onLoginEmail(): void {
if (this.validateForm(this.email, this.password)) {
  this.authService.loginWithEmail(this.email, this.password)
    .then(() => this.router.navigate(['/home']))
    .catch(_error => {
      this.error = _error
      this.router.navigate(['/'])
    })
}

loginWithEmail(email: string, password: string) {
return this.afAuth.auth.signInWithEmailAndPassword(email, password)
  .then((user) => {
    this.authState = user
    this.isLoggedIn()
  })
  .catch(error => {
    console.log(error)
    throw error
  });

isLoggedIn() {
    this.afAuth.auth.onAuthStateChanged(auth => {
      if (auth) {
        console.log(auth);
      } else {
        console.log('User logged out');
      }
    });
  }