SwiftPrivateImportExample

Example project for how to use @_private(sourceFile:).

How it works

We need a module compiled with -enable-private-imports to be able to use private APIs in client side via @_private(sourceFile:).

It will then store the information on a swiftmodule file.

We can workaround the check by adding -enable-private-imports to the swiftinterface file.

But the compiler can't deserialize the private API - filename - private discriminator information from the swiftinterface file.

Source available example / BKit

Prepare

• Compile AKit with -enable-private-imports (For Xcode project, set it in OTHER_SWIFT_FLAGS)
• Import AKit.framework (with the swiftmodule file) in BKit
• Use @_private(sourceFile:) in BKit and compile it

Non source SDK example / SwiftUIPrivateExample 🙅

Since we lack of SwiftUICore.swiftmodule/*-apple-macos.swiftmodule file in SDK, I have not found a way to use it yet.

We can get such file in location like /Applications/Xcode-16.1.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/15.1/SwiftUICore.swiftmodule

But it is not build with -enable-private-imports so some extra work is still needed.

Prepare

1. Patch the private SDK

./Scripts/patch_sdk.sh macosx SwiftUICore ./SDKPatches/patch.swiftinterface

2. Clean up module cache

rm -rf ~/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/SwiftUI-*.swiftmodule
rm -rf ~/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/SwiftUICore-*.swiftmodule

Build

Build and run the project in Xcode.

Clean up

1. Remove the SDK patch

./Scripts/unpatch_sdk.sh macosx SwiftUICore

2. Clean up module cache

rm -rf ~/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/SwiftUI-*.swiftmodule
rm -rf ~/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/SwiftUICore-*.swiftmodule