# Preact changelog

> A 3kB alternative to React with the same modern API.

- Vendor: Preact
- Category: Frameworks & Libraries
- Official site: https://preactjs.com
- Tracked by: What's New (https://whatsnew.fyi/product/preact)
- Harvested from: GitHub (preactjs/preact)
- Entries below: 11 (newest first)

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'.

## Releases

### 11.0.0-rc.0

- Date: 2026-08-10
- Version: 11.0.0-rc.0
- Original notes: https://github.com/preactjs/preact/releases/tag/11.0.0-rc.0
- Permalink: https://whatsnew.fyi/product/preact/releases/11.0.0-rc.0
- Labels: Pre-release

- **added** — Implement use hook in compat
- **added** — Implement getServerSnapshot for useSyncExternalStore
- **added** — Support createPortal in core
- **added** — Add useEffectEvent hook to compat
- **changed** — Leverage moveBefore rather than insertBefore when available
- **fixed** — Avoid mutating user-provided style objects when appending px
- **fixed** — Fix reusing template element content
- **fixed** — Fix dirty child strict equality bailout
- **fixed** — Add the constructor in when cloning VNodes
- **fixed** — Defer passive effect cleanup on unmount
- **changed** — Compute minimal child moves with a longest increasing subsequence
- **changed** — Batch updates in flushSync
- **changed** — Avoid traversing retained subtrees
- **changed** — Reduce core bundle size in v11
- **changed** — Reduce bundle size before release candidates go live
- **changed** — Hoist _children into a local in constructNewChildrenArray
- **changed** — Reduce Preact core compressed size
- **changed** — Bump reported React version to 19.0.0
- **fixed** — Avoid Trusted Types violation when dangerouslySetInnerHTML is used
- **changed** — Introduce a modern build setup

##### Features

- implement `use` in compat (#5186, thanks @JoviDeCroock)
- Implement getServerSnapshot for useSyncExternalStore (#4979, thanks @ssssota)
- Support createPortal in core (#5168, thanks @JoviDeCroock)
- Add useEffectEvent hook to compat (#5141, thanks @Mesoptier)

##### Correctness

- Leverage `moveBefore` rather than `insertBefore` when available (#5161, thanks @JoviDeCroock)
- Avoid mutating user-provided style objects when appending px (#5117, thanks @JSap0914)
- Fix reusing template element content (#5192, thanks @JoviDeCroock)
- Fix dirty child strict equality bailout (#5193, thanks @JoviDeCroock)
- Add the constructor in when cloning VNodes (#5195, thanks @JoviDeCroock)
- Defer passive effect cleanup on unmount (#5196, thanks @JoviDeCroock)

##### Performance

- Compute minimal child moves with a longest increasing subsequence (#5174, thanks @JoviDeCroock)
- Batch updates in flushSync (#5175, thanks @JoviDeCroock)
- Avoid traversing retained subtrees (#5183, thanks @JoviDeCroock)
- Reduce core bundle size in v11 (#5167, thanks @JoviDeCroock)
- Reduce bundle size before release candidates go live (#5197, thanks @JoviDeCroock)
- Hoist `_children` into a local in `constructNewChildrenArray` (#5198, thanks @JoviDeCroock)
- Reduce Preact core compressed size (#5199, thanks @JoviDeCroock)

##### Maintenance

- Bump reported React version to 19.0.0 (#5171, thanks @JoviDeCroock)
- Remove debug re-throw (#5190, thanks @JoviDeCroock)
- Commit pending hook state in `options._render` (#5187, thanks @JoviDeCroock)
- Remove straggler forwarded (#5178, thanks @JoviDeCroock)
- Derive document from parentDom instead of threading it (#5180, thanks @JoviDeCroock)
- Remove redundant portal children guard (#5179, thanks @JoviDeCroock)
- Restore `_bits` mangle for Preact ISO (#5200, thanks @JoviDeCroock)
- Update contribution build commands (#5166, thanks @Minsecrus)
- Remove unused dependencies (#5160, thanks @JoviDeCroock)
- Avoid Trusted Types violation when dangerouslySetInnerHTML is re… (#4935, thanks @lukewarlow)
- Introduce a modern build setup (#5159, thanks @JoviDeCroock)

### 10.29.8

- Date: 2026-08-01
- Version: 10.29.8
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.8
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.8

