@cobalt-engine/co-browserify/test/tr_order/replace_bbb.js

browser-side require() the node way

var through = require('through2');

module.exports = function(file) {
  return through(function (buf, enc, next) {
    this.push(String(buf)
        .replace(/AAA/g, '6')
        .replace(/BBB/g, '50')
    );
    next();
  })
}