diff --git a/src/Tools/ExternalAccess/Apex/ApexAsynchronousOperationListenerProviderAccessor.cs b/src/Tools/ExternalAccess/Apex/ApexAsynchronousOperationListenerProviderAccessor.cs
new file mode 100644
index 0000000000000000000000000000000000000000..7f34b78baf591ad1aef83d437c375b1c66b598ea
--- /dev/null
+++ b/src/Tools/ExternalAccess/Apex/ApexAsynchronousOperationListenerProviderAccessor.cs
@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System;
+using System.Composition;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.Host.Mef;
+using Microsoft.CodeAnalysis.Shared.TestHooks;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.Apex
+{
+    [Export(typeof(IApexAsynchronousOperationListenerProviderAccessor))]
+    [Shared]
+    internal sealed class ApexAsynchronousOperationListenerProviderAccessor : IApexAsynchronousOperationListenerProviderAccessor
+    {
+        private readonly AsynchronousOperationListenerProvider _implementation;
+
+        [ImportingConstructor]
+        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
+        public ApexAsynchronousOperationListenerProviderAccessor(AsynchronousOperationListenerProvider implementation)
+        {
+            _implementation = implementation;
+        }
+
+        public Task WaitAllAsync(string[] featureNames = null, Action eventProcessingAction = null)
+            => _implementation.WaitAllAsync(featureNames, eventProcessingAction);
+    }
+}
diff --git a/src/Tools/ExternalAccess/Apex/IApexAsynchronousOperationListenerProviderAccessor.cs b/src/Tools/ExternalAccess/Apex/IApexAsynchronousOperationListenerProviderAccessor.cs
new file mode 100644
index 0000000000000000000000000000000000000000..f4b0196d6a76dc034ac31dda3df97cfbf5598f86
--- /dev/null
+++ b/src/Tools/ExternalAccess/Apex/IApexAsynchronousOperationListenerProviderAccessor.cs
@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System;
+using System.Threading.Tasks;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.Apex
+{
+    internal interface IApexAsynchronousOperationListenerProviderAccessor
+    {
+        Task WaitAllAsync(string[] featureNames = null, Action eventProcessingAction = null);
+    }
+}
diff --git a/src/Tools/ExternalAccess/Apex/Microsoft.CodeAnalysis.ExternalAccess.Apex.csproj b/src/Tools/ExternalAccess/Apex/Microsoft.CodeAnalysis.ExternalAccess.Apex.csproj
index 7e026f514c6a439834ba05b996f631a915069244..fe376f49a347fe3bc5895d38232e408e61286c48 100644
--- a/src/Tools/ExternalAccess/Apex/Microsoft.CodeAnalysis.ExternalAccess.Apex.csproj
+++ b/src/Tools/ExternalAccess/Apex/Microsoft.CodeAnalysis.ExternalAccess.Apex.csproj
@@ -24,6 +24,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\..\Compilers\Core\Portable\Microsoft.CodeAnalysis.csproj" />
+    <ProjectReference Include="..\..\..\Workspaces\Core\Portable\Microsoft.CodeAnalysis.Workspaces.csproj" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Workspaces/Core/Portable/Microsoft.CodeAnalysis.Workspaces.csproj b/src/Workspaces/Core/Portable/Microsoft.CodeAnalysis.Workspaces.csproj
index 81014c875cdf528509049b27f2370320ae1b7b93..04de51d5f963384f36f621688495cb10590835c1 100644
--- a/src/Workspaces/Core/Portable/Microsoft.CodeAnalysis.Workspaces.csproj
+++ b/src/Workspaces/Core/Portable/Microsoft.CodeAnalysis.Workspaces.csproj
@@ -232,6 +232,7 @@
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.EditorFeatures" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.EditorFeatures.Text" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.EditorFeatures.Wpf" />
+    <InternalsVisibleTo Include="Microsoft.CodeAnalysis.ExternalAccess.Apex" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.ExternalAccess.Debugger" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.ExternalAccess.UnitTesting" />
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.Features" />