====== C++ CODE ======
    Q_PROPERTY(QString test READ test NOTIFY testChanged)

    Q_SIGNAL void testChanged();
    QString test() const {
        return "I am a property";
    }

    Q_INVOKABLE QString test(QString param) const {
        return QString("I am a function and my parameter is '%1'").arg(param);
    }

=========== QML CODE ===========
console.log("AppSettings test property:", appSettings.test);
console.log("AppSettings function:", appSettings.test("Hello"));

=========== QML OUTPUT =========
AppSettings test property: I am a property
main.qml:39: TypeError: Result of expression 'appSettings.test' [I am a property] is not a function.