import CancellationToken from './CancellationToken';
export default class CancellablePromise<T> implements PromiseLike<T> {
    #private;
    constructor(promise: PromiseLike<T>, cancellationToken?: CancellationToken);
    get cancelled(): boolean;
    cancel(): void;
    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | null | undefined, onrejected?: ((reason: unknown) => TResult2 | PromiseLike<TResult2>) | null | undefined): CancellablePromise<TResult1 | TResult2>;
    catch<TResult = never>(onrejected?: ((reason: unknown) => TResult | PromiseLike<TResult>) | null | undefined): CancellablePromise<T | TResult>;
    finally(onfinally?: ((promise: PromiseLike<T>, cancelled: boolean) => void)): this;
}