OptionalactorUUID of that token's actor, if any.
The Foundry CONST.REGION_EVENTS value.
OptionalregionThe region's id.
OptionalregionThe region's display name.
OptionalregionUUID of the region the event fired on.
OptionalsceneUUID of the scene the region belongs to.
OptionaltokenUUID of the token that entered/exited/acted.
The resolved Foundry region/token/scene identifiers the bridge hands to buildRegionTriggerContext — the Foundry objects are reduced to UUIDs and names at the boundary so the trigger-shaping logic stays Foundry-free.