

sveltejs/sveltesvelte@5.43.15Nov 24, 2025by github-actions[bot]

AI Summary

This patch release fixes the eager execution of attachments and attribute effects, relaxes the restriction on calling `flushSync` in effects, and improves derived value storage.

Key Highlights

Fix eager execution of attachments and attribute effects
Lift 'flushSync cannot be called in effects' restriction
Fix storage of forked derived values

Full Release Notes

### Patch Changes

-   fix: don't execute attachments and attribute effects eagerly ([#17208](https://github.com/sveltejs/svelte/pull/17208))

-   chore: lift "flushSync cannot be called in effects" restriction ([#17139](https://github.com/sveltejs/svelte/pull/17139))

-   fix: store forked derived values ([#17212](https://github.com/sveltejs/svelte/pull/17212))