OnClose handler

onClose.js

const events = ['uncaughtException', 'SIGINT', 'SIGTERM', 'SIGQUIT', 'SIGUSR2']

module.exports = function onClose (cb) {
  let called = false
  const handlers = {}
  events.forEach(ev => {
    const handler = (...arg) => {
      if (called) return
      called = true
      cb(ev, ...arg)
    }
    process.once(ev, handler)
    handlers[ev] = handler
  })
  return function offOnClose () {
    for (const ev in handlers) process.removeListener(ev, handlers[ev])
  }
}

package.json

{
  "name": "on-close",
  "version": "0.1.0",
  "main": "onClose.js"
}