import type { Result } from './result.js';
type Tap = {
    <Res extends Result.Any>(fn: (value: Result.OkType<Res>) => void): (res: Res) => Res;
    <Res extends Result.Any>(fn: (value: Result.OkType<Res>) => void, res: Res): Res;
};
/**
 * Execute a side effect on the value of an `Ok` or skip if an `Err`.
 *
 * @tags effect
 */
export declare const tap: Tap;
export {};