From 1bd6e102d69b50eb3d68898cf741885fd7220f54 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Thu, 30 Jan 2025 05:57:16 -0800
Subject: [PATCH] Expose new method in Fabric renderer to access root instance
 from root tag (#49011)
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Summary:

Changelog: [internal]

This exposes the new `getPublicInstanceFromRoot` method from the React renderer in our RN façades, preparing for the new change to implement the document interface in RN.

Reviewed By: javache

Differential Revision: D68767143
---
 .../Libraries/ReactNative/RendererImplementation.js      | 9 +++++++++
 .../Libraries/Renderer/shims/ReactNativeTypes.js         | 3 +++
 .../__tests__/__snapshots__/public-api-test.js.snap      | 1 +
 3 files changed, 13 insertions(+)

diff --git a/packages/react-native/Libraries/ReactNative/RendererImplementation.js b/packages/react-native/Libraries/ReactNative/RendererImplementation.js
index e2d25090794b94..7ff71985c03987 100644
--- a/packages/react-native/Libraries/ReactNative/RendererImplementation.js
+++ b/packages/react-native/Libraries/ReactNative/RendererImplementation.js
@@ -162,3 +162,12 @@ export function getPublicInstanceFromInternalInstanceHandle(
     internalInstanceHandle,
   );
 }
+
+export function getPublicInstanceFromRootTag(
+  rootTag: number,
+): mixed /*PublicRootInstance | null*/ {
+  // This is only available in Fabric
+  return require('../Renderer/shims/ReactFabric').default.getPublicInstanceFromRootTag(
+    rootTag,
+  );
+}
diff --git a/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js b/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
index 7a3c7410ab664a..f7ed3267d017bb 100644
--- a/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
+++ b/packages/react-native/Libraries/Renderer/shims/ReactNativeTypes.js
@@ -262,6 +262,9 @@ export type ReactFabricType = {
   getPublicInstanceFromInternalInstanceHandle(
     internalInstanceHandle: InternalInstanceHandle,
   ): PublicInstance | PublicTextInstance | null,
+  getPublicInstanceFromRootTag(
+    rootTag: number,
+  ): PublicRootInstance | null,
   ...
 };
 
diff --git a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
index 6221e95f846176..009c70592fe783 100644
--- a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
+++ b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
@@ -7621,6 +7621,7 @@ declare export function getNodeFromInternalInstanceHandle(
 declare export function getPublicInstanceFromInternalInstanceHandle(
   internalInstanceHandle: InternalInstanceHandle
 ): mixed;
+declare export function getPublicInstanceFromRootTag(rootTag: number): mixed;
 "
 `;