svelte@5.56.10
ComposioHQ/awesome-claude-skillssvelte@5.56.10Aug 20, 2026by github-actions[bot]
Upgrading?
AI Summary
This patch addresses CSS parsing edge cases, SSR transformation logic issues, and fixes for event handlers, custom elements, and async blocker analysis.
Key Highlights
- Fix CSS escape sequences when printing selectors
- Parse `:nth-child` with `of` clause where whitespace is not present
- Fix SSR transformation of expressions inside labeled statements
- Allow custom elements to receive async values as props
- Improve async blocker analysis performance to scale linearly
Full Release Notes
### Patch Changes
- fix: preserve CSS escape sequences when printing selectors ([#18667](https://github.com/sveltejs/svelte/pull/18667))
- fix: parse `:nth-child(2n of.foo)` where `of` is not followed by whitespace ([#18611](https://github.com/sveltejs/svelte/pull/18611))
- fix: transform expressions inside labeled statements during server compilation ([#18617](https://github.com/sveltejs/svelte/pull/18617))
- docs: clarify that context lookup includes the current component and all ancestors ([#18581](https://github.com/sveltejs/svelte/pull/18581))
- fix: apply CSS custom properties with falsy values on components ([#18634](https://github.com/sveltejs/svelte/pull/18634))
- fix: correctly print `{#await ... catch x}` et al ([#18645](https://github.com/sveltejs/svelte/pull/18645))
- fix: ignore comments of Program node during migration script ([#18656](https://github.com/sveltejs/svelte/pull/18656))
- fix: reliably resolve append_style to its correct root ([#18614](https://github.com/sveltejs/svelte/pull/18614))
- fix: clean up removed capture event handlers from spread attributes ([#18618](https://github.com/sveltejs/svelte/pull/18618))
- fix: don't corrupt renderer type during SSR's legacy `bind:` retry loop ([#18616](https://github.com/sveltejs/svelte/pull/18616))
- fix: treat concise arrow function bodies as implicit returns when calculating blockers ([#18613](https://github.com/sveltejs/svelte/pull/18613))
- fix: give effect teardowns the value from before the first write in a flush ([#18620](https://github.com/sveltejs/svelte/pull/18620))
- fix: avoid double-calling a derived reference when destructuring `$derived` of another `$derived` during server-side rendering ([#18668](https://github.com/sveltejs/svelte/pull/18668))
- fix: preserve namespaces in CSS type selectors ([#18678](https://github.com/sveltejs/svelte/pull/18678))
- fix: increment private state fields through a non-`this` receiver ([#18622](https://github.com/sveltejs/svelte/pull/18622))
- chore: deduplicate client and server context helpers ([#18580](https://github.com/sveltejs/svelte/pull/18580))
- fix: release `last_propagated_event` after event propagation settles so it no longer retains the last event's target subtree ([#18569](https://github.com/sveltejs/svelte/pull/18569))
- fix: allow custom elements to receive async values as props ([#18661](https://github.com/sveltejs/svelte/pull/18661))
- fix: strip comments from inline `style` values in linear time ([#18553](https://github.com/sveltejs/svelte/pull/18553))
- fix: prevent declaration comments from breaking server derived references ([#18641](https://github.com/sveltejs/svelte/pull/18641))
- perf: make async blocker analysis scale linearly with the number of top-level references ([#18549](https://github.com/sveltejs/svelte/pull/18549))
- fix: preserve short-circuiting for logical assignments to private state fields ([#18594](https://github.com/sveltejs/svelte/pull/18594))
Related Repositories
public-apis/public-apis★ 491,196
A collective list of free APIs
NousResearch/hermes-agent★ 256,052
The agent that grows with you
yt-dlp/yt-dlp★ 200,229
A feature-rich command-line audio/video downloader
microsoft/markitdown★ 191,547
Python tool for converting files and office documents to Markdown.
Significant-Gravitas/AutoGPT★ 187,699
AutoGPT is the vision of accessible AI for everyone, to use and to build on. Our mission is to provide the tools, so that you can focus on what matters.