11.0.1

Fixes

• Keep suspended hydration within a component's own $s range (#5300, thanks @JoviDeCroock)
• Keep ref cleanups on the element instead of the ref function (#5290, thanks @JoviDeCroock)
• Unmount parked Suspense children when the boundary unmounts (#5295, thanks @gengjiawen)

DX

• Log the component stack of errors no boundary handles (#5297, thanks @JoviDeCroock)

Performance

• Key event listeners by prop name and stamp attach times per listener (#5272, thanks @JoviDeCroock)

Maintenance

• Change repository field to object format (#5292, thanks @piotr-cz)
• Fix the types of preact/compat/server and preact/compat/scheduler (#5282, thanks @JoviDeCroock)

11.0.0

https://preactjs.com/blog/preact-11

Read the upgrade-guide over at https://preactjs.com/guide/v11/upgrade-guide

All other release notes can be seen at

• https://github.com/preactjs/preact/releases/tag/11.0.0-rc.2
• https://github.com/preactjs/preact/releases/tag/11.0.0-rc.1
• https://github.com/preactjs/preact/releases/tag/11.0.0-rc.0
• https://github.com/preactjs/preact/releases/tag/11.0.0-beta.2
• https://github.com/preactjs/preact/releases/tag/11.0.0-beta.1
• https://github.com/preactjs/preact/releases/tag/11.0.0-beta.0

Fixes

• Re-attach refs when a suspended subtree reveals (#5258, thanks @JoviDeCroock)
• Map imageRendering to image-rendering (#5270, thanks @kwy404)
• Append when the insertion reference node lives in another container (#5252, thanks @JoviDeCroock)
• Only drop the insertion cursor when it's detached (#5273, thanks @JoviDeCroock)
• Fall back to the global document for containers without an ownerDocument (#5274, thanks @JoviDeCroock)
• Check for moveBefore() on the container instead of globally (#5275, thanks @JoviDeCroock)
• Fix resuming into the DOM kept while a component was suspended (#5276, thanks @JoviDeCroock)
• Stop DOM nesting validation at portal boundaries (#5277, thanks @JoviDeCroock)
• Preserve the casing of camelCase custom event names (#5278, thanks @JoviDeCroock)

Performance

• Remove cloneNode for top-level Fragments (#5271, thanks @JoviDeCroock)

Maintenance

• Remove comment about building during prepare from compressed-size (#5255, thanks @JoviDeCroock)
• Fix compressed size comparison with pnpm (#5254, thanks @JoviDeCroock)
• Migrate dependency management to a root and demo pnpm workspace (#5246, thanks @JoviDeCroock)
• Pin terser to 5.16.0 (#5268, thanks @JoviDeCroock)

11.0.0-rc.2

Notable

• Preserve hook state when Suspense re-suspends (#5239, thanks @JoviDeCroock)

Types

• Add selectedcontent JSX type (#5234, thanks @JoviDeCroock)
• Make the Children.map/forEach context argument optional (#5230, thanks @JoviDeCroock)

Fixes

• Keep the pending error flag until the boundary's retry render (#5227, thanks @JoviDeCroock)
• Only treat components with error handlers as error boundaries (#5226, thanks @JoviDeCroock)
• Anchor the MathML token element regex (#5228, thanks @JoviDeCroock)
• Fall back to insertBefore when the moved node was detached externally (#5244, thanks @JoviDeCroock)

Performance

• Omit dev fields from production jsx vnodes (#5220, thanks @JoviDeCroock)
• Resolve unmount error routing lazily (fixes #5217) (#5218, thanks @JoviDeCroock)
• Reduce gzip size when using jsx() (#5243, thanks @JoviDeCroock)

Maintenance

• Upgrade Vitest to 5 (#5238, thanks @JoviDeCroock)
• Upgrade Node.js to 22 (#5237, thanks @JoviDeCroock)
• Remove dead _dom/_children copy from compat Suspense _catchError (#5240, thanks @JoviDeCroock)
• Require preact-render-to-string >=6.7.0 as the optional peer (#5231, thanks @JoviDeCroock)
• Drop stale references to the removed min build and JSX.HTMLAttributes (#5232, thanks @JoviDeCroock)

11.0.0-rc.1

Features

• Tree-shake feature-specific compat hooks (#5203, thanks @JoviDeCroock)

Bundle size

• Simplify toChildArray guards (#5214, thanks @JoviDeCroock)
• Remove unused memo factory state (#5213, thanks @JoviDeCroock)
• Remove redundant textarea hydration hook (#5212, thanks @JoviDeCroock)
• Require prop type stack getter (#5210, thanks @JoviDeCroock)

Types

• Add missing lowercased html attributes to dom.d.ts (#5207, thanks @teddybradford)

Maintenance

• Clarify staged npm release approval flow (#5204, thanks @JoviDeCroock)
• Declare the sass dependency vite's scss compilation needs (#5206, thanks @upupming)
• Cover JSX refs and event bubbling (#5211, thanks @JoviDeCroock)
• Fix parameter description in getHookState function (#5209, thanks @exedealer)

11.0.0-rc.0

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

Performance

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

11.0.0-beta.2

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

Maintenance

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

10.29.6

We had to revert #5055 due to an incompatibility with useSignalEffect

10.29.5

Fixes

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