Emits a value whenever event happens. Data emitted is { sinceLast, total }, where 'sinceLast' is milliseconds since last event and 'total' is total number of times event has been fired.
{ sinceLast, total }
Emits a value whenever event happens. Data emitted is
{ sinceLast, total }
, where 'sinceLast' is milliseconds since last event and 'total' is total number of times event has been fired.