import { Event } from './events';
export interface CancellationToken {
    /**
     * Is `true` when the token has been cancelled, `false` otherwise.
     */
    isCancellationRequested: boolean;
    /**
     * An [event](#Event) which fires upon cancellation.
     */
    onCancellationRequested: Event<any>;
}
export declare namespace CancellationToken {
    const None: CancellationToken;
    const Cancelled: CancellationToken;
}
export declare class CancellationTokenSource {
    private _token;
    token: CancellationToken;
    cancel(): void;
    dispose(): void;
}