import type * as P from "@principia/prelude";
import type { IO, URI, V } from "./model";
/**
 * ```haskell
 * both_ :: Apply f => (f a, f b) -> f (a, b)
 * ```
 *
 * Applies both `IO`s and collects their results into a tuple
 *
 * @category Apply
 * @since 1.0.0
 */
export declare const both_: <A, B>(fa: IO<A>, fb: IO<B>) => IO<readonly [A, B]>;
/**
 * ```haskell
 * both :: Apply f => f b -> f a -> f (a, b)
 * ```
 *
 * Applies both `IO`s and collects their results into a tuple
 *
 * @category Apply
 * @since 1.0.0
 */
export declare const both: <B>(fb: IO<B>) => <A>(fa: IO<A>) => IO<readonly [A, B]>;
/**
 * ```haskell
 * pure :: Applicative f => a -> f a
 * ```
 *
 * Lifts a pure expression info an `IO`
 *
 * @category Applicative
 * @since 1.0.0
 */
export declare const pure: <A>(a: A) => IO<A>;
export declare const Applicative: P.Applicative<[URI], V>;
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