Fix

src/EditorFeatures/Core/Implementation/Diagnostics/AbstractDiagnosticsTaggerProvider.cs

@@ -173,7 +173,7 @@ private async Task ProduceTagsAsync(
             try
             {
                 var diagnosticMode = GlobalOptions.GetDiagnosticMode(InternalDiagnosticsOptions.NormalDiagnosticMode);
-                
+
                 var id = bucket.Id;
                 var diagnostics = await _diagnosticService.GetPushDiagnosticsAsync(
                     workspace, document.Project.Id, document.Id, id,

src/Features/Core/Portable/ExternalAccess/VSTypeScript/Api/IVSTypeScriptDiagnosticService.cs

@@ -0,0 +1,15 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Immutable;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.VSTypeScript.Api
+{
+    internal interface IVSTypeScriptDiagnosticService
+    {
+        Task<ImmutableArray<VSTypeScriptDiagnosticData>> GetPushDiagnosticsAsync(Workspace workspace, ProjectId projectId, DocumentId documentId, object id, bool includeSuppressedDiagnostics, CancellationToken cancellationToken);
+    }
+}

src/Features/Core/Portable/ExternalAccess/VSTypeScript/Api/VSTypeScriptDiagnosticData.cs

@@ -0,0 +1,35 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Text;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.VSTypeScript.Api
+{
+    internal readonly struct VSTypeScriptDiagnosticData
+    {
+        private readonly DiagnosticData _data;
+
+        internal VSTypeScriptDiagnosticData(DiagnosticData data)
+        {
+            _data = data;
+        }
+
+        public DiagnosticSeverity Severity
+            => _data.Severity;
+
+        public string? Message
+            => _data.Message;
+
+        public string Id
+            => _data.Id;
+
+        public ImmutableArray<string> CustomTags
+            => _data.CustomTags;
+
+        public LinePositionSpan GetLinePositionSpan(SourceText sourceText, bool useMapped)
+            => DiagnosticData.GetLinePositionSpan(_data.DataLocation, sourceText, useMapped);
+    }
+}

src/Features/Core/Portable/ExternalAccess/VSTypeScript/VSTypeScriptDiagnosticService.cs

@@ -0,0 +1,37 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Composition;
+using System.Collections.Immutable;
+using Microsoft.CodeAnalysis.Host.Mef;
+using Microsoft.CodeAnalysis.ExternalAccess.VSTypeScript.Api;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Options;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.VSTypeScript
+{
+    [Export(typeof(IVSTypeScriptDiagnosticService)), Shared]
+    internal sealed class VSTypeScriptDiagnosticService : IVSTypeScriptDiagnosticService
+    {
+        private readonly IDiagnosticService _service;
+        private readonly IGlobalOptionService _globalOptions;
+
+        [ImportingConstructor]
+        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
+        public VSTypeScriptDiagnosticService(IDiagnosticService service, IGlobalOptionService globalOptions)
+        {
+            _service = service;
+            _globalOptions = globalOptions;
+        }
+
+        public async Task<ImmutableArray<VSTypeScriptDiagnosticData>> GetPushDiagnosticsAsync(Workspace workspace, ProjectId projectId, DocumentId documentId, object id, bool includeSuppressedDiagnostics, CancellationToken cancellationToken)
+        {
+            var result = await _service.GetPushDiagnosticsAsync(workspace, projectId, documentId, id, includeSuppressedDiagnostics, _globalOptions.GetDiagnosticMode(InternalDiagnosticsOptions.NormalDiagnosticMode), cancellationToken).ConfigureAwait(false);
+            return result.SelectAsArray(data => new VSTypeScriptDiagnosticData(data));
+        }
+    }
+}