import type { Fn } from "@thi.ng/api";
import type { Transducer } from "./api.js";
/**
 * Helper transducer. Applies given `fn` to each input value, presumably
 * for side effects. Discards function's result and yields original
 * inputs.
 *
 * @param fn - side effect
 */
export declare const sideEffect: <T>(fn: Fn<T, void>) => Transducer<T, T>;
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