import type { Fn } from "@thi.ng/api";
import type { Reducer } from "./api.js";
/**
 * Helper function to post-process the result of an existing {@link Reducer}
 * using the provided final transformation function. Returns a new reducer which
 * augments the completion function of the given reducer.
 *
 * @example
 * ```ts tangle:../export/post-process.ts
 * import { postProcess, push, range, take, transduce } from "@thi.ng/transducers";
 *
 * // initial setup
 * console.log(transduce(take(5), push(), range()));
 * // [ 0, 1, 2, 3, 4 ]
 *
 * // now augment reducer to post-process final result
 * console.log(
 *   transduce(take(5), postProcess(push(), x => x.join("|")), range())
 * );
 * // 0|1|2|3|4
 * ```
 *
 * @param rfn
 * @param fn
 */
export declare const postProcess: <A, B, C>(rfn: Reducer<A, B>, fn: Fn<B, C>) => Reducer<A, C>;
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