import * as Tp from "../../../../Collections/Immutable/Tuple";
import * as O from "../../../../Option";
import type * as C from "../core";
/**
 * Creates a stream by peeling off the "layers" of a value of type `S`
 */
export declare function unfold<S, A>(s: S, f: (s: S) => O.Option<Tp.Tuple<[A, S]>>): C.UIO<A>;
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