I'm learning node.js with firebase/firestore. For some reason only firebase.firestore() is being recognized as a function. firebase.auth(), firebase.storage() and firebase.database() are not being recognized as functions.
I'm using the basic code from one of the youtube examples:
var config = {
    apiKey: "",
    authDomain: "",
    databaseURL: "",
    projectId: "",
    storageBucket: "",
    messagingSenderId: ""
  };
  firebase.initializeApp(config);
  var firestore = firebase.firestore();
also this question appears to be in the same territory but was not helpful for me. Firebase Initializing Without Auth - firebase.auth is not a function