/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
/**
 * A deferred creates a promise and the ability to resolve or reject it
 * @legacy @beta
 */
export declare class Deferred<T> {
    private readonly p;
    private res;
    private rej;
    private completed;
    constructor();
    /**
     * Returns whether the underlying promise has been completed
     */
    get isCompleted(): boolean;
    /**
     * Retrieves the underlying promise for the deferred
     *
     * @returns the underlying promise
     */
    get promise(): Promise<T>;
    /**
     * Resolves the promise
     *
     * @param value - the value to resolve the promise with
     */
    resolve(value: T | PromiseLike<T>): void;
    /**
     * Rejects the promise
     *
     * @param value - the value to reject the promise with
     */
    reject(error: any): void;
}
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