test-simple-test-child-process-stdio-redirect.js

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var common = require('../common');
var assert = require('assert');

switch (process.argv[2]) {
  case 'child':
    return child();
  case undefined:
    return parent();
  default:
    throw new Error('wtf?');
}

function parent() {
  var net = require('net');
  var spawn = require('child_process').spawn;

  var c = process.execPath
  var a = [__filename, 'child']
  var child = spawn(c, a, { stdio: ['ignore', 'pipe', '&1'] });

  assert.equal(child.stdout, child.stderr);

  child.stdout.setEncoding('utf8');
  var received = '';
  child.stdout.on('data', function(c) {
    received += c;
  });
  child.on('close', function() {
    assert.equal(received, 'out\nerr\nout2\nerr2\n');
    console.log('ok');
  });
}

function child() {
  console.log('out');
  setTimeout(function() {
    console.error('err');
    setTimeout(function() {
      console.log('out2');
      setTimeout(function() {
        console.error('err2');
      });
    });
  });
}

I get the following error:

TypeError: Asynchronous forks do not support Buffer input: '&1'