import { Effect } from "@effect/core/io/Effect/definition";
/**
 * Folds over the failure value or the success value to yield an effect that
 * does not fail, but succeeds with the value returned by the left or right
 * function passed to `fold`.
 * @tsplus static effect/core/io/Effect.Aspects fold
 * @tsplus pipeable effect/core/io/Effect fold
 * @tsplus location "@effect/core/io/Effect/operations/fold"
 */
export declare function fold<E, A, A2, A3>(failure: (e: E) => A2, success: (a: A) => A3): <R>(self: import("../definition").Effect<R, E, A>) => import("../definition").Effect<R, never, A2 | A3>;
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