import type { Either, Left, Right } from "./model";
/**
 * ```haskell
 * isLeft :: Either e a -> is Left e
 * ```
 *
 * Returns `true` if the either is an instance of `Left`, `false` otherwise
 *
 * @category Guards
 * @since 1.0.0
 */
export declare const isLeft: <E, A>(fa: Either<E, A>) => fa is Left<E>;
/**
 * ```haskell
 * isRight :: Either e a -> is Right a
 * ```
 *
 * Returns `true` if the either is an instance of `Right`, `false` otherwise
 *
 * @category Guards
 * @since 1.0.0
 */
export declare const isRight: <E, A>(fa: Either<E, A>) => fa is Right<A>;
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