import { Rhodium } from "../Rhodium.mts";
export declare const Cancelled: unique symbol;
export declare function cancellableCallback<D extends unknown, P>(callback: ((...args: [D, signal: AbortSignal]) => P) | null | undefined, 
/** Can only be called inside the returned callback, not synchronously */
child: Rhodium<any, any>, parent: Rhodium<any, any>): NoInfer<(value: D | typeof Cancelled) => P | typeof Cancelled> | null | undefined;