feat: expose repeatable queue functions

• getNextMillis
• getRepeatJobId
• getRepeatKey

Use cases

custom getNextMillis

use at your own risk

queue = new Bull('randomIntervalQueue');
queue.getNextMillis = function(millis, opts) {
          if (opts.cron) {
            throw new Error(
              '.cron options are not supported in this queue'
            );
          }

          if (!opts.every) {
            throw new Error(
              '.every options must be provided in this queue'
            );
          }

          return Math.floor(Math.floor(millis / opts.every) * opts.every + opts.every + Math.random() * opts.every);
        };

getRepeatKey for removing repeatable job

const [job] = await queue.getRepeatableJobs();
const jobKey = queue.getRepeatKey(job.name, job.opts.repeat, job.opts.repeat.jobId + ':');
await queue.removeRepeatableByKey(jobKey);

getRepeatJobId for getting job

const [job] = await queue.getRepeatableJobs();
const jobId = queue.getRepeatJobId(job.name, job.id + ':', job.next, md5(job.key));
const fullJob = queue.getJob(jobId);