A job was added to the queue
A job has finished successfully
The queue is empty, jobs may be running
A job has failed
Emitted just after `"error", a job has failed - this event gives access to the job and the thrown error
All jobs have finished and the queue is empty
A job has finished or failed
Emitted just after `"completed", a job has finished successfully - this event gives access to the job and it's result
A job is about to start running