D-Net

import {Observable} from 'rxjs';

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

import {CanDeactivate} from '@angular/router';

export interface IDeactivateComponent {

    canExit: () => Observable<boolean> | Promise<boolean> | boolean;

}

@Injectable({

    providedIn: 'root'

})

export class CanExitGuard implements CanDeactivate<IDeactivateComponent> {

    constructor() {

    }

    canDeactivate(component: IDeactivateComponent): Observable<boolean> | Promise<boolean> | boolean {

        return component.canExit ? component.canExit() : true;

    }

}