Javascript 弱者

firebase.auth.twitter.js

import firebase from 'firebase/app';
import 'firebase/auth';
import firebaseCofnig from '../config/firebase';

let _firebase;
let _provider;
export default class Auth {

  static initialize() {
    if (!_firebase) {
      _firebase = firebase.initializeApp(firebaseCofnig);
      _provider = new firebase.auth.TwitterAuthProvider();
      _provider.setCustomParameters({
        'lang': 'ja'
      });
    }

    return this;
  }

  static login() {
    return _firebase.auth().signInWithPopup(_provider)
      .then(result => {
        return result;
      }).catch(error => {
        console.log(error);
      });
  }

  static logout() {
    _firebase.auth().signOut()
      .then(result => {
        console.log('logout.');
      })
      .catch(error => {
        console.log(error);
      });
  }
}