# Jotai v2.19.1

- Product: Jotai (https://whatsnew.fyi/product/jotai)
- Vendor: Poimandres
- Date: 2026-04-07
- Version: v2.19.1
- Original notes: https://github.com/pmndrs/jotai/releases/tag/v2.19.1
- Permalink: https://whatsnew.fyi/product/jotai/releases/v2.19.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Use symbol index signature in atomWithObservable to avoid Symbol.observable type reference
- **changed** — Replace nextDeps with prevDeps in internals
- **changed** — Reduce recomputeInvalidatedAtoms overhead for better performance
- **changed** — Reduce flushPending overhead for better performance
- **fixed** — Check if atom has dependencies before doing mountDependencies work for better performance
- **fixed** — Check if atom has onMount property before queueing processOnMount callback for better performance
- **changed** — Prefer no-any in types

This release includes several small refactors to improve performance.

##### What's Changed
* fix(vanilla/utils/atomWithObservable): use symbol index signature to avoid 'Symbol.observable' type reference by @sukvvon in https://github.com/pmndrs/jotai/pull/3274
* refactor(internals): replace nextDeps with prevDeps by @dmaskasky in https://github.com/pmndrs/jotai/pull/3278
* refactor(internals): reduce recomputeInvalidatedAtoms overhead (performance) by @dmaskasky in https://github.com/pmndrs/jotai/pull/3284
* refactor(internals): reduce flushPending overhead (performance) by @dmaskasky in https://github.com/pmndrs/jotai/pull/3285
* fix(internals): check if atom has dependencies before doing mountDependencies work (performance) by @dmaskasky in https://github.com/pmndrs/jotai/pull/3290
* fix(internals): check if atom has onMount property before queueing processOnMount callback (performance) by @dmaskasky in https://github.com/pmndrs/jotai/pull/3291
* refactor(types): prefer no-any by @dai-shi in https://github.com/pmndrs/jotai/pull/3304

##### New Contributors
* @aio39 made their first contribution in https://github.com/pmndrs/jotai/pull/3277

**Full Changelog**: https://github.com/pmndrs/jotai/compare/v2.19.0...v2.19.1