diff --git a/.flowconfig b/.flowconfig
index 4d01ae0c0e40..832667b526f1 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -56,6 +56,8 @@ experimental.multi_platform.extensions=.android
 munge_underscores=true
 
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
+module.name_mapper='^react-native/react-private-interface$' -> '<PROJECT_ROOT>/packages/react-native/src/react-private-interface.js'
+module.name_mapper='^react-native/setup-env$' -> '<PROJECT_ROOT>/packages/react-native/src/setup-env.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
 module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
diff --git a/.github/workflows/test-all.yml b/.github/workflows/test-all.yml
index 422a90c712ae..1f49896cbf36 100644
--- a/.github/workflows/test-all.yml
+++ b/.github/workflows/test-all.yml
@@ -471,9 +471,9 @@ jobs:
       - name: Flow
         shell: bash
         run: yarn flow-check
-      - name: TypeScript
+      - name: TypeScript (legacy deep imports / manual types)
         shell: bash
-        run: yarn test-typescript
+        run: yarn test-typescript-legacy
 
   test_js:
     runs-on: ubuntu-latest
diff --git a/jest.config.js b/jest.config.js
index 240abcbfeae2..aa6c08fb0ad2 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -26,6 +26,11 @@ module.exports = {
     '.*': './jest/preprocessor.js',
   },
   resolver: './packages/jest-preset/jest/resolver.js',
+  moduleNameMapper: {
+    // `resolver.js` strips `exports`, so alias this subpath to its `src/` impl.
+    '^react-native/setup-env$':
+      '<rootDir>/packages/react-native/src/setup-env.js',
+  },
   setupFiles: ['./packages/jest-preset/jest/local-setup.js'],
   fakeTimers: {
     enableGlobally: true,
diff --git a/package.json b/package.json
index 0f8e035b505e..df2852f1c5a2 100644
--- a/package.json
+++ b/package.json
@@ -33,8 +33,8 @@
     "test-release-local-clean": "node ./scripts/release-testing/test-release-local-clean.js",
     "test-release-local": "node ./scripts/release-testing/test-release-local.js",
     "test-ios": "./scripts/objc-test.sh test",
-    "test-typescript": "tsc -p packages/react-native/types/tsconfig.json",
-    "test-generated-typescript": "tsc -p packages/react-native/types_generated/tsconfig.test.json",
+    "test-typescript-legacy": "tsc -p packages/react-native/__typetests__/tsconfig.legacy.json",
+    "test-generated-typescript": "tsc -p packages/react-native/__typetests__/tsconfig.json",
     "test": "jest",
     "fantom": "./scripts/fantom.sh",
     "fantom-cli": "./scripts/fantom-cli.sh",
diff --git a/packages/community-cli-plugin/src/utils/loadMetroConfig.js b/packages/community-cli-plugin/src/utils/loadMetroConfig.js
index 43d9e4126af7..a41b028fa29a 100644
--- a/packages/community-cli-plugin/src/utils/loadMetroConfig.js
+++ b/packages/community-cli-plugin/src/utils/loadMetroConfig.js
@@ -60,16 +60,17 @@ function getCommunityCliDefaultConfig(
   return {
     resolver,
     serializer: {
-      // We can include multiple copies of InitializeCore here because metro will
+      // We can include multiple copies of setup-env here because Metro will
       // only add ones that are already part of the bundle
       getModulesRunBeforeMainModule: () => [
-        require.resolve(
-          path.join(ctx.reactNativePath, 'Libraries/Core/InitializeCore'),
-          {paths: [ctx.root]},
-        ),
+        // NOTE: ctx.reactNativePath is an absolute path, therefore we need to
+        // reference setup-env.js here by exact path specifier.
+        require.resolve(path.join(ctx.reactNativePath, 'src/setup-env.js'), {
+          paths: [ctx.root],
+        }),
         ...outOfTreePlatforms.map(platform =>
           require.resolve(
-            `${ctx.platforms[platform].npmPackageName}/Libraries/Core/InitializeCore`,
+            `${ctx.platforms[platform].npmPackageName}/setup-env`,
             {paths: [ctx.root]},
           ),
         ),
diff --git a/packages/eslint-plugin-react-native/__tests__/no-deep-imports-test.js b/packages/eslint-plugin-react-native/__tests__/no-deep-imports-test.js
index d28b33f45835..bf14e917f7bf 100644
--- a/packages/eslint-plugin-react-native/__tests__/no-deep-imports-test.js
+++ b/packages/eslint-plugin-react-native/__tests__/no-deep-imports-test.js
@@ -29,10 +29,10 @@ eslintTester.run('../no-deep-imports', rule, {
     "import Foo from 'react-native-foo';",
     "import Foo from 'react-native-foo/Foo';",
     "import Foo from 'react/native/Foo';",
-    "import 'react-native/Libraries/Core/InitializeCore';",
-    "require('react-native/Libraries/Core/InitializeCore');",
     "import Foo from 'react-native/src/fb_internal/Foo'",
     "require('react-native/src/fb_internal/Foo')",
+    "import 'react-native/setup-env';",
+    "require('react-native/setup-env');",
   ],
   invalid: [
     {
@@ -125,5 +125,31 @@ eslintTester.run('../no-deep-imports', rule, {
       ],
       output: null,
     },
+    {
+      code: "import 'react-native/Libraries/Core/InitializeCore';",
+      errors: [
+        {
+          messageId: 'useReplacementSource',
+          data: {
+            importPath: 'react-native/Libraries/Core/InitializeCore',
+            replacementSource: 'react-native/setup-env',
+          },
+        },
+      ],
+      output: "import 'react-native/setup-env';",
+    },
+    {
+      code: "require('react-native/Libraries/Core/InitializeCore');",
+      errors: [
+        {
+          messageId: 'useReplacementSource',
+          data: {
+            importPath: 'react-native/Libraries/Core/InitializeCore',
+            replacementSource: 'react-native/setup-env',
+          },
+        },
+      ],
+      output: "require('react-native/setup-env');",
+    },
   ],
 });
diff --git a/packages/eslint-plugin-react-native/no-deep-imports.js b/packages/eslint-plugin-react-native/no-deep-imports.js
index 6446c70ba6ac..e84a1f24d45b 100644
--- a/packages/eslint-plugin-react-native/no-deep-imports.js
+++ b/packages/eslint-plugin-react-native/no-deep-imports.js
@@ -21,6 +21,8 @@ module.exports = {
     messages: {
       deepImport:
         "'{{importPath}}' React Native deep imports are deprecated. Please use the top level import instead.",
+      useReplacementSource:
+        "'{{importPath}}' is deprecated. Please import '{{replacementSource}}' instead.",
     },
     schema: [],
     fixable: 'code',
@@ -31,12 +33,14 @@ module.exports = {
       ImportDeclaration(node) {
         if (
           !isDeepReactNativeImport(node.source) ||
-          isInitializeCoreImport(node.source) ||
           isSecondaryEntryPoint(node.source) ||
           isFbInternalImport(node.source)
         ) {
           return;
         }
+        if (reportReplacementSource(node.source)) {
+          return;
+        }
         if (isDefaultImport(node)) {
           const reactNativeSource = node.source.value.slice(
             'react-native/'.length,
@@ -88,13 +92,16 @@ module.exports = {
       CallExpression(node) {
         if (
           !isDeepRequire(node) ||
-          isInitializeCoreImport(node.arguments[0]) ||
           isSecondaryEntryPoint(node.arguments[0]) ||
           isFbInternalImport(node.arguments[0])
         ) {
           return;
         }
 
+        if (reportReplacementSource(node.arguments[0])) {
+          return;
+        }
+
         const parent = node.parent;
         const importPath = node.arguments[0].value;
 
@@ -123,6 +130,26 @@ module.exports = {
       },
     };
 
+    function reportReplacementSource(source) {
+      const reactNativeSource = source.value.slice('react-native/'.length);
+      const mapping = publicAPIMapping[reactNativeSource];
+      if (!mapping || !mapping.replacementSource) {
+        return false;
+      }
+      context.report({
+        node: source,
+        messageId: 'useReplacementSource',
+        data: {
+          importPath: source.value,
+          replacementSource: mapping.replacementSource,
+        },
+        fix(fixer) {
+          return fixer.replaceText(source, `'${mapping.replacementSource}'`);
+        },
+      });
+      return true;
+    }
+
     function getStandardReport(source) {
       return {
         node: source,
@@ -167,20 +194,15 @@ module.exports = {
       return parts.length > 1 && parts[0] === 'react-native';
     }
 
-    function isInitializeCoreImport(source) {
-      if (source.type !== 'Literal' || typeof source.value !== 'string') {
-        return false;
-      }
-
-      return source.value === 'react-native/Libraries/Core/InitializeCore';
-    }
-
     function isSecondaryEntryPoint(source) {
       if (source.type !== 'Literal' || typeof source.value !== 'string') {
         return false;
       }
 
-      return source.value === 'react-native/asset-registry';
+      return (
+        source.value === 'react-native/asset-registry' ||
+        source.value === 'react-native/setup-env'
+      );
     }
 
     function isFbInternalImport(source) {
diff --git a/packages/eslint-plugin-react-native/utils.js b/packages/eslint-plugin-react-native/utils.js
index 98d1e90ca0b0..728cc26d6ab3 100644
--- a/packages/eslint-plugin-react-native/utils.js
+++ b/packages/eslint-plugin-react-native/utils.js
@@ -37,6 +37,13 @@ const publicAPIMapping = {
     default: 'experimental_LayoutConformance',
     types: ['LayoutConformanceProps'],
   },
+  'Libraries/Core/InitializeCore': {
+    // `InitializeCore` has no public named export; the deep import must be
+    // swapped for the `react-native/setup-env` entry point entirely.
