diff --git a/knuddels-userapps-api/tsconfig.json b/knuddels-userapps-api/tsconfig.json
index b75af9824f..21fec51518 100644
--- a/knuddels-userapps-api/tsconfig.json
+++ b/knuddels-userapps-api/tsconfig.json
@@ -1,7 +1,13 @@
 {
 	"compilerOptions": {
 		"module": "commonjs",
+		"lib": [
+			"es6",
+			"dom"
+		],
 		"noImplicitAny": true,
+		"noImplicitThis": true,
+		"strictNullChecks": true,
 		"baseUrl": "../",
 		"typeRoots": [
 			"../"