Replacements for through

stream.Writable (native, Node.js)

The native stream.Writable class can be used to create writable streams. It is a suitable replacement when through is being used only as a sink that consumes data, rather than as a duplex/transform stream that forwards data.

import through from 'through'
import { Writable } from 'node:stream'

through(fn) 
new Writable({ 
  write: (chunk, encoding, callback) => { 
    fn(chunk) 
    callback() 
  } 
})