bullmq job queue in Remix

index.tsx

import notifierQueue from "~/queues/notifier.server.ts";

export const loader = async () => {
    await notifierQueue.add("test", { emailAddress: "[email protected]" });

    return null;
};

notifier.server.ts

import { Queue } from "~/utils/queue.server";

type QueueData = {
	emailAddress: string;
};

export const queue = Queue<QueueData>("notifier", async (job) => {
	console.log(`Sending email to ${job.data.emailAddress}`);

	// Delay 1 second to simulate sending an email, be it for user registration, a newsletter, etc.
	await new Promise((resolve) => setTimeout(resolve, 1000));

	console.log(`Email sent to ${job.data.emailAddress}`);
});

queue.server.ts

import {
	type Processor,
	Queue as BullQueue,
	Worker,
	QueueScheduler,
} from "bullmq";

import redis from "./redis.server";

type RegisteredQueue = {
	queue: BullQueue;
	worker: Worker;
	scheduler: QueueScheduler;
};

declare global {
	var __registeredQueues: Record<string, RegisteredQueue> | undefined;
}

const registeredQueues = global.__registeredQueues || (global.__registeredQueues = {});

export function Queue<Payload>(name: string, handler: Processor<Payload>): BullQueue<Payload> {
	if (registeredQueues[name]) {
		return registeredQueues[name].queue;
	}

	const queue = new BullQueue<Payload>(name, { connection: redis });
	const worker = new Worker<Payload>(name, handler, { connection: redis });
	const scheduler = new QueueScheduler(name, { connection: redis });

	registeredQueues[name] = { queue, scheduler, worker };

	return queue;
}

redis.server.ts

import Redis, { type Redis as RedisType, type RedisOptions } from "ioredis";

let redis: RedisType;

declare global {
	var __redis: RedisType | undefined;
}

const redisOptions: RedisOptions = {
	maxRetriesPerRequest: null,
	enableReadyCheck: false,
};

// this is needed because in development we don't want to restart
// the server with every change, but we want to make sure we don't
// create a new connection to the Redis with every change either.
if (process.env.NODE_ENV === "production") {
	redis = new Redis(process.env.REDIS_URL, redisOptions);
} else {
	if (!global.__redis) {
		global.__redis = new Redis(process.env.REDIS_URL, redisOptions);
	}
	redis = global.__redis;
}

export default redis;