export interface DeferredResolver<R> {
    /**
     * Returns a reference to the controlled promise that can be passed to clients.
     */
    promise: Promise<R>;
    /**
     * Resolve the underlying promise with `value` as the resolution value. If `value` is a thenable or a promise, the underlying promise will assume its state.
     */
    resolve(value: R): void;
    resolve(): void;
    /**
     * Reject the underlying promise with `reason` as the rejection reason.
     */
    reject(reason: any): void;
    /**
     * Gives you a callback representation of the `PromiseResolver`. Note that this is not a method but a property.
     * The callback accepts error object in first argument and success values on the 2nd parameter and the rest, I.E. node js conventions.
     *
     * If the the callback is called with multiple success values, the resolver fulfills its promise with an array of the values.
     */
    callback(err: any, value: R, ...values: R[]): void;
}
/**
 * A deferred promise that can be resolved or rejected
 * externally, ideal for functions like a promise timeout
 */
export declare class Deferred<T> {
    static delay(millis: number): Promise<void>;
    static resolve<T>(value?: T): Deferred<T>;
    private result;
    private cancelCallback;
    private state;
    readonly promise: Promise<T>;
    constructor(promise?: Promise<T> | undefined);
    isSettled(): boolean;
    isCancelled(): boolean;
    cancel(): void;
    getResult(): T;
    onCancel(cancelCallback: DeferredCancelCallback<T>): void;
    resolve(result?: T | undefined): void;
    reject(err: any): void;
}
export declare type DeferredCancelCallback<T> = (deferred: Deferred<T>) => void;
export default Deferred;