node multiprocess

index.js

import * as throng from 'throng';

const { WEB_CONCURRENCY = 1, PORT = "" } = process.env;

const start = async (id: number) => {
  /*
   * This could be imported statically at the top, but then the master process
   * could be crashed.
   */
  const server = require('./server').default;
  try {
    await slackListener.start(PORT);
    console.log(`Worker ${id} listening on port ${PORT}`);
  } catch (e) {
    console.error(e);
  }
  process.on('exit', () => {
    console.log(`Worker ${id} exiting...`);
  });
};

throng({
  workers: WEB_CONCURRENCY,
  start
});