/**
 * Copyright 2021 Insta Industries, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 */
/**
 * A completer provides a `Promise` and handlers to either resolve or fail
 * the promise.
 *
 * It's useful to interop with non-async APIs. e.g. listening for an event
 * and resolving the promise accordingly.
 */
export declare class Completer<T> {
    constructor();
    resolve(value: T): any;
    fail(reason: any): any;
    get promise(): Promise<T>;
    get isCompleted(): boolean;
    get isCompletedSuccessfully(): boolean;
    private p;
    private resolveCb;
    private failCb;
    private completed;
    private succeeded;
    private resolvedValue;
}
/**
 * A CompleterGroup allows to register a set of completers, and obtain
 * a promise that resolves when all the completers promises are resolved.
 *
 * It's similar to having your list of Completers, and then calling
 * `Promise.all` on all the promises.
 */
export declare class CompleterGroup {
    add(): () => any;
    hasPendingWork(): boolean;
    waitUntilDone(): Promise<void>;
    private completers;
}
/**
 * Sleeps for `timeMs` milliseconds.
 *
 * @param setTimeout The timeout function.
 * @param timeMs The time to sleep in ms.
 */
export declare function sleep(setTimeout: (hander: TimerHandler, timeout?: number) => any, timeMs: number): Promise<void>;