software-mansion/react-native-reanimated 4.4.0 on GitHub

Key changes

iOS CSS Core Animation

Reanimated 4.4.0 introduces a new platform-backed CSS animation engine on iOS that runs animations
directly on Core Animation layers instead of going through the JS-driven update loop. It is hidden
behind the IOS_CSS_CORE_ANIMATION static feature flag.

feat: Wire CSSPlatformTransition with iOS platform implementation by @MatiPl01 in #9325
chore: Hide platform animations behind a feature flag by @MatiPl01 in #9493

Animation Backend

A new Animation Backend has been integrated behind a feature flag, which will help greatly with the flow of updating the Shadow Tree in animations.

Integrate Animation Backend behind a flag by @bartlomiejbloniarz in #9279

New useTimestamp hook

A new useTimestamp hook exposes the current frame timestamp as a Shared Value that updates every
frame with the time elapsed since the first frame, with an isActive flag to pause and resume updates.

Adds useTimestamp hook by @ashfurrow in #9162

Precompiled headers on Android

Reanimated's native build on Android now uses precompiled headers (ReanimatedPCH.h), significantly
reducing C++ compile times for both fresh and incremental builds.

Start using precompiled headers on Android by @tomekzaw in #9434

Other changes

fix(Reanimated): Spring jitter by @piaskowyk in #9463
feat: emit ESM package json by @tjzel in #9481
Add support for placeholderTextColor in synchronous props by @tomekzaw in #9409
Add support for shadowColor in synchronous props by @tomekzaw in #9411
Add support for shadowOffset in synchronous props by @tomekzaw in #9412
Add support for outlineColor, outlineOffset and outlineWidth in synchronous props by @tomekzaw in #9417
Add support for borderBlockColor, borderBlockStartColor and borderBlockEndColor in synchronous props by @tomekzaw in #9418
Unify synchronous props logic between platforms by @tomekzaw in #9381
Preallocate and reuse synchronous props buffers on Android by @tomekzaw in #9425
fix(Reanimated): laggy LA outside of Animation Backend by @tjzel in #9431
feat: CSSPlatformAnimation abstraction by @MatiPl01 in #9278
feat: CSSPlatformTransition abstraction by @MatiPl01 in #9324
chore: Rename EXPERIMENTAL_PLATFORM_CSS_ANIMATIONS to IOS_CSS_CORE_ANIMATION by @MatiPl01 in #9506
fix(Reanimated): RCTModernEventEmmitter for older RN by @tjzel in #9181
chore(Reanimated): post release 4.3.0 by @tjzel in #9182
Add check for conflicting feature flags by @tomekzaw in #9174
Store ShadowNodeFamily instead of ShadowNode in UpdatesRegistry by @tomekzaw in #9156
Store ShadowNodeFamily::Shared instead of ShadowNodeFamily * in PropsMap and ChildrenMap by @tomekzaw in #9184
Remove useInterpolateConfig function and InterpolateConfig and ColorSpace types by @tomekzaw in #9150
Bump React Native to 0.85.0-rc.6 by @tomekzaw in #9193
Update doNotStrip to keepDebugSymbols by @wisniewskij in #8636
Migrated packages/react-native-reanimated java->kotlin by @tshmieldev in #9163
removed JSCallInvokerResolver.kt by @tshmieldev in #9198
chore: Bump RN to 0.85.0 stable by @MatiPl01 in #9233
fix: animation cancellation race condition by @Nodonisko in #9235
fix: animation cancellation race condition missing code by @tjzel in #9242
Change UI runtime slow animations invocation pattern by @tshmieldev in #9205
chore: Remove no longer used StaticPropsRegistry methods and props by @MatiPl01 in #9226
chore: Remove unused css code by @MatiPl01 in #9227
fix: Incorrect CSS props reverting on CSS transition detach by @MatiPl01 in #9220
feat: Strict TS types in LA withInitialValues method by @MatiPl01 in #9232
fix: Freeze example crash and different timings by @MatiPl01 in #9247
feat: Add support for separate transform props in LA initial values config by @MatiPl01 in #9237
refactor: decouple raf and events by @tjzel in #9244
feat(Reanimated): Export NativeEventsManager by @j-piasecki in #8655
feat: adds withTargetValues modifier to default layout animations by @PiotrWszolek in #8848
chore(Reanimated): jest tests for useFrameCallback by @tjzel in #9255
docs: Remove withInitialValues for layout transitions by @MatiPl01 in #9258
fix: Remove withInitialValues and withTargetValues from layout transitions by @MatiPl01 in #9259
feat: Update initial value of shared value by @pranko17 in #8782
chore(Reanimated): add lint step to disallow worklets includes by @tjzel in #9262
docs: Add new types of initial values in layout animation configs by @MatiPl01 in #9257
docs: Add withTargetValues to Layout Animations docs by @PiotrWszolek in #9168
fix: Fix handling falsy values in jestUtils getCurrentStyle by @edkimmel in #7494
fix: Unistyles flattening regression in 4.3.0 by @MatiPl01 in #9284
fix(Reanimated): not flushing updates without mapper runs by @tjzel in #9270
fix(Reanimated): useScrollOffset on renderScrollComponent by @tjzel in #9286
chore: Extract CSS loop to the separate OperationsLoop class by @MatiPl01 in #9285
Chore(Reanimated): reanimatedmoduleproxy refactor by @tshmieldev in #9342
fix(Reanimated): registries race conditions by @tjzel in #9323
Remove checks for new arch enabled by @tomekzaw in #9311
