A node polyfill for process.stderr in a browser

browser-stderr.js

var WritableStream = require('stream');
var inherits = require('util').inherits;

module.exports = BrowserStderr;


inherits(BrowserStderr, WritableStream);

function BrowserStderr(opts) {
  if (!(this instanceof BrowserStderr)) return new BrowserStderr(opts);

  opts = opts || {};
  WritableStream.call(this, opts);
  this.label = (opts.label !== undefined) ? opts.label : 'stderr';
}

BrowserStderr.prototype.write = function(chunks, encoding, cb) {
  var output = chunks.toString ? chunks.toString() : chunks;
  if (this.label === false) {
    console.log(output);
  } else {
    console.log(this.label+':', output);
  }
  process.nextTick(cb);
}