test.js

/* test.js */
var { Loader } = Components.utils.import("resource://gre/modules/commonjs/toolkit/loader.js", {});
var loader = Loader.Loader({
  paths: {
    "": "file:///home/yurenju/src/gaia/xulrunner-sdk/bin/"
  },
  resolve: function(id, base) {
    return Loader.resolve(id, base);
  }
});
var module = Loader.Module("main", "gaia://");
var require = Loader.Require(loader, module);

var t = require('testmodule');
print(t.area());

testmodule.js

/* testmodule.js */
exports.area = function() {
  return 'area';
};