profile.ts

import { Injectable } from '@angular/core';
import firebase from 'firebase';

@Injectable()
export class ProfileProvider {
  public userProfileRef;
  constructor() {
    this.userProfileRef = firebase.database().ref('/userProfile');
  }

  getUserProfile(): Promise<any> {
    return new Promise( (resolve, reject) => {
      this.userProfileRef.child(firebase.auth().currentUser.uid)
      .on('value', (data) => {
        resolve(data.val());
      });
    });
  }

  updateName(firstName: string, lastName: string): firebase.Promise<any> {
    return this.userProfileRef.child(firebase.auth().currentUser.uid)
    .update({
      firstName: firstName,
      lastName: lastName,
    });
  }

  updateDOB(birthDate: string): firebase.Promise<any> {
    return this.userProfileRef.child(firebase.auth().currentUser.uid)
    .update({
      birthDate: birthDate,
    });
  }

  updateEmail(newEmail: string, password: string): firebase.Promise<any> {
    const credential =  firebase.auth.EmailAuthProvider
    .credential(firebase.auth().currentUser.email, password);

    return firebase.auth().currentUser.reauthenticate(credential).then( user => {
      firebase.auth().currentUser.updateEmail(newEmail).then( user => {
        this.userProfileRef.child(firebase.auth().currentUser.uid)
          .update({ email: newEmail });
      });
    });
  }

  updatePassword(newPassword: string, oldPassword: string): firebase.Promise<any> {
    const credential =  firebase.auth.EmailAuthProvider
      .credential(firebase.auth().currentUser.email, oldPassword);

    return firebase.auth().currentUser.reauthenticate(credential).then( user => {
      firebase.auth().currentUser.updatePassword(newPassword).then( user => {
        console.log("Password Changed");
      }, error => {
        console.log(error);
      });
    });
  }
}