Remove legacy Hermes C++ code and HERMES_V1_ENABLED compile definition (#56731)#56731
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cipolleschi wants to merge 1 commit intofacebook:mainfrom
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Remove legacy Hermes C++ code and HERMES_V1_ENABLED compile definition (#56731)#56731cipolleschi wants to merge 1 commit intofacebook:mainfrom
cipolleschi wants to merge 1 commit intofacebook:mainfrom
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facebook#56731) Summary: - Remove all dead C++ code behind `!defined(HERMES_V1_ENABLED)` guards in `HermesExecutorFactory.cpp` and `HermesInstance.cpp` - Delete `Registration.h`, `Registration.cpp`, `ConnectionDemux.h`, `ConnectionDemux.cpp`, and `ConnectionDemuxTests.cpp` (entirely legacy code) - Remove `HERMES_V1_ENABLED` compile definition from `react-native-flags.cmake` - Remove `HERMES_V1_ENABLED` cache variable from Android `CMakeLists.txt` This is Phase 1 of removing legacy Hermes support. Since Hermes V1 is already the default on all platforms and the 0.86 branch has been cut, all legacy Hermes code is dead and can be safely removed. ## Changelog: [General][Breaking] - Remove Legacy Hermes from C++ code ## Test plan - [x] Android: `./gradlew :packages:rn-tester:android:app:assembleDebug` — BUILD SUCCEEDED - [x] iOS: `xcodebuild` rn-tester on iPhone 16 Pro simulator — BUILD SUCCEEDED Reviewed By: cortinico Differential Revision: D104228879
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#56731) Summary: - Remove all dead C++ code behind `!defined(HERMES_V1_ENABLED)` guards in `HermesExecutorFactory.cpp` and `HermesInstance.cpp` - Delete `Registration.h`, `Registration.cpp`, `ConnectionDemux.h`, `ConnectionDemux.cpp`, and `ConnectionDemuxTests.cpp` (entirely legacy code) - Remove `HERMES_V1_ENABLED` compile definition from `react-native-flags.cmake` - Remove `HERMES_V1_ENABLED` cache variable from Android `CMakeLists.txt` This is Phase 1 of removing legacy Hermes support. Since Hermes V1 is already the default on all platforms and the 0.86 branch has been cut, all legacy Hermes code is dead and can be safely removed. ## Changelog: [General][Breaking] - Remove Legacy Hermes from C++ code ## Test plan - [x] Android: `./gradlew :packages:rn-tester:android:app:assembleDebug` — BUILD SUCCEEDED - [x] iOS: `xcodebuild` rn-tester on iPhone 16 Pro simulator — BUILD SUCCEEDED Reviewed By: cortinico Differential Revision: D104228879
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facebook#56731) Summary: - Remove all dead C++ code behind `!defined(HERMES_V1_ENABLED)` guards in `HermesExecutorFactory.cpp` and `HermesInstance.cpp` - Delete `Registration.h`, `Registration.cpp`, `ConnectionDemux.h`, `ConnectionDemux.cpp`, and `ConnectionDemuxTests.cpp` (entirely legacy code) - Remove `HERMES_V1_ENABLED` compile definition from `react-native-flags.cmake` - Remove `HERMES_V1_ENABLED` cache variable from Android `CMakeLists.txt` This is Phase 1 of removing legacy Hermes support. Since Hermes V1 is already the default on all platforms and the 0.86 branch has been cut, all legacy Hermes code is dead and can be safely removed. ## Changelog: [General][Breaking] - Remove Legacy Hermes from C++ code ## Test plan - [x] Android: `./gradlew :packages:rn-tester:android:app:assembleDebug` — BUILD SUCCEEDED - [x] iOS: `xcodebuild` rn-tester on iPhone 16 Pro simulator — BUILD SUCCEEDED Reviewed By: cortinico Differential Revision: D104228879
meta-codesync Bot
pushed a commit
that referenced
this pull request
May 8, 2026
#56731) Summary: - Remove all dead C++ code behind `!defined(HERMES_V1_ENABLED)` guards in `HermesExecutorFactory.cpp` and `HermesInstance.cpp` - Delete `Registration.h`, `Registration.cpp`, `ConnectionDemux.h`, `ConnectionDemux.cpp`, and `ConnectionDemuxTests.cpp` (entirely legacy code) - Remove `HERMES_V1_ENABLED` compile definition from `react-native-flags.cmake` - Remove `HERMES_V1_ENABLED` cache variable from Android `CMakeLists.txt` This is Phase 1 of removing legacy Hermes support. Since Hermes V1 is already the default on all platforms and the 0.86 branch has been cut, all legacy Hermes code is dead and can be safely removed. ## Changelog: [General][Breaking] - Remove Legacy Hermes from C++ code ## Test plan - [x] Android: `./gradlew :packages:rn-tester:android:app:assembleDebug` — BUILD SUCCEEDED - [x] iOS: `xcodebuild` rn-tester on iPhone 16 Pro simulator — BUILD SUCCEEDED Reviewed By: cortinico Differential Revision: D104228879
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Summary:
!defined(HERMES_V1_ENABLED)guards inHermesExecutorFactory.cppandHermesInstance.cppRegistration.h,Registration.cpp,ConnectionDemux.h,ConnectionDemux.cpp, andConnectionDemuxTests.cpp(entirely legacy code)HERMES_V1_ENABLEDcompile definition fromreact-native-flags.cmakeHERMES_V1_ENABLEDcache variable from AndroidCMakeLists.txtThis is Phase 1 of removing legacy Hermes support. Since Hermes V1 is already the default on all platforms and the 0.86 branch has been cut, all legacy Hermes code
is dead and can be safely removed.
Changelog:
[General][Breaking] - Remove Legacy Hermes from C++ code
Test plan
./gradlew :packages:rn-tester:android:app:assembleDebug— BUILD SUCCEEDEDxcodebuildrn-tester on iPhone 16 Pro simulator — BUILD SUCCEEDEDReviewed By: cortinico
Differential Revision: D104228879