auth-state-persistence.js

// These samples are intended for Web so this import would normally be
// done in HTML however using modules here is more convenient for
// ensuring sample correctness offline.
import firebase from "firebase/app";
import "firebase/auth";

function setPersistenceSession() {
  var email = "...";
  var password = "...";

  // [START auth_set_persistence_session]
  firebase.auth().setPersistence(firebase.auth.Auth.Persistence.SESSION)
    .then(() => {
      // Existing and future Auth states are now persisted in the current
      // session only. Closing the window would clear any existing state even
      // if a user forgets to sign out.
      // ...
      // New sign-in will be persisted with session persistence.
      return firebase.auth().signInWithEmailAndPassword(email, password);
    })
    .catch((error) => {
      // Handle Errors here.
      var errorCode = error.code;
      var errorMessage = error.message;
    });
  // [END auth_set_persistence_session]
}

function setPersistenceNone() {
  // [START auth_set_persistence_none]
  firebase.auth().setPersistence(firebase.auth.Auth.Persistence.NONE)
    .then(() => {
      var provider = new firebase.auth.GoogleAuthProvider();
      // In memory persistence will be applied to the signed in Google user
      // even though the persistence was set to 'none' and a page redirect
      // occurred.
      return firebase.auth().signInWithRedirect(provider);
    })
    .catch((error) => {
      // Handle Errors here.
      var errorCode = error.code;
      var errorMessage = error.message;
    });
  // [END auth_set_persistence_none]
}