+    default: null,
+    types: null,
+    replacementSource: 'react-native/setup-env',
+  },
   'Libraries/Lists/FlatList': {
     default: 'FlatList',
     types: ['FlatListProps'],
diff --git a/packages/jest-preset/README.md b/packages/jest-preset/README.md
index de420553b828..c53da96056d0 100644
--- a/packages/jest-preset/README.md
+++ b/packages/jest-preset/README.md
@@ -36,9 +36,3 @@ module.exports = {
 ```
 
 You can further customize your Jest configuration by specifying other options. See [Jest's `jest.config.js` documentation](https://jestjs.io/docs/configuration) to learn more.
-
-### Migration Note
-
-This Jest preset used to be part of the core `react-native` package and accessible at `react-native/jest-preset.js`. As long as `@react-native/jest-preset` is installed, `react-native/jest-preset.js` will be aliased to this package and continue to work but is deprecated.
-
-Follow the installation instructions above to migrate to `@react-native/jest-preset` and change `preset: 'react-native'` to `preset: '@react-native/jest-preset` to migrate.
diff --git a/packages/jest-preset/jest-preset.js b/packages/jest-preset/jest-preset.js
index 5632cc7fe5c2..bfe131904a21 100644
--- a/packages/jest-preset/jest-preset.js
+++ b/packages/jest-preset/jest-preset.js
@@ -18,6 +18,11 @@ module.exports = {
     platforms: ['android', 'ios', 'native'],
   },
   moduleNameMapper: {
+    // `setup-env` is a secondary entry point exposed via the package's
+    // `exports`, but `./jest/resolver.js` strips `exports` and the generic
+    // mapper below resolves subpaths as literal directory paths. Alias it
+    // explicitly so it resolves to its `src/` implementation.
+    '^react-native/setup-env$': `${path.dirname(require.resolve('react-native'))}/src/setup-env.js`,
     '^react-native($|/.*)': `${path.dirname(require.resolve('react-native'))}/$1`,
   },
   resolver: require.resolve('./jest/resolver.js'),
diff --git a/packages/jest-preset/jest/setup.js b/packages/jest-preset/jest/setup.js
index 29f86698a129..483f14cad8f3 100644
--- a/packages/jest-preset/jest/setup.js
+++ b/packages/jest-preset/jest/setup.js
@@ -133,6 +133,7 @@ mock(
   'm#react-native/Libraries/Core/InitializeCore',
   'm#./mocks/InitializeCore',
 );
+mock('m#react-native/setup-env', 'm#./mocks/InitializeCore');
 mock('m#react-native/Libraries/Core/NativeExceptionsManager');
 mock('m#react-native/Libraries/Image/Image', 'm#./mocks/Image');
 mock(
diff --git a/packages/metro-config/src/index.flow.js b/packages/metro-config/src/index.flow.js
index 03a9aed5ace4..dcac214b3978 100644
--- a/packages/metro-config/src/index.flow.js
+++ b/packages/metro-config/src/index.flow.js
@@ -61,7 +61,7 @@ export function getDefaultConfig(projectRoot: string): ConfigT {
     serializer: {
       // Note: This option is overridden in cli-plugin-metro (getOverrideConfig)
       getModulesRunBeforeMainModule: () => [
-        require.resolve('react-native/Libraries/Core/InitializeCore'),
+        require.resolve('react-native/setup-env'),
       ],
       getPolyfills: () => require('@react-native/js-polyfills')(),
       isThirdPartyModule({path: modulePath}: Readonly<{path: string, ...}>) {
diff --git a/packages/react-native-babel-preset/src/__tests__/plugin-warn-on-deep-imports-test.js b/packages/react-native-babel-preset/src/__tests__/plugin-warn-on-deep-imports-test.js
index 820fc9c59eae..66f247d7112a 100644
--- a/packages/react-native-babel-preset/src/__tests__/plugin-warn-on-deep-imports-test.js
+++ b/packages/react-native-babel-preset/src/__tests__/plugin-warn-on-deep-imports-test.js
@@ -82,17 +82,3 @@ test('import from other package', () => {
     `"import { foo } from 'react-native-foo';"`,
   );
 });
-
-test('import react-native/Libraries/Core/InitializeCore', () => {
-  const code = `
-    import 'react-native/Libraries/Core/InitializeCore';
-    require('react-native/Libraries/Core/InitializeCore');
-    export * from 'react-native/Libraries/Core/InitializeCore';
-  `;
-
-  expect(transform(code, [rnDeepImportsWarningPlugin])).toMatchInlineSnapshot(`
-    "import 'react-native/Libraries/Core/InitializeCore';
-    require('react-native/Libraries/Core/InitializeCore');
-    export * from 'react-native/Libraries/Core/InitializeCore';"
-  `);
-});
diff --git a/packages/react-native-babel-preset/src/plugin-warn-on-deep-imports.js b/packages/react-native-babel-preset/src/plugin-warn-on-deep-imports.js
index 98f317586fa4..5e98ed59ad74 100644
--- a/packages/react-native-babel-preset/src/plugin-warn-on-deep-imports.js
+++ b/packages/react-native-babel-preset/src/plugin-warn-on-deep-imports.js
@@ -38,10 +38,6 @@ function isDeepReactNativeImport(source) {
   return parts.length > 1 && parts[0] === 'react-native';
 }
 
-function isInitializeCoreImport(source) {
-  return source === 'react-native/Libraries/Core/InitializeCore';
-}
-
 function withLocation(node, loc) {
   if (!node.loc) {
     return {...node, loc};
@@ -55,7 +51,7 @@ module.exports = ({types: t}) => ({
     ImportDeclaration(path, state) {
       const source = path.node.source.value;
 
-      if (isDeepReactNativeImport(source) && !isInitializeCoreImport(source)) {
+      if (isDeepReactNativeImport(source)) {
         const loc = path.node.loc;
         state.import.push({source, loc});
       }
@@ -71,10 +67,7 @@ module.exports = ({types: t}) => ({
       ) {
         const source =
           args[0].node.type === 'StringLiteral' ? args[0].node.value : '';
-        if (
-          isDeepReactNativeImport(source) &&
-          !isInitializeCoreImport(source)
-        ) {
+        if (isDeepReactNativeImport(source)) {
           const loc = path.node.loc;
           state.require.push({source, loc});
         }
@@ -83,11 +76,7 @@ module.exports = ({types: t}) => ({
     ExportNamedDeclaration(path, state) {
       const source = path.node.source;
 
-      if (
-        source &&
-        isDeepReactNativeImport(source.value) &&
-        !isInitializeCoreImport(source)
-      ) {
+      if (source && isDeepReactNativeImport(source.value)) {
         const loc = path.node.loc;
         state.export.push({source: source.value, loc});
       }
diff --git a/packages/react-native/Libraries/Core/InitializeCore.js b/packages/react-native/Libraries/Core/InitializeCore.js
index c3ba83318376..8846ce4dea50 100644
--- a/packages/react-native/Libraries/Core/InitializeCore.js
+++ b/packages/react-native/Libraries/Core/InitializeCore.js
@@ -22,6 +22,7 @@
  *   1. Require system.
