[0.84] Upgrades including Visual Studio 2026 (#16232)

* Upgrade to PowerShell 7 (#16075)

* Ran NuGetRestoreForceEvaluateAllSolutions.ps1

* Define installNuGetPackages task; Install pwsh 7.6.1

* Replace powershell.exe with pwsh.exe

* Change files

* CI: Ensure NuGet is availabe before `yarn install`

* Add NuGetAuthenticate before yarn install

* Do not download PowerShell on CI/CD environments

* Fix just-task JS syntax

* Add dotnet-tools manifest

* Fix pwsh.exe tool path

* Resolve dotnet-tools.json path

* Use dotnet for `nuget locals`

* Use PWSH in nuget-restore-task.js

* Break dependency loop in just-task

* Update other ADO tasks

* Update @react-native-windows/automation

* Rename findPwsh as findPowerShell

* Drop powershell export from commandWithProgress

* Change files

* Add README for find-dotnet-tools

* Add README to package.json

* Adjust newline

* Run task `installDotnetTools` only when not in CI

* Install .NET tools in CI

* Install .NET on prepare-js-env

* Do not install .NET tools on CI

* Quote powershell path

* fix yarn lint

* Ran NuGetRestoreForceEvaluateAllSolutions.ps1

* Restore deleted lock files

* Add missing dependency

* Use -Command for compatible PWSH calls

* Use -Command pwsh argument

* Correct runPowerShellScriptFunction cmd escaping

* Quote pwsh command in runPowerShellScriptFunction

* Remove quotes

* Quote remaining findPowerShell() calls for execSync

* Add temporary diagnostic commands

* Diagnostics

* Diagnostics

* Diagnostics

* Add runPowerShellScriptFunction argument to delegate Appx-related commands to Windows PowerShell

* Remove diagnostics steps

* Use execFileSync instead of execSync in deploy.ts

* Remove querystrings from FS paths

* Suppress warning when using `-UseWindowsPowerShell`

* Revert "Remove querystrings from FS paths"

This reverts commit e1f3cfd.

* Use pipe semantics for Get-AppxPackage in resolveAppName

* Hard-fail if PowerShell 7 cannot be found.

Do not fall back to Windows PowerShell (powershell.exe).
PowerShell code may not be backwards compatible.

* Improve missing pwsh.exe error message

* Add package resolution pipeline test

* UseWindowsPowerShell for package resolution test

* Try to read package Microsoft.PrintDialog

* Replace stderr redirection with -WarningAction

* Replace stderr redirection with -WarningAction

* Print sample app names on appWindow error

* Add more diagnostics

* Add missing -WarningAction SilentlyContinue

* Revert "Add more diagnostics"

This reverts commit 8c10bc4.

* Revert "Print sample app names on appWindow error"

This reverts commit 6e70148.

* Remove CI probing tasks

* Revert "Use pipe semantics for Get-AppxPackage in resolveAppName"

This reverts commit 6c46c73.

Co-authored-by: Copilot <copilot@github.com>

* Remove unused escaping logic

* Re-introduce deleted .lock.json

---------

Co-authored-by: Copilot <copilot@github.com>

* Fix PowerShell installation (#16164)

* Defer findPowershell to layoutMSRNCxx

* Change files

* Upgrade to Visual Studio 2026 (#16170)

* Update deps script. TODO: test

* Upgrade rnw-deps to .NET 10

* Defer findPowershell to layoutMSRNCxx

* Upgrade VS version to 18.6.1

* Drop /async in MSVC 14.5

* Replace std::future coroutines with WinRT types

* clang format

* Change files

* Drop Windows10SDK.19041

* Change files

* Set TargetFramework to net10.0-windows10.0.26100.0

* Use IAsyncOperation instead of out parameters

* Install .NET 10

* Revert "Install .NET 10"

This reverts commit 5f75dc0.

* Revert "Set TargetFramework to net10.0-windows10.0.26100.0"

This reverts commit 22a4791.

* clang format

* Upgrade CsWinRT.csproj to .NET 8

* Fix filters

* Upgrade MSRN SLN to VS 18

* Revert parameter signature in LoadBundleAsync

* Update CSWinRT lock

* Allow all versions of VS 2026

* Use IBuffer instead of hstring as payload

GetJavaScriptFromServerAsync retuns bundle contents as hstring (16 bit)
It then gets converted to an 8-bit string. This conversion drops
bytes consideres "invalid". Those bytes are expected as part of the Hermes bundle header.

