Initial commit of adding MacOS support.

Heavily inspired by flutter#5854

Author: IVLIVS-III

packages/in_app_purchase/in_app_purchase/example/pubspec.yaml

@@ -30,3 +30,11 @@ dev_dependencies:
 
 flutter:
   uses-material-design: true
+
+
+# FOR TESTING ONLY. DO NOT MERGE.
+dependency_overrides:
+  in_app_purchase:
+    path: ../../../in_app_purchase/in_app_purchase
+  in_app_purchase_storekit:
+    path: ../../../in_app_purchase/in_app_purchase_storekit

packages/in_app_purchase/in_app_purchase/pubspec.yaml

@@ -32,3 +32,9 @@ dev_dependencies:
     sdk: flutter
   plugin_platform_interface: ^2.0.0
   test: ^1.16.0
+
+
+# FOR TESTING ONLY. DO NOT MERGE.
+dependency_overrides:
+  in_app_purchase_storekit:
+    path: ../../in_app_purchase/in_app_purchase_storekit

packages/in_app_purchase/in_app_purchase_storekit/README.md

@@ -1,6 +1,6 @@
 # in\_app\_purchase\_storekit
 
-The iOS implementation of [`in_app_purchase`][1].
+The iOS and MacOS implementation of [`in_app_purchase`][1].
 
 ## Usage
 

packages/in_app_purchase/in_app_purchase_storekit/example/macos/Flutter/Flutter-Debug.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/in_app_purchase/in_app_purchase_storekit/example/macos/Flutter/Flutter-Release.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

packages/in_app_purchase/in_app_purchase_storekit/example/macos/Podfile

@@ -0,0 +1,40 @@
+platform :osx, '10.15'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_macos_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_macos_build_settings(target)
+  end
+end