diff --git a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
index 48557219d7b..2b3ffd64919 100644
--- a/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
+++ b/extensions/vscode-api-tests/src/singlefolder-tests/workspace.test.ts
@@ -349,6 +349,7 @@ suite('workspace-namespace', () => {
 				if (uri.authority === 'foo') {
 					return '1';
 				}
+				return undefined;
 			}
 		});
 		let registration2 = vscode.workspace.registerTextDocumentContentProvider('foo', {
@@ -356,6 +357,7 @@ suite('workspace-namespace', () => {
 				if (uri.authority === 'bar') {
 					return '2';
 				}
+				return undefined;
 			}
 		});
 
diff --git a/extensions/vscode-api-tests/tsconfig.json b/extensions/vscode-api-tests/tsconfig.json
index e20c62568a8..296ddb38fcb 100644
--- a/extensions/vscode-api-tests/tsconfig.json
+++ b/extensions/vscode-api-tests/tsconfig.json
@@ -1,15 +1,7 @@
 {
+	"extends": "../shared.tsconfig.json",
 	"compilerOptions": {
-		"module": "commonjs",
-		"target": "ES5",
-		"outDir": "out",
-		"lib": [
-			"es2015"
-		],
-		"sourceMap": true,
-		"strict": true,
-		"noUnusedLocals": true,
-		"noUnusedParameters": true
+		"outDir": "./out"
 	},
 	"include": [
 		"src/**/*"