how to declare a global variable or export it as CJS or AMD module if posible. 'this' must refer to global object or you can put this code into global scope

declaration.js

  // myModule - is our global we want to export
var root = this;

if (typeof(exports) !== 'undefined') {
    if (typeof(module) !== 'undefined' && module.exports) {
	    exports = module.exports = myModule;
    }
    exports.myModule = myModule;
} else {
	if (typeof define === 'function' && define.amd) {
		define('myModule', [], function(){ return myModule; }); 
	}
	root.myModule = myModule;
}