Add Swift Package to Watch target (Expo)

withSwiftPackages.js

// this function is called from patched expo-apple-targets

// register all packages here
const swiftPackages = [
    {
        name: 'PackageName',
        url: 'https://github.com/...',
        version: '1.0.0'
    }
]

const withSwiftPackages = (xcode, project) => {
    swiftPackages.forEach(pkg => {
        const watchTarget = project.rootObject.getMainAppTarget("watchos")
        const watchFrameworks = watchTarget.getBuildPhase(xcode.PBXFrameworksBuildPhase)

        // create SwiftPackageReference
        const reference = xcode.XCRemoteSwiftPackageReference.create(project, {
            repositoryURL: pkg.url,
            requirement: {
                kind: 'upToNextMajorVersion',
                value: pkg.version
            }
        })
        
        // create SwiftPackageDependency
        const dependency = xcode.XCSwiftPackageProductDependency.create(project, {
            package: reference.uuid,
            productName: pkg.name
        })

        // add to PBXBuildFile
        const buildFile = xcode.PBXBuildFile.create(project, {
            productRef: dependency
        })

        // add to watchOS frameworks
        watchFrameworks.props.files.push(buildFile)

        const productDependencies = [
            ...watchTarget.props.packageProductDependencies ?? [],
            dependency
        ]

        // add watchos productDependencies
        watchTarget.props.packageProductDependencies = productDependencies

        const packageReferences = [
            ...project.rootObject.props.packageReferences ?? [],
            reference
        ]

        // add main project packageReferences
        project.rootObject.props.packageReferences = packageReferences
    })
}

module.exports = withSwiftPackages