import type * as P from "@principia/prelude";
import type { Either, URI, V } from "./model";
/**
 * ```haskell
 * both_ :: Apply f => (f a, f b) -> f (a, b)
 * ```
 *
 * Applies both `Either`s and if both are `Right`, collects their values into a tuple, otherwise, returns the first `Left`
 *
 * @category Apply
 * @since 1.0.0
 */
export declare const both_: <E, A, G, B>(fa: Either<E, A>, fb: Either<G, B>) => Either<E | G, readonly [A, B]>;
/**
 * ```haskell
 * both :: Apply f => f b -> f a -> f (a, b)
 * ```
 *
 * Applies both `Either`s and if both are `Right`, collects their values into a tuple, otherwise, returns the first `Left`
 *
 * @category Apply
 * @since 1.0.0
 */
export declare const both: <G, B>(fb: Either<G, B>) => <E, A>(fa: Either<E, A>) => Either<G | E, readonly [A, B]>;
/**
 * ```haskell
 * pure :: Applicative f => a -> f a
 * ```
 *
 * Lifts a pure expression info an `Either`
 *
 * @category Applicative
 * @since 1.0.0
 */
export declare const pure: <E = never, A = never>(a: A) => Either<E, A>;
/**
 * @category Instances
 * @since 1.0.0
 */
export declare const Applicative: P.Applicative<[URI], V>;
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