  *   2. Bridged modules.
  *
+ * @deprecated Since 0.87. Use `'react-native/setup-env'` instead.
  */
 
 'use strict';
diff --git a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
index 190d559a7117..2cf1eca02e95 100644
--- a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
+++ b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js
@@ -8,124 +8,13 @@
  * @format
  */
 
-import typeof dispatchNativeEvent from '../../src/private/renderer/events/dispatchNativeEvent';
-import typeof CustomEvent from '../../src/private/webapis/dom/events/CustomEvent';
-import typeof BatchedBridge from '../BatchedBridge/BatchedBridge';
-import typeof legacySendAccessibilityEvent from '../Components/AccessibilityInfo/legacySendAccessibilityEvent';
-import typeof TextInputState from '../Components/TextInput/TextInputState';
-import typeof ExceptionsManager from '../Core/ExceptionsManager';
-import typeof RawEventEmitter from '../Core/RawEventEmitter';
-import typeof ReactFiberErrorDialog from '../Core/ReactFiberErrorDialog';
-import typeof RCTEventEmitter from '../EventEmitter/RCTEventEmitter';
-import typeof {
-  createPublicInstance,
-  createPublicRootInstance,
-  createPublicTextInstance,
-  getInternalInstanceHandleFromPublicInstance,
-  getNativeTagFromPublicInstance,
-  getNodeFromPublicInstance,
-} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
-import typeof {
-  create as createAttributePayload,
-  diff as diffAttributePayloads,
-} from '../ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
-import typeof UIManager from '../ReactNative/UIManager';
-import typeof * as ReactNativeViewConfigRegistry from '../Renderer/shims/ReactNativeViewConfigRegistry';
-import typeof flattenStyle from '../StyleSheet/flattenStyle';
-import type {DangerouslyImpreciseStyleProp} from '../StyleSheet/StyleSheet';
-import typeof deepFreezeAndThrowOnMutationInDev from '../Utilities/deepFreezeAndThrowOnMutationInDev';
-import typeof deepDiffer from '../Utilities/differ/deepDiffer';
-import typeof Platform from '../Utilities/Platform';
+import typeof {createPublicTextInstance} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
 
 export type {PublicRootInstance} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
 export type PublicTextInstance = ReturnType<createPublicTextInstance>;
 
-// flowlint unsafe-getters-setters:off
+/**
+ * @deprecated Since 0.88. Use 'react-native/react-private-interface' instead.
+ */
 // eslint-disable-next-line @react-native/monorepo/no-commonjs-exports
-module.exports = {
-  get BatchedBridge(): BatchedBridge {
-    return require('../BatchedBridge/BatchedBridge').default;
-  },
-  get ExceptionsManager(): ExceptionsManager {
-    return require('../Core/ExceptionsManager').default;
-  },
-  get Platform(): Platform {
-    return require('../Utilities/Platform').default;
-  },
-  get RCTEventEmitter(): RCTEventEmitter {
-    return require('../EventEmitter/RCTEventEmitter').default;
-  },
-  get ReactNativeViewConfigRegistry(): ReactNativeViewConfigRegistry {
-    return require('../Renderer/shims/ReactNativeViewConfigRegistry');
-  },
-  get TextInputState(): TextInputState {
-    return require('../Components/TextInput/TextInputState').default;
-  },
-  get UIManager(): UIManager {
-    return require('../ReactNative/UIManager').default;
-  },
-  // TODO: Remove when React has migrated to `createAttributePayload` and `diffAttributePayloads`
-  get deepDiffer(): deepDiffer {
-    return require('../Utilities/differ/deepDiffer').default;
-  },
-  get deepFreezeAndThrowOnMutationInDev(): deepFreezeAndThrowOnMutationInDev<
-    {...} | Array<unknown>,
-  > {
-    return require('../Utilities/deepFreezeAndThrowOnMutationInDev').default;
-  },
-  // TODO: Remove when React has migrated to `createAttributePayload` and `diffAttributePayloads`
-  get flattenStyle(): flattenStyle<DangerouslyImpreciseStyleProp> {
-    // $FlowFixMe[underconstrained-implicit-instantiation]
-    // $FlowFixMe[incompatible-type]
-    return require('../StyleSheet/flattenStyle').default;
-  },
-  get ReactFiberErrorDialog(): ReactFiberErrorDialog {
-    return require('../Core/ReactFiberErrorDialog').default;
-  },
-  get legacySendAccessibilityEvent(): legacySendAccessibilityEvent {
-    return require('../Components/AccessibilityInfo/legacySendAccessibilityEvent')
-      .default;
-  },
-  get RawEventEmitter(): RawEventEmitter {
-    return require('../Core/RawEventEmitter').default;
-  },
-  get CustomEvent(): CustomEvent {
-    return require('../../src/private/webapis/dom/events/CustomEvent').default;
-  },
-  get createAttributePayload(): createAttributePayload {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload')
-      .create;
-  },
-  get diffAttributePayloads(): diffAttributePayloads {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload')
-      .diff;
-  },
-  get createPublicRootInstance(): createPublicRootInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .createPublicRootInstance;
-  },
-  get createPublicInstance(): createPublicInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .createPublicInstance;
-  },
-  get createPublicTextInstance(): createPublicTextInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .createPublicTextInstance;
-  },
-  get getNativeTagFromPublicInstance(): getNativeTagFromPublicInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .getNativeTagFromPublicInstance;
-  },
-  get getNodeFromPublicInstance(): getNodeFromPublicInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .getNodeFromPublicInstance;
-  },
-  get getInternalInstanceHandleFromPublicInstance(): getInternalInstanceHandleFromPublicInstance {
-    return require('../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
-      .getInternalInstanceHandleFromPublicInstance;
-  },
-  get dispatchNativeEvent(): dispatchNativeEvent {
-    return require('../../src/private/renderer/events/dispatchNativeEvent')
-      .default;
-  },
-};
+module.exports = require('../../src/react-private-interface');
diff --git a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js.flow b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js.flow
index da6972e835df..c9b1e0e77c8b 100644
--- a/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js.flow
+++ b/packages/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js.flow
@@ -8,34 +8,8 @@
  * @format
  */
 
-import typeof {createPublicTextInstance as createPublicTextInstanceT} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
-
-export type {PublicRootInstance} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
-export type PublicTextInstance = ReturnType<createPublicTextInstanceT>;
-
-export {default as BatchedBridge} from '../BatchedBridge/BatchedBridge';
-export {default as ExceptionsManager} from '../Core/ExceptionsManager';
-export {default as Platform} from '../Utilities/Platform';
-export {default as RCTEventEmitter} from '../EventEmitter/RCTEventEmitter';
-export * as ReactNativeViewConfigRegistry from '../Renderer/shims/ReactNativeViewConfigRegistry';
-export {default as TextInputState} from '../Components/TextInput/TextInputState';
-export {default as UIManager} from '../ReactNative/UIManager';
-export {default as deepDiffer} from '../Utilities/differ/deepDiffer';
-export {default as deepFreezeAndThrowOnMutationInDev} from '../Utilities/deepFreezeAndThrowOnMutationInDev';
-export {default as flattenStyle} from '../StyleSheet/flattenStyle';
-export {default as ReactFiberErrorDialog} from '../Core/ReactFiberErrorDialog';
-export {default as legacySendAccessibilityEvent} from '../Components/AccessibilityInfo/legacySendAccessibilityEvent';
-export {default as RawEventEmitter} from '../Core/RawEventEmitter';
-export {default as CustomEvent} from '../../src/private/webapis/dom/events/CustomEvent';
-export {
-  create as createAttributePayload,
-  diff as diffAttributePayloads,
-} from '../ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
-export {
-  createPublicRootInstance,
-  createPublicInstance,
-  createPublicTextInstance,
-  getNativeTagFromPublicInstance,
-  getNodeFromPublicInstance,
-  getInternalInstanceHandleFromPublicInstance,
-} from '../ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+/**
+ * @deprecated Since 0.88. Use 'react-native/react-private-interface' instead.
