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svelte@5.51.4

sveltejs/sveltesvelte@5.51.4Feb 18, 2026by github-actions[bot]

AI Summary

A maintenance release that improves performance by proactively deferring effects in pending boundaries and introduces stricter checks to detect and error on non-idempotent keys in `each` blocks during development.

Key Highlights

  • Proactively defer effects in pending boundary
  • Detect and error on non-idempotent each block keys in dev mode

Full Release Notes

### Patch Changes

-   chore: proactively defer effects in pending boundary ([#17734](https://github.com/sveltejs/svelte/pull/17734))

-   fix: detect and error on non-idempotent each block keys in dev mode ([#17732](https://github.com/sveltejs/svelte/pull/17732))