In Bindows getter and setter methods can be declared as normal, e.g.: _p.getX = function(){return this._x}; _p.setX = function(x){this._x = x}; But we also use this this special method to declare them like this: ClassName.addProperty("x", Function.READ_WRITE); This creates a public variable x along with both a getter and a setter in the class. Currently Intellij doesn't understand these constructs... There are ways of creating a read-only variable and a write-only variable. Here follows a declaration of a simple Bindows class that has three member variables: function ClassName() { if (_biInPrototype) return; SuperClass.call(this); } _p = _biExtend(ClassName, SuperClass, "ClassName"); ClassName.addProperty("x", Function.READ_WRITE); // translates into both a getter and a setter ClassName.addProperty("y", Function.READ); // translates into a getter only ClassName.addProperty("z", Function.WRITE); // translates into a setter only Please consider upgrading your support for Bindows.