Ionic basic auth decorator

Auth.ts

export function Auth(data){
    return function (target: Function) {
        Object.defineProperty(target.prototype, "ionViewCanEnter", {
            value: authFunction
        });
    };

    function authFunction(){
        //Here you can do your custom validation, it must return a boolean or a Promise
        return false;
    }
}

Page1.ts

import {Component} from '@angular/core';
import {IonicPage, NavController, NavParams} from 'ionic-angular';
import { Auth } from "../../code/Auth";

@IonicPage()
@Component({
    selector: 'page-page1',
    templateUrl: 'page1.html',
})
@Auth({})
export class Page1 {
    constructor(public navCtrl: NavController, public navParams: NavParams) {

    }
}