+ */
+export type * from '../../src/react-private-interface';
+export * from '../../src/react-private-interface';
diff --git a/packages/react-native/ReactNativeApi.d.ts b/packages/react-native/ReactNativeApi.d.ts
index b5cdeaf11758..c4a2d4ff0beb 100644
--- a/packages/react-native/ReactNativeApi.d.ts
+++ b/packages/react-native/ReactNativeApi.d.ts
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<637f1d0b012ebca68c9e020a52eb2803>>
+ * @generated SignedSource<<e85dfe98c549ac9fff85a8d7b90b5fd3>>
  *
  * This file was generated by scripts/js-api/build-types/index.js.
  */
@@ -403,16 +403,6 @@ declare const staggerImpl: (
   time: number,
   animations: Array<CompositeAnimation>,
 ) => CompositeAnimation
-declare const States: {
-  ERROR: "ERROR"
-  NOT_RESPONDER: "NOT_RESPONDER"
-  RESPONDER_ACTIVE_LONG_PRESS_IN: "RESPONDER_ACTIVE_LONG_PRESS_IN"
-  RESPONDER_ACTIVE_LONG_PRESS_OUT: "RESPONDER_ACTIVE_LONG_PRESS_OUT"
-  RESPONDER_ACTIVE_PRESS_IN: "RESPONDER_ACTIVE_PRESS_IN"
-  RESPONDER_ACTIVE_PRESS_OUT: "RESPONDER_ACTIVE_PRESS_OUT"
-  RESPONDER_INACTIVE_PRESS_IN: "RESPONDER_INACTIVE_PRESS_IN"
-  RESPONDER_INACTIVE_PRESS_OUT: "RESPONDER_INACTIVE_PRESS_OUT"
-}
 declare const subtract: typeof $$AnimatedImplementation.subtract
 declare const subtractImpl: (
   a: AnimatedNode_default | number,
@@ -456,7 +446,6 @@ declare const ToastAndroid_default: {
     yOffset: number,
   ) => void
 }
-declare const Touchable: typeof TouchableImpl_default
 declare const Touchable_default: (
   props: TouchableOpacityProps & {
     ref?: React.Ref<TouchableOpacityInstance>
@@ -468,33 +457,6 @@ declare const TouchableHighlight_default: (
     ref?: React.Ref<TouchableHighlightInstance>
   },
 ) => React.ReactNode
-declare const TouchableImpl_default: {
-  Mixin: typeof TouchableMixinImpl
-  renderDebugView: ($$PARAM_0$$: {
-    color: ColorValue
-    hitSlop?: EdgeInsetsProp
-  }) => null | React.ReactNode
-}
-declare const TouchableMixinImpl: {
-  withoutDefaultFocusAndBlur: {}
-  componentDidMount: () => void
-  componentWillUnmount: () => void
-  touchableGetInitialState: () => {
-    touchable: {
-      responderID: GestureResponderEvent["currentTarget"] | undefined
-      touchState: TouchableState | undefined
-    }
-  }
-  touchableHandleBlur: (e: BlurEvent) => void
-  touchableHandleFocus: (e: FocusEvent) => void
-  touchableHandleResponderGrant: (e: GestureResponderEvent) => void
-  touchableHandleResponderMove: (e: GestureResponderEvent) => void
-  touchableHandleResponderRelease: (e: GestureResponderEvent) => void
-  touchableHandleResponderTerminate: (e: GestureResponderEvent) => void
-  touchableHandleResponderTerminationRequest: () => any
-  touchableHandleStartShouldSetResponder: () => any
-  touchableLongPressCancelsPress: () => boolean
-}
 declare const TouchableOpacity: typeof Touchable_default
 declare const UIManager: typeof UIManager_default
 declare const UIManager_default: UIManagerJSInterface
@@ -5371,7 +5333,6 @@ declare type TimingAnimationConfig = Readonly<
   }
 >
 declare type ToastAndroid = typeof ToastAndroid
-declare type Touchable = typeof Touchable
 declare type TouchableHighlight = typeof TouchableHighlight
 declare type TouchableHighlightBaseProps = {
   readonly activeOpacity?: number
@@ -5478,15 +5439,6 @@ declare type TouchableOpacityTVProps = {
   readonly nextFocusRight?: number
   readonly nextFocusUp?: number
 }
-declare type TouchableState =
-  | typeof States.ERROR
-  | typeof States.NOT_RESPONDER
-  | typeof States.RESPONDER_ACTIVE_LONG_PRESS_IN
-  | typeof States.RESPONDER_ACTIVE_LONG_PRESS_OUT
-  | typeof States.RESPONDER_ACTIVE_PRESS_IN
-  | typeof States.RESPONDER_ACTIVE_PRESS_OUT
-  | typeof States.RESPONDER_INACTIVE_PRESS_IN
-  | typeof States.RESPONDER_INACTIVE_PRESS_OUT
 declare function TouchableWithoutFeedback(
   props: TouchableWithoutFeedbackProps,
 ): React.ReactNode
@@ -6174,7 +6126,6 @@ export {
   TextProps, // 58466ea1
   TextStyle, // b62b8399
   ToastAndroid, // 88a8969a
-  Touchable, // c15da0a2
   TouchableHighlight, // 20ba0199
   TouchableHighlightInstance, // b510c0eb
   TouchableHighlightProps, // 337a9164
diff --git a/packages/react-native/__typetests__/index.tsx b/packages/react-native/__typetests__/index.tsx
index 1df236c3bc71..54ea8b7694ba 100644
--- a/packages/react-native/__typetests__/index.tsx
+++ b/packages/react-native/__typetests__/index.tsx
@@ -124,7 +124,6 @@ import {
   // @ts-ignore
   SectionListData,
   ToastAndroid,
-  Touchable,
   LayoutAnimation,
   processColor,
   experimental_LayoutConformance as LayoutConformance,
@@ -487,22 +486,6 @@ class Welcome extends React.Component<
 
 export default Welcome;
 
-// TouchableTest
-function TouchableTest() {
-  function basicUsage() {
-    return Touchable.renderDebugView({
-      color: 'mediumspringgreen',
-      hitSlop: {bottom: 5, top: 5},
-    });
-  }
-
-  function defaultHitSlop() {
-    return Touchable.renderDebugView({
-      color: 'red',
-    });
-  }
-}
-
 export class TouchableHighlightTest extends React.Component {
   buttonRef = React.createRef<React.ComponentRef<typeof TouchableHighlight>>();
 
diff --git a/scripts/js-api/build-types/templates/tsconfig.test.json b/packages/react-native/__typetests__/tsconfig.json
similarity index 59%
rename from scripts/js-api/build-types/templates/tsconfig.test.json
rename to packages/react-native/__typetests__/tsconfig.json
index 7af1dd074cb8..241c3b969fb2 100644
--- a/scripts/js-api/build-types/templates/tsconfig.test.json
+++ b/packages/react-native/__typetests__/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  "$schema": "https://json.schemastore.org/tsconfig",
   "compilerOptions": {
     "module": "esnext",
     "lib": ["es2020"],
@@ -9,9 +10,7 @@
     "jsx": "react",
     "noEmit": true,
     "forceConsistentCasingInFileNames": true,
-    "paths": {"react-native": ["."]},
-    "moduleResolution": "bundler",
-    "customConditions": ["react-native-strict-api"]
+    "moduleResolution": "bundler"
   },
-  "include": ["**/*.d.ts", "../__typetests__/**/*"]
+  "include": ["**/*"]
 }
diff --git a/packages/react-native/__typetests__/tsconfig.legacy.json b/packages/react-native/__typetests__/tsconfig.legacy.json
new file mode 100644
index 000000000000..3aea5153dceb
--- /dev/null
+++ b/packages/react-native/__typetests__/tsconfig.legacy.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "https://json.schemastore.org/tsconfig",
+  // Legacy variant: Opts into the `"react-native-legacy-deep-imports"` export
+  // condition so `react-native` and `react-native/Libraries/*` resolve to the
+  // hand-written types in `types/`.
