Authentification firebase with Angular

Hello ,
I found a problem in using auth firebase in Angular,
this is the error message :
{
"message": "Property 'auth' does not exist on type 'typeof import(\"c:/Users/Bechir/Desktop/Angular/bookshelves/node_modules/@firebase/app/dist/app-public\")'.",

it didn't work even i add the imports:
import * as firebase from '@firebase/app';
import "firebase/auth";