ReadonlyhistoryOptional ReadonlymetadataLazily cloned, shallow-frozen metadata shared by this event's observers.
ReadonlypatchesLazily materialized event-local patches that transform the previously published state. Treat the shared snapshot as read-only.
ReadonlypositionReadonlystateBorrowed live state view. Mutate state only through Travels operations.
ReadonlytypeThe committed operation. Handle unrecognized values in a default branch.
Number of entries currently retained in history.