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "customConditions": ["react-native-legacy-deep-imports"]
+  }
+}
diff --git a/packages/react-native/index.js b/packages/react-native/index.js
index 201ee115755d..0fb660e9aaf7 100644
--- a/packages/react-native/index.js
+++ b/packages/react-native/index.js
@@ -149,9 +149,6 @@ module.exports = {
   get TextInput() {
     return require('./Libraries/Components/TextInput/TextInput').default;
   },
-  get Touchable() {
-    return require('./Libraries/Components/Touchable/Touchable').default;
-  },
   get TouchableHighlight() {
     return require('./Libraries/Components/Touchable/TouchableHighlight')
       .default;
@@ -412,6 +409,21 @@ module.exports = {
   // #endregion
 } as ReactNativePublicAPI;
 
+// `Touchable` has been removed from the public API types, but remains
+// re-exported at runtime here because of a hanging `react-native-svg` call
+// site (fbsource).
+// TODO(huntie): Remove this re-export once `react-native-svg` is updated.
+/* $FlowFixMe[prop-missing] This is intentional: `Touchable` is a value-only
+ * re-export that is absent from the public API types. */
+/* $FlowFixMe[invalid-export] This is intentional: `Touchable` is a value-only
+ * re-export that is absent from the public API types. */
+Object.defineProperty(module.exports, 'Touchable', {
+  configurable: true,
+  get() {
+    return require('./Libraries/Components/Touchable/Touchable').default;
+  },
+});
+
 if (__DEV__) {
   /* $FlowFixMe[prop-missing] This is intentional: Flow will error when
    * attempting to access InteractionManager. */
diff --git a/packages/react-native/index.js.flow b/packages/react-native/index.js.flow
index 9869ed8c5907..51e4a54e0552 100644
--- a/packages/react-native/index.js.flow
+++ b/packages/react-native/index.js.flow
@@ -175,8 +175,6 @@ export type {
 } from './Libraries/Components/TextInput/TextInput';
 export {default as TextInput} from './Libraries/Components/TextInput/TextInput';
 
-export {default as Touchable} from './Libraries/Components/Touchable/Touchable';
-
 export type {
   TouchableHighlightInstance,
   TouchableHighlightProps,
diff --git a/packages/react-native/jest-preset.js b/packages/react-native/jest-preset.js
deleted file mode 100644
index 5251fcdbd0d2..000000000000
--- a/packages/react-native/jest-preset.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @noflow
- * @format
- */
-
-'use strict';
-
-try {
-  module.exports = require('@react-native/jest-preset');
-} catch (error) {
-  if (error.code === 'MODULE_NOT_FOUND') {
-    throw new Error(
-      `The React Native Jest preset has moved to a separate package.
-To migrate, please install "@react-native/jest-preset" and update your
-jest.config.js to reference:
-  preset: '@react-native/jest-preset'`,
-    );
-  } else {
-    throw error;
-  }
-}
diff --git a/packages/react-native/package.json b/packages/react-native/package.json
index 524857859285..c44e6658dec9 100644
--- a/packages/react-native/package.json
+++ b/packages/react-native/package.json
@@ -27,33 +27,36 @@
     "react-native": "cli.js"
   },
   "main": "./index.js",
-  "types": "types",
   "exports": {
     ".": {
-      "react-native-strict-api": "./types_generated/index.d.ts",
-      "types": "./types/index.d.ts",
+      "react-native-legacy-deep-imports": "./types/index.d.ts",
+      "types": "./types_generated/index.d.ts",
       "default": "./index.js"
     },
     "./Libraries/*": {
-      "react-native-strict-api": null,
-      "types": "./Libraries/*.d.ts",
+      "react-native-legacy-deep-imports": "./Libraries/*.d.ts",
+      "types": null,
       "default": "./Libraries/*.js"
     },
     "./Libraries/*.js": {
-      "react-native-strict-api": null,
+      "types": null,
       "default": "./Libraries/*.js"
     },
     "./scripts/*": "./scripts/*",
-    "./src/*": {
-      "types": null,
-      "default": "./src/*.js"
-    },
     "./asset-registry": {
       "types": null,
       "default": "./src/asset-registry.js"
     },
-    "./jest-preset": "./jest-preset.js",
-    "./rn-get-polyfills": "./rn-get-polyfills.js",
+    "./react-private-interface": {
+      "types": null,
+      "default": "./src/react-private-interface.js"
+    },
+    "./setup-env": "./src/setup-env.js",
+    "./unstable-internals-do-not-use": {
+      "react-native-unstable-internals": "./src/unstable-internals-do-not-use.d.ts",
+      "types": null,
+      "default": "./src/unstable-internals-do-not-use.js"
+    },
     "./src/fb_internal/*": "./src/fb_internal/*",
     "./package.json": "./package.json"
   },
@@ -69,7 +72,6 @@
     "gradle/libs.versions.toml",
     "index.js",
     "index.js.flow",
-    "jest-preset.js",
     "Libraries",
     "LICENSE",
     "React-Core.podspec",
@@ -90,7 +92,6 @@
     "ReactApple",
     "ReactCommon",
     "README.md",
-    "rn-get-polyfills.js",
     "scripts/replace-rncore-version.js",
     "scripts/bundle.js",
     "scripts/cocoapods",
@@ -136,16 +137,12 @@
     "featureflags": "node ./scripts/featureflags/index.js"
   },
   "peerDependencies": {
-    "@react-native/jest-preset": "0.87.0-rc.0",
     "@types/react": "^19.1.1",
     "react": "^19.2.3"
   },
   "peerDependenciesMeta": {
     "@types/react": {
       "optional": true
-    },
-    "@react-native/jest-preset": {
-      "optional": true
     }
   },
   "dependencies": {
@@ -153,7 +150,6 @@
     "@react-native/codegen": "0.87.0-rc.0",
     "@react-native/community-cli-plugin": "0.87.0-rc.0",
     "@react-native/gradle-plugin": "0.87.0-rc.0",
-    "@react-native/js-polyfills": "0.87.0-rc.0",
     "@react-native/normalize-colors": "0.87.0-rc.0",
     "@react-native/virtualized-lists": "0.87.0-rc.0",
     "anser": "^1.4.9",
diff --git a/packages/react-native/rn-get-polyfills.js b/packages/react-native/rn-get-polyfills.js
deleted file mode 100644
index bf0d0428de37..000000000000
--- a/packages/react-native/rn-get-polyfills.js
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow strict-local
- * @format
- */
-
-'use strict';
-
-module.exports = require('@react-native/js-polyfills');
diff --git a/packages/react-native/src/asset-registry.js b/packages/react-native/src/asset-registry.js
index e98f442e7694..6d3a4cdf34b4 100644
--- a/packages/react-native/src/asset-registry.js
+++ b/packages/react-native/src/asset-registry.js
@@ -11,7 +11,7 @@
 'use strict';
 
 // ----------------------------------------------------------------------------
-// Secondary react-native/asset-registry entry point.
+// react-native/asset-registry
 //
 // This is an untyped secondary entry point intended to be referenced from
 // Metro's `transformer.assetRegistryPath` config option. This entry point may
diff --git a/packages/react-native/src/react-private-interface.js b/packages/react-native/src/react-private-interface.js
new file mode 100644
index 000000000000..6e965490ebc9
--- /dev/null
+++ b/packages/react-native/src/react-private-interface.js
@@ -0,0 +1,145 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+// ----------------------------------------------------------------------------
+// react-native/react-private-interface
+//
+// This is a private entry point allowing React to require React Native
+// internals (previously, Libaries/ReactNativePrivateInterface.js).
+//
+// These APIs should ONLY be used by first party React internals and are not
+// part of our public API.
+//
+// IMPORTANT: Keep this file in sync with react-private-interface.js.flow.
