Libraries using `includesGeneratedCode: true` that pre-generated their codegen output with React Native < 0.84 fail to compile on iOS when consumed by an RN 0.84 app.

Description

PR #54919 ("Fix backwards-compat for ModuleConstants<::Builder>"), merged Dec 17 2025 and shipped in 0.84.0, introduced a ResultT type alias requirement in Constants::Builder structs. The updated RCTTypedModuleConstants.h now resolves the constants type via Builder::ResultT, but libraries with pre-shipped codegen (generated by older RN versions) don't have this alias.

The catch-22

Regenerating codegen with @react-native/codegen@0.84.0 produces output with completely different JSI structure (no Delegate class, methodMap_ pattern instead, ModuleConstants<Constants> vs ModuleConstants<Builder>) that is incompatible with older RN versions. This means there is no single codegen version that produces output working across both pre-0.84 and 0.84+ apps.

Documentation promise

The codegen-cli documentation states:

No need to worry about Codegen version mismatch between what is used by the app, and what was used during library development.

This implies that includesGeneratedCode provides forwards compatibility — the shipped codegen output should work with future RN versions. The ResultT change in 0.84 breaks this contract.

Impact on library developers

Library developers who need to support a range of RN versions (e.g. 0.70+ through 0.84) are left with no clean solution:

• Option A: Generate with old codegen → broken on 0.84+
• Option B: Generate with 0.84 codegen → broken on older versions
• Option C: Manually patch using ResultT = Constants; into old-codegen output → works, but fragile, undocumented, and defeats the purpose of includesGeneratedCode

This is especially problematic for SDKs with large enterprise customers who cannot easily migrate React Native versions but still expect support for new SDK features and bug fixes.

Suggested fix

The ResultT resolution in RCTTypedModuleConstants.h should gracefully handle the case where Builder::ResultT doesn't exist (e.g. fall back to checking for Builder::build() return type, or default to the existing Builder behavior). This would maintain true backwards compatibility for libraries with pre-shipped codegen.

Alternatively, the codegen CLI docs should clearly document:

1. Which RN versions' codegen output is compatible with which app versions
2. That includesGeneratedCode does NOT guarantee forwards compatibility
3. A recommended workaround for library developers supporting multiple RN versions

Steps to reproduce

1. Create a TurboModule library with getConstants() and includesGeneratedCode: true
2. Generate codegen with RN 0.77 (or any version < 0.84)
3. Create an RN 0.84 app that consumes the library
4. Build for iOS with New Architecture enabled
5. Observe the no type named 'ResultT' compilation error

React Native Version

0.84.0

Affected Platforms

Build - iOS (New Architecture)

Related

• #54919 — PR that introduced the ResultT requirement
• #48621 — includesGeneratedCode doesn't prevent app-level codegen parsing
• reactwg/react-native-new-architecture#272 — Discussion about codegen backwards compatibility

Steps to reproduce

1. Create a library which includes generated codegen artifacts
2. Generate the artifacts in any version below 0.84.x, for example 0.77.x
3. Import the library in a sample running RN 0.84.x
4. Attempt to build on iOS, it will fail due to missing type

React Native Version

0.84.0

Areas

Codegen

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

info Fetching system and libraries information...
System:
  OS: macOS 15.3
  CPU: (10) arm64 Apple M1 Pro
  Memory: 131.97 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 24.8.0
    path: /Users/konradgapinski/.asdf/installs/nodejs/24.8.0/bin/node
  Yarn: Not Found
  npm:
    version: 11.6.0
    path: /Users/konradgapinski/.asdf/plugins/nodejs/shims/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/konradgapinski/.asdf/shims/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK:
    API Levels:
      - "27"
      - "28"
      - "29"
      - "30"
      - "31"
      - "32"
      - "33"
      - "34"
      - "35"
      - "36"
    Build Tools:
      - 30.0.2
      - 30.0.3
      - 32.0.0
      - 33.0.0
      - 33.0.1
      - 33.0.2
      - 33.0.3
      - 34.0.0
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-34 | Google APIs ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.2 AI-252.25557.131.2521.14432022
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 21.0.9
    path: /usr/bin/javac
  Ruby:
    version: 3.2.1
    path: /Users/konradgapinski/.asdf/shims/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.1.0
    wanted: 20.1.0
  react:
    installed: 19.2.3
    wanted: 19.2.3
  react-native:
    installed: 0.84.0
    wanted: 0.84.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

