decorus-kazuma/typed-eventemitter

🎭 EventEmitter(2) decorators for the Typescript (experimental)

typed-emitter

EventEmitter is an effective function to do make an async application. And the decorator is useful to keep the code clean and simple.

日本語

EventEmitterを利用すれば、良い非同期アプリケーションを開発することができます。 また、Decoratorを利用してコードをきれいに保つことができます。なお、Decoratorを利用してコードをきれいに保つことができます。 実験的な機能です。

THIS LIBRARY IS VERY EXPERIMENTAL Might be a cause memory leak.

• Usage
• Decorators
  • @EventComponent
  • @EventListener
  • @EventEmit
  • @Event

Usage

interface Order {
  item: string;
  price: number;
}

const customEventEmitter = new EventEmitter();

import { EventListener, EventComponent, Event } from 'typed-eventemitter';

@EventComponent
class OrderService {
  lastItem: Order | undefined;

  @EventListener(customEventEmitter, 'ordered')
  receiveOrderEvent(item: Order) {
    console.log(`${item.name}: ${item.price}`);
    this.lastItem = item;
  }
}

class Application {
  static bootstrap() {
    // Singleton
    const orderService = new OrderService();
  }
}

Application.bootstrap();

customEventEmitter.on('ordered', {
  item: 'りんご',
  price: 200,
});

りんご: 200

Receive event instance

receiver(@Event event: EventEmitter, data: any): bool {
  // do something in here
  if (event instanceof EventEmitter) {
    return true; // always.
  }

  return false;
}

Emit

@EventComponent
class Test {
  @EventEmit(event, 'halo')
  sendEvent() {
    return 'Halo!';
  }

  @EventListener(event, 'halo')
  receive(data: any) {
    console.log(data);
  }
}

const testInstance = new Test();
testInstance.sendEvent();

Halo!

Decorators