async_winston.js

var winston = require('winston');
require('winston-papertrail').Papertrail

const winstonConsole = new winston.transports.Console()
const winstonPapertrail = new winston.transports.Papertrail({
  host: 'logs5.papertrailapp.com',
  port: xxxx,
  flushOnClose: true,
})

const logger = new winston.Logger({
  transports: [winstonConsole, winstonPapertrail],
});

function sleep(ms) {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function displayProgress() {
  const message = `It's ${new Date()}`
  logger.info(message)

  // These don't fix the problem:
  // winstonPapertrail.on('connect', (message) => {
  //   logger && logger.info(message)
  // })
  //
  // winstonPapertrail.on('error', (err) => {
  //   logger && logger.error(err)
  // })
}

//async so we can use await
async function test_buffer(i){

	await sleep(7000);
	displayProgress();
	console.log(i);
	logger.info(i);

	return i		;
};

//create an array of length 30
var foo = [];
for (var i = 1; i <= 30; i++) {
   foo.push(i);
}

var bar = foo.map(test_buffer)