xamarinmac 
namespace Microsoft.AspNetCore.Razor.Language
{
    public static class DirectiveDescriptorBuilderExtensions
    {
        public static IDirectiveDescriptorBuilder AddOptionalTypeToken(this IDirectiveDescriptorBuilder builder);
    }
}
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assembly

Microsoft.AspNetCore.Razor.Language , Version=6.0.36.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNetCore.Razor.Language.

Package Microsoft.AspNetCore.Razor.Language (6.0.36) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API