+// ----------------------------------------------------------------------------
+
+import typeof BatchedBridge from '../Libraries/BatchedBridge/BatchedBridge';
+import typeof legacySendAccessibilityEvent from '../Libraries/Components/AccessibilityInfo/legacySendAccessibilityEvent';
+import typeof TextInputState from '../Libraries/Components/TextInput/TextInputState';
+import typeof ExceptionsManager from '../Libraries/Core/ExceptionsManager';
+import typeof RawEventEmitter from '../Libraries/Core/RawEventEmitter';
+import typeof ReactFiberErrorDialog from '../Libraries/Core/ReactFiberErrorDialog';
+import typeof RCTEventEmitter from '../Libraries/EventEmitter/RCTEventEmitter';
+import typeof {
+  createPublicInstance,
+  createPublicRootInstance,
+  createPublicTextInstance,
+  getInternalInstanceHandleFromPublicInstance,
+  getNativeTagFromPublicInstance,
+  getNodeFromPublicInstance,
+} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+import typeof {
+  create as createAttributePayload,
+  diff as diffAttributePayloads,
+} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
+import typeof UIManager from '../Libraries/ReactNative/UIManager';
+import typeof * as ReactNativeViewConfigRegistry from '../Libraries/Renderer/shims/ReactNativeViewConfigRegistry';
+import typeof flattenStyle from '../Libraries/StyleSheet/flattenStyle';
+import type {DangerouslyImpreciseStyleProp} from '../Libraries/StyleSheet/StyleSheet';
+import typeof deepFreezeAndThrowOnMutationInDev from '../Libraries/Utilities/deepFreezeAndThrowOnMutationInDev';
+import typeof deepDiffer from '../Libraries/Utilities/differ/deepDiffer';
+import typeof Platform from '../Libraries/Utilities/Platform';
+import typeof dispatchNativeEvent from './private/renderer/events/dispatchNativeEvent';
+import typeof CustomEvent from './private/webapis/dom/events/CustomEvent';
+
+export type {PublicRootInstance} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+export type PublicTextInstance = ReturnType<createPublicTextInstance>;
+
+// flowlint unsafe-getters-setters:off
+// eslint-disable-next-line @react-native/monorepo/no-commonjs-exports
+module.exports = {
+  get BatchedBridge(): BatchedBridge {
+    return require('../Libraries/BatchedBridge/BatchedBridge').default;
+  },
+  get ExceptionsManager(): ExceptionsManager {
+    return require('../Libraries/Core/ExceptionsManager').default;
+  },
+  get Platform(): Platform {
+    return require('../Libraries/Utilities/Platform').default;
+  },
+  get RCTEventEmitter(): RCTEventEmitter {
+    return require('../Libraries/EventEmitter/RCTEventEmitter').default;
+  },
+  get ReactNativeViewConfigRegistry(): ReactNativeViewConfigRegistry {
+    return require('../Libraries/Renderer/shims/ReactNativeViewConfigRegistry');
+  },
+  get TextInputState(): TextInputState {
+    return require('../Libraries/Components/TextInput/TextInputState').default;
+  },
+  get UIManager(): UIManager {
+    return require('../Libraries/ReactNative/UIManager').default;
+  },
+  // TODO: Remove when React has migrated to `createAttributePayload` and `diffAttributePayloads`
+  get deepDiffer(): deepDiffer {
+    return require('../Libraries/Utilities/differ/deepDiffer').default;
+  },
+  get deepFreezeAndThrowOnMutationInDev(): deepFreezeAndThrowOnMutationInDev<
+    {...} | Array<unknown>,
+  > {
+    return require('../Libraries/Utilities/deepFreezeAndThrowOnMutationInDev')
+      .default;
+  },
+  // TODO: Remove when React has migrated to `createAttributePayload` and `diffAttributePayloads`
+  get flattenStyle(): flattenStyle<DangerouslyImpreciseStyleProp> {
+    // $FlowFixMe[underconstrained-implicit-instantiation]
+    // $FlowFixMe[incompatible-type]
+    return require('../Libraries/StyleSheet/flattenStyle').default;
+  },
+  get ReactFiberErrorDialog(): ReactFiberErrorDialog {
+    return require('../Libraries/Core/ReactFiberErrorDialog').default;
+  },
+  get legacySendAccessibilityEvent(): legacySendAccessibilityEvent {
+    return require('../Libraries/Components/AccessibilityInfo/legacySendAccessibilityEvent')
+      .default;
+  },
+  get RawEventEmitter(): RawEventEmitter {
+    return require('../Libraries/Core/RawEventEmitter').default;
+  },
+  get CustomEvent(): CustomEvent {
+    return require('./private/webapis/dom/events/CustomEvent').default;
+  },
+  get createAttributePayload(): createAttributePayload {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload')
+      .create;
+  },
+  get diffAttributePayloads(): diffAttributePayloads {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload')
+      .diff;
+  },
+  get createPublicRootInstance(): createPublicRootInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .createPublicRootInstance;
+  },
+  get createPublicInstance(): createPublicInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .createPublicInstance;
+  },
+  get createPublicTextInstance(): createPublicTextInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .createPublicTextInstance;
+  },
+  get getNativeTagFromPublicInstance(): getNativeTagFromPublicInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .getNativeTagFromPublicInstance;
+  },
+  get getNodeFromPublicInstance(): getNodeFromPublicInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .getNodeFromPublicInstance;
+  },
+  get getInternalInstanceHandleFromPublicInstance(): getInternalInstanceHandleFromPublicInstance {
+    return require('../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance')
+      .getInternalInstanceHandleFromPublicInstance;
+  },
+  get dispatchNativeEvent(): dispatchNativeEvent {
+    return require('./private/renderer/events/dispatchNativeEvent').default;
+  },
+};
diff --git a/packages/react-native/src/react-private-interface.js.flow b/packages/react-native/src/react-private-interface.js.flow
new file mode 100644
index 000000000000..b30331d119f8
--- /dev/null
+++ b/packages/react-native/src/react-private-interface.js.flow
@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+// ----------------------------------------------------------------------------
+// Types entry point for react-native/react-private-interface
+//
+// IMPORTANT: Keep this file in sync with react-private-interface.js.
+// ----------------------------------------------------------------------------
+
+import typeof {createPublicTextInstance as createPublicTextInstanceT} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+
+export type {PublicRootInstance} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+export type PublicTextInstance = ReturnType<createPublicTextInstanceT>;
+
+export {default as BatchedBridge} from '../Libraries/BatchedBridge/BatchedBridge';
+export {default as ExceptionsManager} from '../Libraries/Core/ExceptionsManager';
+export {default as Platform} from '../Libraries/Utilities/Platform';
+export {default as RCTEventEmitter} from '../Libraries/EventEmitter/RCTEventEmitter';
+export * as ReactNativeViewConfigRegistry from '../Libraries/Renderer/shims/ReactNativeViewConfigRegistry';
+export {default as TextInputState} from '../Libraries/Components/TextInput/TextInputState';
+export {default as UIManager} from '../Libraries/ReactNative/UIManager';
+export {default as deepDiffer} from '../Libraries/Utilities/differ/deepDiffer';
+export {default as deepFreezeAndThrowOnMutationInDev} from '../Libraries/Utilities/deepFreezeAndThrowOnMutationInDev';
+export {default as flattenStyle} from '../Libraries/StyleSheet/flattenStyle';
+export {default as ReactFiberErrorDialog} from '../Libraries/Core/ReactFiberErrorDialog';
+export {default as legacySendAccessibilityEvent} from '../Libraries/Components/AccessibilityInfo/legacySendAccessibilityEvent';
+export {default as RawEventEmitter} from '../Libraries/Core/RawEventEmitter';
+export {default as CustomEvent} from './private/webapis/dom/events/CustomEvent';
+export {
+  create as createAttributePayload,
+  diff as diffAttributePayloads,
+} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactNativeAttributePayload';
+export {
+  createPublicRootInstance,
+  createPublicInstance,
+  createPublicTextInstance,
+  getNativeTagFromPublicInstance,
+  getNodeFromPublicInstance,
+  getInternalInstanceHandleFromPublicInstance,
+} from '../Libraries/ReactNative/ReactFabricPublicInstance/ReactFabricPublicInstance';
+export {default as dispatchNativeEvent} from './private/renderer/events/dispatchNativeEvent';
diff --git a/packages/react-native/src/setup-env.js b/packages/react-native/src/setup-env.js
new file mode 100644
index 000000000000..fbe7f9178b31
--- /dev/null
+++ b/packages/react-native/src/setup-env.js
@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+'use client';
+
+// ----------------------------------------------------------------------------
+// react-native/setup-env
+//
+// Side-effectful module that sets up the core React Native JavaScript
+// environment. This includes global timers (`setTimeout` etc), the global
+// `console` object, and hooks for printing stack traces with source maps.
