[Android] react-android's prefab has no react/renderer/components/scrollview headers, so a library cannot include ScrollView's component descriptor

packages/react-native/ReactAndroid/build.gradle.ktsを読み、特に219～227行付近のpreparePrefabのコンポーネントフォルダー一覧を確認して、エクスポートされたコンポーネントヘッダーと比較してください。Issueでは、libreactnative.soにScrollViewのシンボルが存在する一方で、rrc_scrollviewが欠落していると報告されています。不足しているscrollviewヘッダーのエクスポートを追加し、prefabにヘッダーが含まれることと、再現用コードのネイティブビルドでScrollViewComponentDescriptor.hが解決されることを確認してください。

Description

The reactnative prefab module in the react-android AAR carries the headers of react/renderer/components/view, image, root, text and textinput, but none of react/renderer/components/scrollview. libreactnative.so defines ScrollView's shadow node and state (ScrollViewShadowNode::layout, ScrollViewShadowNode::updateStateIfNeeded, ScrollViewState::getContentSize, ScrollViewComponentName), so a library or app that builds against the prebuilt AAR can link them but cannot include ScrollViewShadowNode.h, ScrollViewComponentDescriptor.h or ScrollViewState.h; for example, to register a component descriptor that extends ScrollView's.

preparePrefab in packages/react-native/ReactAndroid/build.gradle.kts lists a Pair for each exported component folder (// rrc_textinput and its platform/android/ folder among them) and has none for rrc_scrollview: https://github.com/react/react-native/blob/1273ca128fa378e231dd351a65fb7d63fe0b6526/packages/react-native/ReactAndroid/build.gradle.kts#L219-L227

Steps to reproduce

1. git clone https://github.com/YevheniiKotyrlo/rn-prefab-scrollview-headers-repro && cd rn-prefab-scrollview-headers-repro
2. ./reproduce.sh. It installs ReproducerApp (React Native 0.90.0-nightly-20261111-1273ca128) and runs ./gradlew :app:externalNativeBuildDebug -PreactNativeArchitectures=arm64-v8a. The app's src/main/jni/CMakeLists.txt is the default app setup plus one file, scrollview/ScrollViewDescriptorProvider.cpp:

#include <react/renderer/components/view/ViewComponentDescriptor.h>
#include <react/renderer/components/scrollview/ScrollViewComponentDescriptor.h>

namespace facebook::react {

ComponentDescriptorProvider scrollViewComponentDescriptorProvider() {
  return concreteComponentDescriptorProvider<ScrollViewComponentDescriptor>();
}

} // namespace facebook::react

Expected: the scrollview include resolves from the prefab, as the view include on the line before it does.

Seen: the build stops at the scrollview include, and the prefab's react/renderer/components holds no scrollview folder. The release AAR from the same nightly has none either, while its jni/arm64-v8a/libreactnative.so defines the ScrollView symbols above.

React Native Version

0.90.0-nightly-20261111-1273ca128

Affected Platforms

Runtime - Android, Build - Windows

Output of npx @react-native-community/cli info

System:
  OS: Windows 11 10.0.26300
  CPU: "(32) x64 AMD Ryzen 9 9950X3D 16-Core Processor          "
  Memory: 181.10 GB / 255.67 GB
Binaries:
  Node:
    version: 26.12.1
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 1.22.22
    path: C:\Users\<user>\AppData\Roaming\npm\yarn.CMD
  npm:
    version: 12.2.1
    path: C:\Program Files\nodejs\npm.CMD
  Watchman: Not Found
SDKs:
  Android SDK: Not Found
  Windows SDK:
    AllowDevelopmentWithoutDevLicense: Enabled
    Versions:
      - 10.0.19041.0
      - 10.0.26100.0
IDEs:
  Android Studio: AI-262.9437.185.2621.16467767
  Visual Studio: Not Found
Languages:
  Java:
    version: 17.0.20.1
    path: C:\Program Files\Microsoft\jdk-17.0.20.101-hotspot\bin\javac.EXE
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli":
    installed: 21.0.0-alpha.1
    wanted: 21.0.0-alpha.1
  react:
    installed: 19.3.0
    wanted: 19.3.0
  react-native:
    installed: 0.90.0-nightly-20261111-1273ca128
    wanted: 0.90.0-nightly-20261111-1273ca128
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

MINGW64_NT-10.0-26300 x86_64, node v26.12.1, openjdk version "17.0.20.1" 2026-08-18 LTS
react-native 0.90.0-nightly-20261111-1273ca128
== ./gradlew :app:externalNativeBuildDebug -PreactNativeArchitectures=arm64-v8a
C/C++: ReproducerApp/android/app/src/main/jni/scrollview/ScrollViewDescriptorProvider.cpp:4:10: fatal error: 'react/renderer/components/scrollview/ScrollViewComponentDescriptor.h' file not found
BUILD FAILED in 35s
== react/renderer/components in react-android-0.90.0-nightly-20261111-1273ca128-SNAPSHOT-debug/prefab/modules/reactnative/include
androidtextinput
FBReactNativeSpec
image
root
text
textinput
view
SUMMARY: the react-android prefab has no react/renderer/components/scrollview headers

MANDATORY Reproducer

https://github.com/YevheniiKotyrlo/rn-prefab-scrollview-headers-repro

Screenshots and Videos

No response