diff --git a/extensions/microsoft-authentication/src/AADHelper.ts b/extensions/microsoft-authentication/src/AADHelper.ts
index 7c2daa082a3..736106853fa 100644
--- a/extensions/microsoft-authentication/src/AADHelper.ts
+++ b/extensions/microsoft-authentication/src/AADHelper.ts
@@ -17,7 +17,6 @@ import { sha256 } from './env/node/sha256';
 import { BetterTokenStorage, IDidChangeInOtherWindowEvent } from './betterSecretStorage';
 import { LoopbackAuthServer } from './authServer';
 import path = require('path');
-import { URLSearchParams } from 'url';
 
 const localize = nls.loadMessageBundle();
 
diff --git a/extensions/microsoft-authentication/tsconfig.json b/extensions/microsoft-authentication/tsconfig.json
index 6de9590bdc8..4b9d06d1847 100644
--- a/extensions/microsoft-authentication/tsconfig.json
+++ b/extensions/microsoft-authentication/tsconfig.json
@@ -11,7 +11,10 @@
 		"resolveJsonModule": true,
 		"rootDir": "src",
 		"skipLibCheck": true,
-		"sourceMap": true
+		"sourceMap": true,
+		"lib": [
+			"WebWorker"
+		]
 	},
 	"exclude": [
 		"node_modules"