App doesn't exit when I use this library

[bmaupin]

Oddly enough, I ran across this exact same problem testing winston-syslog: winstonjs/winston-syslog#155

If I test bunyan by itself, then this code runs and exits normally:

const bunyan = require('bunyan');

const logger = bunyan.createLogger({
  name: 'graylog-syslog-bunyan',
});

logger.error('Test message');

However, when I use this library, the app no longer exits:

const bunyan = require('bunyan');
const bsyslog = require('bunyan-syslog');

const logger = bunyan.createLogger({
  name: 'graylog-syslog-bunyan',
  streams: [
    {
      level: 'debug',
      type: 'raw',
      stream: bsyslog.createBunyanStream({
        host: '127.0.0.1',
        port: 5140,
      }),
    },
  ],
});

logger.error('Test message');

Instead, I have to manually exit:

setTimeout(() => {
  process.exit();
}, 500);

Some more information in case it helps:

$ node --version
v14.17.5
$ grep bunyan package.json
    "bunyan": "^1.8.15",
    "bunyan-syslog": "^0.3.3",

Thanks!