feat: Add short-circuit for scheduleOnUI called from the UI thread on Android by @MatiPl01 in #9343
feat: Add LoopOperation interface and operation-based scheduling primitives by @MatiPl01 in #9346
docs: remove outdated "Debugging worklets" guide by @tomekzaw in #9355
Use REACT_NATIVE_VERSION_MINOR provided by React Native instead of custom definition by @tomekzaw in #8412
fix: Attempt to fix EXC_BAD_ACCESS in ReanimatedModuleProxy::performOperations during AnimationFrameBatchinator::flush by @MatiPl01 in #9308
Remove legacy CDP debugger setup via HermesExecutorRuntimeAdapter by @tomekzaw in #9356
chore(Reanimated): remove maybeRequestRender dead code by @tjzel in #9357
Remove linking ReactAndroid::hermestooling prefab by @tomekzaw in #9360
fix(Reanimated): remove unnecessary locks by @tjzel in #9361
Remove unused MessageQueueThread by @tomekzaw in #9329
Remove RuntimeInitialization.md by @tomekzaw in #9362
docs: add versions for Expo SDK 55 and 56 by @tomekzaw in #9341
Remove special handling of react-native-tvos in podspecs by @tomekzaw in #9365
Remove JSC runtime support by @tomekzaw in #9364
Extract synchronous props serialization and parsing logic to separate files by @tomekzaw in #9368
Improve error handling in synchronous props logic on Android by @tomekzaw in #9379
fix: ReJest beforeEach blocks by @tjzel in #9363
Remove _IS_FABRIC variable by @tomekzaw in #9375
Add missing @DoNotStrip annotations by @tomekzaw in #9372
chore: add include Matcher and cleanup runtime tests by @tjzel in #9384
fix: Dedupe native keyframes registration across same-content rules by @MatiPl01 in #9389
refactor: Divide CSS Transition settings form diffs by @wisniewskij in #9340
Move SynchronousPropsBufferSerializer into #ifdef ANDROID by @tomekzaw in #9395
Refactor synchronous props commands definition and lookup by @tomekzaw in #9396
fix: Conflict with global expo type overrides by @MatiPl01 in #9394
Use pushInt and pushDouble helper functions in synchronous props serializer by @tomekzaw in #9397
chore: Simplify AnimatedStyle types by @MatiPl01 in #9400
fix: runtime tests wrongly mocking console on UI Runtime by @tjzel in #9405
chore: fix runtime tests formatting by @tjzel in #9404
fix: Opaque colors support in SVG CSS animations by @MatiPl01 in #9421
fix(Reanimated): retain iOS module proxy explicitly by @bartlomiejbloniarz in #9414
fix: runtime tests ANR when initializing describe blocks by @tjzel in #9413
fix: CSS animatedProps in SVG not passed in initial render by @MatiPl01 in #9419
fix: animatedProps should take precedence over inline props by @MatiPl01 in #9422
Replace std::stof with std::stod in synchronous props logic by @tomekzaw in #9424
Synchronous props handling cleanup by @tomekzaw in #9423
fix: add mutex lock in LayoutAnimationsManager::transferSharedConfig by @tomekzaw in #9429
chore(Reanimated): remove onRender dead code by @tjzel in #9430
docs: update supported synchronous props in "Feature flags" page by @tomekzaw in #9439
Add constexpr in feature flag check in synchronous props buffer preallocation on Android by @tomekzaw in #9440
Remove bridgeless check on iOS by @tomekzaw in #9459
fix: forward ref through Animated.FlatList under React 19 by @elliottkember in #9466
feat: OperationsLoop for simpler css animations and transitions updates by @MatiPl01 in #9248
chore: Cleaner CSS animation/transition lifecycle by @MatiPl01 in #9487
feat: Convert css easing configs to the intermediate config format instead of function by @MatiPl01 in #9273
fix: Centralize the usage of locks, fix potential race conditions by @MatiPl01 in #9489
feat: CSS AnimationStyleInterpolatorFactory allowing interpolated properties subset modification by @MatiPl01 in #9276
feat: CSSLoopAnimation abstraction for reanimated-loop updated CSS animation properties by @MatiPl01 in #9277
feat: CSSLoopTransition abstraction for reanimated-loop updated CSS animation properties by @MatiPl01 in #9316
chore: CSSTransition implementation cleanup by @MatiPl01 in #9320
chore: bump RN compatibility to 0.86 by @tjzel in #9496
fix: Add missing locks by @MatiPl01 in #9495
fix: runtime tests in release by @tjzel in #9500
chore: Remove EXPERIMENTAL_CSS_ANIMATIONS_FOR_SVG_COMPONENTS feature flag by @MatiPl01 in #9501
chore: Add missing EXPERIMENTAL_PLATFORM_CSS_ANIMATIONS flag in a few places by @MatiPl01 in #9502
fix: Fix build issues after #9325 by @MatiPl01 in #9504
fix: Stop CA animations from leaking onto recycled layers by @MatiPl01 in #9508
fix: Convert CSS Core Animation beginTime to layer-local clock by @MatiPl01 in #9507
chore: Reintroduce EXPERIMENTAL_CSS_ANIMATIONS_FOR_SVG_COMPONENTS with default true by @MatiPl01 in #9510
docs: Add IOS_CSS_CORE_ANIMATION feature flag to docs by @MatiPl01 in #9505
release(Reanimated): 4.4.0 by @tjzel in #9514

New Contributors

@PiotrWszolek made their first contribution in #8848
@pranko17 made their first contribution in #8782
@edkimmel made their first contribution in #7494
@ashfurrow made their first contribution in #9162
@elliottkember made their first contribution in #9466

Full Changelog: 4.3.1...4.4.0

software-mansion/react-native-reanimated 4.4.0 Reanimated - 4.4.0 on GitHub