text: 'use strict';
  
  const common = require('../common');
  const { Readable, Writable } = require('stream');
  
  const bench = common.createBenchmark(main, {
    n: [5e6]
  });
  
  function main({ n }) {
    const b = {};
    const r = new Readable({ objectMode: true });
    const w = new Writable({ objectMode: true });
  
    let i = 0;
  
    r._read = () => r.push(i++ === n ? null : b);
    w._write = (data, enc, cb) => cb();
  
    bench.start();
  
    r.pipe(w);
    w.on('finish', () => bench.end(n));
  }
  