svelte@5.57.0 v2026.8.28.0

low risk

hasaneyldrm/exercises-datasetAug 28, 2026 → Aug 29, 20260 days between releases

What's New

Different projects: Svelte vs Macro (no shared features)

New Features

  • Export server-side rendering utilities (RenderOutput, SyncRenderOutput, Csp, Sha256Source)
  • Add agent credential-stamping for sandboxes and cloud agents
  • Add calendar event search UI
  • Add agent per-session instructions
  • Add new app view primitives and components

Improvements

  • Reuse cached value in `<select>` value guard
  • Source egress URL from Doppler
  • Improve tool rendering
  • Fix thread styling for StandaloneThreads
  • Enable oxlint eslint/complexity

Bug Fixes

  • Block template store subscriptions on promise assignment
  • Remove `<svelte:head>` anchors on unmount
  • Warn on undeclared shorthand event handlers
  • Fix thread styling for StandaloneThreads
  • Fix egress URL source for agent harness

Upgrade Notes

None, as the provided release notes appear to be for different projects (Svelte vs Macro).

The Two Releases

svelte@5.57.0

svelte@5.57.0

Aug 28, 2026· 2 months ago

This minor release introduces new server-side rendering utilities, adds a `has` function to context creation, supports default values for select elements, and enhances SvelteMap methods. It also includes a large number of bug fixes, performance optimizations, and improvements to the compiler and runtime.

Full release notes
v2026.8.28.0

v2026.8.28.0

Aug 29, 2026· 2 months ago

Focuses on agent capabilities, introducing credential-stamping for agents, calendar event search, and new UI primitives for the application.

Full release notes