Foxy triggers events with the event dispatcher system of Composer allowing you to extend Foxy's capabilities. To do this, you must create a Composer plugin requiring Foxy in addition to the requirements required for the creation of a Composer plugin. You can read the documentation of Composer: Setting up and using plugin.
All event names are listed in constants of the Foxy\FoxyEvents class containing the name of
the event class for each event.
The foxy.pre-solve event occurs before the solve action of asset packages and after the
Composer's command events post-install-cmd and post-update-cmd.
The foxy.get-assets event occurs before the solve action of asset packages and during the
retrieves the map of the asset packages. It is in this event that you can add new asset packages
in the map.
The foxy.post-solve event occurs after the solve action of asset packages and before the
execution of the Composer's fallback.