CASL in Angular app

app.module.js

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AbilityModule } from '@casl/angular';
import { Ability } from '@casl/ability';

import { defineAbilitiesFor, createAbility } from '../services/ability';
import { AppRoutingModule } from './routing.module';

@NgModule({
  declarations: [
    ...
  ],
  imports: [
    ...,
    BrowserModule,
    AppRoutingModule,
    AbilityModule.forRoot(),
  ],
  providers: [
    { provide: Ability, useFactory: createAbility }
  ],
  bootstrap: [App]
})
export class AppModule { }