Disable Yarn warnings on CI builds for restore and Blazor WebAssembly projects (#22703)

Disables warnings when running the Yarn task in CI environments. You'll still get the warnings on developer builds.

Author: javiercn

eng/targets/CSharp.Common.props

@@ -56,4 +56,10 @@
 
   <Import Project="CSharp.ReferenceAssembly.props" Condition="'$(IsReferenceAssemblyProject)' == 'true'" />
 
+  <!-- Properties to control how we handle warnings when using the tasks provided by the Yarn MSBuild SDK -->
+  <PropertyGroup>
+    <IgnoreYarnWarnings>false</IgnoreYarnWarnings>
+    <IgnoreYarnWarnings Condition="'$(ContinuousIntegrationBuild)' == 'true'">true</IgnoreYarnWarnings>
+  </PropertyGroup>
+
 </Project>

eng/targets/Npm.Common.targets

@@ -42,7 +42,7 @@
   <Target Name="Restore">
     <Telemetry EventName="NETCORE_ENGINEERING_TELEMETRY" EventData="Category=Restore" />
     <Message Importance="High" Text="Running yarn install on $(MSBuildProjectFullPath)" />
-    <Yarn Command="install --mutex network $(InstallArgs)" StandardOutputImportance="High" StandardErrorImportance="High" />
+    <Yarn Command="install --mutex network $(InstallArgs)" StandardOutputImportance="High" StandardErrorImportance="High" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
   </Target>
 
   <Target Name="PrepareForBuild">

src/Components/WebAssembly/Authentication.Msal/src/Microsoft.Authentication.WebAssembly.Msal.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Razor">
+<Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <Sdk Name="Yarn.MSBuild" />
 
@@ -58,9 +58,9 @@
   </Target>
 
   <Target Name="CompileInterop" Condition="'$(BuildNodeJS)' != 'false' AND '$(DesignTimeBuild)' != 'true'" Inputs="$(InteropCompilationCacheFile)" Outputs="@(YarnOutputs)">
-    <Yarn Command="install --mutex network" WorkingDirectory="$(YarnWorkingDir)" />
-    <Yarn Command="run build:release" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Release'" />
-    <Yarn Command="run build:debug" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Debug'" />
+    <Yarn Command="install --mutex network" WorkingDirectory="$(YarnWorkingDir)" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
+    <Yarn Command="run build:release" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Release'" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
+    <Yarn Command="run build:debug" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Debug'" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
 
     <ItemGroup>
       <_InteropBuildOutput Include="$(YarnWorkingDir)dist\$(Configuration)\**" Exclude="$(YarnWorkingDir)dist\.gitignore" />

src/Components/WebAssembly/WebAssembly.Authentication/src/Microsoft.AspNetCore.Components.WebAssembly.Authentication.csproj

@@ -59,9 +59,9 @@
   </Target>
 
   <Target Name="CompileInterop" Condition="'$(BuildNodeJS)' != 'false' AND '$(DesignTimeBuild)' != 'true'" Inputs="$(InteropCompilationCacheFile)" Outputs="@(YarnOutputs)">
-    <Yarn Command="install --mutex network" WorkingDirectory="$(YarnWorkingDir)" />
-    <Yarn Command="run build:release" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Release'" />
-    <Yarn Command="run build:debug" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Debug'" />
+    <Yarn Command="install --mutex network" WorkingDirectory="$(YarnWorkingDir)" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
+    <Yarn Command="run build:release" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Release'" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
+    <Yarn Command="run build:debug" WorkingDirectory="$(YarnWorkingDir)" Condition="'$(Configuration)' == 'Debug'" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
 
     <ItemGroup>
       <_InteropBuildOutput Include="$(YarnWorkingDir)dist\$(Configuration)\**" Exclude="$(YarnWorkingDir)dist\.gitignore" />

src/Middleware/NodeServices/src/Microsoft.AspNetCore.NodeServices.csproj

@@ -21,7 +21,7 @@
 
   <Target Name="YarnInstall">
     <Message Text="Running yarn install on $(MSBuildProjectFile)" Importance="High" />
-    <Yarn Command="install --mutex network" />
+    <Yarn Command="install --mutex network" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)" />
   </Target>
 
   <Target Name="PrepublishScript" DependsOnTargets="YarnInstall" BeforeTargets="PrepareForPublish" Condition=" '$(IsCrossTargetingBuild)' != 'true' ">

src/Shared/E2ETesting/E2ETesting.targets

@@ -20,7 +20,7 @@
       Importance="High"
       Text="Prerequisites were not enforced at build time. Running Yarn or the E2E tests might fail as a result. Check /src/Shared/E2ETesting/Readme.md for instructions." />
 
-    <Yarn Command="install --mutex network" Condition="'$(EnforceE2ETestPrerequisites)' == 'true'"/>
+    <Yarn Command="install --mutex network" Condition="'$(EnforceE2ETestPrerequisites)' == 'true'" IgnoreStandardErrorWarningFormat="$(IgnoreYarnWarnings)"/>
   </Target>
 
   <Target