Transforming an existing type into an STM in v3?

[xmo-odoo]

In V2, StateMachine.create({target: AClass.prototype}) could be used on more or less arbitrary prototypes and just integrate STM features into that. We use that to make UI widgets (with their own existing lifecycles) into STMs, in-place e.g.

export default class FileUploader: Widget {
    render() {
        // ...
    }
}
StateMachine.create({
    target: FileUploader.prototype,
    events: […]
});

It's not really clear how that's supposed to work in V3 and it's not really documented, looking at the code for factory it seems this would work:

StateMachine.factory(FileUploader, transitions: […]);

is that the correct migration?