+// ----------------------------------------------------------------------------
+
+require('./private/setup/setUpDefaultReactNativeEnvironment').default();
diff --git a/packages/react-native/src/unstable-internals-do-not-use.d.ts b/packages/react-native/src/unstable-internals-do-not-use.d.ts
new file mode 100644
index 000000000000..6c1f3bf54c40
--- /dev/null
+++ b/packages/react-native/src/unstable-internals-do-not-use.d.ts
@@ -0,0 +1,214 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+// ----------------------------------------------------------------------------
+// Types entry point for react-native/unstable-internals-do-not-use.
+//
+// IMPORTANT: Keep this file in sync with unstable-internals-do-not-use.js.
+// ----------------------------------------------------------------------------
+
+import type * as React from 'react';
+
+// #region AppContainer
+
+interface AppContainerProps {
+  children?: React.ReactNode | undefined;
+  rootTag: number;
+  initialProps?: object | undefined;
+  WrapperComponent?: React.ComponentType<any> | null | undefined;
+  rootViewStyle?: unknown | undefined;
+  internal_excludeLogBox?: boolean | undefined;
+  internal_excludeInspector?: boolean | undefined;
+}
+
+/** Root component that wraps and mounts a React Native app tree. */
+export const AppContainer: React.ComponentType<AppContainerProps>;
+
+// #endregion
+// #region AssetSourceResolver
+
+interface ResolvedAssetSource {
+  readonly __packager_asset: boolean;
+  readonly width: number | null | undefined;
+  readonly height: number | null | undefined;
+  readonly uri: string;
+  readonly scale: number;
+}
+
+/** Resolves a packager asset descriptor to a loadable source for the current platform. */
+export class AssetSourceResolver {
+  serverUrl: string | null | undefined;
+  jsbundleUrl: string | null | undefined;
+  asset: unknown;
+  constructor(
+    serverUrl: string | null | undefined,
+    jsbundleUrl: string | null | undefined,
+    asset: unknown,
+  );
+  isLoadedFromServer(): boolean;
+  isLoadedFromFileSystem(): boolean;
+  defaultAsset(): ResolvedAssetSource;
+  getAssetUsingResolver(resolver: 'android' | 'generic'): ResolvedAssetSource;
+  assetServerURL(): ResolvedAssetSource;
+  scaledAssetPath(): ResolvedAssetSource;
+  scaledAssetURLNearBundle(): ResolvedAssetSource;
+  resourceIdentifierWithoutScale(): ResolvedAssetSource;
+  drawableFolderInBundle(): ResolvedAssetSource;
+  fromSource(source: string): ResolvedAssetSource;
+  static pickScale(scales: number[], deviceScale?: number): number;
+}
+
+// #endregion
+// #region customDirectEventTypes
+
+/** Registry mapping custom direct (non-bubbling) event names to their registration names. */
+export const customDirectEventTypes: {
+  [eventName: string]: Readonly<{
+    registrationName: string;
+  }>;
+};
+
+// #endregion
+// #region DevLoadingView
+
+/** Dev-only overlay banner showing bundle load, refresh, and error status. */
+export const DevLoadingView: {
+  showMessage(
+    message: string,
+    type: 'load' | 'refresh' | 'error',
+    options?: {dismissButton?: boolean | undefined},
+  ): void;
+  hide(): void;
+};
+
+// #endregion
+// #region getDevServer
+
+interface DevServerInfo {
+  url: string;
+  fullBundleUrl: string | null;
+  bundleLoadedFromServer: boolean;
+}
+
+/** Returns information about the running dev server. */
+export function getDevServer(): DevServerInfo;
+
+// #endregion
+// #region HMRClient
+
+/** Client that receives Fast Refresh updates and applies them at runtime. */
+export class HMRClient {
+  enable(): void;
+  disable(): void;
+  registerBundle(requestUrl: string): void;
+  log(
+    level:
+      | 'trace'
+      | 'info'
+      | 'warn'
+      | 'error'
+      | 'log'
+      | 'group'
+      | 'groupCollapsed'
+      | 'groupEnd'
+      | 'debug',
+    data: ReadonlyArray<unknown>,
+  ): void;
+  setup(
+    platform: string,
+    bundleEntry: string,
+    host: string,
+    port: number | string,
+    isEnabled: boolean,
+    scheme?: string,
+  ): void;
+}
+
+// #endregion
+// #region NativeExceptionsManager
+
+interface StackFrame {
+  column: number | null;
+  file: string | null;
+  lineNumber: number | null;
+  methodName: string;
+  collapse?: boolean | undefined;
+}
+
+interface ExceptionData {
+  message: string;
+  originalMessage: string | null;
+  name: string | null;
+  componentStack: string | null;
+  stack: StackFrame[];
+  id: number;
+  isFatal: boolean;
+  extraData?: object | undefined;
+}
+
+/** Reports JS exceptions to native and manages RedBox. */
+export const NativeExceptionsManager: {
+  reportFatalException(
+    message: string,
+    stack: StackFrame[],
+    exceptionId: number,
+  ): void;
+  reportSoftException(
+    message: string,
+    stack: StackFrame[],
+    exceptionId: number,
+  ): void;
+  dismissRedbox(): void;
+  reportException(data: ExceptionData): void;
+};
+
+// #endregion
+// #region NativeRedBox
+
+interface NativeRedBoxSpec {
+  setExtraData(extraData: object, forIdentifier: string): void;
+  dismiss(): void;
+}
+
+/** Native module for the RedBox error overlay; null when unavailable. */
+export const NativeRedBox: NativeRedBoxSpec | null;
+
+// #endregion
+// #region NativeSourceCode
+
+interface SourceCodeConstants {
+  scriptURL: string;
+}
+
+/** Native module exposing source-code constants such as the bundle scriptURL. */
+export const NativeSourceCode: {
+  getConstants(): SourceCodeConstants;
+};
+
+// #endregion
+// #region PressabilityDebugView
+
+type Rect = Readonly<{
+  bottom?: number | null | undefined;
+  left?: number | null | undefined;
+  right?: number | null | undefined;
+  top?: number | null | undefined;
+}>;
+
+type RectOrSize = Rect | number;
+
+interface PressabilityDebugViewProps {
+  color: unknown;
+  hitSlop: RectOrSize | null | undefined;
+}
+
+/** Debug overlay that visualizes press targets when enabled via the Inspector. */
+export const PressabilityDebugView: React.ComponentType<PressabilityDebugViewProps>;
+
+// #endregion
diff --git a/packages/react-native/src/unstable-internals-do-not-use.js b/packages/react-native/src/unstable-internals-do-not-use.js
new file mode 100644
index 000000000000..20cb19edaec0
--- /dev/null
+++ b/packages/react-native/src/unstable-internals-do-not-use.js
@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ * @format
+ */
+
+'use strict';
+'use client';
+
+// ----------------------------------------------------------------------------
+// react-native/unstable-internals-do-not-use
+//
+// UNSTABLE WITH NO SEMVER GUARANTEES.
+// SHOULD NOT BE DEPENDED ON BY NEW CODE.
+//
+// This is a secondary entry point for frameworks and libraries that depend on
+// specific React Native internals, serving as a compatibility bridge.
+//
+// Consuming codebases must opt in via tsconfig.json:
+//   "customConditions": ["react-native-unstable-internals"]
+//
+// Having this entry point:
+// - Maintains a known list of which React Native internals are in use.
+// - Enables us to relocate supporting files more freely.
