## Summary Enables Basic View Transition support for React Native Fabric renderer. **Implemented:** - Added FabricUIManager bindings for view transition methods: `applyViewTransitionName`, `startViewTransition` - Implemented `startViewTransition` with proper callback orchestration (mutation → layout → afterMutation → spawnedWork → passive) - Added fallback behavior that flushes work synchronously when Fabric's `startViewTransition` returns null (e.g., when the ViewTransition ReactNativeFeatureFlag is not enabled) - Added Flow type declarations for new FabricUIManager methods - Stubbed with `__DEV__` warnings for all the other view transition config functions that are not yet implemented This allows React Native apps using Fabric to leverage the View Transition API for coordinated animations during state transitions, with graceful degradation when the native side doesn't support it. Below are diagrams of proposed architecture in fabric, and observation of what/when config functions get called during a basic shared transition example <img width="2290" height="1529" alt="Untitled-2026-03-19-1240" src="https://github.com/user-attachments/assets/192c9169-bc25-449c-a33b-dfec67179e7f" /> ## How did you test this change? - [x] `yarn flow fabric` - Flow type checks pass - [x] `yarn lint` - Lint checks pass - [x] Manually tested in Android catalyst app with `enableViewTransition` and `enableViewTransitionForPersistenceMode `in `ReactFeatureFlags.test-renderer.native-fb.js` and View Transition enabled via ReactNativeFeatureFlag - [x] Verified in the minified `ReactFabric-dev.fb.js` that the 'shim' config functions are not included - [x] Verified fallback behavior logs warning in `__DEV__` and flushes work synchronously when ViewTransition flag isn't enabled in Fabric
315 lines
9.7 KiB
JavaScript
315 lines
9.7 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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// libdefs cannot actually import. These are supposed to be the types imported
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// from 'react-native-renderer/src/ReactNativeTypes'
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type __MeasureOnSuccessCallback = (
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x: number,
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y: number,
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width: number,
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height: number,
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pageX: number,
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pageY: number,
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) => void;
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type __MeasureInWindowOnSuccessCallback = (
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x: number,
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y: number,
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width: number,
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height: number,
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) => void;
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type __MeasureLayoutOnSuccessCallback = (
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left: number,
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top: number,
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width: number,
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height: number,
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) => void;
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type __ReactNativeBaseComponentViewConfig = any;
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type __ViewConfigGetter = any;
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type __ViewConfig = any;
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type __AttributeConfiguration = any;
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// libdefs cannot actually import. This is supposed to be the type imported
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// from 'react-native-renderer/src/legacy-events/TopLevelEventTypes';
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type __RNTopLevelEventType = any;
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// libdefs cannot actually import. This is supposed to be the type imported
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// from 'react-reconciler/src/ReactCapturedValue'
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type __CapturedError = any;
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type DeepDifferOptions = {+unsafelyIgnoreFunctions?: boolean};
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type RawEventEmitterEvent = $ReadOnly<{
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eventName: string,
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// We expect, but do not/cannot require, that nativeEvent is an object
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// with the properties: key, elementType (string), type (string), tag (numeric),
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// and a stateNode of the native element/Fiber the event was emitted to.
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nativeEvent: {[string]: mixed, ...},
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}>;
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declare opaque type __PublicInstance;
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declare opaque type __PublicTextInstance;
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declare opaque type __PublicRootInstance;
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declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface' {
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declare export function deepDiffer(
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one: any,
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two: any,
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maxDepth?: number,
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options?: DeepDifferOptions,
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): boolean;
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declare export function deepDiffer(
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one: any,
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two: any,
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options: DeepDifferOptions,
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): boolean;
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declare export function deepFreezeAndThrowOnMutationInDev<T>(obj: T): T;
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declare export function flattenStyle(style: any): any;
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declare export const RCTEventEmitter: {
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register: (eventEmitter: mixed) => void,
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...
