diff --git a/extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts b/extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts
index fdc552a293c..40610b66f11 100644
--- a/extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts
+++ b/extensions/typescript-language-features/src/tsServer/bufferSyncSupport.ts
@@ -306,7 +306,10 @@ class GetErrRequest {
 		public readonly files: ResourceMap<void>,
 		onDone: () => void
 	) {
-		const allFiles = coalesce(Array.from(files.entries).map(entry => client.normalizedPath(entry.resource)));
+		const allFiles = coalesce(Array.from(files.entries)
+			.filter(entry => client.hasCapabilityForResource(entry.resource, ClientCapability.Semantic))
+			.map(entry => client.normalizedPath(entry.resource)));
+
 		if (!allFiles.length || !client.capabilities.has(ClientCapability.Semantic)) {
 			this._done = true;
 			setImmediate(onDone);
@@ -529,7 +532,7 @@ export default class BufferSyncSupport extends Disposable {
 		this.triggerDiagnostics();
 	}
 
-	public getErr(resources: vscode.Uri[]): any {
+	public getErr(resources: readonly vscode.Uri[]): any {
 		const handledResources = resources.filter(resource => this.handles(resource));
 		if (!handledResources.length) {
 			return;
diff --git a/extensions/typescript-language-features/src/typescriptService.ts b/extensions/typescript-language-features/src/typescriptService.ts
index 8a59d97105c..58a78ad19b5 100644
--- a/extensions/typescript-language-features/src/typescriptService.ts
+++ b/extensions/typescript-language-features/src/typescriptService.ts
@@ -145,10 +145,15 @@ export interface ITypeScriptServiceClient {
 	/**
 	 * Tries to ensure that a vscode document is open on the TS server.
 	 *
-	 * Returns the normalized path.
+	 * @return The normalized path or `undefined` if the document is not open on the server.
 	 */
 	toOpenedFilePath(document: vscode.TextDocument): string | undefined;
 
+	/**
+	 * Checks if `resource` has a given capability.
+	 */
+	hasCapabilityForResource(resource: vscode.Uri, capability: ClientCapability): boolean;
+
 	getWorkspaceRootForResource(resource: vscode.Uri): string | undefined;
 
 	readonly onTsServerStarted: vscode.Event<{ version: TypeScriptVersion, usedApiVersion: API }>;
diff --git a/extensions/typescript-language-features/src/typescriptServiceClient.ts b/extensions/typescript-language-features/src/typescriptServiceClient.ts
index a9e6bf10d7f..c068f94189b 100644
--- a/extensions/typescript-language-features/src/typescriptServiceClient.ts
+++ b/extensions/typescript-language-features/src/typescriptServiceClient.ts
@@ -673,6 +673,26 @@ export default class TypeScriptServiceClient extends Disposable implements IType
 		return this.toPath(document.uri) || undefined;
 	}
 
+	public hasCapabilityForResource(resource: vscode.Uri, capability: ClientCapability): boolean {
+		switch (capability) {
+			case ClientCapability.Semantic:
+				{
+					switch (resource.scheme) {
+						case fileSchemes.file:
+						case fileSchemes.untitled:
+							return true;
+						default:
+							return false;
+					}
+				}
+			case ClientCapability.Syntax:
+			case ClientCapability.EnhancedSyntax:
+				{
+					return true;
+				}
+		}
+	}
+
 	public toResource(filepath: string): vscode.Uri {
 		if (filepath.startsWith(this.inMemoryResourcePrefix)) {
 			const resource = vscode.Uri.parse(filepath.slice(1));
diff --git a/extensions/typescript-language-features/src/utils/fileSchemes.ts b/extensions/typescript-language-features/src/utils/fileSchemes.ts
index 46b8467879d..d465a60326e 100644
--- a/extensions/typescript-language-features/src/utils/fileSchemes.ts
+++ b/extensions/typescript-language-features/src/utils/fileSchemes.ts
@@ -6,8 +6,6 @@
 export const file = 'file';
 export const untitled = 'untitled';
 export const git = 'git';
-export const pr = 'pr';
-export const privateScheme = 'private';
 /** Live share scheme */
 export const vsls = 'vsls';
 export const walkThroughSnippet = 'walkThroughSnippet';
@@ -22,7 +20,5 @@ export const semanticSupportedSchemes = [
  */
 export const disabledSchemes = new Set([
 	git,
-	vsls,
-	privateScheme,
-	pr,
+	vsls
 ]);