Don't include framework assets when NodeJS is disabled

Author: Mackinnon Buck

src/Assets/Microsoft.AspNetCore.App.Internal.Assets.csproj

@@ -21,7 +21,7 @@
     <_BlazorJSContentRoot Condition="'$(Configuration)' == 'Release'">$(RepoRoot)src\Components\Web.JS\dist\Release</_BlazorJSContentRoot>
   </PropertyGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(BuildNodeJS)' == 'true'">
     <_BlazorJSFile Include="$(_BlazorJSContentRoot)\blazor.web.js" />
     <_BlazorJSFile Include="$(_BlazorJSContentRoot)\blazor.server.js" />
     <_BlazorJSFile Include="$(_BlazorJSContentRoot)\blazor.webassembly.js" />

src/Assets/build/Microsoft.AspNetCore.App.Internal.Assets.targets

@@ -33,13 +33,22 @@
       <_FrameworkStaticWebAssetCandidate Include="$(BlazorFrameworkStaticWebAssetRoot)\blazor.webassembly.js.map" />
     </ItemGroup>
 
+    <ItemGroup>
+      <_MissingFrameworkStaticWebAssetCandidate
+        Include="@(_FrameworkStaticWebAssetCandidate)"
+        Condition="!EXISTS('%(Identity)')" />
+      <_FrameworkStaticWebAssetCandidate Remove="@(_MissingFrameworkStaticWebAssetCandidate)" />
+    </ItemGroup>
+
+    <Message Importance="High" Text="Framework asset '%(_MissingFrameworkStaticWebAssetCandidate.Identity)' could not be found and won't be included in the project." />
+
     <PropertyGroup>
       <_FrameworkAssetsPath>$(IntermediateOutputPath)frameworkassets</_FrameworkAssetsPath>
     </PropertyGroup>
 
     <MakeDir
       Directories="$(_FrameworkAssetsPath)"
-      Condition="!Exists('$(_FrameworkAssetsPath)')" />
+      Condition="!EXISTS('$(_FrameworkAssetsPath)')" />
 
     <Copy
       SourceFiles="@(_FrameworkStaticWebAssetCandidate)"