import { Either } from "@tsplus/stdlib/data/Either/definition";
/**
 * Use `E => E1` to transform `Either<E, A>` to `Either<E1, A>`
 * @tsplus static Either.Aspects mapLeft
 * @tsplus pipeable Either mapLeft
 * @tsplus location "@tsplus/stdlib/data/Either/mapLeft"
 */
export declare function mapLeft<E, E1>(f: (e: E) => E1): <A>(self: import("./definition").Either<E, A>) => import("./definition").Either<E1, A>;
//# sourceMappingURL=mapLeft.d.ts.map