Redis connection error event handler is set ONLY after connection is established

Bull Version: 1.40.1

const queue = new Queue('test', {
    connection: {
        host: 'localhost',
        port: 6379,
    },
});

queue.on('error', () => console.log('Something went wrong!'));

An unhandled error event is logged by IORedis when creating a new queue with no redis server available.

[ioredis] Unhandled error event: Error: connect ECONNREFUSED 127.0.0.1:6379
    at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1142:16)

If there is a redis server available during the queue creation and somehow lost connection to the redis server, the queue will emit an error with Something went wrong!.

After some investigation, I found out that the error event hook is set after a initializing has been resolved. However, in the case where there is no redis server available during queue creation, it will be stuck in waitUntilReady promise and thus not setting the error event hook.

I will suggest to place the hook at here instead of after the initializing has been resolved. What you do think?

[manast]

That is quite strange considering there are 231 tests in total…

[YimingIsCOLD]

Alright! I will create a PR to address this.