Showing Recent Errors Only
CompileC /Users/konradgapinski/Library/Developer/Xcode/DerivedData/DebugApp-aqezihaevrrbhcgvbvgonkjjisow/Build/Intermediates.noindex/Pods.build/Debug-iphoneos/scandit-react-native-datacapture-core.build/Objects-normal/arm64/ScanditDataCaptureCore-f2d19fb949f3dc68ad8bf1fdb06dc3e3.o /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.mm normal arm64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler (in target 'scandit-react-native-datacapture-core' from project 'Pods')
    cd /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/ios/Pods
    /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/ios/Pods/../../node_modules/react-native/scripts/xcode/ccache-clang.sh -x objective-c++ -target arm64-apple-ios15.1 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fno-color-diagnostics -std\=c++20 -stdlib\=libc++ -fobjc-arc -fmodules -fmodules-cache-path\=/Users/konradgapinski/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -fmodules-prune-interval\=86400 -fmodules-prune-after\=345600 -fbuild-session-file\=/Users/konradgapinski/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror\=non-modular-include-in-framework-module -Wno-trigraphs -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes 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/Users/konradgapinski/Library/Developer/Xcode/DerivedData/DebugApp-aqezihaevrrbhcgvbvgonkjjisow/Build/Intermediates.noindex/Pods.build/Debug-iphoneos/scandit-react-native-datacapture-core.build/Objects-normal/arm64/ScanditDataCaptureCore-f2d19fb949f3dc68ad8bf1fdb06dc3e3.dia -c /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.mm -o /Users/konradgapinski/Library/Developer/Xcode/DerivedData/DebugApp-aqezihaevrrbhcgvbvgonkjjisow/Build/Intermediates.noindex/Pods.build/Debug-iphoneos/scandit-react-native-datacapture-core.build/Objects-normal/arm64/ScanditDataCaptureCore-f2d19fb949f3dc68ad8bf1fdb06dc3e3.o

In file included from /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.mm:9:
In file included from /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.h:16:
In file included from /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/generated/ScanditReactNativeDatacaptureCoreSpec/ScanditReactNativeDatacaptureCoreSpec.h:25:
/Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/ios/Pods/Headers/Public/RCTTypeSafety/RCTTypeSafety/RCTTypedModuleConstants.h:62:28: error: no type named 'ResultT' in 'JS::NativeScanditDataCaptureCore::Constants::Builder'
   62 |   using type = typename T::ResultT;
      |                ~~~~~~~~~~~~^~~~~~~
/Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/ios/Pods/Headers/Public/RCTTypeSafety/RCTTypeSafety/RCTTypedModuleConstants.h:73:1: note: in instantiation of template class 'facebook::react::detail::ResolveConstantsType<JS::NativeScanditDataCaptureCore::Constants::Builder>' requested here
   73 | using ModuleConstants = _RCTTypedModuleConstants<void (^)(typename detail::ResolveConstantsType<T>::type)> *;
      | ^
In file included from /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.mm:9:
In file included from /Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/Sources/ScanditDataCaptureCore.h:16:
/Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/node_modules/scandit-react-native-datacapture-core/ios/generated/ScanditReactNativeDatacaptureCoreSpec/ScanditReactNativeDatacaptureCoreSpec.h:73:21: note: in instantiation of template type alias 'ModuleConstants' requested here
   73 | - (facebook::react::ModuleConstants<JS::NativeScanditDataCaptureCore::Constants::Builder>)constantsToExport;
      |                     ^
1 error generated.

/Users/konradgapinski/worktrees/SDC-29924/data-capture-sdk/frameworks/react-native/compatibility-check/latest/new-arch/DebugApp/ios/Pods/Headers/Public/RCTTypeSafety/RCTTypeSafety/RCTTypedModuleConstants.h:62:28: No type named 'ResultT' in 'JS::NativeScanditDataCaptureCore::Constants::Builder'

MANDATORY Reproducer

https://github.com/konradgapinski/RN-0.84.x-Codegen-Breaking-Changes#

Screenshots and Videos

No response

从 RCTTypedModuleConstants.h 和 PR #54919 开始，了解 Constants::Builder 如何解析 ResultT。在 RN 0.84 应用中使用 0.84 之前生成的代码重现 iOS New Architecture 失败，然后验证所述版本之间的兼容性；检查 codegen CLI 文档，确认是否需要更新相关指导。