import type { RuntimeFiber } from "../Fiber";
import * as T from "../Task/_core";
import type { Atomic } from "../XRef";
import { Supervisor } from "./model";
/**
 * Creates a new supervisor that tracks children in a set.
 */
export declare const track: T.IO<Supervisor<RuntimeFiber<any, any>[]>>;
/**
 * Creates a new supervisor that tracks children in a set.
 */
export declare const fibersIn: (
   ref: Atomic<Set<RuntimeFiber<any, any>>>
) => T.IO<Supervisor<Set<RuntimeFiber<any, any>>>>;
/**
 * A supervisor that doesn't do anything in response to supervision events.
 */
export declare const none: Supervisor<void>;
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