diff --git a/extensions/css-language-features/server/src/pathCompletion.ts b/extensions/css-language-features/server/src/pathCompletion.ts
index fb7bd8df9c4..61077e2be98 100644
--- a/extensions/css-language-features/server/src/pathCompletion.ts
+++ b/extensions/css-language-features/server/src/pathCompletion.ts
@@ -201,6 +201,7 @@ function resolveWorkspaceRoot(activeDoc: TextDocument, workspaceFolders: Workspa
 			return path.resolve(URI.parse(workspaceFolders[i].uri).fsPath);
 		}
 	}
+	return undefined;
 }
 
 function shiftPosition(pos: Position, offset: number): Position {
diff --git a/extensions/css-language-features/server/src/test/completion.test.ts b/extensions/css-language-features/server/src/test/completion.test.ts
index aca18d6463b..8885cc01fc1 100644
--- a/extensions/css-language-features/server/src/test/completion.test.ts
+++ b/extensions/css-language-features/server/src/test/completion.test.ts
@@ -21,7 +21,7 @@ export interface ItemDescription {
 suite('Completions', () => {
 	const cssLanguageService = getCSSLanguageService();
 
-	let assertCompletion = function (completions: CompletionList, expected: ItemDescription, document: TextDocument, offset: number) {
+	let assertCompletion = function (completions: CompletionList, expected: ItemDescription, document: TextDocument, _offset: number) {
 		let matches = completions.items.filter(completion => {
 			return completion.label === expected.label;
 		});
diff --git a/extensions/css-language-features/server/src/utils/runner.ts b/extensions/css-language-features/server/src/utils/runner.ts
index 273194ce431..907dfe1f263 100644
--- a/extensions/css-language-features/server/src/utils/runner.ts
+++ b/extensions/css-language-features/server/src/utils/runner.ts
@@ -19,7 +19,7 @@ export function formatError(message: string, err: any): string {
 }
 
 export function runSafe<T, E>(func: () => T, errorVal: T, errorMessage: string, token: CancellationToken): Thenable<T | ResponseError<E>> {
-	return new Promise<T | ResponseError<E>>((resolve, reject) => {
+	return new Promise<T | ResponseError<E>>((resolve) => {
 		setImmediate(() => {
 			if (token.isCancellationRequested) {
 				resolve(cancelValue());
diff --git a/extensions/css-language-features/server/tsconfig.json b/extensions/css-language-features/server/tsconfig.json
index 7f8b647d04b..3203105c05c 100644
--- a/extensions/css-language-features/server/tsconfig.json
+++ b/extensions/css-language-features/server/tsconfig.json
@@ -1,13 +1,7 @@
 {
+	"extends": "../../shared.tsconfig.json",
 	"compilerOptions": {
-		"target": "es5",
-		"module": "commonjs",
-		"outDir": "./out",
-		"noUnusedLocals": true,
-		"lib": [
-			"es5", "es2015.promise"
-		],
-		"strict": true
+		"outDir": "./out"
 	},
 	"include": [
 		"src/**/*"