DemoWeb.csproj

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

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <Nullable>enable</Nullable>
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

  <Target Name="CopyFiles">
    <Exec Command="npm run build" />

    <ItemGroup>
      <!-- Because this ItemGroup is inside the target, this will enumerate
           all files just before calling Copy. If the ItemGroup were outside
           the target , it would enumerate the files during evaluation, before
           the build starts, which may miss files created during the build. -->
      <MySourceFiles Include="dist\*.*" />
      <Copy SourceFiles="@(MySourceFiles)" DestinationFiles="wwwroot\dist\%(RecursiveDir)%(Filename)%(Extension)" />
    </ItemGroup>

    <Copy SourceFiles="@(MySourceFiles)" DestinationFiles="wwwroot\dist\%(RecursiveDir)%(Filename)%(Extension)" />
  </Target>


</Project>