login(credentials) {
      var that = this
      return new Observable(observer => {
        return firebase.auth().signInWithEmailAndPassword(credentials.email, credentials.password)
          .then(function (authData) {
              console.log("Authenticated successfully with payload-", authData);
              observer.next(authData)
          }).catch(function (_error) {
              console.log("Login Failed!", _error);
              observer.error(_error)
          })
      });
    }

login(credentials): Promise<any> {
    return new Promise((resolve: () => void, reject: (reason: Error) => void) => {
      firebase.auth().authWithPassword({"email": credentials.email, "password": credentials.password}, (error: Error) => {
        if (error) {
          console.error('ERROR @ signInWithEmailPassword :', error);
          reject(error);
        }
        else {
          //console.log("Authenticated successfully:", this.authData);
          resolve();
        }
      });
    });
  }