I’m new to msbuild.

Is there a Condition key word to check if current environment is in the Visual Studio XAML Designer mode, not a actual WPF running environment? I would like to introduce some design resource library which only used for helping XAML designer work, but I don’t want to include this library in the actual project.
How can I achieve the effect I want?

Expected:

  <ItemGroup>
    <ProjectReference Condition=" '$(XamlDesignerMode)' == 'true' "
                      Include="..DesignerResourceDesignerResource.csproj" />
  </ItemGroup>

Can someone share with me the steps to achieve this?