Where do I add firebase.initializeApp() in my angular 7 project?

Im trying to deploy my angular app to firebase hosting and I get the following error in console: Uncaught FirebaseError: "projectId" not provided in firebase.initializeApp.

I have this in my app.module.ts:

export class AppModule {
constructor(private afs: AngularFirestore) {
afs.firestore.settings({
timestampsInSnapshots: true,
});
afs.firestore.enablePersistence();
firebase.initializeApp(environment.firebase);
}
}


Where exactly should I add the initializeApp command in app.module?

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