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};
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declare export const TextInputState: {
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blurTextInput: (object: any) => void,
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focusTextInput: (object: any) => void,
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...
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};
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declare export const ReactFiberErrorDialog: {
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showErrorDialog: (error: __CapturedError) => boolean,
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...
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};
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declare export const Platform: {OS: string, ...};
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declare export const UIManager: {
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customBubblingEventTypes: Object,
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customDirectEventTypes: Object,
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createView: (
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reactTag: number,
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viewName: string,
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rootTag: number,
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props: ?Object,
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) => void,
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dispatchViewManagerCommand: (
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reactTag: number,
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command: string,
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args: Array<any>,
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) => void,
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manageChildren: (
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containerTag: number,
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moveFromIndices: Array<number>,
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moveToIndices: Array<number>,
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addChildReactTags: Array<number>,
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addAtIndices: Array<number>,
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removeAtIndices: Array<number>,
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) => void,
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measure: (hostComponent: mixed, callback: Function) => void,
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measureInWindow: (nativeTag: ?number, callback: Function) => void,
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measureLayout: (
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nativeTag: mixed,
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nativeNode: number,
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onFail: Function,
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onSuccess: Function,
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) => void,
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removeRootView: (containerTag: number) => void,
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removeSubviewsFromContainerWithID: (containerId: number) => void,
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replaceExistingNonRootView: () => void,
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setChildren: (containerTag: number, reactTags: Array<number>) => void,
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updateView: (reactTag: number, viewName: string, props: ?Object) => void,
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__takeSnapshot: (
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view?: 'window' | Element | number,
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options?: {
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width?: number,
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height?: number,
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format?: 'png' | 'jpeg',
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quality?: number,
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...
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},
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) => Promise<any>,
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setJSResponder: (reactTag: number, blockNativeResponder: boolean) => void,
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clearJSResponder: () => void,
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findSubviewIn: (
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reactTag: ?number,
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point: Array<number>,
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callback: (
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nativeViewTag: number,
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left: number,
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top: number,
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width: number,
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height: number,
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) => void,
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) => void,
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...
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};
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declare export const legacySendAccessibilityEvent: (
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reactTag: number,
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eventTypeName: string,
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) => void;
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declare export const BatchedBridge: {
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registerCallableModule: (name: string, module: Object) => void,
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...
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};
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declare export const ReactNativeViewConfigRegistry: {
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customBubblingEventTypes: Object,
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customDirectEventTypes: Object,
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register: (name: string, callback: __ViewConfigGetter) => string,
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get: (name: string) => __ReactNativeBaseComponentViewConfig,
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...
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};
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declare export const RawEventEmitter: {
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emit: (channel: string, event: RawEventEmitterEvent) => string,
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...
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};
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declare export type PublicInstance = __PublicInstance;
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declare export type PublicTextInstance = __PublicTextInstance;
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declare export type PublicRootInstance = __PublicRootInstance;
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declare export type MeasureOnSuccessCallback = __MeasureOnSuccessCallback;
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declare export type MeasureInWindowOnSuccessCallback =
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__MeasureInWindowOnSuccessCallback;
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declare export type MeasureLayoutOnSuccessCallback =
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__MeasureLayoutOnSuccessCallback;
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declare export interface LegacyPublicInstance {
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blur(): void;
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focus(): void;
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measure(callback: __MeasureOnSuccessCallback): void;
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measureInWindow(callback: __MeasureInWindowOnSuccessCallback): void;
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measureLayout(
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relativeToNativeNode: number | LegacyPublicInstance,
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onSuccess: __MeasureLayoutOnSuccessCallback,
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onFail?: () => void,
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): void;
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setNativeProps(nativeProps: {...}): void;
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}
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declare export function getNodeFromPublicInstance(
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publicInstance: PublicInstance,
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): Object;
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declare export function getNativeTagFromPublicInstance(
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publicInstance: PublicInstance,
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): number;
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declare export function createPublicInstance(
