import type { Option } from "../../../Option";
import * as M from "../../Managed";
import * as T from "../../Task";
export declare class Transducer<R, E, I, O> {
   readonly push: M.Managed<R, never, (c: Option<ReadonlyArray<I>>) => T.Task<R, E, ReadonlyArray<O>>>;
   constructor(push: M.Managed<R, never, (c: Option<ReadonlyArray<I>>) => T.Task<R, E, ReadonlyArray<O>>>);
}
/**
 * Contract notes for transducers:
 * - When a None is received, the transducer must flush all of its internal state
 *   and remain empty until subsequent Some(Chunk) values.
 *
 *   Stated differently, after a first push(None), all subsequent push(None) must
 *   result in empty [].
 */
export declare const transducer: <R, E, I, O, R1>(
   push: M.Managed<R, never, (c: Option<readonly I[]>) => T.Task<R1, E, readonly O[]>>
) => Transducer<R & R1, E, I, O>;
/**
 * Compose this tansducer with another transducer, resulting in a composite transducer.
 */
export declare const then: <R1, E1, O, O1>(
   that: Transducer<R1, E1, O, O1>
) => <R, E, I>(self: Transducer<R, E, I, O>) => Transducer<R & R1, E1 | E, I, O1>;
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