Stream a wretch response directly to a file in node.js

streamWretchResponseToFile.ts

import wretch, { WretchResponse } from 'wretch'
import fs from 'node:fs'

async function streamWretchResponseToFile(
  res: WretchResponse,
  writable: fs.WriteStream,
) {
  if (!res.body) {
    throw new Error('Response body is null')
  }

  // @ts-expect-error node 18 wrong types
  const readable = stream.Readable.fromWeb(res.body)

  readable.pipe(writable)

  await new Promise<void>((resolve, reject) => {
    writable.on('error', (err) => reject(err))
    writable.on('close', () => resolve())
  })
}