Polymorphic Notification Services via Dependency Injection

import { provide, inject } from 'vue';
 
const SERVICE_KEY = Symbol('NotificationService');
 
class BaseNotifier {
  notify(message) {
    throw new Error('Method not implemented');
  }
}
 
class ToastNotifier extends BaseNotifier {
  notify(message) {
    console.log(`[TOAST UI]: ${message}`);
  }
}
 
export function provideNotifier(notifierInstance) {
  if (!(notifierInstance instanceof BaseNotifier)) {
    throw new TypeError('Invalid notifier implementation');
  }
  provide(SERVICE_KEY, notifierInstance);
}
 
export function useNotifier() {
  return inject(SERVICE_KEY, new ToastNotifier());
}