Add Project Reunion C# projection project

.ado/jobs/project-reunion.yml

@@ -0,0 +1,80 @@
+parameters:
+  - name: buildEnvironment
+    type: string
+    default : PullRequest
+    values:
+     - PullRequest
+     - Continuous
+
+jobs:
+  - job: Reunion
+    displayName: Project Reunion
+    variables:
+      - template: ../variables/vs2019.yml
+    strategy:
+      matrix:
+        # ${{ if eq(parameters.buildEnvironment, 'Continuous') }}:
+        x64Release:
+          BuildConfiguration: Release
+          BuildPlatform: x64
+        # X86Debug:
+        #   BuildConfiguration: Debug
+        #   BuildPlatform: x86
+
+    pool: $(AgentPool.Medium)
+    timeoutInMinutes: 60 # how long to run the job before automatically cancelling
+    cancelTimeoutInMinutes: 5 # how much time to give 'run always even if cancelled tasks' before killing them
+
+    steps:
+      - checkout: self
+        clean: false
+        submodules: false
+
+      - template: ../templates/apply-published-version-vars.yml
+
+      - template: ../templates/build-rnw.yml
+        parameters:
+          project: vnext/Microsoft.ReactNative.ProjectReunion.sln
+          buildPlatform: $(BuildPlatform)
+          buildConfiguration: $(BuildConfiguration)
+          msbuildArguments: /p:UseWinUI3=true
+
+      - task: CopyFiles@2
+        displayName: Copy NuGet artifacts
+        inputs:
+          sourceFolder: $(Build.SourcesDirectory)/vnext/target/$(BuildPlatform)/$(BuildConfiguration)
+          targetFolder: $(Build.StagingDirectory)/reunion/$(BuildPlatform)/$(BuildConfiguration)
+          contents: |
+            Microsoft.ReactNative\**
+            Microsoft.ReactNative.ProjectReunion\**
+
+      - task: PublishBuildArtifacts@1
+        displayName: "Publish Artifact: Project Reunion"
+        inputs:
+          artifactName: ReactWindows
+          pathToPublish: $(Build.StagingDirectory)
+          parallel: true
+
+      - task: NuGetToolInstaller@0
+        inputs:
+          versionSpec: ">=5.8.0"
+
+      - template: ../templates/prep-and-pack-nuget.yml
+        parameters:
+          packDesktop: false
+          packMicrosoftReactNative: false
+          packMicrosoftReactNativeCxx: false
+          packMicrosoftReactNativeManaged: false
+          packMicrosoftReactNativeManagedCodeGen: false
+          packMicrosoftReactNativeProjectReunion: true
+          slices: '("x64.Release")'
+
+      - task: PublishBuildArtifacts@1
+        displayName: "Publish Artifact: Project Reunion NuGet"
+        inputs:
+          artifactName: ReunionNuGet
+          pathToPublish: $(Build.SourcesDirectory)/NugetRootFinal/Microsoft.ReactNative.ProjectReunion.0.0.1-pr.nupkg
+          parallel: true
+
+
+      - template: ../templates/component-governance.yml

.ado/jobs/universal.yml

@@ -102,7 +102,6 @@
 
                 - template: ../templates/component-governance.yml
 
-
             - job: UniversalTest${{ matrix.Name }}
               variables:
                 - template: ../variables/vs2019.yml

.ado/publish.yml

@@ -278,11 +278,65 @@ jobs:
           SearchPattern: vnext/target/**/*.pdb
           SymbolServerType: TeamServices
 
