event-emitters/dist.es2018/EventEmitterWithCurrent.js

event emitters

import { EventEmitter } from './EventEmitter';
/**
 * This is the same as EventEmitter but:
 * Is initialized with the current message.
 * Emits the current message to each listener as soon as it subscribes.
 */
export class EventEmitterWithCurrent extends EventEmitter {
    constructor(initialMessage) {
        super();
        this.currentMessage = initialMessage;
    }
    emit(newMessage) {
        this.currentMessage = newMessage;
        super.emit(newMessage);
    }
    subscribe(listener) {
        super.subscribe(listener);
        listener(this.currentMessage);
        return listener;
    }
}
//# sourceMappingURL=EventEmitterWithCurrent.js.map