A property named visible should be passed to NavItemsService optionally to show/hide the item

[mehmet-erim]

NavItem interface will be updated as shown below:

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

export interface NavItem {
  id: string | number;
  component?: Type<any>;
  html?: string;
  action?: () => void;
  order?: number;
  requiredPolicy?: string;
+  visible?: () => boolean;
}

If you don't pass the visible property, it will be set as () => true.