import { Event } from './event';
export type CancellationToken = {
    readonly isCancellationRequested: boolean;
    readonly onCancellationRequested: Event<void>;
};
export declare namespace CancellationToken {
    function is(thing: unknown): thing is CancellationToken;
    const None: CancellationToken;
    const Cancelled: CancellationToken;
}
export declare class CancellationTokenSource {
    private _token?;
    get token(): CancellationToken;
    cancel(): void;
    dispose(cancel?: boolean): void;
}
export declare function cancelled(): Error;
export declare function isCancelled(err: Error | undefined): boolean;
export declare function checkCancelled(token?: CancellationToken): void;
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