[TIMOB-15663] Android: Cannot require Facebook module inside a CommonJS module

Problem description

Trying to include the Facebook module inside a CommonJS module fails.

Code to reproduce

app.js

var fb = require('ui/facebook');
fb.post();

ui/facebook.js

exports.post = function() {
	var fb = require('facebook');
	fb.appid = Ti.App.Properties.getString('ti.facebook.appid');
	fb.permissions = ['publish_stream'];
	fb.forceDialogAuth = true;
	fb.authorize();
};

Notes

Moving the content of the function from ui/facebook.js to app.js solves the problem. The module is registered in tiapp.xml, as well as the property ti.facebook.appid. The module is not defined; this means, the authorize method is invalid in the sample above.