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I have some QObject-derived class Foo.

I register it using: qmlRegisterType<Foo>();

I have 2 classes exported to QML: one has this method:

Q_INVOKABLE Foo* createFoo();

Second one has this method:

Q_INVOKABLE void useFoo(const Foo*)

The code in QML:

var foo = firstClass.createFoo();

secondClass.useFoo(foo);

The last line of code generates exception that the parameter is unknown.

WORKAROUND: I had to remove const specifier from the useFoo parameter.

relates to

QTBUG-82354 Allow using const pointers as parameters of C++ functions called by QML

resulted in

QTBUG-61749 Unable to handle unregistered datatype 'const QQuickPointerDevice*' for property 'QQuickPointerEvent::device'