import { Stream } from "@effect/core/stream/Stream/definition";
/**
 * Like `flattenPar`, but executes all streams concurrently.
 * @tsplus fluent ets/Stream flattenParUnbounded
 * @tsplus location "@effect/core/stream/Stream/operations/flattenParUnbounded"
 */
export declare function flattenParUnbounded<R, E, A, R1, E1>(self: Stream<R, E, Stream<R1, E1, A>>, outputBuffer?: number, __tsplusTrace?: string): Stream<R | R1, E | E1, A>;
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