fabric macos and updated example so it actually works with macos

RNCPicker.podspec

@@ -17,14 +17,14 @@ Pod::Spec.new do |s|
   s.source       = { :git => "https://github.com/react-native-picker/picker.git", :tag => "v#{s.version}" }
 
   if fabric_enabled
-    s.platforms       = { ios: '11.0', tvos: '11.0' }
-    s.source_files    = 'ios/**/*.{h,m,mm,cpp}'
+    s.platforms       = { ios: '11.0', tvos: '11.0', osx: '10.15' }
+    s.ios.source_files = 'ios/**/*.{h,m,mm,cpp}'
+    s.osx.source_files = 'macos/**/*.{h,m,mm,cpp}'
     s.requires_arc    = true
 
     install_modules_dependencies(s)
   else 
     s.ios.source_files  = "ios/**/*.{h,m,mm}"
-    s.osx.source_files  = "macos/**/*.{h,m,mm}"
   end
 
   s.dependency 'React-Core'

babel.config.js

@@ -1,14 +1,3 @@
 module.exports = {
-  presets: ['module:metro-react-native-babel-preset'],
-  plugins: [
-    [
-      'module-resolver',
-      {
-        alias: {
-          '@react-native-picker/picker': './js',
-        },
-        cwd: 'babelrc',
-      },
-    ],
-  ],
+  presets: ['module:@react-native/babel-preset'],
 };

example/macos/Podfile

@@ -6,4 +6,16 @@ require "#{ws_dir}/node_modules/react-native-test-app/macos/test_app.rb"
 
 workspace 'Example.xcworkspace'
 
-use_test_app! :hermes_enabled => true
+use_test_app! :new_arch_enabled => true, :post_install => proc { |installer|
+  installer.pods_project.targets.each do |target|
+    target.build_configurations.each do |config|
+      config.build_settings['SWIFT_ENABLE_EXPLICIT_MODULES'] = 'NO'
+    end
+  end
+  # Also set it on the main project if accessible
+  installer.generated_projects&.each do |project|
+    project.build_configurations.each do |config|
+      config.build_settings['SWIFT_ENABLE_EXPLICIT_MODULES'] = 'NO'
+    end
+  end
+}