Similar to script imports from .qml files, the .mjs extension is used to
distinguish between ES modules and plain script files.
Change-Id: Id5f9b59fb77e99e3c9d6a404e6d091d96b501ad6
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Simon Hausmann