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 on netstandard2.0 and make them errors on later target frameworks.
  -->
  <PropertyGroup>
    <Nullable>enable</Nullable>
    <WarningsAsErrors Condition="'$(TargetFramework)' != 'netstandard2.0'">$(WarningsAsErrors);nullable</WarningsAsErrors>
    <NoWarn Condition="'$(TargetFramework)' == 'netstandard2.0'">$(NoWarn);nullable</NoWarn>
  </PropertyGroup>
</Project>