import { Stream } from "@effect/core/stream/Stream/definition";
import { Maybe } from "@tsplus/stdlib/data/Maybe/definition";
/**
 * An implementation of `Stream.merge` that supports breadth first search.
 */
export declare function mergeStream<R, A, R2>(left: Stream<R, never, Maybe<A>>, right: Stream<R2, never, Maybe<A>>): Stream<R | R2, never, Maybe<A>>;
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