- **changed** — Batch updates in flushSync
- **changed** — Avoid traversing retained subtrees

##### Performance

- Batch updates in flushSync (#5173, thanks @JoviDeCroock)
- Avoid traversing retained subtrees (#5182, thanks @JoviDeCroock)

### 11.0.0-beta.2

- Date: 2026-07-15
- Version: 11.0.0-beta.2
- Original notes: https://github.com/preactjs/preact/releases/tag/11.0.0-beta.2
- Permalink: https://whatsnew.fyi/product/preact/releases/11.0.0-beta.2
- Labels: Pre-release

- **added** — Implement streamed hydration
- **changed** — Accept Signalish for input type
- **removed** — Remove erroneous 'type' attribute from select element types
- **fixed** — Fix compat Suspense hydration children recovery
- **fixed** — Check nodeType instead of the global document
- **fixed** — Fix Suspense undefined prop revalidation
- **fixed** — Fix error recovery for partially rendered subtrees
- **fixed** — Fix useId stability across async Suspense
- **fixed** — Flush subtree effects
- **fixed** — Fix memory leak hotspots
- **fixed** — Fix hydrate recovery with null excess DOM children
- **fixed** — Fix buggy edge case
- **fixed** — Preserve falsy key and ref values in cloneElement
- **changed** — Use Symbols for the event clock keys
- **changed** — Improve compat shallowDiffers performance
- **changed** — Avoid redundant allocations and writes
- **changed** — Use .push.apply for better performance

##### Forward porting

- Frontport 10.29.4 (#5139, thanks @JoviDeCroock)
- Frontport 10.29.3 (#5122, thanks @JoviDeCroock)
- Forwardport v10.x fixes since 2026-03-25 (#5089, thanks @JoviDeCroock)
- Forwardport from v10 (#5053, thanks @JoviDeCroock)

##### Features

- Implement streamed hydration rfc (#5035, thanks @JoviDeCroock)

##### Types

- Remove erroneous 'type' attribute from select element types (#5097, thanks @rschristian)
- Accept Signalish for input type (#5095, thanks @JoviDeCroock)

##### Fixes

- Fix compat Suspense hydration children recovery (#5146, thanks @JoviDeCroock)
- Check `nodeType` instead of the global `document` (#5119, thanks @natemoo-re)
- Fix Suspense undefined prop revalidation (#5133, thanks @JoviDeCroock)
- Fix error recovery for partially rendered subtrees (#5120, thanks @JoviDeCroock)
- Fix useId stability across async Suspense (#5108, thanks @JoviDeCroock)
- Flush subtree effects (#5055, thanks @JoviDeCroock)
- Fix memory leak hotspots (#5116, thanks @JoviDeCroock)
- Fix hydrate recovery with null excess DOM children (#5112, thanks @JoviDeCroock)
- Fix buggy edge case (#5092, thanks @JoviDeCroock)
- Preserve falsy key and ref values in cloneElement (#5082, thanks @Olexandr88)

##### Performance

- Use Symbols for the event clock keys (#5143, thanks @JoviDeCroock)
- Performance: compat `shallowDiffers` (#4780, thanks @romgrk)
- Avoid redundant allocations and writes (#5115, thanks @JoviDeCroock)
- Use .push.apply (#5024, thanks @JoviDeCroock)

##### Maintenance

- Bump pinned GitHub actions (#5110, thanks @JoviDeCroock)
- Fix typo in vitest config (#5111, thanks @kumavis)
- Use npm staged publishing (#5100, thanks @JoviDeCroock)
- Harden trusted publish workflow (#5099, thanks @JoviDeCroock)
- Add tier 3 sponsor logos (#5093, thanks @JoviDeCroock)
- Add trusted publishing workflow for main (#5086, thanks @JoviDeCroock)
- Add `chai` to dev dependencies to make pnpm install work (#5043, thanks @marvinhagemeister)

### 10.29.7

- Date: 2026-07-08
- Version: 10.29.7
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.7
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.7

##### Maintenance

- Make RTS optional peer dep (#5150, thanks @JoviDeCroock)

### 10.29.6

- Date: 2026-07-08
- Version: 10.29.6
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.6
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.6

- **fixed** — Reverted incompatible change with useSignalEffect

We had to revert https://github.com/preactjs/preact/pull/5055 due to an incompatibility with `useSignalEffect`

