React Native V8 JSI adapter

A V8 adapter implemention of the JSI interface for the react-native framework.

Building

Windows

Initial Windows Build Setup

1. Download and Install
   Windows 10 Windows SDK:
   https://developer.microsoft.com/en-us/windows/downloads/sdk-archive
   Note: Windows SDK has to be Windows 10 version, NOT Windows 11
2. Download and Install
   Microsoft Visual C++ Redistributable x64
   Microsoft Visual C++ Redistributable x86
   https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist
3. Download and Install
   Visual Studio 2022
   https://visualstudio.microsoft.com/vs
   In Visual Studio Setup, Select the following Individual Components:
   • MSVC v143 - VS 2022 C++ x64/x86 Spectre-mitigated libs (Latest)
   • C++ ATL for latest v143 build tools with Spectre Mitigations (x86 & x64)
4. Enable PowerShell script execution
   Launch Cmd as Administrator

   powershell Set-ExecutionPolicy RemoteSigned
5. Perform Initial Build
   Launch Cmd as Standard user, NOT Administrator
   From V8-Jsi Repo directory:

   powershell ./localbuild.ps1
   

Windows Build

To build Win32 X64 Debug:

Launch Cmd as Standard user, NOT Administrator
From V8-Jsi Repo Directory:

powershell ./localbuild.ps1 -NoSetup

To build the specific platform and flavor, use appropriate build flags:

powershell ./localbuild.ps1 -NoSetup -Platform x86 -Configuration Release 

Android

From the android directory, run ./localbuild.sh in a bash terminal; by default, this will build the x64 debug version of the binary for Android. To build for other platforms and flavors, supply the --platform (or -p) and the --flavor (or -f) flags, like so:

./localbuild.sh --platform <platform-name> --flavor <flavor-name>

The following platforms and flavors are supported:

• <platform-name>: x64 (default), x86, arm, arm64
• <flavor-name> debug (default), ship

This build requires Ubuntu 18.04 or below, or Debian 8 or later.

Currently, the Android version builds an older release of V8 (7.0.276.32) and uses Android NDK r21b and the JSI headers from React Native 0.66 (see build.config). The Windows version builds V8 9.5 and uses the JSI headers from React Native 0.65.5. Android also currently uses a different V8Runtime (V8Runtime.h) than Windows (V8JsiRuntime.h). Future Android releases will sync the Android dependencies with Windows and support newer Linux versions.

Building with WSL2 on Windows 10/11

• Enable Windows Subsystem for Linux
• Install debian: wsl --install -d Debian
• Install minimal dependencies on the Debian VM: sudo apt install pkg-config python python3 curl unzip
• Build with ./localbuild.sh (as above)

[EXPERIMENTAL!] Building the main code with WSL2 on Windows 10/11

• Enable Windows Subsystem for Linux
• Install debian: wsl --install -d Debian
• Install PowerShell in the Debian VM
• Install minimal dependencies on the Debian VM: sudo apt install lsb-release
• Make sure you have at least 15Gb of disk space on the drive where the WSL image lives (usually C:)
• Build with pwsh ./localbuild.ps1 -AppPlatform android
• If setup is completed succesfully, build incrementally with pwsh ./localbuild.ps1 -AppPlatform android -NoSetup

Out-of-sync issues

Until the JSI headers find a more suitable home, they're currently duplicated between the various repos. Code in jsi\jsi should be synchronized with the matching version of JSI from react-native (from https://github.com/facebook/hermes/tree/master/API/jsi/jsi).

Build script patches

To regenerate after manual fix-ups, run:

• git diff --output=..\..\..\..\scripts\patch\build.diff --ignore-cr-at-eol from \build\v8build\v8\build\.
• git diff --output=..\..\..\scripts\patch\src.diff --ignore-cr-at-eol from \build\v8build\v8\.
• git diff --output=..\..\..\..\..\scripts\patch\zlib.diff --ignore-cr-at-eol from \build\v8build\v8\third_party\zlib\.

Contributing

See Contributing guidelines for how to setup your fork of the repo and start a PR to contribute to React Native V8 JSI adapter.

License

The V8 JSI adapter, and all newly contributed code is provided under the MIT License. Portions of the JSI interface derived from Hermes are copyright Facebook.

Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.