new Promise resolve()

bluebirdPromise.js

'use strict'

global.Promise = require('bluebird')

let countStream = function () {
  console.log('counting streams..')
  return Promise.resolve(Math.floor(Math.random() * 2))
}

let countInvSync = function () {
  console.log('counting inv syncs..')
  return Promise.resolve(Math.floor(Math.random() * 2))
}

let fnB = function () {
  return new Promise(resolve => {
    countStream().then(strmCount => {
      console.log('stream count:', strmCount)
      if (strmCount === 0) return resolve()
      return Promise.resolve()
    }).then(() => {
      return countInvSync().then(syncCount => {
        console.log('invSync count:', syncCount)
        if (syncCount === 0) return resolve()
        return Promise.resolve()
      })
    }).then(() => {
      console.log('doing core stuff here..')
      return resolve()
    })
  })
}

fnB().then(() => {
  console.log('function fnB() done!')
})