Experimental Event API: add rootEventTypes
support to event responders
#15475
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This PR adds support for event responder having
rootEventTypes
without needing to dynamically add them during a target event type inonEvent
.Like
targetEventTypes
, event responders now supportrootEventTypes
as an array of possible events. To properly track these and unmount them, the event component instance object has arootEventTypes
property that we use for tracking the mounting/unmounting of root events. Also andinvariant
has been added to ensure we don't add duplicate root event types – otherwise, when we remove a root event type things will fall out of sync.