+// - Gives us time to decide on the future of these APIs (independent from
+//   removal of the Strict API opt out).
+//
+// The long term future of these exports is to formalize/delete them where
+// appropriate, and collapse this entry point.
+//
+// Replaces RFC0985
+// https://github.com/react-native-community/discussions-and-proposals/pull/985
+// where we reviewed internal APIs used in the ecosystem.
+//
+// IMPORTANT: Keep this file in sync with unstable-internals-do-not-use.d.ts.
+// ----------------------------------------------------------------------------
+
+// eslint-disable-next-line @react-native/monorepo/no-commonjs-exports
+module.exports = {
+  get AppContainer() {
+    return require('../Libraries/ReactNative/AppContainer').default;
+  },
+  get AssetSourceResolver() {
+    return require('../Libraries/Image/AssetSourceResolver').default;
+  },
+  get customDirectEventTypes() {
+    return require('../Libraries/Renderer/shims/ReactNativeViewConfigRegistry')
+      .customDirectEventTypes;
+  },
+  get DevLoadingView() {
+    return require('../Libraries/Utilities/DevLoadingView').default;
+  },
+  get getDevServer() {
+    return require('../Libraries/Core/Devtools/getDevServer').default;
+  },
+  get HMRClient() {
+    return require('../Libraries/Utilities/HMRClient').default;
+  },
+  get NativeExceptionsManager() {
+    return require('../Libraries/Core/NativeExceptionsManager').default;
+  },
+  get NativeRedBox() {
+    return require('../Libraries/NativeModules/specs/NativeRedBox').default;
+  },
+  get NativeSourceCode() {
+    return require('../Libraries/NativeModules/specs/NativeSourceCode').default;
+  },
+  get PressabilityDebugView() {
+    return require('../Libraries/Pressability/PressabilityDebug')
+      .PressabilityDebugView;
+  },
+};
diff --git a/packages/react-native/types/tsconfig.json b/packages/react-native/types/tsconfig.json
deleted file mode 100644
index bb7659500b10..000000000000
--- a/packages/react-native/types/tsconfig.json
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  "compilerOptions": {
-    "module": "commonjs",
-    "lib": ["es6"],
-    "strict": false,
-    "noImplicitAny": true,
-    "noImplicitThis": true,
-    "strictFunctionTypes": true,
-    "strictNullChecks": true,
-    "types": [],
-    "jsx": "react",
-    "noEmit": true,
-    "forceConsistentCasingInFileNames": true,
-    "paths": {"react-native": ["."]}
-  },
-  "include": ["**/*.d.ts", "../__typetests__/**/*"]
-}
diff --git a/packages/rn-tester/IntegrationTests/IntegrationTestsApp.js b/packages/rn-tester/IntegrationTests/IntegrationTestsApp.js
index c1f9cf2c760a..1cbc4335348f 100644
--- a/packages/rn-tester/IntegrationTests/IntegrationTestsApp.js
+++ b/packages/rn-tester/IntegrationTests/IntegrationTestsApp.js
@@ -10,7 +10,8 @@
 
 'use strict';
 
-require('react-native/Libraries/Core/InitializeCore');
+require('react-native/setup-env');
+
 const React = require('react');
 const ReactNative = require('react-native');
 
diff --git a/packages/typescript-config/README.md b/packages/typescript-config/README.md
index d58ee3b56455..bf53f0c39a6a 100644
--- a/packages/typescript-config/README.md
+++ b/packages/typescript-config/README.md
@@ -9,25 +9,18 @@ This package provides the default `tsconfig.json` used by newly built React Nati
 
 This template is customized for specific versions of React Native, and should be updated in sync with the rest of your app.
 
-## Strict TypeScript API
+## Opting out of the Strict TypeScript API (default in 0.87)
 
-To opt into the new [strict TypeScript API](https://reactnative.dev/blog/2025/06/12/moving-towards-a-stable-javascript-api#strict-typescript-api-opt-in) you can extend from `@react-native/typescript-config/strict`
+To opt out of the new [Strict TypeScript API](https://reactnative.dev/docs/strict-typescript-api) you can extend from `@react-native/typescript-config/strict`
 
-```jsonc
-{
-  "extends": "@react-native/typescript-config/strict",
-  // ...
-}
-```
-
-or alternatively add the `customConditions` yourself:
+If your app still needs access to deep `'react-native/Libraries/*'` imports (deprecated in 0.80), you can opt out via `customConditions` in your `tsconfig.json`:
 
 ```jsonc
 {
   "extends": "@react-native/typescript-config",
   "compilerOptions": {
     // ...
-    "customConditions": ["react-native-strict-api", "react-native"]
+    "customConditions": ["react-native", "react-native-legacy-deep-imports"]
   }
 }
 ```
diff --git a/packages/typescript-config/package.json b/packages/typescript-config/package.json
index a9bdc0e273b4..5e2b217934de 100644
--- a/packages/typescript-config/package.json
+++ b/packages/typescript-config/package.json
@@ -16,7 +16,6 @@
   ],
   "bugs": "https://github.com/react/react-native/issues",
   "exports": {
-    ".": "./tsconfig.json",
-    "./strict": "./tsconfig.strict.json"
+    ".": "./tsconfig.json"
   }
 }
diff --git a/packages/typescript-config/tsconfig.strict.json b/packages/typescript-config/tsconfig.strict.json
deleted file mode 100644
index c060fa2a4191..000000000000
--- a/packages/typescript-config/tsconfig.strict.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "./tsconfig.json",
-  "display": "React Native (Strict)",
-  "compilerOptions": {
-    "customConditions": ["react-native-strict-api", "react-native"]
-  }
-}
diff --git a/packages/virtualized-lists/package.json b/packages/virtualized-lists/package.json
index aca2c989aaf6..4ce33c821105 100644
--- a/packages/virtualized-lists/package.json
+++ b/packages/virtualized-lists/package.json
@@ -21,8 +21,8 @@
   },
   "exports": {
     ".": {
-      "react-native-strict-api": "./types_generated/index.d.ts",
-      "types": "./index.d.ts",
+      "react-native-legacy-deep-imports": "./index.d.ts",
+      "types": "./types_generated/index.d.ts",
       "default": "./index.js"
     },
     "./*": {
diff --git a/scripts/js-api/build-types/buildGeneratedTypes.js b/scripts/js-api/build-types/buildGeneratedTypes.js
index 1408b1625b50..3ef71abc2d13 100644
--- a/scripts/js-api/build-types/buildGeneratedTypes.js
+++ b/scripts/js-api/build-types/buildGeneratedTypes.js
@@ -55,26 +55,10 @@ async function buildGeneratedTypes(): Promise<Set<string>> {
     }
   }
 
-  await Promise.all([
-    fs.copyFile(
-      path.join(__dirname, 'templates', 'tsconfig.json'),
-      path.join(
-        PACKAGES_DIR,
-        'react-native',
-        TYPES_OUTPUT_DIR,
-        'tsconfig.json',
-      ),
-    ),
-    fs.copyFile(
-      path.join(__dirname, 'templates', 'tsconfig.test.json'),
-      path.join(
-        PACKAGES_DIR,
-        'react-native',
-        TYPES_OUTPUT_DIR,
-        'tsconfig.test.json',
-      ),
-    ),
-  ]);
+  await fs.copyFile(
+    path.join(__dirname, 'templates', 'tsconfig.json'),
+    path.join(PACKAGES_DIR, 'react-native', TYPES_OUTPUT_DIR, 'tsconfig.json'),
+  );
 
   if (allErrors.length > 0) {
     console.error(
diff --git a/scripts/run-ci-javascript-tests.js b/scripts/run-ci-javascript-tests.js
index 7992b46fbcce..aed03f7f812a 100644
--- a/scripts/run-ci-javascript-tests.js
+++ b/scripts/run-ci-javascript-tests.js
@@ -81,7 +81,7 @@ try {
   );
 
   describe('Test: TypeScript tests');
-  execAndLog(`${YARN_BINARY} run test-typescript`);
+  execAndLog(`${YARN_BINARY} run test-typescript-legacy`);
 } catch (e) {
   if (e instanceof ExecError) {
     console.error(e.message);