kxip-app/src/app/welcome/welcome.page.ts

import { Component, OnInit } from '@angular/core';
import { Location } from '@angular/common';

@Component({
    selector: 'app-welcome',
    templateUrl: './welcome.page.html',
    styleUrls: ['./welcome.page.scss'],
})
export class WelcomePage implements OnInit {
    user: any;

    constructor(
        private location: Location
    ) { }

    ngOnInit() {
        if (localStorage.getItem('FBUser')) {
            this.user = JSON.parse(localStorage.getItem('FBUser'));
            
            setTimeout(() => {    
                this.location.back();
                
                setTimeout(() => {
                    location.reload();
                }, 200);
            }, 3000);
            
        } else {
            this.user = null;
            this.location.back();
        }
    }

}