From d49d4328987cc59a572db2741bc9d33d0c7690e1 Mon Sep 17 00:00:00 2001
From: Ryan Nowak <nowakra@gmail.com>
Date: Tue, 2 Jan 2018 16:55:33 -0800
Subject: [PATCH] Fix tag helper discovery in our tool

---
 src/Microsoft.AspNetCore.Razor.TagHelperTool/RunCommand.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Microsoft.AspNetCore.Razor.TagHelperTool/RunCommand.cs b/src/Microsoft.AspNetCore.Razor.TagHelperTool/RunCommand.cs
index 9c8720b073..1258a0fbb7 100644
--- a/src/Microsoft.AspNetCore.Razor.TagHelperTool/RunCommand.cs
+++ b/src/Microsoft.AspNetCore.Razor.TagHelperTool/RunCommand.cs
@@ -50,6 +50,10 @@ namespace Microsoft.AspNetCore.Razor.TagHelperTool
 
                 b.Features.Add(new DefaultMetadataReferenceFeature() { References = metadataReferences });
                 b.Features.Add(new CompilationTagHelperFeature());
+
+                // TagHelperDescriptorProviders (actually do tag helper discovery)
+                b.Features.Add(new Microsoft.CodeAnalysis.Razor.DefaultTagHelperDescriptorProvider());
+                b.Features.Add(new ViewComponentTagHelperDescriptorProvider());
             });
 
             var feature = engine.Features.OfType<ITagHelperFeature>().Single();