Thanks for adding useful information here Pawan :) One small correction . in below code block we need to update third method i.e getCartForuser to deletecartIfExists async function clearCartIfAlreadyExists ( userId: string ) : Promise < void > { const existingCart = await getCartForuser(userId); await deleteCartIfExists(userId, existingCart); } async function getCartForuser ( userId: string ): Promise < Cart > { return await getCartForuser(userId); } async function getCartForuser ( userId: string, existingCart: Cart ): Promise < Cart > { if (existingCart) { await cartService.deleteCart(userId); } }