Create Swift package

Author: colemancda

Package.swift

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+// swift-tools-version: 6.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import CompilerPluginSupport
+import PackageDescription
+
+import class Foundation.FileManager
+import class Foundation.ProcessInfo
+
+// Note: the JAVA_HOME environment variable must be set to point to where
+// Java is installed, e.g.,
+//   Library/Java/JavaVirtualMachines/openjdk-21.jdk/Contents/Home.
+func findJavaHome() -> String {
+  if let home = ProcessInfo.processInfo.environment["JAVA_HOME"] {
+    return home
+  }
+
+  // This is a workaround for envs (some IDEs) which have trouble with
+  // picking up env variables during the build process
+  let path = "\(FileManager.default.homeDirectoryForCurrentUser.path()).java_home"
+  if let home = try? String(contentsOfFile: path, encoding: .utf8) {
+    if let lastChar = home.last, lastChar.isNewline {
+      return String(home.dropLast())
+    }
+
+    return home
+  }
+
+  fatalError("Please set the JAVA_HOME environment variable to point to where Java is installed.")
+}
+let javaHome = findJavaHome()
+
+let javaIncludePath = "\(javaHome)/include"
+#if os(Linux)
+  let javaPlatformIncludePath = "\(javaIncludePath)/linux"
+#elseif os(macOS)
+  let javaPlatformIncludePath = "\(javaIncludePath)/darwin"
+#elseif os(Windows)
+  let javaPlatformIncludePath = "\(javaIncludePath)/win32"
+#endif
+
+let package = Package(
+    name: "Kotlin",
+    platforms: [
+        .macOS(.v10_15)
+    ],
+    products: [
+        .library(
+            name: "Kotlin",
+            targets: ["Kotlin"]
+        ),
+        .library(
+            name: "KotlinJVM",
+            targets: ["KotlinJVM"]
+        ),
+    ],
+    dependencies: [
+        .package(
+            url: "https://github.com/PureSwift/swift-java.git",
+            branch: "feature/android-shim"
+        ),
+        .package(
+          url: "https://github.com/apple/swift-log",
+          from: "1.6.3"
+        ),
+        .package(
+            url: "https://github.com/apple/swift-system",
+            from: "1.5.0"
+        )
+    ],
+    targets: [
+        .target(
+            name: "Kotlin"
+        ),
+        .target(
+            name: "KotlinJVM",
+            dependencies: [
+                .product(
+                    name: "JavaKit",
+                    package: "swift-java"
+                ),
+                .product(
+                    name: "JavaKitCollection",
+                    package: "swift-java"
+                )
+            ],
+            exclude: ["swift-java.config"],
+            swiftSettings: [
+              .swiftLanguageMode(.v5),
+              .unsafeFlags(["-I\(javaIncludePath)", "-I\(javaPlatformIncludePath)"]),
+            ]
+        ),
+        .testTarget(
+            name: "KotlinTests",
+            dependencies: ["Kotlin"]
+        ),
+    ]
+)

Sources/Kotlin/Kotlin.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book

Sources/KotlinJVM/KotlinJVM.swift

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+//
+//  KotlinJVM.swift
+//  Kotlin
+//
+//  Created by Alsey Coleman Miller on 6/15/25.
+//
+
+import JavaKit

Tests/KotlinTests/KotlinTests.swift

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+import Testing
+@testable import Kotlin
+
+@Test func example() async throws {
+    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}