/// <reference types="node" />
import { EventEmitter } from "events";
/**
 * Creates a promise that resolves after a delay
 *
 * @param delayMS the length of time to delay in milliseconds.
 */
export declare function Delay(delayMS: number): Promise<void>;
/**
 * Asynchronously waits for the predicate condition to turn false, with a delay between checks
 * @param predicate - a fn that returns a boolean
 * @param delay - number of milliseconds to async delay between checks.
 */
export declare function While(predicate: () => boolean, delay?: number): Promise<void>;
/**
 * Asynchronously waits for the predicate condition to turn true, with a delay between checks
 * @param predicate - a fn that returns a boolean
 * @param delay - number of milliseconds to async delay between checks.
 */
export declare function Until(predicate: () => boolean, delay?: number): Promise<void>;
/**
 * An async wrapper for waiting for an event to trigger once
 * @param emitter - an event emitter
 * @param event - the name of the event to wait for.
 */
export declare function When<T>(emitter: EventEmitter, successEvent?: string, errorEvent?: string): Promise<T>;
export declare function Async<T>(fn: () => T, msec?: number): Promise<T>;
export declare function Timeout<T>(p: Promise<T>, msec: number): Promise<T>;