Provide an event to modify available entry types on entry edit page

[Mosnar]

Description

Currently (as of Craft 3.5.15), there's no straight-forward way to modify the entry types available to a certain section. Adding an event to modify these would be great for:

• Non-standard requirements for permissions
• Restricting entry types based on site (especially useful for scenarios where not all page types are available on all sites)

Related Issues

#955
#853
#1628
#971

[brandonkelly]

Just added a new EVENT_DEFINE_ENTRY_TYPES event for 3.6:

Event::on(
    Entry::class,
    Entry::EVENT_DEFINE_ENTRY_TYPES,
    function(DefineEntryTypesEvent $event) {
        /** @var Entry $entry */
        $entry = $event->sender;
        $event->entryTypes = // ...
    }
);

[brandonkelly]

Craft 3.6 has now been officially released ✨