Angular InjectionToken

angular-injectiontoken.ts

// Injection Token
const APP_CONFIG = new InjectionToken<AppConfig>('Your description!');
const appConfig: AppConfig = { ... }

// The provider's configuration.
// At this point, whoever injects APP_CONFIG gets this object.
// But APP_CONFIG is not a class! How do we grab it?...
@NgModule({
  ...,
  providers: [{ provide: APP_CONFIG, useValue: appConfig }]
})
export class ConfigModule {}

// ...We grab it like this!
@Component({ ... })
export class MyComponent {
  constructor(@Inject(APP_CONFIG) config: AppConfig) {}
}