node process and cleanup

index.js

// logger - https://gist.github.com/tracker1/655be1ac690d23988816a48d52e91550
import log from './logger';

async function main() {
  // TODO: main processes
}

let cleanedUp = false;
async function cleanup(error) {
  if (error) log.fatal(error);
  
  // only run through cleanup once
  if (cleanedUp) return;
  cleanedUp = true;
  
  try {
    // TODO: cleanup any outstanding resources
  } catch (err) {
    log.fatal(err);
  }

  // nextTick allows for buffered console.log statements to flush
  process.nextTick(() => process.exit(error ? 666 : 0));
}

process.on('unhandledRejection', cleanup);
process.on('uncaughtException', cleanup);
main().then(() => cleanup(), cleanup);