0.16.4 svelte@5.56.10
enfein/mieruAug 20, 2026 → Aug 20, 20260 days between releases
What's New
The older release adds Ruff notebook diagnostics, while the newer release fixes CSS parsing and SSR memory leaks.
Breaking Changes
- CSS escape sequences are now preserved when printing selectors
Improvements
- Async blocker analysis performance improved to linear scaling
- Ruff server updated with new rules and dependency bumps
Bug Fixes
- Fixed CSS selector parsing for :nth-child
- Fixed SSR of labeled statements
- Fixed event propagation cleanup to prevent memory leaks
- Fixed InvalidInstruction on Windows CPUs
- Fixed semantic syntax errors in string type definitions
Upgrade Notes
For the newer release, CSS selectors using `:nth-child` with `of` now require whitespace, and SSR labeled statements are stabilized. For the older release, new rules detect duplicate keyword arguments and nonlocal parameters.
The Two Releases
0.16.4
Aug 20, 2026· 2 months ago
This release focuses on syntax error detection improvements and updates to the Ruff server, including notebook cell support and display-only fixes.
Full release notessvelte@5.56.10
Aug 20, 2026· 2 months ago
A patch release focusing on stabilizing server-side rendering and CSS handling. It fixes parsing issues with CSS selectors, improves async blocker performance, and resolves various hydration and event propagation bugs.
Full release notes