This project shows that with the default configuration NCrunch is not able to build projects that use Avalonia.
The reason for this is that *.axaml files are not included which results in the XamlNameReferenceGenerator not generating the InitializeComponent methods for Avalonia views.
As the code-behind (*.axaml.cs files) are included the build fails because InitializeComponent does not exist.
The workaround for this is to add Views\*.axaml to the Additional files to include setting on the project that uses Avalonia.
This demo project does not set this so that it shows the problem in action.