Transmitting the bundle as an IBuffer preserves the original bytes and avoids the conversion issues.

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Use WinRT exception types instead of std

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Upgrade to GoogleTest Adapter 1.8.1.8 (#16218)

* Upgrade to GoogleTest adapter 1.8.1.8

* Change files

* Update package lock files

* Upgrade CI agents to Windows Server 2025 (#16208)

* Use image rnw-img-vs2026-node24

* Update fork-sync/bin.js chmod

* Upgrade to MSVC 14.5

* Drop -UseWindowsPowerShell fallback

* Manually install yarn

* Upgrade to .NET Hosting Bundle 10.0.8

* Change files

* Fix change file

* Add temp npm install yarn in templates

* Test yarn location

* update

* update

* TEMPORARILY revert agent image

* Print yarn version in setup

* Revert "TEMPORARILY revert agent image"

This reverts commit 7c175e1.

* update

* update

* update

* Upgrade to msbuildVersion: 18.0

* Update Google test adapter location

* Remove unused statement

* Remove probing tasks

* Upgrade to VSTest@3

* Upgrade more projects and scripts to VS 2026

* Explicitly set vstest.console location

* Install midgard-yarn and verdaccio in-place

* Fix yarn version

* Update node-tests version

* Use pwsh in Add-AppDevPackage

* Make WindowsStoreAppUtils use PowerShell 7

* Update snapshot values

* Update snapshot from failing x86 run

* Use the --tag argument for verdaccio under Node 24

* Ignore/warn on unstable click test

* Enable WMIC for RN Doctor

* Disable RN doctor until it drops WMIC

* Add rnw-img-vs2026-node24.json (#16224)

* Update CI verdaccio to 6.7.2 (#16223)

* Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 (#16225)

* Upgrade to Microsoft.WindowsAppSDK 1.8.260508005

* Change files

* fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages (#16173)

* blob support (#8)

* blob support

* pr comments

* pr comments

* Update DefaultBlobResource.cpp

* Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json

* Add WebSocketArrayBuffer headless test (#9)

* Add WebSocketArrayBuffer headless test

* Skip test by default

* pr comments

* Update overrides (#10)

---------

Co-authored-by: Julio César Rocha <JunielKatarn@users.noreply.github.com>

* Upgrade projects to .NET 10 (#16226)

* Upgrade projects to .NET 10

* Upgrade lock files

* Change files

* Fix missing conflicts

* Update packages lock

* Remove extra yarn step

* Re-introduce JS Desktop integration tests (#16228)

* Remove redundant condition Desktop.IntegrationTests.SkipRNTester

Modify Desktop.IntegrationTests.Filter instead.

* Re-introduce WebSocket and WebSocketBlob tests

* Make WSBlob test compare contents

* Rename method to RunTest

* Handle initial message from default endpoint

* Change files

* Migrate XHR test

* Port Fetch test

* Port Blob test

* WebSocketMultipleSendTest

* Remove JS WebSocket servers

* Skip in CI for now

* Remove ban-types

* Fix DynamicReaderWriterTests

* Use WinRT coroutine types for UwpScriptStore

* clang format

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Gordon MacMaster <31481849+gmacmaster@users.noreply.github.com>

Author: 4 people

.ado/build-template.yml

@@ -20,10 +20,10 @@ parameters:
   default:
     Medium:
       name: rnw-pool-4-microsoft
-      demands: ImageOverride -equals rnw-img-vs2022-node22
+      demands: ImageOverride -equals rnw-img-vs2026-node24
     Large:
       name: rnw-pool-8-microsoft
-      demands: ImageOverride -equals rnw-img-vs2022-node22
+      demands: ImageOverride -equals rnw-img-vs2026-node24
 
 - name: desktopBuildMatrix
   type: object
@@ -161,6 +161,13 @@ extends:
               version: '24.x'
             displayName: Use Node.js 24.x
 
+          # TODO: REMOVE. Should be included in image.
+          - task: CmdLine@2
+            inputs:
+              script: |
+                npm install --global yarn@1.22.22 midgard-yarn@1.23.34 verdaccio@6.7.2
+            displayName: Install Node base packages
+
           - template: .ado/templates/compute-beachball-branch-name.yml@self
 
