Optional
Optional dedicated blocking connection used by the backend's waitForJob primitive. Only workers provide it; other contexts (e.g. a plain Queue) leave it undefined since they never block waiting for jobs.
waitForJob
Returns a promise that resolves to a redis client. Normally used only by subclasses.
Returns the database type of the Redis instance the client is connected to,
Returns the version of the Redis instance the client is connected to,
Optional dedicated blocking connection used by the backend's
waitForJobprimitive. Only workers provide it; other contexts (e.g. a plain Queue) leave it undefined since they never block waiting for jobs.