This type alias has now been fully documented for public consumption.
This will be beneficial to the sphinx ecosystem,
to aide/encourage extension developers to provide the correct metadata.
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
So far, we need to bypass application object for modules to emit
a event. This make EventManager portable and easy to pass event
emitter. This brings modules less coupled with application object.
