example-spi.md

Package.swift

// swift-tools-version: 5.9
import PackageDescription

let package = Package(
   name: "CaptureSDK",
   products: [
       .library(name: "Capture", targets: ["Capture"]),
       .library(name: "CaptureUI", targets: ["CaptureUI"]),
   ],
   targets: [
        .target(name: "Capture"),
        .target(name: "CaptureUI", dependencies: ["Capture"]),
   ]
)

Sources/Capture/Capture.swift

//
// Capture.swift
// CaptureSDK/Capture
//
public import AVFoundation

@_spi(CaptureUI)
public class CameraService {
    public init(session: AVCaptureSession) {
    }
}

Sources/CaptureUI/CaptureUI.swift

//
// CaptureUI.swift
// CaptureSDK/CaptureUI
//
@_spi(CaptureUI) import Capture
// Can now use CameraService() …