/// <reference types="node" />

import {DuplexOptions} from 'node:stream';
import {TypedDuplex} from './typed-streams';
import {Arg0, Ret} from './defs';

export = asStream;

/**
 * Wraps a function in a duplex stream
 * @param fn function to wrap
 * @param options options for the wrapping duplex stream
 * @returns a duplex stream
 */
declare function asStream<F extends (chunk: any, encoding?: string) => unknown>(
  fn: F,
  options?: DuplexOptions
): TypedDuplex<Arg0<F>, Ret<F>>;