import { Either } from "@tsplus/stdlib/data/Either/definition";
/**
 * Flatten nested `Either<E, Either<E1, A>>` into `Either<E | E1, A>`.
 * @tsplus getter Either flatten
 * @tsplus location "@tsplus/stdlib/data/Either/flatten"
 */
export declare function flatten<E, E2, A>(self: Either<E, Either<E2, A>>): Either<E | E2, A>;
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