### 10.29.5

- Date: 2026-07-07
- Version: 10.29.5
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.5
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.5

- **fixed** — Fixed Compat Suspense hydration children recovery

##### Fixes

- Compat Suspense hydration children recovery (#5144, thanks @JoviDeCroock)

### 10.29.4

- Date: 2026-07-03
- Version: 10.29.4
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.4
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.4

- **fixed** — Fix hydration-suspense crashing due to sCU bail
- **fixed** — Revert Fix useId stability across async Suspense

##### Fixes

- Fix hydration-suspense crashing due to sCU bail (#5134, thanks @JoviDeCroock)
- Revert "Fix useId stability across async Suspense (#5108)" (#5135, thanks @JoviDeCroock)

### 10.29.3

- Date: 2026-06-26
- Version: 10.29.3
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.3
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.3

- **fixed** — Fix error recovery for partially rendered subtrees
- **fixed** — Fix useId stability across async Suspense
- **fixed** — Flush subtree effects when rendering a pending node
- **fixed** — Fix hydrate recovery with null excess DOM children
- **changed** — Address and guard memory leak hotspots
- **changed** — Avoid redundant allocations and writes
- **changed** — Accept Signalish for input DOM-type

##### Fixes

- Fix error recovery for partially rendered subtrees (#5120, thanks @JoviDeCroock)
- Fix `useId` stability across async `Suspense` (#5108, thanks @JoviDeCroock)
- Flush subtree effects when rendering a pending node (#5055, thanks @JoviDeCroock)
- Fix hydrate recovery with null excess DOM children (#5112, thanks @JoviDeCroock)

##### Performance

- Address and guard memory leak hotspots (#5116, thanks @JoviDeCroock)
- Avoid redundant allocations and writes (#5115, thanks @JoviDeCroock)

##### Types

- Accept `Signalish` for `input` DOM-type (#5096, thanks @JoviDeCroock)

##### Maintenance

- Use npm staged publishing (#5101, thanks @JoviDeCroock)
- Add tier 3 sponsor logos (#5098, thanks @JoviDeCroock)

### 10.29.2

- Date: 2026-05-17
- Version: 10.29.2
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.2
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.2

- **fixed** — Fix hydration when we have defaultValue or value on a textarea

##### Fixes

- Fix hydration when we have defaultValue or value on a textarea (#5081, thanks @JoviDeCroock)

##### Maintenance

- Add CODEOWNERS for GitHub configuration (v10.x) (#5088, thanks @JoviDeCroock)
- Fix trusted publishing workflow (#5084, thanks @JoviDeCroock)
- Trusted publishing (#5072, thanks @JoviDeCroock)

### 10.29.1

- Date: 2026-04-03
- Version: 10.29.1
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.1
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.1

- **fixed** — Create a unique event-clock for each Preact instance on a page
- **fixed** — Fix incorrect DOM order with conditional ContextProvider and inner keys

##### Fixes

- Create a unique event-clock for each Preact instance on a page. (#5068, thanks @JoviDeCroock)
- Fix incorrect DOM order with conditional ContextProvider and inner keys (#5067, thanks @JoviDeCroock)

##### Maintenance

- fix: Remove postinstall script for playwright setup (#5063, thanks @rschristian)
- chore: speed up tests by using playwright instead of webdriverio (#5060, thanks @marvinhagemeister)
- chore: migrate remaining .js -> .jsx files (#5059, thanks @marvinhagemeister)
- chore: rename `.test.js` -> `.test.jsx` when JSX is used (#5058, thanks @marvinhagemeister)
- Migrate from biome to oxfmt (#5033, thanks @JoviDeCroock)

### 10.29.0

- Date: 2026-03-10
- Version: 10.29.0
- Original notes: https://github.com/preactjs/preact/releases/tag/10.29.0
- Permalink: https://whatsnew.fyi/product/preact/releases/10.29.0

- **added** — Implement flushSync
- **fixed** — Ensure we reset renderCount
- **fixed** — Fix undefined prototype
- **changed** — Golf down compat for performance improvements

##### Features

- Implement flushSync (#5036, thanks @JoviDeCroock)

##### Fixes

- Ensure we reset renderCount (#5017, thanks @JoviDeCroock)
- undefined prototype (#5041, thanks @JoviDeCroock)

##### Performance

- Golf down compat (#5025, thanks @JoviDeCroock)