+  - job: RnwNativeBuildReunion
+    displayName: Build Reunion
+    dependsOn: RnwNpmPublish
+    strategy:
+      matrix:
+        X64Release:
+          BuildConfiguration: Release
+          BuildPlatform: x64
+
+    pool:
+      vmImage: $(VmImage)
+
+    steps:
+      - template: templates/apply-published-version-vars.yml
+
+      - template: templates/build-rnw.yml
+        parameters:
+          project: vnext/Microsoft.ReactNative.ProjectReunion.sln
+          buildPlatform: $(BuildPlatform)
+          buildConfiguration: $(BuildConfiguration)
+          msbuildArguments: /p:UseWinUI3=true
+
+      - task: CopyFiles@2
+        displayName: Copy NuGet artifacts
+        inputs:
+          sourceFolder: $(Build.SourcesDirectory)/vnext/target/$(BuildPlatform)/$(BuildConfiguration)
+          targetFolder: $(Build.StagingDirectory)/reunion/${(BuildPlatform)/$(BuildConfiguration)
+          contents: |
+            Microsoft.ReactNative\**
+            Microsoft.ReactNative.ProjectReunion\**
+
+      - task: PublishBuildArtifacts@1
+        displayName: "Publish Artifact: ReactWindows"
+        inputs:
+          artifactName: ReactWindows
+          pathToPublish: $(Build.StagingDirectory)
+          parallel: true
+
+      # Ensure EnableCodesign is set properly so CG fails appropriately
+      - script: |
+          echo ##vso[task.setvariable variable=EnableCodesign]true
+        displayName: Set EnableCodesign
+        condition: or(eq(variables['EnableCodesign'], 'true'), and(endsWith(variables['Build.SourceBranchName'], '-stable'), not(${{ parameters.skipStableCodesign }})))
+
+      - template: templates/component-governance.yml
+
+      # Make symbols available through http://symweb.
+      - task: PublishSymbols@2
+        displayName: Publish symbols
+        inputs:
+          SearchPattern: vnext/target/**/*.pdb
+          SymbolServerType: TeamServices
+
   - job: RNWNuget
     dependsOn:
       - RnwNpmPublish
       - RnwNativeBuildDesktop
       - RnwNativeBuildUniversal
+      - RnwNativeBuildReunion
     displayName: Sign Binaries and Publish NuGet
     pool:
       vmImage: $(VmImage)
@@ -301,6 +355,7 @@ jobs:
         parameters:
           publishCommitId: $(publishCommitId)
           npmVersion: $(npmVersion)
+          packMicrosoftReactNativeProjectReunion: true
           ${{ if or(eq(variables['EnableCodesign'], 'true'), and(endsWith(variables['Build.SourceBranchName'], '-stable'), not(parameters.skipStableCodesign))) }}: # Sign on stable release builds
             signMicrosoft: true
 

.ado/stages.yml

@@ -19,9 +19,13 @@ stages:
       - template: jobs/desktop.yml
         parameters:
           buildEnvironment: ${{ parameters.buildEnvironment }}
-  
+
       - template: jobs/nuget-desktop.yml
 
+      - template: jobs/project-reunion.yml
+        parameters:
+          buildEnvironment: ${{ parameters.buildEnvironment }}
+
       - template: jobs/cli-init.yml
         parameters:
           # The Nuget CLI verification is part of 'Build' to speed up the verification

.ado/templates/prep-and-pack-nuget.yml

@@ -11,6 +11,7 @@ parameters:
   packMicrosoftReactNativeCxx: true
   packMicrosoftReactNativeManaged: true
   packMicrosoftReactNativeManagedCodeGen: true
+  packMicrosoftReactNativeProjectReunion: false
   signMicrosoft: false
 
 steps:
@@ -20,7 +21,7 @@ steps:
       artifact: ReactWindows
       path: $(System.DefaultWorkingDirectory)/ReactWindows
 
-  - ${{ if or(eq(parameters.packMicrosoftReactNative, true), eq(parameters.packMicrosoftReactNativeCxx, true), eq(parameters.packMicrosoftReactNativeManaged, true), eq(parameters.packMicrosoftReactNativeManagedCodeGen, true)) }}:
+  - ${{ if or(eq(parameters.packMicrosoftReactNative, true), eq(parameters.packMicrosoftReactNativeCxx, true), eq(parameters.packMicrosoftReactNativeManaged, true), eq(parameters.packMicrosoftReactNativeManagedCodeGen, true))}}:
     - powershell: |
         (Get-Content -Path $(System.DefaultWorkingDirectory)\ReactWindows\Microsoft.ReactNative.VersionCheck.targets) -replace '\$\$nuGetPackageVersion\$\$', '${{parameters.npmVersion}}' | Set-Content -Path  $(System.DefaultWorkingDirectory)\ReactWindows\Microsoft.ReactNative.VersionCheck.targets
       displayName: Patch version check file with version ${{parameters.npmVersion}}
@@ -81,3 +82,14 @@ steps:
         buildProperties: CommitId=${{parameters.publishCommitId}};nugetroot=${{parameters.nugetroot}};baseconfiguration=Release;baseplatform=x64
         codesignBinaries: ${{ parameters.signMicrosoft }}
         codesignNuget: ${{ parameters.signMicrosoft }}
+
+  - ${{ if eq(parameters.packMicrosoftReactNativeProjectReunion, true) }}:
+    - template: prep-and-pack-single.yml
+      parameters:
+        packageId: Microsoft.ReactNative.ProjectReunion
+        packageVersion: ${{parameters.npmVersion}}
+        slices: ''
+        buildProperties: CommitId=${{parameters.publishCommitId}};nugetroot=${{parameters.nugetroot}};baseconfiguration=Release;baseplatform=x64
+        codesignBinaries: ${{ parameters.signMicrosoft }}
+        codesignNuget: ${{ parameters.signMicrosoft }}
+

change/react-native-windows-59917df8-86a0-4d7b-904b-b8a138b7d92d.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Create cswinrt projection nuget project",
+  "packageName": "react-native-windows",
+  "email": "asklar@microsoft.com",
+  "dependentChangeType": "patch"
+}