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tag: number,
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viewConfig: __ViewConfig,
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internalInstanceHandle: mixed,
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publicRootInstance: PublicRootInstance | null,
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): PublicInstance;
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declare export function createPublicRootInstance(
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rootTag: number,
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): PublicRootInstance;
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declare export function createPublicTextInstance(
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internalInstanceHandle: mixed,
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): PublicTextInstance;
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declare export function getInternalInstanceHandleFromPublicInstance(
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publicInstance: PublicInstance,
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): ?Object;
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declare export function createAttributePayload(
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props: Object,
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validAttributes: __AttributeConfiguration,
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): null | Object;
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declare export function diffAttributePayloads(
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prevProps: Object,
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nextProps: Object,
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validAttributes: __AttributeConfiguration,
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): null | Object;
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}
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declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInitializeCore' {
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}
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declare module 'react-native' {
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declare export type HostInstance = __PublicInstance;
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declare export type PublicTextInstance = __PublicTextInstance;
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declare export type PublicRootInstance = __PublicRootInstance;
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declare export type MeasureOnSuccessCallback = __MeasureOnSuccessCallback;
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}
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// eslint-disable-next-line no-unused-vars
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declare const RN$enableMicrotasksInReact: boolean;
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// This is needed for a short term solution.
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// See https://github.com/facebook/react/pull/15490 for more info
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// eslint-disable-next-line no-unused-vars
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declare const nativeFabricUIManager: {
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createNode: (
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reactTag: number,
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viewName: string,
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rootTag: number,
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props: ?Object,
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eventTarget: Object,
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) => Object,
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cloneNode: (node: Object) => Object,
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cloneNodeWithNewChildren: (
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node: Object,
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children?: $ReadOnlyArray<Object>,
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) => Object,
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cloneNodeWithNewProps: (node: Object, newProps: ?Object) => Object,
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cloneNodeWithNewChildrenAndProps: (
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node: Object,
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newPropsOrChildren: ?Object | $ReadOnlyArray<Object>,
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newProps?: ?Object,
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) => Object,
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appendChild: (node: Object, childNode: Object) => void,
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createChildSet: () => Object,
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appendChildToSet: (childSet: Object, childNode: Object) => void,
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completeRoot: (rootTag: number, childSet: Object) => void,
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registerEventHandler: (
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callback: (
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eventTarget: null | Object,
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type: __RNTopLevelEventType,
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payload: Object,
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) => void,
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) => void,
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setNativeProps: (node: Object, nativeProps: Object) => Object,
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dispatchCommand: (node: Object, command: string, args: Array<any>) => void,
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sendAccessibilityEvent: (node: Object, eventTypeName: string) => void,
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measure: (node: Object, callback: __MeasureOnSuccessCallback) => void,
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measureInWindow: (
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node: Object,
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callback: __MeasureInWindowOnSuccessCallback,
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) => void,
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measureLayout: (
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node: Object,
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relativeNode: Object,
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onFail: () => void,
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onSuccess: __MeasureLayoutOnSuccessCallback,
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) => void,
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getBoundingClientRect: (
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node: Object,
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) => [
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/* x:*/ number,
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/* y:*/ number,
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/* width:*/ number,
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/* height:*/ number,
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],
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findNodeAtPoint: (
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node: Object,
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locationX: number,
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locationY: number,
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callback: (Object) => void,
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) => void,
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setIsJSResponder: (
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node: Object,
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isJsResponder: boolean,
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blockNativeResponder: boolean,
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) => void,
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unstable_DefaultEventPriority: number,
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unstable_DiscreteEventPriority: number,
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unstable_ContinuousEventPriority: number,
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unstable_IdleEventPriority: number,
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unstable_getCurrentEventPriority: () => number,
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applyViewTransitionName: (
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node: Object,
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name: string,
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className: ?string,
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) => void,
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startViewTransition: (mutationCallback: () => void) => {
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finished: Promise<void>,
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ready: Promise<void>,
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},
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...
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};
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