import { Stream } from "@effect/core/stream/Stream/definition";
import { Either } from "@tsplus/stdlib/data/Either/definition";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * Fails with the error `None` if value is `Right`.
 * @tsplus getter effect/core/stream/Stream left
 * @tsplus location "@effect/core/stream/Stream/operations/left"
 */
export declare function left<R, E, A1, A2>(self: Stream<R, E, Either<A1, A2>>): Stream<R, Maybe<E>, A2>;
//# sourceMappingURL=left.d.ts.map