Is there any similar solution to qml to react on property change?

[qarmin]

e.g. in qml if property

property int width: 20

will be changed

width = 30;

this function will be executed

onWidthChanged(width): {
    console.error("changed width to:", width)
}

Is there any similar solution in slint, or I need to use callback set_width if I want to get similar functionality?

[bjorn]

Such a callback does not exist automatically yet, so indeed for now you'd have to add an explicit one. See issue #112 about this feature.