@tremorvideo/blink-cli/src/doctor/latest-blink-cli.js

const updateNotifier = require('update-notifier')

module.exports = (pkg) => {
  return new Promise((resolve, reject) => {
    updateNotifier({
      pkg,
      callback: (err, update) => {
        if (err) reject(err)
        else resolve(update.latest)
      }
    })
  })
}