/**
 * Copyright (c) 2017-present A. Matías Quezada <amatiasq@gmail.com>
 */
export default class CancellablePromise<T> extends Promise<T> {
    protected _cancel: CancellableExecutor;
    protected _onCancel: CancelListener[];
    protected _isCancelled: boolean;
    constructor(executor: Executor<T>);
    cancel(): boolean;
    then<TResult1 = T, TResult2 = never>(onfulfilled?: OnFulfilled<T, TResult1>, onrejected?: OnRejected<TResult2>, oncancel?: OnCancelled): CancellablePromise<TResult1 | TResult2>;
}
export declare type CancellableExecutor = CancelPromise | CancellablePromise<any> | null;
export declare type CancelPromise = () => boolean;
export declare type CancelListener = () => void;
export declare type Resolver<T> = (value?: T | PromiseLike<T>) => void;
export declare type Rejector = (reason?: any) => void;
export declare type Executor<T> = (resolve: Resolver<T>, reject: Rejector) => CancellableExecutor;
export declare type OnFulfilled<T, TResult1> = (value: T) => TResult1 | PromiseLike<TResult1>;
export declare type OnRejected<TResult2> = (reason: any) => TResult2 | PromiseLike<TResult2>;
export declare type OnCancelled = (() => void);