v2026.9.21 svelte@5.57.2
low risk
sveltejs/svelteSep 21, 2026 → Oct 6, 202615 days between releases
What's New
Newer release is Svelte 5.57.2 (bug fixes), older is Hermes Agent v0.21.4; no functional overlap exists.
Bug Fixes
- Fixed async deriveds being created for destroyed components during top-level await.
- Resolved hydration state restoration when custom element attribute updates throw.
- Fixed compiler errors for redeclaring parameters within snippets.
- Corrected handling of deferred transitions aborted before initialization.
- Fixed event handlers assigned after a top-level await in production.
The Two Releases
v2026.9.21
Hermes Agent v0.21.4 (v2026.9.21)
Sep 21, 2026· 1 month ago
This patch release rolls up approximately 1,800 PRs since v0.21.3, focusing on Desktop UI enhancements, CLI improvements, and gateway security updates.
Full release notessvelte@5.57.2
svelte@5.57.2
Oct 6, 2026· 16 days ago
This is a patch release addressing a wide range of bug fixes involving async/await handling, hydration stability, and compiler behavior. It resolves issues with derived subscriptions, event handlers, and invalid syntax in conditional blocks.
Full release notes