const worker = new Worker('my-queue');
const token = 'my-token';
// Use job.data to process this particular job.
// and set success variable if succeeded
[jobData, jobId] = await job.moveToCompleted('some return value', token);
await job.moveToFailed(new Error('some error message'), token);
job = Job.fromJSON(worker, jobData, jobId);
job = await worker.getNextJob(token);