           # 4. Beachball tooling (developer builds only)
@@ -274,6 +281,7 @@ extends:
               #12714 - Disable for first deployment of test website.
               - name: Desktop.IntegrationTests.Filter
                 value: >
+                  (FullyQualifiedName!~Microsoft::React::Test::RNTesterHeadlessTests)&
                   (FullyQualifiedName!=Microsoft::React::Test::WebSocketIntegrationTest::ConnectClose)&
                   (FullyQualifiedName!=Microsoft::React::Test::WebSocketIntegrationTest::ConnectNoClose)&
                   (FullyQualifiedName!=Microsoft::React::Test::WebSocketIntegrationTest::SendReceiveClose)&

.ado/image/rnw-img-vs2026-node24.json

@@ -0,0 +1,66 @@
+{
+    "artifacts": [
+        {
+            "name": "windows-EnableDeveloperMode"
+        },
+        {
+            "name": "windows-enable-long-paths"
+        },
+        {
+            "name": "Windows-ServerAddFeature",
+            "parameters": {
+                "FeatureName": "Web-Server"
+            }
+        },
+        {
+            "name": "Windows-ServerAddFeature",
+            "parameters": {
+                "FeatureName": "Web-Scripting-Tools"
+            }
+        },
+        {
+            "name": "windows-gitinstall"
+        },
+        {
+            "name": "windows-AzPipeline-ImageHelpers"
+        },
+        {
+            "name": "windows-AzPipeline-InitializeVM"
+        },
+        {
+            "name": "windows-AzPipeline-powershellCore"
+        },
+        {
+            "name": "windows-AzPipeline-7zip"
+        },
+        {
+            "name": "windows-visualstudio-bootstrapper",
+            "parameters": {
+                "Workloads": "--add Microsoft.VisualStudio.Workload.ManagedDesktop --add Microsoft.VisualStudio.Workload.NativeDesktop --add Microsoft.VisualStudio.Workload.Universal --add Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Core --add Microsoft.VisualStudio.ComponentGroup.UWP.Support --add Microsoft.VisualStudio.ComponentGroup.UWP.VC --add Microsoft.Component.MSBuild --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 --add Microsoft.VisualStudio.Component.Windows11SDK.22621 --includeRecommended --includeOptional",
+                "SKU": "Enterprise",
+                "VSBootstrapperURL": "https://aka.ms/vs/18/stable/vs_Enterprise.exe"
+            }
+        },
+        {
+            "name": "Windows-NodeJS",
+            "parameters": {
+                "Version": "24.16.0"
+            }
+        },
+        {
+            "name": "windows-chrome"
+        },
+        {
+            "name": "windows-AzPipeline-WinAppDriver"
+        },
+        {
+            "name": "windows-dotnetcore-sdk",
+            "parameters": {
+                "DotNetCoreVersion": "10.0.300"
+            }
+        },
+        {
+            "name": "Windows-AzureCLI"
+        }
+    ]
+}

.ado/jobs/desktop-single.yml

@@ -24,35 +24,24 @@ steps:
   - template: ../templates/checkout-shallow.yml
 
   # Set up IIS for integration tests
-  - pwsh: |
-      Install-WindowsFeature -Name Web-Server, Web-Scripting-Tools
-    displayName: Install IIS
-
   - pwsh: |
       $DownloadScript = "$(Build.SourcesDirectory)\vnext\Scripts\Tfs\Invoke-WebRequestWithRetry.ps1"
 
       & $DownloadScript `
-        -Uri 'https://download.visualstudio.microsoft.com/download/pr/20598243-c38f-4538-b2aa-af33bc232f80/ea9b2ca232f59a6fdc84b7a31da88464/dotnet-hosting-8.0.3-win.exe' `
-        -OutFile dotnet-hosting-8.0.3-win.exe
+        -Uri 'https://builds.dotnet.microsoft.com/dotnet/aspnetcore/Runtime/10.0.8/dotnet-hosting-10.0.8-win.exe' `
+        -OutFile dotnet-hosting-10.0.8-win.exe
 
