change app.module.ts for angularfire2

import { AngularFireModule } from 'angularfire2';
import { firebaseConfig } from '../environment';
import { AngularFireDatabaseModule } from 'angularfire2/database';
import { AngularFireAuthModule } from 'angularfire2/auth';



// imports: [　の中に、以下を挿入。（一行前の最後にカンマも挿入）

    AngularFireModule.initializeApp(firebaseConfig), // imports firebase/app needed for everything
    AngularFireDatabaseModule, // imports firebase/database, only needed for database features
    AngularFireAuthModule, // imports firebase/auth, only needed for auth features
    
 

// src/environment.ts を新たに作成し、以下のように記載
export const firebaseConfig = {
    apiKey: "<firebaseの自分のapiKey>",
    authDomain: "<firebaseの自分の......>",
    databaseURL: "<firebaseの自分の......>",
    projectId: "<firebaseの自分の......>",
    storageBucket: "<firebaseの自分の......>",
    messagingSenderId: "<firebaseの自分の......>"
  }