LeanAspNetCore.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ClientAppFolder>ClientApp\</ClientAppFolder>
  </PropertyGroup>

  <ItemGroup>
    <!-- Don't publish the SPA source files, but do show them in the project files list -->
    <Content Remove="$(ClientAppFolder)**" />
    <None Include="$(ClientAppFolder)**" Exclude="$(ClientAppFolder)node_modules\**" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="6.0.16" />
    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="6.0.16" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="6.0.13" />
  </ItemGroup>

  <Target Name="EnsureNodeModules" BeforeTargets="Build" Condition=" '$(Configuration)' == 'Debug' And !Exists('$(ClientAppFolder)\node_modules') ">
    <Message Importance="high" Text="Restoring dependencies using 'npm'. This may take several minutes..." />
    <Exec WorkingDirectory="$(ClientAppFolder)" Command="npm install" />
  </Target>
  
  <Target Name="BuildClientAssets" AfterTargets="ComputeFilesToPublish">
    <Exec WorkingDirectory="$(ClientAppFolder)" Command="npm install" />
    <Exec WorkingDirectory="$(ClientAppFolder)" Command="npm run build" />

    <!-- Include the newly-built files in the publish output -->
    <ItemGroup>
      <DistFiles Include="wwwroot\dist\**" />
      <ResolvedFileToPublish Include="@(DistFiles->'%(FullPath)')" Exclude="@(ResolvedFileToPublish)">
        <RelativePath>%(DistFiles.Identity)</RelativePath>
        <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
      </ResolvedFileToPublish>
    </ItemGroup>

  </Target>

</Project>