SMD

smd.js

var __modules__ = {};

function require(id) {
  var module = __modules__[id];

  if(!module) throw new Error('Module not yet defined');

  // Get the module's exports lazily (allows registration in any order as long
  // as main script entry point comes last).
  return __modules__[id] = (typeof(module) === 'function') ?
    module(require, {}) : module;
}

function define(id, factory) {
  if (__modules__[id]) throw new Error('Another module already has this name');
  __modules__[id] = factory;
}