       Write-Host 'Installing .NET hosting bundle'
-      Start-Process -Wait -FilePath .\dotnet-hosting-8.0.3-win.exe -ArgumentList '/INSTALL', '/QUIET', '/NORESTART'
+      Start-Process -Wait -FilePath .\dotnet-hosting-10.0.8-win.exe -ArgumentList '/INSTALL', '/QUIET', '/NORESTART'
       Write-Host 'Installed .NET hosting bundle'
-
-      & $DownloadScript `
-        -Uri 'https://download.visualstudio.microsoft.com/download/pr/f2ec926e-0d98-4a8b-8c70-722ccc2ca0e5/b59941b0c60f16421679baafdb7e9338/dotnet-sdk-7.0.407-win-x64.exe' `
-        -OutFile dotnet-sdk-7.0.407-win-x64.exe
-
-      Write-Host 'Installing .NET 7 SDK'
-      Start-Process -Wait -FilePath .\dotnet-sdk-7.0.407-win-x64.exe -ArgumentList '/INSTALL', '/QUIET', '/NORESTART'
-      Write-Host 'Installed .NET 7 SDK'
     displayName: Install the .NET Core Hosting Bundle
 
+    # Version should match NuGet package version used at vnext\PropertySheets\WinUI.props: WinUI3Version
   - pwsh: |
       $DownloadScript = "$(Build.SourcesDirectory)\vnext\Scripts\Tfs\Invoke-WebRequestWithRetry.ps1"
 
       & $DownloadScript `
-        -Uri 'https://aka.ms/windowsappsdk/1.8/latest/windowsappruntimeinstall-x64.exe' `
+        -Uri 'https://aka.ms/windowsappsdk/1.8/1.8.260508005/windowsappruntimeinstall-x64.exe' `
         -OutFile windowsappruntimeinstall-x64.exe
 
       Write-Host 'Installing Windows App SDK Runtime'
@@ -70,12 +59,6 @@ steps:
 
   - template: ../templates/apply-published-version-vars.yml
 
-  - ${{ if eq(variables['Desktop.IntegrationTests.SkipRNTester'], true) }}:
-    - pwsh: |
-        $newValue = '(FullyQualifiedName!~Microsoft::React::Test::RNTesterHeadlessTests::)&' + "$(Desktop.IntegrationTests.Filter)"
-        Write-Host "##vso[task.setvariable variable=Desktop.IntegrationTests.Filter]$newValue"
-      displayName: Update Desktop.IntegrationTests.Filter to exclude RNTester integration tests
-
   - template: ../templates/msbuild-sln.yml
     parameters:
       solutionDir: vnext
@@ -97,7 +80,7 @@ steps:
   - template: ../templates/discover-google-test-adapter.yml
 
   - ${{ if ne(parameters.buildPlatform, 'ARM64EC') }}:
-    - task: VSTest@2
+    - task: VSTest@3
       displayName: Run Desktop Unit Tests
       timeoutInMinutes: 5 # Set smaller timeout, due to hangs
       inputs:
@@ -115,6 +98,7 @@ steps:
         publishRunAttachments: true
         collectDumpOn: onAbortOnly
         vsTestVersion: latest
+        vstestLocation: C:\Program Files\Microsoft Visual Studio\18\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe
         failOnMinTestsNotRun: true
 
     # Suspected debug assert in TestRunner hanging tests randomly. Run only on Release for now.
@@ -211,7 +195,7 @@ steps:
           Invoke-WebRequest -UseBasicParsing -Uri "http://localhost:8081/IntegrationTests/IntegrationTestsApp.bundle?platform=windows&dev=true"
       continueOnError: true
 
-    - task: VSTest@2
+    - task: VSTest@3
       displayName: Run Desktop Integration Tests
       inputs:
         testSelector: testAssemblies
@@ -224,6 +208,7 @@ steps:
         publishRunAttachments: true
         collectDumpOn: onAbortOnly
         vsTestVersion: latest
+        vstestLocation: C:\Program Files\Microsoft Visual Studio\18\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe
         failOnMinTestsNotRun: true
         otherConsoleOptions: '/blame -- RunConfiguration.TestSessionTimeout=300000'
 

.ado/jobs/e2e-test.yml

@@ -320,6 +320,21 @@ jobs:
               condition: and(failed(), eq(variables.StartedFabricTests, 'true'))
               continueOnError: true
 
+            - pwsh: |
+                if (Test-Path "packages/e2e-test-app-fabric/test/__image_snapshots__/__diff_output__") {
+                  Write-Host "##vso[task.setvariable variable=DiffOutputExists]true"
+                }
+              displayName: Check for image diff output folder
+              condition: failed()
+
+            - task: CopyFiles@2
+              displayName: Copy Fabric image diffs
+              inputs:
+                sourceFolder: packages/e2e-test-app-fabric/test/__image_snapshots__/__diff_output__
+                targetFolder: $(Build.StagingDirectory)/snapshots-image-diffs
+                contents: "**"
+              condition: and(failed(), eq(variables.DiffOutputExists, 'true'))
+
             - script: npx jest --clearCache
               displayName: clear jest cache
               workingDirectory: packages/e2e-test-app-fabric

