I’m not sure, but I don’t think it is possible from QML. Maybe using C++ is a valid option for you?

Just try to load dummy qml file who has ‘import yourplugin’, if it’s fails then plugin is unavailable.

Never tried myself, it’s a idea.

There isn’t any official, built-in way to do this from QML in Qt Quick 1.x. It isn’t especially elegant, but as minimoog77 suggested, a workaround is to use Loader or dynamic item creation to try and load a file with the needed import, and then check whether or not you’ve received any errors.

Hopefully we’ll have a better solution for this in a future version of QML.