event-emitters/dist.es2018/EventEmitter.d.ts

event emitters

import { EventSink } from './EventSink';
import { EventSource, Listener } from './EventSource';
/**
 * The same as node's EventEmitter but:
 * Only emits a single "event".
 * Throw an exception when a client registers the same listener more than once.
 * Throw an exception when a client tries to remove a listener that is not listening.
 */
export declare class EventEmitter<T> implements EventSink<T>, EventSource<T>, AsyncIterable<T> {
    protected listeners: Listener<T>[];
    emit(newMessage: T): void;
    subscribe(listener: Listener<T>): Listener<T>;
    unsubscribe(listener: Listener<T>): void;
    hasListeners(): boolean;
    [Symbol.asyncIterator](): AsyncIterator<T>;
    asyncIterator(): AsyncIterator<T>;
}