import { Injectable } from '@angular/core'; import { Subject, Observable } from 'rxjs'; @Injectable() export class SessionService { private sessionSub= new Subject(); watchSession(): Observable { return this.sessionSub.asObservable(); } getItem(key) { return sessionStorage.getItem(key); } setItem(key: string, data: any) { sessionStorage.setItem(key, data); this.sessionSub.next(sessionStorage); } removeItem(key) { sessionStorage.removeItem(key); this.sessionSub.next(sessionStorage); } }