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svelte@5.56.4

sveltejs/sveltesvelte@5.56.4Jun 23, 2026by github-actions[bot]

AI Summary

A patch release fixing AST positioning, reactivity context restoration, and TypeScript parameter stripping issues.

Key Highlights

  • Fixed wrapping parentheses in `{@const}` declarator positions
  • Fixed reactivity context restoration logic
  • Fixed stripping of optional parameters in TS scripts

Full Release Notes

### Patch Changes

-   fix: include wrapping parentheses in `{@const}` declarator `end` position ([#18436](https://github.com/sveltejs/svelte/pull/18436))

-   fix: always unset reactivity context after restoring it ([#18453](https://github.com/sveltejs/svelte/pull/18453))

-   fix: don't notify `searchParams` subscribers when the URL changes without affecting the search string ([#18425](https://github.com/sveltejs/svelte/pull/18425))

-   fix: strip `?` from optional parameters in `<script lang="ts">` so generated JavaScript is valid ([#18448](https://github.com/sveltejs/svelte/pull/18448))