Summary:

See [**RFC0894: Removing deep imports from react-native**](react-native-community/discussions-and-proposals#894)

Adds a `'react-native/unstable-internals-do-not-use'` entry point that acts as an explicit, opt-in escape hatch for frameworks and libraries that depend on specific React Native internals.

Follows (and supersedes) react-native-community/discussions-and-proposals#985.

Resolves T270727304.

**Motivation**

- Maintains a known list of which React Native internals are still in use.
- Decouples removal of the Strict API opt-out from the longer-term decisions about these APIs.
- Lets us relocate supporting source files freely, since consumers reference this subpath instead of deep internal paths.

**Notes**

- Reuses the runtime **object-with-getter pattern** (same as `index.js`), to avoid any native module side effects caused by loading adjacent file exports.
    - e.g. in Expo, [`hmrUtils.js`](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/hmrUtils.native.ts?fbclid=IwY2xjawS7GjNwZG9mA2V4dG4DYWVtAjExAGJyaWQRMTZ1ckEwU05oWUw2bDBVN21zcnRjBmFwcF9pZAEwAAEen3UuX4Ig-RD3n1ULZIHIHq21Mfk_ci9b2SxquY7UkngDs6qhnRt5YQlb8Os_aem_ylJy40egSOl1qhZ9bA9HTA) is designed to be run early in RN startup — preserve the lazy require characteristic and do not break this.
- TypeScript defs on this API are minimal, with complex internal input/handle types reduced to `unknown`. As with D110602194, these are intended to be feature-locked.

**Exposed internals and known consumers**

NOTE: The exports the community needs have reduced slightly since the spreadsheet in RFC0895 and would almost all align with `devsupport`. However, we're explicitly leaving a decision to formalise until later, and we may need to add in extra APIs quickly based on RC feedback.

| Export | Source module | Known consumers |
|---|---|---|
| `AppContainer` | `Libraries/ReactNative/AppContainer` | react-native-screens ([DebugContainer.tsx](https://github.com/software-mansion/react-native-screens/blob/6f38d76129d40cc8145d06b98f885b508fa7bf2d/src/components/DebugContainer.tsx#L5)) |
| `AssetSourceResolver` | `Libraries/Image/AssetSourceResolver` | Re.pack ([IncludeModules.ts](https://github.com/callstack/repack/blob/2498b3a426203daa4b81c7e6f7a88e86d88e77b9/packages/repack/src/modules/IncludeModules.ts#L9)) |
| `customDirectEventTypes` | `Libraries/Renderer/shims/ReactNativeViewConfigRegistry` | react-native-gesture-handler ([customDirectEventTypes.ts](https://github.com/software-mansion/react-native-gesture-handler/blob/ee147abf364bef48a02d3cf437572b4dddd30bec/packages/react-native-gesture-handler/src/handlers/customDirectEventTypes.ts#L2)) |
| `DevLoadingView` | `Libraries/Utilities/DevLoadingView` | Expo ([hmrUtils.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/hmrUtils.native.ts)), Re.pack ([WebpackHMRClient.ts](https://github.com/callstack/repack/blob/2498b3a426203daa4b81c7e6f7a88e86d88e77b9/packages/repack/src/modules/WebpackHMRClient.ts)) |
| `getDevServer` | `Libraries/Core/Devtools/getDevServer` | Expo ([getDevServer.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/getDevServer.native.ts), [hmrUtils.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/hmrUtils.native.ts), [base.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/dom/base.ts), [getDevServer.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/metro-runtime/src/getDevServer.native.ts), [devServerEndpoints.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/log-box/src/utils/devServerEndpoints.ts), [getConnectionInfo.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/devtools/src/getConnectionInfo.native.ts), [index.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo-router/src/getDevServer/index.native.ts)) |
| `HMRClient` | `Libraries/Utilities/HMRClient` | Expo ([metroServerLogs.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/metro-runtime/src/metroServerLogs.native.ts)) |
| `NativeExceptionsManager` | `Libraries/Core/NativeExceptionsManager` | Expo ([hmrUtils.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/hmrUtils.native.ts)), Re.pack ([WebpackHMRClient.ts](https://github.com/callstack/repack/blob/2498b3a426203daa4b81c7e6f7a88e86d88e77b9/packages/repack/src/modules/WebpackHMRClient.ts)) |
| `NativeRedBox` | `Libraries/NativeModules/specs/NativeRedBox` | Expo ([hmrUtils.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/async-require/hmrUtils.native.ts)), Re.pack ([WebpackHMRClient.ts](https://github.com/callstack/repack/blob/2498b3a426203daa4b81c7e6f7a88e86d88e77b9/packages/repack/src/modules/WebpackHMRClient.ts)) |
| `NativeSourceCode` | `Libraries/NativeModules/specs/NativeSourceCode` | Expo ([getBundleUrl.native.ts](https://github.com/expo/expo/blob/2d07e3a17f4be2284bbf579d8825fe32f762ce1a/packages/expo/src/utils/getBundleUrl.native.ts)) |
| `PressabilityDebugView` | `Libraries/Pressability/PressabilityDebug` | react-native-gesture-handler ([PressabilityDebugView.tsx](https://github.com/software-mansion/react-native-gesture-handler/blob/ee147abf364bef48a02d3cf437572b4dddd30bec/packages/react-native-gesture-handler/src/handlers/PressabilityDebugView.tsx#L2)) |

**Alternative names**

- `unstable-frameworks`
- `unstable-devsupport`
- `frameworks-private-interface` (mirroring `ReactPrivateInterface.js`) — this is likely a future stable shape candidate.

Changelog: [Internal]

Reviewed By: rubennorte

Differential Revision: D110911864

Summary:

See [**RFC0894: Removing deep imports from react-native**](react-native-community/discussions-and-proposals#894)

TODO: Finish tidying up description below.

Differential Revision: D110458670