[Codex] Address issue #320: Partial interfaces generate duplicate classes

Directory.Packages.props

@@ -11,6 +11,7 @@
         <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.14.0" />
         <PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.14.0" />
         <PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
+        <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
         <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.0" />
         <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.0" />
         <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
@@ -28,5 +29,7 @@
         <PackageVersion Include="Swashbuckle.AspNetCore" Version="8.1.1" />
         <PackageVersion Include="MessagePack" Version="2.5.187" />
         <PackageVersion Include="MessagePack.AspNetCoreMvcFormatter" Version="2.5.129" />
+        <PackageVersion Include="xunit" Version="2.9.2" />
+        <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
     </ItemGroup>
 </Project>

TypedSignalR.Client.TypeScript.slnx

@@ -17,5 +17,6 @@
   <Folder Name="/tests/">
     <Project Path="tests/TypedSignalR.Client.TypeScript.Tests.Server/TypedSignalR.Client.TypeScript.Tests.Server.csproj" />
     <Project Path="tests/TypedSignalR.Client.TypeScript.Tests.Shared/TypedSignalR.Client.TypeScript.Tests.Shared.csproj" />
+    <Project Path="tests/TypedSignalR.Client.TypeScript.Tests/TypedSignalR.Client.TypeScript.Tests.csproj" />
   </Folder>
 </Solution>

src/TypedSignalR.Client.TypeScript/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("TypedSignalR.Client.TypeScript.Tests")]

src/TypedSignalR.Client.TypeScript/RoslynExtensions.TypeCollector.cs

@@ -28,7 +28,9 @@ public static IReadOnlyList<INamedTypeSymbol> GetNamedTypeSymbols(this Compilati
                     .DescendantNodes()
                     .Select(x => semanticModel.GetDeclaredSymbol(x))
                     .OfType<INamedTypeSymbol>();
-            }).ToArray();
+            })
+            .Distinct<INamedTypeSymbol>(SymbolEqualityComparer.Default)
+            .ToArray();
 
         return NamedTypeSymbols;
     }
@@ -68,6 +70,7 @@ public static IReadOnlyList<INamedTypeSymbol> GetAttributeAnnotatedTypes(this Co
 
                 return attributes.Any(a => SymbolEqualityComparer.Default.Equals(a.AttributeClass, attributeSymbol));
             })
+            .Distinct<INamedTypeSymbol>(SymbolEqualityComparer.Default)
             .ToArray();
 
         return types;
@@ -100,6 +103,7 @@ public static IReadOnlyList<INamedTypeSymbol> GetAttributeAnnotatedTypes(
 
                 return false;
             })
+            .Distinct<INamedTypeSymbol>(SymbolEqualityComparer.Default)
             .ToArray();
 
         return types;

tests/TypedSignalR.Client.TypeScript.Tests/RoslynExtensionsTests.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using TypedSignalR.Client.TypeScript;
+using Xunit;
+
+namespace TypedSignalR.Client.TypeScript.Tests;
+
+public class RoslynExtensionsTests
+{
+    [Fact]
+    public void GetAttributeAnnotatedTypes_DeduplicatesPartialInterfaces()
+    {
+        const string source = """
+using System.Threading.Tasks;
+using TypedSignalR.Client;
+
+namespace TypedSignalR.Client
+{
+    public sealed class HubAttribute : Attribute { }
+}
+
+[Hub]
+public partial interface IClientHub
+{
+    Task Join(int clientId);
+}
+
+public partial interface IClientHub
+{
+    Task Leave(int clientId);
+}
+""";
+
+        var compilation = CSharpCompilation.Create(
+            "TestAssembly",
+            new[] { CSharpSyntaxTree.ParseText(source) },
+            new[]
+            {
+                MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
+                MetadataReference.CreateFromFile(typeof(Task).Assembly.Location),
+                MetadataReference.CreateFromFile(typeof(Attribute).Assembly.Location)
+            },
+            new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));
+
+        var hubAttributeSymbol = compilation.GetTypeByMetadataName("TypedSignalR.Client.HubAttribute");
+        Assert.NotNull(hubAttributeSymbol);
+
+        var annotatedTypes = compilation.GetAttributeAnnotatedTypes(hubAttributeSymbol!, includeReferencedAssemblies: false);
+
+        var clientHub = Assert.Single(annotatedTypes);
+        Assert.Equal("IClientHub", clientHub.Name);
+        Assert.Equal(2, clientHub.GetMembers().OfType<IMethodSymbol>().Count());
+    }
+}

tests/TypedSignalR.Client.TypeScript.Tests/TypedSignalR.Client.TypeScript.Tests.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" />
+        <PackageReference Include="xunit" />
+        <PackageReference Include="xunit.runner.visualstudio">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\TypedSignalR.Client.TypeScript\TypedSignalR.Client.TypeScript.csproj" />
+    </ItemGroup>
+
+</Project>