Move MutationObserver to react-native/src/private

Summary:
Changelog: [internal]

These files are safe to move because they haven't been enabled in OSS and people shouldn't be importing them directly.

Differential Revision: D60377869

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -6393,83 +6393,6 @@ declare export default typeof RCTModalHostViewNativeComponent;
 "
 `;
 
-exports[`public API should not change unintentionally Libraries/MutationObserver/MutationObserver.js 1`] = `
-"export type MutationObserverCallback = (
-  mutationRecords: $ReadOnlyArray<MutationRecord>,
-  observer: MutationObserver
-) => mixed;
-type MutationObserverInit = $ReadOnly<{
-  subtree?: boolean,
-  childList: true,
-  attributes?: boolean,
-  attributeFilter?: $ReadOnlyArray<string>,
-  attributeOldValue?: boolean,
-  characterData?: boolean,
-  characterDataOldValue?: boolean,
-}>;
-declare export default class MutationObserver {
-  _callback: MutationObserverCallback;
-  _observationTargets: Set<ReactNativeElement>;
-  _mutationObserverId: ?MutationObserverId;
-  constructor(callback: MutationObserverCallback): void;
-  observe(target: ReactNativeElement, options?: MutationObserverInit): void;
-  _unobserve(target: ReactNativeElement): void;
-  disconnect(): void;
-  _getOrCreateMutationObserverId(): MutationObserverId;
-  __getObserverID(): ?MutationObserverId;
-}
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/MutationObserver/MutationObserverManager.js 1`] = `
-"export type MutationObserverId = number;
-declare export function registerObserver(
-  observer: MutationObserver,
-  callback: MutationObserverCallback
-): MutationObserverId;
-declare export function unregisterObserver(
-  mutationObserverId: MutationObserverId
-): void;
-declare export function observe({
-  mutationObserverId: MutationObserverId,
-  target: ReactNativeElement,
-  subtree: boolean,
-}): void;
-declare export function unobserve(
-  mutationObserverId: number,
-  target: ReactNativeElement
-): void;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/MutationObserver/MutationRecord.js 1`] = `
-"export type MutationType = \\"attributes\\" | \\"characterData\\" | \\"childList\\";
-declare export default class MutationRecord {
-  _target: ReactNativeElement;
-  _addedNodes: NodeList<ReadOnlyNode>;
-  _removedNodes: NodeList<ReadOnlyNode>;
-  constructor(nativeRecord: NativeMutationRecord): void;
-  get addedNodes(): NodeList<ReadOnlyNode>;
-  get attributeName(): string | null;
-  get nextSibling(): ReadOnlyNode | null;
-  get oldValue(): mixed | null;
-  get previousSibling(): ReadOnlyNode | null;
-  get removedNodes(): NodeList<ReadOnlyNode>;
-  get target(): ReactNativeElement;
-  get type(): MutationType;
-}
-declare export function createMutationRecord(
-  entry: NativeMutationRecord
-): MutationRecord;
-"
-`;
-
-exports[`public API should not change unintentionally Libraries/MutationObserver/NativeMutationObserver.js 1`] = `
-"export * from \\"../../src/private/specs/modules/NativeMutationObserver\\";
-declare export default typeof NativeMutationObserver;
-"
-`;
-
 exports[`public API should not change unintentionally Libraries/NativeComponent/BaseViewConfig.js.flow 1`] = `
 "declare const PlatformBaseViewConfig: PartialViewConfigWithoutName;
 declare export default typeof PlatformBaseViewConfig;

packages/react-native/Libraries/__tests__/public-api-test.js

@@ -41,7 +41,7 @@ const FILES_WITH_KNOWN_ERRORS = new Set([
   'Libraries/Core/setUpErrorHandling.js',
   'Libraries/Core/setUpGlobals.js',
   'src/private/setup/setUpIntersectionObserver.js',
-  'Libraries/Core/setUpMutationObserver.js',
+  'src/private/setup/setUpMutationObserver.js',
   'Libraries/Core/setUpNavigator.js',
   'Libraries/Core/setUpPerformance.js',
   'Libraries/Core/setUpPerformanceObserver.js',

packages/react-native/Libraries/Core/setUpMutationObserver.js → packages/react-native/src/private/setup/setUpMutationObserver.js

@@ -8,9 +8,9 @@
  * @format
  */
 
-import {polyfillGlobal} from '../Utilities/PolyfillFunctions';
+import {polyfillGlobal} from '../../../Libraries/Utilities/PolyfillFunctions';
 
 polyfillGlobal(
   'MutationObserver',
-  () => require('../MutationObserver/MutationObserver').default,
+  () => require('../webapis/mutationobserver/MutationObserver').default,
 );

packages/react-native/Libraries/MutationObserver/MutationObserver.js → packages/react-native/src/private/webapis/mutationobserver/MutationObserver.js

@@ -13,7 +13,7 @@
 import type {MutationObserverId} from './MutationObserverManager';
 import type MutationRecord from './MutationRecord';
 
-import ReactNativeElement from '../../src/private/webapis/dom/nodes/ReactNativeElement';
+import ReactNativeElement from '../dom/nodes/ReactNativeElement';
 import * as MutationObserverManager from './MutationObserverManager';
 
 export type MutationObserverCallback = (

packages/react-native/Libraries/MutationObserver/MutationObserverManager.js → packages/react-native/src/private/webapis/mutationobserver/MutationObserverManager.js

@@ -18,20 +18,20 @@
  * the notifications together.
  */
 
-import type ReactNativeElement from '../../src/private/webapis/dom/nodes/ReactNativeElement';
+import type ReactNativeElement from '../dom/nodes/ReactNativeElement';
 import type MutationObserver, {
   MutationObserverCallback,
 } from './MutationObserver';
 import type MutationRecord from './MutationRecord';
 
