import type { Stream } from "./definitions";
/**
 * Like `flattenPar`, but executes all streams concurrently.
 */
export declare function flattenParUnbounded<R, R1, E, E1, O1>(self: Stream<R, E, Stream<R1, E1, O1>>, outputBuffer?: number): Stream<R & R1, E | E1, O1>;
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