.ado/jobs/node-tests.yml

@@ -11,7 +11,7 @@ parameters:
 
   - name: versions
     type: object
-    default: [22]
+    default: [24]
 
 jobs:
   - ${{ each nodeVersion in parameters.versions }}:

.ado/jobs/universal-single.yml

@@ -50,7 +50,7 @@ steps:
   # --- Tests (run against the just-built binaries, no download/restore needed) ---
   - template: ../templates/discover-google-test-adapter.yml
 
-  - task: VSTest@2
+  - task: VSTest@3
     displayName: Run Universal Unit Tests (Native)
     timeoutInMinutes: 5 # Set smaller timeout, due to hangs
     inputs:
@@ -67,5 +67,6 @@ steps:
       publishRunAttachments: true
       collectDumpOn: onAbortOnly
       vsTestVersion: latest
+      vstestLocation: C:\Program Files\Microsoft Visual Studio\18\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.console.exe
       failOnMinTestsNotRun: true
     condition: and(succeeded(), not(eq('${{ parameters.buildPlatform }}', 'ARM64')))

.ado/pr-pipeline.yml

@@ -22,7 +22,7 @@ extends:
     AgentPool:
       Medium:
         name: rnw-pool-4
-        demands: ImageOverride -equals rnw-img-vs2022-node22
+        demands: ImageOverride -equals rnw-img-vs2026-node24
       Large:
         name: rnw-pool-8
-        demands: ImageOverride -equals rnw-img-vs2022-node22
+        demands: ImageOverride -equals rnw-img-vs2026-node24

.ado/scripts/build.js

@@ -101,7 +101,7 @@ function ensureNuGet(toolsPath) {
   ensureDir(toolsPath);
   console.log(`Downloading nuget.exe to: ${localNuGet}`);
   execSync(
-    `powershell.exe -NoLogo -NoProfile -Command ` +
+    `pwsh.exe -NoLogo -NoProfile -Command ` +
       `"[Net.ServicePointManager]::SecurityProtocol = ` +
       `[Net.SecurityProtocolType]::Tls12; ` +
       `Invoke-WebRequest -Uri 'https://dist.nuget.org/win-x86-commandline/latest/nuget.exe' ` +

.ado/templates/discover-google-test-adapter.yml

@@ -1,12 +1,14 @@
 steps:
 
   - pwsh: |
-      $vsExtensionPath="${env:ProgramFiles}\Microsoft Visual Studio\2022\Enterprise\Common7\IDE\Extensions\";
-      $GoogleTestAdapterPath=(Get-ChildItem $vsExtensionPath -Directory | Where-Object -FilterScript {Test-Path  (Join-Path -Path $_.FullName -ChildPath "GoogleTestAdapter.Core.dll")}).FullName
+      $extensionsPath = "${env:ProgramFiles}\Microsoft Visual Studio\18\Enterprise\Common7\IDE\Extensions"
+      $adapterPath = Get-ChildItem $extensionsPath -Directory |`
+        Where-Object -FilterScript { Test-Path (Join-Path -Path $_.FullName -ChildPath "GoogleTestAdapter.Core.dll") } |`
+        Select-Object -ExpandProperty FullName
 
       # Test the path to the google test adapter
-      Test-Path -Path $GoogleTestAdapterPath
+      Test-Path -Path $adapterPath
 
-      Write-Debug "Setting Google Test Adapter Path to '$GoogleTestAdapterPath' found in '$vsExtensionPath'"
-      Write-Host "##vso[task.setvariable variable=GoogleTestAdapterPath]$GoogleTestAdapterPath"
+      Write-Debug "Setting Google Test Adapter Path to '$adapterPath' found in '$extensionsPath'"
+      Write-Host "##vso[task.setvariable variable=GoogleTestAdapterPath]$adapterPath"
     displayName: Set GoogleTestAdapterPath

.ado/templates/install-SDK.yml

@@ -7,5 +7,6 @@ steps:
       targetType: filePath
       filePath: vnext\Scripts\Install-WindowsSdkISO.ps1
       arguments: ${{ parameters.sdkVersion }}
+      pwsh: true
     displayName: 'Install Insider SDK (${{ parameters.sdkVersion }})'
     condition: ne('', '${{ parameters.sdkVersion }}')