import { Effect } from "@effect/core/io/Effect/definition";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * Unwraps the optional error, defaulting to the provided value.
 * @tsplus static effect/core/io/Effect.Aspects flattenErrorMaybe
 * @tsplus pipeable effect/core/io/Effect flattenErrorMaybe
 * @tsplus location "@effect/core/io/Effect/operations/flattenErrorMaybe"
 */
export declare function flattenErrorMaybe<E1>(def: E1): <R, E, A>(self: import("../definition").Effect<R, import("@tsplus/stdlib/data/Maybe").Maybe<E>, A>) => import("../definition").Effect<R, E1 | E, A>;
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