Requiring a dynamically created file with Browserify

build.js

var Browserify = require('browserify');
var Readable = require('stream').Readable;

function stringStream(content) {
  var s = new Readable();
  s.push(content);
  s.push(null);
  return s;
}

var b = new Browserify();

/**
 * Exclude any modules we dynamically generate from being resolved by `module-deps`.
 * 
 * This can also be implemented by passing a function to Browserify's "filter" option,
 * if you have a more complex scenario.
 *
 * ```
 * var b = new Browserify({
 *   filter: function(id) {
 *     return id !== 'm1';
 *   }
 * });
 * ```
 */
b.exlcude('m1');

/**
 * In addition to telling b.require what we want to expose this module as,
 * give we can pass a filename that will be used when generating a source map
 */
b.require(stringStream('module.exports = 5'), {expose: 'm1', file: 'm1.js'});
b.add('./main.js');
b.bundle().pipe(process.stdout);

main.js

console.log(3 + require('m1'));

zzzz_example

$ node build
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
console.log(3 + require('m1'));

},{"m1":"m1"}],"m1":[function(require,module,exports){
module.exports = 5
},{}]},{},["m1",1]);

$ node build | node
8