vnext/ExperimentalFeatures.props

@@ -0,0 +1,5 @@
+<Project>
+  <PropertyGroup Condition="'$(SolutionName)'=='Microsoft.ReactNative.ProjectReunion'">
+    <UseWinUI3>true</UseWinUI3>
+  </PropertyGroup>
+</Project>

vnext/Microsoft.ReactNative.ProjectReunion.sln

@@ -0,0 +1,148 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31410.357
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.ReactNative.ProjectReunion", "Microsoft.ReactNative.ProjectReunion\Microsoft.ReactNative.ProjectReunion.csproj", "{FB80EBB0-1E51-465D-953C-72829AE0E9EF}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Common", "Common\Common.vcxproj", "{FCA38F3C-7C73-4C47-BE4E-32F77FA8538D}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ReactNative", "ReactNative", "{9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fmt", "fmt\fmt.vcxproj", "{14B93DC8-FD93-4A6D-81CB-8BC96644501C}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Folly", "Folly\Folly.vcxproj", "{A990658C-CE31-4BCC-976F-0FC6B1AF693D}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Microsoft.ReactNative", "Microsoft.ReactNative\Microsoft.ReactNative.vcxproj", "{F7D32BD0-2749-483E-9A0D-1635EF7E3136}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ReactCommon", "ReactCommon\ReactCommon.vcxproj", "{A9D95A91-4DB7-4F72-BEB6-FE8A5C89BFBD}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Microsoft.ReactNative.Cxx", "Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems", "{DA8B35B3-DA00-4B02-BDE6-6A397B3FD46B}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Chakra", "Chakra\Chakra.vcxitems", "{C38970C0-5FBF-4D69-90D8-CBAC225AE895}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Microsoft.ReactNative.Shared", "Shared\Shared.vcxitems", "{2049DBE9-8D13-42C9-AE4B-413AE38FFFD0}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Mso", "Mso\Mso.vcxitems", "{84E05BFA-CBAF-4F0D-BFB6-4CE85742A57E}"
+EndProject
+Global
+	GlobalSection(SharedMSBuildProjectFiles) = preSolution
+		Shared\Shared.vcxitems*{2049dbe9-8d13-42c9-ae4b-413ae38fffd0}*SharedItemsImports = 9
+		Mso\Mso.vcxitems*{84e05bfa-cbaf-4f0d-bfb6-4ce85742a57e}*SharedItemsImports = 9
+		Chakra\Chakra.vcxitems*{c38970c0-5fbf-4d69-90d8-cbac225ae895}*SharedItemsImports = 9
+		Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems*{da8b35b3-da00-4b02-bde6-6a397b3fd46b}*SharedItemsImports = 9
+		Chakra\Chakra.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
+		Microsoft.ReactNative.Cxx\Microsoft.ReactNative.Cxx.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
+		Mso\Mso.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
+		Shared\Shared.vcxitems*{f7d32bd0-2749-483e-9a0d-1635ef7e3136}*SharedItemsImports = 4
+	EndGlobalSection
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|ARM64 = Debug|ARM64
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|ARM64 = Release|ARM64
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FB80EBB0-1E51-465D-953C-72829AE0E9EF}.Debug|ARM64.ActiveCfg = Debug|x64
+		{FB80EBB0-1E51-465D-953C-72829AE0E9EF}.Debug|ARM64.Build.0 = Debug|x64
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+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{FCA38F3C-7C73-4C47-BE4E-32F77FA8538D} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{14B93DC8-FD93-4A6D-81CB-8BC96644501C} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{A990658C-CE31-4BCC-976F-0FC6B1AF693D} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{F7D32BD0-2749-483E-9A0D-1635EF7E3136} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{A9D95A91-4DB7-4F72-BEB6-FE8A5C89BFBD} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{DA8B35B3-DA00-4B02-BDE6-6A397B3FD46B} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{C38970C0-5FBF-4D69-90D8-CBAC225AE895} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{2049DBE9-8D13-42C9-AE4B-413AE38FFFD0} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+		{84E05BFA-CBAF-4F0D-BFB6-4CE85742A57E} = {9BEDB5DC-8F9F-40CD-905B-C6AD6FC95CF6}
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F633EDF9-1BF7-4A0C-B5C3-53B94A024548}
+	EndGlobalSection
+EndGlobal

vnext/Microsoft.ReactNative.ProjectReunion/Directory.Build.props

@@ -0,0 +1,8 @@
+<Project>
+  <PropertyGroup>
+    <BuildOutDir>$([MSBuild]::NormalizeDirectory('$(SolutionDir)build', '$(Platform)', '$(Configuration)'))\Microsoft.ReactNative.ProjectReunion</BuildOutDir>
+    <OutDir>$([MSBuild]::NormalizeDirectory('$(BuildOutDir)', '$(MSBuildProjectName)', 'bin'))</OutDir>
+    <IntDir>$([MSBuild]::NormalizeDirectory('$(BuildOutDir)', '$(MSBuildProjectName)', 'obj'))</IntDir>
+
+  </PropertyGroup>
+</Project>