HorseStrap.csproj

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

    <PropertyGroup>
        <TargetFramework>netcoreapp2.1</TargetFramework>
        <HorseRoot></HorseRoot>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.App" />
    </ItemGroup>

    <Target Name="NpmInstall" BeforeTargets="Build" Condition=" !Exists('$(HorseRoot)node_modules') ">
        <Message Importance="high" Text="Running npm install. You'll be horsing around in no time..." />
        <Exec Command="npm install" />
    </Target>
    
    <Target Name="BuildCSS" BeforeTargets="Build">
        <Exec Command="npm run build-css" ContinueOnError="true">
            <Output TaskParameter="ConsoleOutput" PropertyName="OutputOfExec" />
            <Output TaskParameter="ExitCode" PropertyName="ErrorCode" />
        </Exec>
    </Target>

</Project>