Add swiftpm definitions

Author: simolus3

.gitignore

@@ -9,6 +9,7 @@ pubspec_overrides.yaml
 .flutter-plugins-dependencies
 .flutter-plugins
 build
+.build
 
 # Shared assets
 assets/*

packages/powersync_flutter_libs/ios/powersync_flutter_libs.podspec renamed to packages/powersync_flutter_libs/darwin/powersync_flutter_libs.podspec

@@ -9,19 +9,22 @@ Pod::Spec.new do |s|
   s.description      = <<-DESC
 A new Flutter FFI plugin project.
                        DESC
-  s.homepage         = 'http://example.com'
+  s.homepage         = 'https://powersync.com'
   s.license          = { :file => '../LICENSE' }
-  s.author           = { 'Your Company' => 'email@example.com' }
+  s.author           = { 'Journey Mobile, Inc' => 'hello@powersync.com' }
 
   # This will ensure the source files in Classes/ are included in the native
   # builds of apps using this FFI plugin. Podspec does not support relative
   # paths, so Classes contains a forwarder C file that relatively imports
   # `../src/*` so that the C sources can be shared among all target platforms.
   s.source           = { :path => '.' }
-  s.source_files = 'Classes/**/*'
-  s.dependency 'Flutter'
-  s.platform = :ios, '11.0'
+  s.source_files = 'powersync_flutter_libs/Sources/powersync_flutter_libs/**/*.swift'
+  s.ios.dependency 'Flutter'
+  s.osx.dependency 'FlutterMacOS'
+  s.ios.deployment_target = '12.0'
+  s.osx.deployment_target = '10.14'
 
+  # NOTE: Always update Package.swift as well when updating this!
   s.dependency "powersync-sqlite-core", "~> 0.4.5"
 
   # Flutter.framework does not contain a i386 slice.

packages/powersync_flutter_libs/darwin/powersync_flutter_libs/Package.resolved

@@ -0,0 +1,29 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "powersync_flutter_libs",
+    platforms: [
+        .iOS("12.0"),
+        .macOS("10.14")
+    ],
+    products: [
+        .library(name: "powersync_flutter_libs", type: .static, targets: ["powersync_flutter_libs"])
+    ],
+    dependencies: [
+       .package(
+            url: "https://github.com/powersync-ja/powersync-sqlite-core-swift.git",
+            // Note: Always update podspec as well when updating this.
+            exact: "0.4.5"
+        )
+    ],
+    targets: [
+        .target(
+            name: "powersync_flutter_libs",
+            dependencies: ["PowerSyncSQLiteCore"],
+            resources: []
+        )
+    ]
+)

packages/powersync_flutter_libs/darwin/powersync_flutter_libs/Package.swift

@@ -0,0 +1,13 @@
+import Foundation
+
+#if os(iOS)
+  import Flutter
+#elseif os(macOS)
+  import FlutterMacOS
+#endif
+
+public class PowersyncFlutterLibsPlugin: NSObject, FlutterPlugin {
+  public static func register(with registrar: FlutterPluginRegistrar) {
+    // There's no native code, we just want to link the core extension
+  }
+}