Cloudflare worker - Example for Queue scaling

index.ts

//https://www.npmjs.com/package/round-robin-js
import { RandomRoundRobin } from 'round-robin-js';

async function sender(queue: string, message: any, env: Env) {
  try {
    const processors = {
      PROCESSOR1: env.ENVIRONMENT === 'dev' ? env.PROCESSOR1_DEV : env.PROCESSOR1,
      PROCESSOR2: env.ENVIRONMENT === 'dev' ? env.PROCESSOR2_DEV : env.PROCESSOR2,
      PROCESSOR3: env.ENVIRONMENT === 'dev' ? env.PROCESSOR3_DEV : env.PROCESSOR3,
      PROCESSOR4: env.ENVIRONMENT === 'dev' ? env.PROCESSOR4_DEV : env.PROCESSOR4,
    };

    const processor = processors[queue];

    if (processor) {
      await processor.send(message);
      message.ack();
    }
  } catch (error) {
    console.log(error);
    throw error;
  }
}

async function response(request: Request, env: Env, writeKey: string) {
    const data = (await request.json()) as Data;
    const queues = new RandomRoundRobin<string>(['PROCESSOR1', 'PROCESSOR2', 'PROCESSOR3', 'PROCESSOR4']);
    const queue = queues.next().value;
    const message = {
      data
    };
    await sender(queue, message, env);
}

I'm sorry good point. I fixed it!