import { Effect } from "@effect/core/io/Effect/definition";
import { Stream } from "@effect/core/stream/Stream/definition";
import { GroupBy } from "@effect/core/stream/GroupBy/definition/base";
/**
 * More powerful version of `Stream.groupByKey`.
 * @tsplus static effect/core/stream/Stream.Aspects groupBy
 * @tsplus pipeable effect/core/stream/Stream groupBy
 * @tsplus location "@effect/core/stream/Stream/operations/groupBy"
 */
export declare function groupBy<A, R2, E2, K, V>(f: (a: A) => Effect<R2, E2, readonly [K, V]>, buffer?: number): <R, E>(self: import("../definition").Stream<R, E, A>) => import("../../GroupBy").GroupBy<R2 | R, E2 | E, K, V, A>;
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