/*! *****************************************************************************
Copyright (c) Microsoft Corporation.
Licensed under the Apache License, Version 2.0.

See LICENSE file in the project root for details.
***************************************************************************** */
import { CancellationToken } from "./cancellation";
import { Cancelable } from "@esfx/cancelable";
/**
 * Asynchronously notifies one or more waiting Promises that an event has occurred.
 */
export declare class Pulsar {
    private _waiters;
    /**
     * Notifies the next waiter.
     */
    pulse(): void;
    /**
     * Notifies all waiters.
     */
    pulseAll(): void;
    /**
     * Asynchronously waits for the the next pulse.
     *
     * @param token A CancellationToken used to cancel the request.
     */
    wait(token?: CancellationToken | Cancelable): Promise<void>;
}