import * as E from "../../Either";
import type { XRef } from "./model";
/**
 * Transforms the `set` value of the `XRef` with the specified fallible
 * function.
 */
export declare const contramapEither: <A, EC, C>(
   f: (_: C) => E.Either<EC, A>
) => <EA, EB, B>(_: XRef<EA, EB, A, B>) => XRef<EC | EA, EB, C, B>;
/**
 * Transforms the `set` value of the `XRef` with the specified fallible
 * function.
 */
export declare const contramapEither_: <A, EC, C, EA, EB, B>(
   _: XRef<EA, EB, A, B>,
   f: (_: C) => E.Either<EC, A>
) => XRef<EC | EA, EB, C, B>;
/**
 * Transforms the `set` value of the `XRef` with the specified function.
 */
export declare const contramap: <A, C>(f: (_: C) => A) => <EA, EB, B>(_: XRef<EA, EB, A, B>) => XRef<EA, EB, C, B>;
/**
 * Transforms the `set` value of the `XRef` with the specified function.
 */
export declare const contramap_: <EA, EB, B, A, C>(_: XRef<EA, EB, A, B>, f: (_: C) => A) => XRef<EA, EB, C, B>;
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