+import * as Systrace from '../../../../Libraries/Performance/Systrace';
+import warnOnce from '../../../../Libraries/Utilities/warnOnce';
 import {
   getPublicInstanceFromInternalInstanceHandle,
   getShadowNode,
-} from '../../src/private/webapis/dom/nodes/ReadOnlyNode';
-import * as Systrace from '../Performance/Systrace';
-import warnOnce from '../Utilities/warnOnce';
+} from '../dom/nodes/ReadOnlyNode';
 import {createMutationRecord} from './MutationRecord';
-import NativeMutationObserver from './NativeMutationObserver';
+import NativeMutationObserver from './specs/NativeMutationObserver';
 
 export type MutationObserverId = number;
 

packages/react-native/Libraries/MutationObserver/MutationRecord.js → packages/react-native/src/private/webapis/mutationobserver/MutationRecord.js

@@ -10,13 +10,11 @@
 
 // flowlint unsafe-getters-setters:off
 
-import type ReactNativeElement from '../../src/private/webapis/dom/nodes/ReactNativeElement';
-import type ReadOnlyNode from '../../src/private/webapis/dom/nodes/ReadOnlyNode';
-import type {NativeMutationRecord} from './NativeMutationObserver';
+import type ReactNativeElement from '../dom/nodes/ReactNativeElement';
+import type ReadOnlyNode from '../dom/nodes/ReadOnlyNode';
+import type {NativeMutationRecord} from './specs/NativeMutationObserver';
 
-import NodeList, {
-  createNodeList,
-} from '../../src/private/webapis/dom/oldstylecollections/NodeList';
+import NodeList, {createNodeList} from '../dom/oldstylecollections/NodeList';
 
 export type MutationType = 'attributes' | 'characterData' | 'childList';
 

packages/react-native/src/private/specs/modules/NativeMutationObserver.js → packages/react-native/src/private/webapis/mutationobserver/specs/NativeMutationObserver.js

@@ -8,9 +8,9 @@
  * @format
  */
 
-import type {TurboModule} from '../../../../Libraries/TurboModule/RCTExport';
+import type {TurboModule} from '../../../../../Libraries/TurboModule/RCTExport';
 
-import * as TurboModuleRegistry from '../../../../Libraries/TurboModule/TurboModuleRegistry';
+import * as TurboModuleRegistry from '../../../../../Libraries/TurboModule/TurboModuleRegistry';
 
 export type MutationObserverId = number;
 

packages/react-native/Libraries/MutationObserver/__mocks__/NativeMutationObserver.js → packages/react-native/src/private/webapis/mutationobserver/specs/__mocks__/NativeMutationObserver.js

@@ -15,27 +15,27 @@
  * JavaScript as an integration test using only public APIs.
  */
 
-import type {NodeSet} from '../../ReactNative/FabricUIManager';
-import type {RootTag} from '../../ReactNative/RootTag';
+import type {NodeSet} from '../../../../../../Libraries/ReactNative/FabricUIManager';
+import type {RootTag} from '../../../../../../Libraries/ReactNative/RootTag';
 import type {
   InternalInstanceHandle,
   Node,
-} from '../../Renderer/shims/ReactNativeTypes';
+} from '../../../../../../Libraries/Renderer/shims/ReactNativeTypes';
 import type {
   MutationObserverId,
   NativeMutationObserverObserveOptions,
   NativeMutationRecord,
   Spec,
 } from '../NativeMutationObserver';
 
-import ReadOnlyNode from '../../../src/private/webapis/dom/nodes/ReadOnlyNode';
 import {
   type NodeMock,
   type UIManagerCommitHook,
   fromNode,
   getFabricUIManager,
   getNodeInChildSet,
-} from '../../ReactNative/__mocks__/FabricUIManager';
+} from '../../../../../../Libraries/ReactNative/__mocks__/FabricUIManager';
+import ReadOnlyNode from '../../../dom/nodes/ReadOnlyNode';
 import invariant from 'invariant';
 import nullthrows from 'nullthrows';
 

packages/rn-tester/js/examples/MutationObserver/MutationObserverExample.js

@@ -15,8 +15,8 @@ import {RNTesterThemeContext} from '../../components/RNTesterTheme';
 import * as React from 'react';
 import {type ElementRef, useContext, useEffect, useRef, useState} from 'react';
 import {Pressable, ScrollView, StyleSheet, Text, View} from 'react-native';
-import MutationObserver from 'react-native/Libraries/MutationObserver/MutationObserver';
 import ReadOnlyElement from 'react-native/src/private/webapis/dom/nodes/ReadOnlyElement';
+import MutationObserver from 'react-native/src/private/webapis/mutationobserver/MutationObserver';
 
 export const name = 'MutationObserver Example';
 export const title = name;

packages/rn-tester/js/examples/MutationObserver/VisualCompletionExample/VCTrackerExample.js

@@ -11,9 +11,9 @@
 import type DOMRectReadOnly from 'react-native/src/private/webapis/dom/geometry/DOMRectReadOnly';
 import type ReadOnlyNode from 'react-native/src/private/webapis/dom/nodes/ReadOnlyNode';
 
-import MutationObserver from 'react-native/Libraries/MutationObserver/MutationObserver';
 import ReactNativeElement from 'react-native/src/private/webapis/dom/nodes/ReactNativeElement';
 import IntersectionObserver from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+import MutationObserver from 'react-native/src/private/webapis/mutationobserver/MutationObserver';
 
 export type VisualElement = {
   time: number,