import type { Option } from "../../Option";
import type * as T from "../Task/model";
import type { FiberRef } from "./model";
export declare const fiberRef: <A>(initial: A, fork: (a: A) => A, join: (a: A, a1: A) => A) => FiberRef<A>;
export declare const make: <A>(initial: A, onFork?: (a: A) => A, onJoin?: (a: A, a1: A) => A) => T.IO<FiberRef<A>>;
export declare const modify: <A, B>(f: (a: A) => [B, A]) => (fiberRef: FiberRef<A>) => T.IO<B>;
export declare const update: <A>(f: (a: A) => A) => (fiberRef: FiberRef<A>) => T.IO<void>;
export declare const set: <A>(a: A) => (fiberRef: FiberRef<A>) => T.IO<void>;
export declare const get: <A>(fiberRef: FiberRef<A>) => T.IO<A>;
export declare const getAndSet: <A>(a: A) => (fiberRef: FiberRef<A>) => T.IO<A>;
export declare const getAndUpdate: <A>(f: (a: A) => A) => (fiberRef: FiberRef<A>) => T.IO<A>;
export declare const getAndUpdateSome: <A>(f: (a: A) => Option<A>) => (fiberRef: FiberRef<A>) => T.IO<A>;
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