Avalonia/build/NullableEnable.props

<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <!-- 
    The Nullable annotations on netstandard2.0 are incomplete and incorrect in places. Ignore
    nullable warnings before .NET 6 and make them errors on later target frameworks.
  -->
  <PropertyGroup>
    <Nullable>enable</Nullable>
    <WarningsAsErrors Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">$(WarningsAsErrors);nullable</WarningsAsErrors>
    <NoWarn Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">$(NoWarn);nullable</NoWarn>
  </PropertyGroup>
</Project>