import extend from 'extend';


var object1 = { definedProperty:'value' };
var object2 = {};

object2 = extend(object2, {
	maybeUndefinedProperty: object1.maybeUndefinedProperty
});



var object1 = { definedProperty:'value' };
var object2 = {};

if ('maybeUndefinedProperty' in object1)
	object2.maybeUndefinedProperty = object1.maybeUndefinedProperty;